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Abbreviations List

It is common in technical writing to abbreviate complex technical terms by combining the first letters. The resulting abbreviations are often called acronyms. Editorial guidelines for the RFC series generally require expansion of these abbreviations on first occurrence in a title, in an abstract, or in the body of the document.

The RFC Editor attempts to keep the use of abbreviations consistent and to point out conflicts to authors. For this purpose, we have built the abbreviation list below. This list contains abbreviations appearing in RFCs and often reflects discussions with authors, WG chairs, and/or ADs. There is no claim of completeness. Note that some abbreviations have multiple expansions.

Some abbreviations are so well known that expansion is probably unnecessary. The RFC Editor exercises editorial judgment about whether a particular use of one of the “well-known” abbreviations requires expansion. (For example, strict adherence to the expansion requirement can lead to impossibly ugly titles.) In the following list of abbreviations, those that are usually (but not necessarily) treated as “well known” are marked with asterisks. However, since there are so many different abbreviations and there is a range of knowledge among RFC readers, we tend to expand abbreviations in case of doubt.

Finally, this list includes some terms that look like abbreviations but are actually fixed names for things, and hence cannot and should not be expanded. These are noted as “No expansion” or “Do not expand”; they are also marked with asterisks.

Note: Names of resource records do not need to be expanded (e.g., NAPTR).

Abbrev * Expansion Notes
2G * Second generation cellular (mobile) (2G)
2.5G * Enhanced second generation cellular (mobile) (2.5G)
3G * Third generation cellular (mobile) (3G)
3GPP * Third Generation Partnership Project
3GPP IMS 3GPP Internet Multimedia System
Third Generation Partnership Project IP Multimedia Subsystem
3PCC third-party call control (3PCC)
4G * 4th Generation Mobile network (mobile) (4G)
4rd IPv4 Residual Deployment (4rd)
5G * 5th Generation Mobile network (mobile) (5G)
6BBR 6LoWPAN Backbone Router (6BBR)
6CIO 6LoWPAN Capability Indication (6CIO)
6CO 6LoWPAN Context Option (6CO)
6LBR 6LoWPAN Border Router (6LBR)
6LN 6LoWPAN Node (6LN)
6LoRH 6LoWPAN Routing Header (6LoRH)
6LoRHC 6LoRH Critical (6LoRHC)
6LoRHE 6LoRH Elective (6LoRHE)
6LoWPAN * IPv6 over Low-Power Wireless Personal Area Networks (6LoWPAN)
6LR 6LoWPAN Router (6LR)
6LSA IPv6 Label Switching Architecture (6LSA)
6P 6TiSCH Operation Sublayer Protocol (6P)
6PE IPv6 Provider Edge (6PE)
6rd IPv6 Rapid Deployment on IPv4 Infrastructures
6TiSCH IPv6 over the TSCH mode of IEEE 802.15.4e (6TiSCH)
6to4-PMT 6to4 Provider Managed Tunnel (6to4-PMT)
6top 6TiSCH Operation Sublayer (6top)
A+P Address plus Port (A+P)
AA Authoritative Answer (AA)
application agent (AA)
AAA Authentication, Authorization, and Accounting (AAA)
AAAA [A DNS record type; not exp.]
AAC Advanced Audio Coding (AAC)
AAD additional authenticated data (AAD)
AAE Active-Active Edge (AAE)
AAH Abandoning All Hope (AAH)
AAK Authenticated Anticipatory Keying (AAK)
AAL5 ATM Adaptation Layer 5 (AAL5)
AAR AA-Request (AAR) RFC 4005
ABE Alternative Backoff with ECN (ABE)
ABFAB Application Bridging for Federated Access Beyond web (ABFAB)
ABI application binary interface (ABI)
ABNF * Augmented Backus-Naur form
ABNO Application-Based Network Operations (ABNO)
ABR Area Border Router (ABR)
ABRO Authoritative Border Router Option (ABRO)
AC Access Controller (AC)
Attachment Circuit (AC)
Access Category (AC)
ACAP Application Configuration Access Protocol
ACE Access Control Entry (ACE)
ASCII Compatible Encoding (ACE)
Authentication and Authorization for Constrained Environments (ACE)
ACH Associated Channel Header
ACK * No expansion
ACL Access Control List (ACL)
ACM access control model (ACM)
ACME Automatic Certificate Management Environment (ACME)
ACP Autonomic Control Plane (ACP)
ACS Auto Configuration Server (ACS)
ACTN Abstraction and Control of TE Networks (ACTN)
AD Authentic Data (bit or flag) (AD)
ADB Application Data Block (ADB)
ADBN Application Data Block Number (ADBN)
ADC analog-to-digital converter (ADC)
ADGoF Anderson-Darling Goodness-of-Fit (ADGoF)
ADISC Address Discovery Extended Link Service (ADISC) Pronounced “ay-disk”.
Adj-RIB * No expansion
ADK Anderson-Darling K-sample (ADK)
ADM Add-Drop Multiplexer (as in SONET ADM)
ADMD ADministrative Management Domain
ADN Authentication Domain Name (ADN)
ADoT Authoritative DoT (ADoT)
ADS Astrophysics Data System (ADS)
ADSL * Asymmetric Digital Subscriber Line (ADSL)
ADSP Author Domain Signing Practices (ADSP)
ADU Application Data Unit (ADU)
ADUI Application Data Unit Information (ADUI)
AEAD Authenticated Encryption with Associated Data (AEAD)
AEC Acoustic Echo Cancellation (AEC)
AERO Asymmetric Extended Route Optimization (AERO)
AES * Advanced Encryption Standard (AES)
AF Assured Forwarding (as in “Diffserv AF”)
Address Family (AF)
Appointed Forwarder (AF)
AFBR Address Family Border Router (AFBR)
AFI * Address Family Identifier (AFI)
AFN Address Family Number
AfriNIC * African Network Information Center
AFRF Authentication Failure Reporting Format (AFRF)
AFS * Authentication File System Typically not expanded.
AFTR Address Family Transition Router (AFTR)
AG Administrative Group (AG)
AGC Automatic Generation Control (AGC)
AGI Attachment Group Identifier
AGN aggregation node (AGN)
AH Authentication Header (AH)
AHS Additional Header Segment (AHS)
Adaptive HTTP Streaming (AHS)
AIA Authority Information Access (AIA)
AIMD Additive Increase Multiplicative Decrease (AIMD)
AIS Alarm Indication Signal (AIS)
AKA Authentication and Key Agreement (AKA)
AMI Advanced Metering Infrastructure (AMI)
AMR Automatic Meter Reading (AMR)
AMT Automatic Multicast Tunneling (AMT)
AKM Authentication and Key Management (AKM)
ALC Asynchronous Layered Coding (ALC)
ALG Application Level Gateway (ALG)
Application Layer Gateway (ALG)
ALOC Area Locator (ALOC)
ALPN Application-Layer Protocol Negotiation (ALPN)
ALT Alternative Logical Topology (ALT)
ALTO Application-Layer Traffic Optimization (ALTO)
AMEI Association of Musical Electronics Industry (AMEI)
AMID Additive Increase Multiplicative Decrease (AMID)
AMR Adaptive Multi-Rate (AMR)
AMR-WB Adaptive Multi-Rate - WideBand (AMR-WB)
AMS authoritative mapping server (AMS)
AMSS Advanced Mobile Station Software (AMSS)
AN Access Node (AN)
ANAT Alternative Network Address Types (ANAT)
ANCP Access Node Control Protocol (ANCP)
ANDSF Access Network Discovery and Selection Function (ANDSF)
ANE Abstract Network Element (ANE)
ANG Access Network Gateway (ANG)
ANI Access Network Identifier (ANI)
Autonomic Networking Infrastructure (ANI) RFC 8994
ANM Authentic Neighbours Memory (ANM)
Adaptive Network Management (ANM)
ANR Access Network Router (ANR)
ANSI American National Standards Institute
ANSN Advertised Neighbor Sequence Number (ANSN)
AODV Ad hoc On-Demand Distance Vector (AODV)
AOR address of record (AOR)
AP Access Point (AP)
Authenticating Party (AP)
API * Application Programming Interface
APM Application Performance Measurement (APM)
APN Access Point Name (APN)
APNIC * Asia Pacific Network Information Centre
APP Application-specific functions
APS Automatic Protection Switching (APS)
AQM Active Queue Management (AQM)
AR Address Resolution (AR)
Access Router (AR)
Assisted Replication (AR)
ARAP Apple Remote Access Protocol (ARAP)
ARF Abuse Reporting Format (ARF)
ARIN * American Registry for Internet Numbers
ARL Authority Revocation List (ARL)
ARM * [formerly for Advanced RISC Machine]
ARMv4 * Advanced RISC Machine version 4
ARO Access Router Option (ARO)
Address Registration Option (ARO)
ARP * Address Resolution Protocol (ARP)
ARQ Automatic Repeat reQuest
AS Autonomous System (AS)
Applicability Statement (AS)
Authentication Service (AS)
Application Specific (AS)
Application Server (AS)
Authorization Server (AS)
ASA Autonomic Service Agent (ASA)
ASBR * Autonomous System Border Router
ASCII * American Standard Code for Information Interchange
ASE Autonomous System External (ASE)
amplifier spontaneous emission (ASE)
ASIC Application-Specific Integrated Circuit (ASIC)
ASLA Application-Specific Link Attribute (ASLA)
ASM * Any-Source Multicast (ASM)
address-sharing mechanism (ASM)
ASN Access Service Network (ASN)
Autonomous System Number (ASN)
ASN.1 * Abstract Syntax Notation One
ASNGW Access Service Network Gateway (ASNGW)
ASON Automatically Switched Optical Network
ASP Application Service Provider (ASP)
ASR Automatic Speech Recognition (ASR)
ATA Analog Telephone Adaptor (ATA)
ATD Activation Time Delay (ATD)
ATM * Asynchronous Transfer Mode (ATM)
* Automatic Teller Machine (ATM)
ATO arrival time offset (ATO)
ATPS Authorized Third-Party Signatures (ATPS)
ATT Attribute Protocol (ATT)
ATU ADSL Transceiver Unit (ATU)
AU Access Unit (AU)
AUID Agent or User Identifier (AUID)
AVA Attribute Value Assertion (AVA)
AVB Audio Video Bridging (AVB)
AVP attribute-value pair (AVP)
* Audio-Visual Profile (AVP)
AVPF * Audio-Visual Profile with Feedback (AVPF)
AVT Audio/Video Transport
AWG Arrayed Waveguide Grating (AWG)
AXFR Authoritative Transfer not full zone transfer or Asynchronous Full Transfer
B-ISDN Broadband Integrated Services Digital Network (B-ISDN)
B-MAC Backbone MAC (B-MAC)
B-VID Backbone VLAN ID
B-VLAN Backbone VLAN
B2BUA back-to-back user agent (B2BUA)
B4 Basic Bridging BroadBand (B4)
BA Behavior Aggregate (BA)
Block Ack (BA)
BAB Bundle Authentication Block (BAB)
BACP Bandwidth Allocation Control Protocol (BACP)
Bonding Aggregation Control Protocol (BACP)
BAR Block Ack Request (BAR)
BAS Broadband Access Switch (BAS)
building automation system (BAS)
bash Bourne-Again SHell (bash)
BB Bottleneck Bandwidth (BB)
BBF Broadband Forum (BBF)
BC Boundary Clock (BC)
BCB Backbone Core Bridge (BCB)
lock Confidentiality Block (BCB)
BCC Bonding Communication Channel (BCC)
BCD Binary Coded Decimal (BCD)
BCE Bonding Channel Entity (BCE)
BCH * Bose, Ray-Chaudhuri, Hocquenghem Typically not expanded; as in “BCH code”
BCP * Best Current Practice should only be expanded for introductory docs
Bridging Control Protocol (BCP)
BD Broadcast Domain (BD)
BDN Broadcast Domain Name (BDN)
BDP Bandwidth-Delay Product (BDP)
BDS * Buchmann, Dahmen, Schneider name of an algorithm
BE best-effort (BE)
BEB Backbone Edge Bridge (BEB)
BECN Backward Explicit Congestion Notification (BECN)
BEEP Blocks Extensible Exchange Protocol (BEEP)
BEET Bound End-to-End Tunnel (BEET)
BEK bundle encryption key (BEK)
BER * Basic Encoding Rules
bit error rate (BER)
BERT Block-wise Extension for Reliable Transport (BERT)
BEX Base Exchange (BEX)
BFCP Binary Floor Control Protocol (BFCP)
BFD Bidirectional Forwarding Detection (BFD)
BFER Bit-Forwarding Egress Router (BFER)
BFIR Bit-Forwarding Ingress Router (BFIR)
BFR Bit-Forwarding Router (BFR)
BGP * Border Gateway Protocol
BGP ORR BGP Optimal Route Reflection (BGP ORR)
BGP-LS Border Gateway Protocol - Link State
BGPsec Typically not expanded
BHS Basic Header Segment (BHS)
BIA Bump-in-the-API (BIA)
BIB Block Integrity Block (BIB)
BIC-TCP Binary Increase Congestion Control (BIC-TCP)
BIER Bit Index Explicit Replication (BIER)
BIER-TE Tree Engineering for Bit Index Explicit Replication (BIER-TE)
BIFT Bit Index Forwarding Table (BIFT)
BIH Bump-in-the-Host (BIH)
BIND/BIND9 * Berkeley Internet Name Domain (BIND) No expansion
BIOS * Basic Input/Output System
BIRD * BIRD Internet Routing Daemon
BIRT Bit Index Routing Table (BIRT)
BIS Bump-in-the-Stack (BIS)
BITS Building Integrated Timing Supply (BITS)
BLA Bridged Line Appearance (BLA)
BLE Bluetooth Low Energy (BLE)
BM Broadcast and Multicast (BM)
BMI Base MPLS Imposition (BMI)
BMP BGP Monitoring Protocol (BMP)
BMR Basic Mapping Rule (BMR)
BMS Building Management Systems (BMS)
BN Bundle Node (BN)
Boundary Node (BN)
BNC Branch Node Capability (BNC)
BNF * Backus-Naur form
BNG Broadband Network Gateway (BNG)
BOF * Birds of a Feather
BOM Byte Order Mark (BOM)
BOSH Bidirectional-streams Over Synchronous HTTP (BOSH)
BP Bundle Protocol (BP)
bit position (BP)
BPA bundle protocol agent (BPA)
BR Border Router (BR)
BRAS Broadband Remote Access Server (BRAS)
BRDP Border Router Discovery Protocol (BRDP)
BRI Basic Rate Interface (BRI)
BRPC Backward Recursive PCE-Based Computation (BRPC)
BRSKI Bootstrapping Remote Secure Key Infrastructure (BRSKI)
BS Base Station (BS)
BSC Base Station Controller (BSC)
BSD * Do not expand name of operating system; better known by acronym
BSL BitStringLength (BSL)
BSM Bootstrap Message (BSM)
BSO Basic Security Option (BSO)
BSP Bundle Security Protocol (BSP)
BSR Bootstrap Router (BSR)
bSPL Base Special Purpose Label (bSPL)
BSS Business Support Systems (BSS)
Basic Service Set (BSS)
Base Station System (BSS)
BSSID Basic Service Set Identifier (BSSID)
BT Bridge Table (BT)
BTC Bulk Transfer Capacity (BTC)
Bulk Transport Capacity (BTC)
BTLE Bluetooth Low Energy (BTLE)
BTMM Back to My Mac (BTMM)
BTS Base Tranceiver Station (BTS)
BTU Bonding Transmission Unit (BTU)
BUM Broadcast, Unknown Unicast, and Multicast (BUM)
Broadcast, Unknown Unicast, or Multicast (BUM)
BVT Bit-rate Variable Transponder (BVT)
BW Bandwidth (BW)
BWS “bad” whitespace (BWS)
C-DNS Compacted-DNS (C-DNS)
C-MAC customer MAC
C2P customer-to-provider (C2P)
CA certification authority (CA) preferred expansion
certificate authority (CA)
cryptographic authentication (CA)
CAA Certification Authority Authorization (CAA)
CAB Converged Address Book (CAB)
Content After Beacon (CAB)
CAC Connection Admission Control (CAC)
CAdES CMS Advanced Electronic Signatures (CAdES)
CAEK content-authenticated-encryption key (CAEK)
CAID Calculation Algorithm ID (CAID)
CalDAV Calendaring Extensions to WebDAV (CalDAV)
CALIPSO Common Architecture Label IPv6 Security Option (CALIPSO)
CALS Computer-Aided Acquisition and Life-Cycle Support (CALS)
CAM Content Addressable Memory (CAM)
captcha * Do not expand
CAP Candidate Access Point (CAP)
CAPWAP Control and Provisioning of Wireless Access Points (CAPWAP)
CAPEX Capital Expenditure (CAPEX)
CAR Committed Access Rate (CAR)
CARD Candidate Access Router Discovery (CARD)
CAT-iq Cordless Advanced Technology - internet and quality (CAT-iq)
CATNIP Common Architecture for Next Generation Internet Protocol (CATNIP)
CAVE Cellular Authentication and Voice Encryption (CAVE)
CBC Cipher Block Chaining (CBC)
CBC-MAC Cipher Block Chaining Message Authentication Code (CBC-MAC)
CBHE Compressed Bundle Header Encoding (CBHE)
CBID Crypto-Based Identifier (CBID)
CBOR Concise Binary Object Representation (CBOR)
CBQ Class-Based Queuing (CBQ)
CBR Constant Bitrate (CBR)
CC Continuity Check (CC)
CSRC count (CC)
Call Completion (CC)
Call Control (CC)
CC-V Continuity Check and Connectivity Verification (CC-V)
CCA Congestion Control Algorithm (CCA)
CCC CMS Content Constraint (CCC)
CCDR Centralized Control Dynamic Routing (CCDR)
CCE Call-Completion Entity (CCE)
CCID Congestion Control Identifier (CCID)
Content Collection IDentifier (CCID)
CCM Counter with CBC-MAC (CCM)
Codec Control Messages (CCM)
Continuity Check Message (CCM)
CCMP Counter Mode with CBC-MAC Protocol (CCMP)
Centralized Conferencing Manipulation Protocol (CCMP)
CCN Content-Centric Networking (CCN)
CCNL Call Completion on Not Logged-in (CCNL)
CCNR Call Completion on No Reply (CCNR)
CCNx Content-Centric Networking (CCNx)
CCS Change Cipher Spec (CCS)
coded character set (CCS)
ccTLD Country Code Top-Level Domain (ccTLD)
CCV Common Communication Vehicle (CCV)
CCXML Call Control XML (CCXML)
CD Congestion Degree
CDA Compression/Decompression Action (CDA)
CDDL Concise Data Definition Language (CDDL)
CCDR Centralized Control Dynamic Routing (CCDR)
CDF Comma-Delimited Format (CDF)
cumulative distribution function (CDF)
CDH computational Diffie-Hellman (CDH)
CDMA * Code Division Multiple Access
CDMA2000 * No expansion It is a registered trademark of the Telecommunications Industry Association in the US.
CDMF * Commercial Data Masking Facility
CDMI Cloud Data Management Interface (CDMI)
CDN Call-Disconnect-Notify (CDN)
Content Delivery Network (CDN)
Content Distribution Network (CDN)
Chinese Domain Name (CDN)
CDNI Content Distribution Network Interconnection (CDNI)
Content Delivery Network Interconnection (CDNI)
CDP Content Delivery Protocol (CDP)
CRL Distribution Point (CDP)
CDR Call Data Record (CDR)
CDRR Current Data Rate (Receive) (CDRR)
CDRT Current Data Rate (Transmit) (CDRT)
CE Customer Edge (CE)
Control Element (CE)
Congestion Experienced (CE)
CEA Capabilities-Exchange-Answer (CEA)
Consumer Electronics Association (CEA)
CEID Control Element ID (CEID)
CEK content-encryption key (CEK)
CELP Code-Excited Linear Prediction (CELP)
CELT Constrained-Energy Lapped Transform (CELT)
CEMA Connection Establishment for Media Anchoring (CEMA)
CEP Circuit Emulation over Packet (CEP)
CERT * Computer Emergency Response Team (CERT)
CES Circuit Emulation Service (CES)
Core-Edge Separation (CES)
CESoPSN Circuit Emulation Service over Packet Switched Network (CESoPSN)
CFB Cipher FeedBack (CFB)
CFG context-free grammar (CFG)
CFI Canonical Format Indicator (CFI)
CFM Connectivity Fault Management (CFM)
CFWS comments and/or folding white space (CFWS)
CGA Cryptographically Generated Addresses (CGA)
CGI Common Gateway Interface (CGI)
CGN Carrier-Grade NAT (CGN)
CHAP Challenge Handshake Authentication Protocol (CHAP)
CHbH Critical Hop-by-Hop (CHbH)
CHID Channel Identifier (CHID)
CI Channel Initiator (CI)
CI/T CDNI Control interface / Triggers (CI/T)
CIA Confidentiality, Integrity, and Availability (CIA)
CID Carousel Instance Descriptor (CID)
Connection Identifier (CID)
Content Identifier (CID)
Context Identifier (CID)
CIDR Classless Inter-Domain Routing (CIDR)
CIF Common Intermediate Format (CIF)
CIFS Common Internet File System (CIFS)
CIID Carousel Instance IDentifier (CIID)
CIM Common Information Model (CIM)
CIN Client Identification Name (CIN)
CIPID Contact Information in PIDF (CIPID)
CIPSO Common Internet Protocol Security Option (CIPSO)
Commercial IP Security Option (CIPSO)
CIS Cryptographic Interoperability Strategy (CIS)
CISC Complex Instruction Set Computer (or Computing)
CIST Common and Internal Spanning Tree (CIST)
CItE Critical Ingress-to-Egress (CItE)
CL Controlled Load (CL)
CLA convergence-layer adapter (CLA)
CLAS Cooperating Layered Architecture for SDN (CLAS)
CLAT customer-side translator (CLAT)
CLDR Connectionless Data Response (CLDR)
Common Locale Data Repository (CLDR)
CLE Congestion Level Estimate (CLE)
CLEI Common Language Equipment Identifier (CLEI)
CLI command-line interface (CLI)
Call Level Interface (CLI)
Calling Line Identification (CLI)
CLNP Connectionless Network Protocol (CLNP)
Connectionless-mode Network Protocol (CLNP) ISO 8473
CLNS Connectionless Network Service (CLNS)
CLP Cell Loss Priority (CLP) A flag in an ATM cell
CLUE Controlling Multiple Streams for Telepresence (CLUE)
CM connection manager (CM)
CMAC Cipher-Based Message Authentication Code (CMAC)
CMC Certificate Management over CMS (CMC)
CMCC Conference and Media Control Client (CMCC)
CMDB Configuration Management Database (CMDB)
CMP Certificate Management Protocol (CMP)
CMS Cryptographic Message Syntax (CMS)
CMT Coordinated Multicast Trees (CMT)
CMTS cable modem termination system (CMTS)
CN Client Node (CN)
correspondent node (CN)
Common Name (CN)
Comfort Noise (CN)
CNAME * Canonical Name (CNAME)
CNC Customer Network Controller (CNC)
CNF Cache-and-Forward (CNF)
CNG comfort noise generation (CNG)
CNP Checksum Neutrality Preserver (CNP)
CNSA Commercial National Security Algorithm (CNSA)
CoA Care-of Address (CoA)
Change-of-Authorization (CoA)
CoAP Constrained Application Protocol (CoAP)
CO Central Office (CO)
Connection Only (CO)
COM Component Object Module (COM)
COMEDIA Connection-Oriented Media (COMEDIA)
COMSEC Communications Security (COMSEC)
CONS Content distribution Overlay Network Service (CONS)
COPS Common Open Policy Service (COPS)
CoRAP Conditional Random Access Point (CoRAP)
CoRE Constrained RESTful Environments (CoRE)
CORS Cross-Origin Resource Sharing (CORS)
Corba common object request broker architecture (Corba)
CoS Class of Service (CoS)
COSE CBOR Object Signing and Encryption (COSE)
CoT Care-of Test (CoT)
CoTI Care-of Test Init (CoTI)
CP Certificate Policy (CP)
CLUE Participant (CP)
CPA Certification Path Advertisement (CPA)
CPE Customer Premises Equipment (CPE)
CPIM Common Presence and Instant Messaging (CPIM)
Common Profile for Instant Messaging (CPIM)
CPL Call Processing Language (CPL)
CPLD Complex Programmable Logic Device (CPLD)
CPM Converged IP Messaging (CPM)
CPP Common Profile for Presence (CPP)
Connectivity Provisioning Profile (CPP)
CPRI Common Public Radio Interface (CPRI)
CPS Certification Path Solicitation (CPS)
Certification Practices Statement (CPS)
CPU * Central Processing Unit
CR Carriage Return (CR)
Correspondent Router (CR)
Channel Receiver (CR)
CRC Cyclic Redundancy Check (CRC)
CR-LDP Constraint-based Routed LDP (CR-LDP)
CRIME Compression Ratio Info-leak Made Easy (CRIME)
CRIO Core Router-Integrated Overlay (CRIO)
CRISP Cross Registry Internet Service Protocol (CRISP)
CRL Certificate Revocation List (CRL)
CRLF * Carriage-Return Line-Feed ASCII control character sequence
CRM Customer Relationship Management (CRM)
CRMF Certificate Request Message Format (CRMF)
CRS Coordinate Reference System (CRS)
CRT Chinese Remainder Theorem (CRT)
CRUD Create, Read, Update, Delete (CRUD)
CRUDX Create, Read, Update, Delete, eXec (CRUDX)
cRTP compressed RTP (cRTP)
CS Communication Session (CS)
Class Selector (CS)
Content Store (CS)
CSA Configured Security Association (CSA)
CSAIL Computer Science and Artificial Intelligence Laboratory (CSAIL)
CsC Carriers' Carriers (CsC)
CSG Cell Site Gateways (CSG)
CSI Channel State Information (CSI)
CSIRT Computer Security Incident Response Team (CSIRT)
CSK Combined Signing Key (CSK)
CSM Capabilities and Settings Message (CSM)
CSMA/CD Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
CSNP Complete Sequence Number PDU (CSNP)
CSO Cross-Stratum Optimization (CSO)
CSP Content Service Provider (CSP)
Content Security Policy (CSP)
Cloud Service Provider (CSP)
CSPF Constrained Shortest Path First (CSPF)
cSPL Composite Special-Purpose Label (cSPL)
CSPRNG cryptographically secure pseudorandom number generator (CSPRNG)
CSR Certificate Signing Request (CSR)
Clock Synchronization Request (CSR)
control and status registers (CSR)
Customer Service Representative (CSR)
CSRC contributing source (CSRC)
CSRF cross-site request forgery (CSRF)
CSS Cascading Style Sheets (CSS)
Connectivity Specifications Sequence (CSS)
Controlled Slip Seconds (CSS)
Conservative Slow Start (CSS)
CT Certificate Transparency (CT)
Commissioning Tool (CT)
Current Transformer (CT)
CT_IU Common Transport Information Unit (CT_IU)
CTO Congestion Timeout (CTO)
CTM Cellular Text Telephone Modem (CTM)
CTR Counter Mode (CTR)
CTS clear to send (CTS)
Cipher Text Stealing (CTS)
CUG Closed User Group (CUG)
CV Connectivity Verification (CV)
CVEs Common Vulnerabilities and Exposures (CVEs)
CVO Coordination of Video Orientation (CVO)
CW Control Word (CW)
Contention Window (CW)
CWDM Coarse Wavelength Division Multiplexing (CWDM)
cwnd congestion window (cwnd)
d-CW DetNet Control Word (d-CW)
DA Destination Address (DA)
Datamover Architecture (DA) (for iSCSI)
DAC Dynamic Authorization Client (DAC)
Duplicate Address Confirmation (DAC)
Discretionary Access Control (DAC)
digital-to-analog converter (DAC)
Destination Address Compression (DAC)
DAD Duplicate Address Detection (DAD)
DAG Directed Acyclic Graph (DAG)
DAM Destination Address Mode (DAM)
DAMA Demand Assigned Multiple Access (DAMA)
DANE DNS-Based Authentication of Named Entities (DANE)
DAO Destination Advertisement Object (DAO)
DAR dynamic alternate routing (DAR)
Duplicate Address Request (DAR)
DARPA Defense Advanced Research Projects Agency (DARPA)
DASH Dynamic Adaptive Streaming over HTTP (DASH)
synonymous with MPEG-DASH
DASS2 Digital Access Signaling System 2 (DASS2)
DBA Dynamic Bandwidth Allocation (DBA)
DC data center (DC)
delegated credential (DC)
DCA Domain Confidentiality Authority (DCA)
DCB Domain-wide Common Block (DCB)
DCCP Datagram Congestion Control Protocol (DCCP)
dCDN downstream Content Delivery Network (dCDN)
DCE Data Communications Equipment (DCE)
Distributed Computing Environment (DCE)
DCEP Data Channel Establishment Protocol (DCEP)
DCI Data Center Interconnect (DCI)
DCN Data Center Network (DCN)
DCO Destination Cleanup Object (DCO)
DCOM Distributed Component Object Model (DCOM)
DCT Discrete Cosine Transform (DCT)
DD Database Description (DD)
DDDS Dynamic Delegation Discovery System (DDDS)
DDoS * Distributed Denial of Service (DDoS)
DDP Device Discovery Protocol (DDP)
Direct Data Placement Protocol (DDP)
Direct Data Placement (DDP)
DDR Discovery of Designated Resolvers (DDR)
DDT Delegated Database Tree (DDT)
DDUL Dynamic DNS Update Lease (DDUL)
DE Discard Eligible (DE) flag in a Frame Relay frame
Designated Expert (DE)
DECADE DECoupled Application Data Enroute (DECADE)
DECT Digital Enhanced Cordless Telecommunications (DECT) ETSI EN 300175
DEI Drop Eligibility Indicator (DEI)
DELT Dual Ended Loop Test (DELT)
DER * Distinguished Encoding Rules
DES * Data Encryption Standard (DES)
DetNet Deterministic Networking (DetNet)
DF Don't Fragment (DF)
Designated Forwarder (DF)
DetNet Flow (DF)
DFZ Default-Free Zone (DFZ)
DGIWG Defence Geospatial Information Working Group (DGIWG)
DH Diffie-Hellman (DH)
Distant Host (DH)
DHAAD Dynamic Home Agent Address Discovery (DHAAD)
DHCP * Dynamic Host Configuration Protocol (DHCP)
DHCPv6 * Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
DHT Distributed Hash Table (DHT)
DI Datamover Interface (DI)
DID Direct Inward Dialing (DID)
decentralized identifier (DID)
DIFS Distributed Interframe Space (DIFS)
DIO DODAG Information Object (DIO)
DIS DODAG Information Solicitation (DIS)
Designated Intermediate System (DIS)
DIT Directory Information Tree (DIT)
DKIM DomainKeys Identified Mail (DKIM)
DLC Data Link Control (DLC)
DLCI Data Link Connection Identifier (DLCI)
DLEP Dynamic Link Exchange Protocol (DLEP)
DLP Discrete Logarithm Problem (DLP)
Data Loss Prevention (DLP)
DLSw Data Link Switching (DLSw) A forwarding mechanism for the IBM SNA (Systems Network Architecture). It places SNA NPDUs into a TCP connection between two routers, which tunnel them across an IP network.
DLV DNSSEC Lookaside Validation (DLV)
DM Delay Measurement (DM)
Disconnect Message (DM)
DMARC Domain-based Message Authentication, Reporting, and Conformance (DMARC)
DMM Delay Measurement Message (DMM)
Distributed Mobility Management (DMM)
DMR Default Mapping Rule (DMR)
DMS Distribution Management System (DMS)
Directed Multicast Service (DMS)
DMTF Distributed Management Task Force (DMTF)
DN Distinguished Name (DN)
Data Network (DN)
DNA Detecting Network Attachment (DNA)
Domain Name Association (DNA)
DNR Do Not Revert (DNR)
Discovery of Network-designated Resolvers (DNR)
DNS * Domain Name System
DNS-SD DNS-based Service Discovery (DNS-SD)
DNS blacklist
DNSSEC * DNS Security
* DNS Security Extensions
DNT Do Not Track (DNT)
DOCSIS Data-Over-Cable Service Interface Specification (DOCSIS)
DoD Downstream-on-Demand (DoD)
DODAG Destination-Oriented Directed Acyclic Graph (DODAG)
DoH DNS (queries) over HTTPS (DoH)
DOI Domain of Interpretation (DOI)
Digital Object Identifier (DOI)
DOM Document Object Model (DOM)
DoQ DNS over QUIC (DoQ)
DoS * Denial of Service (DoS) different from DOS (operating system)
DoT DNS over TLS (DoT)
DOTS DDoS Open Threat Signaling (DOTS)
DP Data Plane (DP)
distribution point (DP)
DNSSEC Policy (DS)
DPA Destination Preference Attribute
DPI deep packet inspection (DPI)
DPLPMTUD Datagram Packetization Layer PMTU Discovery (DPLPMTUD)
DPNSS Digital Private Network Signaling System (DPNSS)
DPoP Demonstrating Proof of Possession (DPoP)
DPR Disconnect-Peer-Request (DPR)
DPS Distributed Programming System (DPS)
Domain Pseudonym System (DPS)
DNSSEC Practice Statement (DPS)
DR designated router (DR)
DRB Designated RBridge (DRB)
DRBG deterministic random-bit generator (DRBG)
DRC duplicate request cache (DRC)
DRCV Data Receiver (DRCV)
DRIP Drone Remote Identification Protocol (DRIP)
DRO Discovery Reply Object (DRO)
DRR direct response routing (DRR)
DRS DGIWG Registry System (DRS)
DRM Digital Rights Management (DRM)
DS Diffserv (DS)
Differentiated Services (DS)
Delegation Signer (DS)
DS-Lite Dual-Stack Lite (DS-Lite)
DSA * Digital Signature Algorithm (DSA)
DSAA2 DECT Standard Authentication Algorithm #2 (DSAA2)
DSACK Duplicate Selective Acknowledgement (DSACK)
DSAP Destination Service Access Point (DSAP)
DSC DECT Standard Cipher (DSC)
DNS Statistics Collector (DSC)
DSC2 DECT Standard Cipher #2
DSCP Differentiated Services Code Point (DSCP)
DSDL Document Schema Definition Languages (DSDL)
DSE DSA-Specific Entry (DSE)
DSL * Digital Subscriber Line (DSL)
DSLAM Digital Subscriber Line Access Multiplexer (DSLAM)
DSM Demand-Side Management (DSM)
DSN Delivery Status Notification (DSN)
Data Sequence Number (DSN)
DSND Data Sender (DSND)
DSP Digital Signal Processor (DSP)
Digital Signal Processing (DSP)
DSRC Dedicated Short-Range Communication (DSRC)
DSRCS Dedicated Short-Range Communications Services (DSRCS)
DSRK Domain-Specific Root Key (DSRK)
DSRL Document Semantics Renaming Language
DSS Digital Signature Standard (DSS)
Data Sequence Signal (DSS)
DST domain separation tag (DST)
DSUSRK Domain-Specific Usage-Specific Root Keys (DSUSRK)
DT Density Threshold (DT)
DTCP Digital Transmission Content Protection (DTCP)
DTD * Document Type Definition
Deactivation Time Delay (DTD)
DTE Data Terminal Equipment (DTE)
DTIM Delivery Traffic Indication Map (DTIM)
DTLS * Datagram Transport Layer Security (DTLS)
DTMF dual-tone multi-frequency (DTMF)
DTN Delay-Tolerant Networking (DTN)
DTOS Distributed Trusted Operating System (DTOS)
DTS decoding time stamp (DTS)
decode time stamp (DTS)
DTSN Destination Advertisement Trigger Sequence Number (DTSN)
DTX Discontinuous Transmission (DTX)
DUA DASS 2 Extensions (DUA)
DUID DHCP Unique Identifier (DUID)
DUNS Data Universal Numbering System (DUNS)
DUPACK Duplicate Acknowledgment (DUPACK)
DupThresh Duplicate Acknowledgment Threshold (DupThresh)
DUT Device Under Test (DUT)
DVB Digital Video Broadcasting (DVB)
DVB-H Digital Video Broadcasting - Handheld (DVB-H)
DVB-IPDC Digital Video Broadcasting - Internet Protocol Datacast (DBC-IPDC)
DVI * No expansion
DVMRP Distance Vector Multicast Routing Protocol (DVMRP)
DWDM Dense Wavelength Division Multiplexing (DWDM)
E.164 * No expansion Refers to a telephone numbering plan as specified by the ITU-T E.164 specification
E-L1CS Extended Level 1 Circuit Scope (E-L1CS)
E-L1FS Extended Level 1 Flooding Scope (E-L1FS)
E-LAN Bidirectional Logical Connectivity between >2 UNIs (E-LAN)
Ethernet LAN provides multipoint connectivity
E-LINE Ethernet point-to-point connectivity
E-LMI Ethernet Local Management Interface (E-LMI)
E-LSP Explicitly TC-encoded-PSC LSP (E-LSP) expansion in RFC 3270 was updated by RFC 5462
E-UTRAN Evolved Universal Terrestrial Radio Access Network (E-UTRAN)
E-VLAN Ethernet Virtual Private LAN (E-VLAN)
E2E end to end (E2E)
EA Embedded Address (EA)
EAG Extended Administrative Group (EAG)
EAI Email Address Internationalization (EAI)
EAP Extensible Authentication Protocol (EAP)
EAP-AKA EAP Authentication and Key Agreement (EAP-AKA)
EAP-GSPK Extensible Authentication Protocol - Generalized Pre-Shared Key (EAP-GPSK)
EAP-SIM EAP Subscriber Identity Module (EAP-SIM)
EAP-TTLS Extensible Authentication Protocol Tunneled Transport Layer Security (EAP-TTLS)
EARO Extended Address Registration Option (EARO)
EATF Emergency Access Transfer Function (EATF)
EBCDIC * Extended Binary Coded Decimal Interchange Code (EBCDIC)
EBGP External BGP (EBGP)
EBM Equipped Bit Mask (EBM)
EC Elliptic Curve (EC)
Extended Communities (EC)
Exchange Complete (EC)
EC2N Elliptic Curve Group over GF[2^N] as in EC2N group
ECA Event-Condition-Action (ECA)
ECAM European Committee for Academic Middleware (ECAM)
ECC Elliptic Curve Cryptography (ECC)
ECC CDH Elliptic Curve Cryptography Cofactor Diffie-Hellman (ECC CDH)
ECCSI Elliptic Curve-Based Certificateless Signatures for Identity-Based Encryption (ECCSI)
ECDH Elliptic Curve Diffie-Hellman
ECDHE Ephemeral Elliptic Curve Diffie-Hellman (ECDHE)
ECDSA Elliptic Curve Digital Signature Algorithm (ECDSA)
ECE Explicit Congestion Notification-Echo / ECN-Echo (ECE)
ECM Error Correction Mode (ECM)
Encapsulated Control Message (ECM)
ECMP * Equal-Cost Multipath (ECMP)
ECMQV Elliptic Curve Menezes-Qu-Vanstone (ECMQV)
ECN Explicit Congestion Notification (ECN)
ECP Elliptic Curve Group over GF[P] as in ECP group
Electronic CodeBook (ECP)
Encryption Control Protocol (ECP)
eCPRI enhanced CPRI (eCPRI)
ECRTP Enhanced Compressed RTP (ECRTP)
ECS EDNS Client Subnet (ECS)
ECT ECN-Capable Transport (ECT)
Encapsulating Content Type (ECT)
ECVRF Elliptic Curve Verifiable Random Function (ECVRF)
EDAC Extended Duplicate Address Confirmation (EDAC)
EDAR Extended Duplicate Address Request (EDAR)
EDCA Enhanced Distributed Channel Access (EDCA)
EdDSA Edwards-curve Digital Signature Algorithm (EdDSA)
EDF empirical distribution function (EDF)
EDGE Enhanced Data rates for GSM Evolution (EDGE)
EDI Electronic Data Interchange (EDI)
EDIINT Electronic Data Interchange - Internet Integration (EDIINT) WG name
EDN Extended Diagnostic Notation (EDN)
EDNS(0) Extension Mechanisms for DNS (EDNS(0))
EDNS0 Extension Mechanisms for DNS (EDNS0)
EE End Entity (EE)
EENA European Emergency Number Association (EENA)
EF Expedited Forwarding as in “Diffserv EF”
EFCI Explicit Forward Congestion Indication (EFCI)
EFM Ethernet First Mile (EFM)
EFR Enhanced Full Rate (EFR)
EGP * Exterior Gateway Protocol
EH Extension Header (EH)
EHLO * Extended Hello For the template in RFC 5321, “EHLO” is specified a term of art, not an abbreviation.
EHV Extra-High Voltage (EHV)
EID Endpoint Identifier (EID)
Extension Header ID (EID)
EIGRP Enhanced Interior Gateway Routing Protocol (EIGRP) Cisco's
EIP Extended Internet Protocol (EIP)
EISS Extended Internal Sublayer Service (EISS)
EIR Equipment Identity Register (EIR)
EIRP Equivalent Isotropic Radiated Power (EIRP)
Effective Isotropically Radiated Power (EIRP)
EKM Exported Keying Material (EKM)
EKT Encrypted Key Transport (EKT)
EKU extended key usage (EKU)
EL Entropy Label (EL)
ELF Executable and Linkable Format (ELF)
ELI Entropy Label Indicator (ELI)
ELOC Endpoint Locator (ELOC)
EMA External Measurement Agent (EMA)
eMBB enhanced Mobile Broadband (eMBB)
eMMC embedded Multimedia Chip (eMMC)
EMS Energy Management Systems (EMS) as in Smart Grid
Element Management System (EMS
EMSK Extended Master Session Key (EMSK)
eNB Evolved Node B (eNB)
ENT Empty Non-Terminal (ENT)
ENUM * No expansion Refers generally to a telephone numbering plan. However, the term ENUM is universal, whereas Telephone Number Mapping is not. There are ENUM activities and organizations all over the world. The “long name” of the ENUM WG is the anomaly, because ENUM is not an abbreviation, despite appearances.
EOF * End of File (EOF)
EOF Extended Options and Flags (EOF)
EoR End-of-Row (EoR)
EOR * exclusive or In logical operations, the exclusive disjunction, also called exclusive or, (symbolized XOR or EOR), is a type of logical disjunction on two operands that results in a value of “true” if and only if exactly one of the operands has a value of “true.” (Wikipedia)
End of Rib (EoR)
EPA Explicit Path Attribute (EPA)
EPC Electronic Product Code (EPC)
Evolved Packet Core (EPC)
EPD Endpoint Discriminator (EPD)
EtherType Protocol Discrimination (EPD)
EPI Educational Policy Institute (EPI)
EPL Ethernet Private Line (EPL)
EPON Ethernet Passive Optical Network (EPON)
EPP Extensible Provisioning Protocol (EPP)
EPS Evolved Packet System (EPS)
EPUB * electronic publication (EPUB)
ER EAP Re-authentication (ER)
Explicit Route (ER)
ERE Extended Regular Expressions (ERE)
ERLD Entropy Readable Label Depth (ERLD)
ERO Explicit Route Object (ERO)
ERP EAP Re-authentication Protocol (ERP)
Enterprise Resource Provision (ERP)
Enterprise Resource Planning (ERP)
ERT Expected Residual Time (ERT)
ERU Effective Request URI (ERU)
ERX EAP Re-authentication Extension (ERX)
ES Errored Seconds (ES)
Ethernet Segment (ES)
ES-IS End System to Intermediate System
ESA Effective Security Association (ESA)
ESADI End-Station Address Distribution Information (ESADI)
ESB Extension Security Block (ESB)
ESC Event State Compositor (ESC)
ESI Error Source Identifier (ESI)
Entity Status Inquiry
Encoding Symbol ID
Energy Services Interface (ESI) (Smart Grid)
Ethernet Segment Identifier (ESI)
ESMC Ethernet Synchronization Messaging Channel (ESMC)
ESMTP * Extended Simple Mail Transfer Protocol
ESN Electronic Serial Number (ESN)
Extended Sequence Number Per EID 3615, the N (of ESN) can also be “Numbers”, but the abbreviation should not be plural (i.e., the abbreviation should still be ESN.
ESO Extended Security Option (ESO)
ESP Encapsulating Security Payload (ESP)
eSPL Extended Special-Purpose Label (eSPL)
ESRP Emergency Service Routing Proxy (ESRP)
ESS Extended Service Set (ESS)
Enhanced Security Services (ESS)
EST Enrollment over Secure Transport (EST)
ETag entity-tag (ETag)
ETLD Effective Transport Label-Stack Depth (ETLD)
ETM excess-traffic-marked (ETM)
ETR Egress Tunnel Router (ETR)
ETS Emergency Telecommunications Service (ETS)
ETSI * European Telecommunications Standards Institute (ETSI)
ETX Expected Transmission Count (ETX)
EUI Extended Unique Identifier (EUI)
EUI-64 64-bit Extended Unique Identifier (EUI-64)
EVB Edge Virtual Bridging (EVB)
Edge Virtual Bridge (EVB)
EVDO Evolution-Data Optimized (EVDO)
EVI EVPN Instance (EVI)
EVPL Ethernet Virtual Private Line (EVPL)
EVPN * Ethernet VPN (EVPN)
EVRC Enhanced Variable Rate CODEC (EVRC)
EVRC-NW Enhanced Variable Rate Narrowband-Wideband Codec (EVRC-NW)
EVS Extended-Vendor-Specific (EVS)
eVTOL electric vertical take-off and landing (eVTOL)
EWMA exponentially weighted moving average (EWMA)
EXI Efficient XML Interchange (EXI)
F-BM Forwarding Bit Mask (F-BM)
FA forwarding adjacency (FA)
Foreign Agent (FA)
FAD feature and attribute data (FAD)
FAN ELS Fabric Address Notification Extended Link Service (FAN ELS) Pronounced “fan ee el es”.
FARP Fibre Channel Address Resolution Protocol (FARP) Pronounced “farp”.
FAT flow-aware transport (FAT)
FBL Feedback Loop (FBL)
FCAG Frequency Control Automatic Generation (FCAG)
FCAPS Fault, Configuration, Accounting, Performance, and Security (FCAPS)
FCC Floor Control Chair (FCC)
File Carbon Copy (FCC)
FCFS First come, first served (FCFS)
FCI Feedback Control Information (FCI)
Footprint & Capabilities Advertisement interface (FCI)
FCIP Fibre Channel Over TCP/IP (FCIP)
FCP Fibre Channel Protocol (FCP)
Floor Control Participant (FCP)
FCS Frame Check Sequence (FCS)
Floor Control Server
FDB Filtering Database (FDB)
FDH Full Domain Hashing (FDH)
FDDI Fiber Distributed Data Interface (FDDI)
FDMA Frequency-Division Multiplex (FDMA)
FDT File Delivery Table (FDT)
FE Forwarding Element (FE)
FEC Forward Error Correction (FEC)
Forwarding Equivalence Class (FEC) as in MPLS
Forward Erasure Correction (FEC)
FECN Forward Explicit Congestion Notification (FECN)
FedFS Federated File System (FedFS)
FEM Forwarding Element Manager (FEM)
FF Fixed-Filter (FF)
FFC Finite Field Cryptography (FFC)
FFCI FEC Framework Configuration Information (FFCI)
FFD Full Function Device (FFD)
ffs for further study
FFT Fast Fourier Transform (FFT)
FG forest guide (FG)
FGL Fine-Grained Labeling (FGL)
Fine-Grained Labeled (FGL)
Fine-Grained Label (FGL)
FHR First-Hop Router (FHR)
FI Forwarding Indicator (FI)
FIA form interpretation algorithm (FIA) W3C VoiceXML 2.0
FIB * Forwarding Information Base (FIB)
FIFO * First In, First Out
FII Forked Instance Identifier (FII)
FILS Fast Initial Link Setup (FILS)
FIN Not expanded TCP flag bit name; see SYN.
FIPS * Federal Information Processing Standards (FIPS)
FIR Full Intra Request (FIR)
FLAC Free Lossless Audio Codec (FLAC)
FLASK Flux Advanced Security Kernel (FLASK)
FLISR Fault Location, Isolation, and Service Restoration (FLISR)
FLR Frame Loss Ratio (FLR)
FLUTE File Delivery over Unidirectional Transport (FLUTE)
FM forwarding management (FM)
Fault Management (FM)
FMIPv6 Fast Handovers for Mobile IPv6 (FMIPv6)
FMR Forwarding Mapping Rule (FMR)
First Matching Rule (FMR)
FMT feedback message type (FMT)
FNV Fowler/Noll/Vo (FNV)
ForCES Forwarding and Control Element Separation (ForCES)
FP Fixed Part (FP)
FPGA Field-Programmable Gate Array (FPGA)
FPS Frames Per Second (FPS)
FQ Fair Queuing (FQ)
FQDN Fully Qualified Domain Name (FQDN)
FR Frame Relay (FR)
FRAND fair, reasonable, and non-discriminatory (FRAND)
FRER Frame Replication and Elimination for Redundancy (FRER)
FRR Fast Reroute (FRR)
F-RTO Forward RTO-Recovery (F-RTO)
FS-LSP Flooding Scope LSP (FS-LSP)
FSID File System ID (FSID)
FSM Finite State Machine (FSM)
FSPF Fabric Shortest Path First (FSPF)
FSSI FEC-Scheme-Specific Information (FSSI)
FT feedback target (FT)
FTP * File Transfer Protocol
FTTH fiber to the home (FTTH)
FWS folding white space (FWS)
G-ACh Generic Associated Channel (G-ACh)
GAL Generic Associated Channel Label (GAL)
G-ACh Label (GAL)
GAP Generic Access Profile (GAP)
GARP Generic Attribute Registration Protocol (GARP)
Gratuitous ARP (GARP)
GAS Generic Advertisement Service (GAS)
GATT Generic Attribute Profile (GATT)
GbE Gigabit Ethernet (GbE)
GBR Guaranteed Bit Rate (GBR)
GBS Generic Bonding Sub-layer (GBS)
GCKS Group Controller/Key Server (GCKS)
GCM Galois/Counter Mode (GCM)
GCO Global Concurrent Optimization (GCO)
GCR GroupCast with Retries (GCR)
GDOI Group Domain of Interpretation (GDOI)
Geneve Generic Network Virtualization Encapsulation (Geneve)
GERAN GSM/EDGE Radio Access Network (GERAN)
GFP Generic Framing Procedure (GFP)
GGSN Gateway GPRS Support Node (GGSN)
GHC Generic Header Compression (GHC)
GID Group Identifier (GID)
Global Identifier (GID)
GIST General Internet Signaling Transport (GIST)
GLB Global Locator Block (GLO)
GLONASS Global Orbiting Navigation Satellite System (GLONASS)
GLOP * No expansion
GMA Generalized Modulus Algorithm (GMA)
GMAC Galois Message Authentication Code (GMAC)
GMII Gigabit Media Independent Interface (GMII)
GML Geography Markup Language (GML)
GMPLS * Generalized Multiprotocol Label Switching (GMPLS)
GMRP GARP Multicast Registration Protocol (GMRP)
GNAP Grant Negotiation and Authorization Protocol (GNAP)
GNS GNU Name System (GNS)
GNSS Global Navigation Satellite System
GOOSE Generic Object Oriented Substation Events (GOOSE)
GPL General Public License (GPL)
GPMD General-Purpose Media Descriptor (GPMD)
GPRS General Packet Radio Service (GPRS)
General Packet Radio System (GPRS)
GPS *Global Positioning System (GPS)
GPU Graphics Processing Unit (GPU)
GRASP Generic Autonomic Signaling Protocol (GRASP)
GRE *Generic Routing Encapsulation (GRE)
GRUU Globally Routable User Agent URI (GRUU)
GSAKMP Group Secure Association Key Management Protocol (GSAKMP)
GSE Generalized Structure Element (GSE)
GSI Grid Security Infrastructure (GSI)
GSLB Global Server Load Balancing (GSLB)
GSM *Global System for Mobile Communications (GSM)
GSMA Global System for Mobile Communications Association (GSMA)
GSPD Group Security Policy Database (GSPD)
GSPM Generic Secure Password Method (GSPM)
GSS-API Generic Security Service Application Program Interface (GSS-API)
GSTN General Switched Telephone Network (GSTN)
Global Switched Telephone Network (GSTN)
GTK Group Temporal Key (GTK)
gTLD Generic Top-Level Domain (gTLD)
GTP Generic Tunneling Protocol (GTP)
GPRS Tunnelling Protocol (GTP)
GTSM Generalized TTL Security Mechanism (GTSM)
GUA Global Unicast Address (GUA)
GUI *Graphical User Interface (GUI)
GUID Globally Unique Identifier (GUID)
GVRP Generic VLAN Registration Protocol (GVRP)
H-PCE Hierarchical PCE (H-PCE)
H-VPLS Hierarchical Virtual Private LAN Service (H-VPLS)
HA Home Agent (HA)
HAC Home Agent Controller (HAC)
HAS HTTP Adaptive Streaming (HAS)
HBA Host Bus Adapter (HBA)
Host-Based Authentication (HBA)
Hash-Based Addresses (HBA)
HbH Hop-by-Hop (HbH)
HC high capacity (HC)
Header Compression (HC)
HCA Host Channel Adapter (HCA)
HCI Host-Controller Interface (HCI)
HD *High Definition (HD)
HDCP High-bandwidth Digital Content Protection (HDCP)
HDLC High-Level Data Link Control (HDLC)
HELD HTTP-Enabled Location Delivery (HELD)
HET Header Extension Type (HET)
HFC Hybrid Fiber Coaxial (HFC)
HFS+ Hierarchical File System Plus (HFS+)
HG home gateway (HG)
HHIT Hierarchical Host Identity Tags (HHIT)
HI Host Identifier (HI)
Host Identity (HI)
HIP Host Identity Protocol (HIP)
hIPv4 hierarchical IPv4 (hIPv4)
HIT Host Identity Tag (HIT)
HKDF HMAC-based Key Derivation Function (HKDF)
HL Hop Limit (HL)
HLR Home Location Register (HLR)
HMAC Hashed Message Authentication Code (HMAC)
Hash-Based Message Authentication Code (HMAC)
HMI Human-Machine Interface (HMI)
HMIPv6 Hierarchical Mobile IPv6 (HMIPv6)
HNCP Home Networking Control Protocol (HNCP)
HoA Home Address (HoA)
HOBA HTTP Origin-Bound Authentication (HOBA)
HoT Home Test (HoT)
HoTI Home Test Init (HoTI)
HOKEY Handover Keying (HOKEY)
HPC High-Performance Computing (HPC)
HPKE hybrid public key encryption (HPKE)
HPKP HTTP Public Key Pinning (HPKP)
HPTP HTTP-based Peer to Peer (HPTP)
HTTP-based Peer-to-Peer (HPTP)
hSFC Hierarchical Service Function Chaining (hSFC)
HSM Hardware Security Module (HSM)
HSMP Hub and Spoke Multipoint (HSMP)
HSPA High Speed Packet Access (HSPA) No hyphen; it's not our term to define.
HSR High-availability Seamless Redundancy (HSR)
HSS Home Subscriber Server (HSS)
HSTS HTTP Strict Transport Security (HSTS)
HTTP * HyperText Transfer Protocol (HTTP)
HTTPS * Hypertext Transfer Protocol Secure (HTTPS)
HTML * HypterText Markup Language (HTML)
HV High Voltage (HV)
I-CPI Intermediate-Controller Plane Interface (I-CPI)
I-D Internet-Draft (I-D)
I-PMSI Inclusive PMSI (I-PMSI)
I-SID Service Instance Identifier (I-SID) (IEEE)
I2NSF Interface to Network Security Functions (I2NSF)
I2RS Interface to the Routing System (I2RS)
IaaS Infrastructure as a Service (IaaS)
IA Identity Association (IA)
IA-RWA Impairment-Aware Routing and Wavelength Assignment (IA-RWA)
IA_PD Identity Association for Prefix Delegation (IA_PD)
IAB * Internet Architecture Board (IAB) Should only be expanded for introductory docs, e.g., Tao of the IETF, RFC 3160
IACD Interface Adjustment Capability Descriptor (IACD)
IACS Industrial Automation and Control System (IACS)
IAID Identity Association IDentifier (IAID)
IAMM In-line Aware MRB Mode (IAMM)
IANA * Internet Assigned Numbers Authority (IANA) Should only be expanded for introductory docs, e.g., Tao of the IETF, RFC 3160
IAOC IETF Administrative Oversight Committee (IAOC)
IAP Intercept Access Point (IAP)
Internet Access Provider (IAP)
Intermediate Anonymization Process (IAP)
IASA IETF Administrative Support Activity (IASA)
IAX Inter-Asterisk eXchange (IAX)
IBAKE Identity-Based Authenticated Key Exchange (IBAKE)
IBCF Interconnection Border Control Function (IBCF)
IBE Identity-Based Encryption (IBE)
IBGP Internal BGP (IBGP)
ICANN *Internet Corporation for Assigned Names and Numbers (ICANN)
ICC ITU Carrier Code (ICC) as listed on ITU Carrier Codes
ICCP Inter-Chassis Communication Protocol (ICCP)
ICE Interactive Connectivity Establishment (ICE)
ICE PAC Interactive Connectivity Establishment Patiently Awaiting Connectivity (ICE PAC)
ICMP *Internet Control Message Protocol (ICMP)
ICN Initial Counter Nonce (ICN)
Information-Centric Networking (ICN)
ICP Internet Content Provider (ICP)
ICRP Incoming-Call-Reply (ICRP)
ICRQ Incoming-Call-Request (ICRQ)
ICS IMS Centralized Services (ICS)
ICSA International Computer Security Association (ICSA)
ICT Inner Content Type (ICT)
Information and Communications Technology (ICT)
ICV Integrity Check Value (ICV)
IDEA International Data Encryption Algorithm (IDEA)
IDevID Initial Device Identifier (IDevID)
IDN Internationalized Domain Name (IDN)
IDNA Internationalizing Domain Names in Applications (IDNA)
Internationalized Domain Names for Applications (IDNA)
IdP Identity Provider (IdP)
IDR Instantaneous Decoding Refresh (IDR)
IDRP Inter-Domain Routing Protocol (IDRP) ISO/IEC 10747
IDS Intrusion Detection System (IDS)
IDSN Initial Data Sequence Number (IDSN)
IE Information Element (IE)
Internet Explorer (IE)
IEA Ingress Egress Aggregate (IEA)
IEC *International Electrotechnical Commission (IEC)
IED Intelligent Electronic Device (IED)
IEEE *Institute of Electrical & Electronics Engineers (IEEE)
IESG *Internet Engineering Steering Group (IESG) Should only be expanded for introductory docs, e.g., Tao of the IETF, RFC 3160
IETF *Internet Engineering Task Force (IETF) Should only be expanded for introductory docs, e.g., Tao of the IETF, RFC 3160
IETF LLC IETF Administration Limited Liability Company (IETF LLC)
IF intermediate frequency (IF)
iff * if and only if From mathematical logic
IFG Inter-Frame Gap (IFG)
IGD Internet Gateway Device (IGD)
IGMP * Internet Group Management Protocol (IGMP)
IGP * Interior Gateway Protocol (IGP)
IGRP Interior Gateway Routing Protocol precursor of EIGRP
IHL Internet Header Length (IHL)
IID Instance ID (IID)
Interface Identifier (IID)
i.i.d. independent and identically distributed (i.i.d.)
IIF Incoming Interface (IIF)
IIR infinite impulse response (IIR)
IKE Internet Key Exchange Protocol (IKE)
Internet Key Exchange (IKE)
IKEv2 Internet Key Exchange Protocol Version 2 (IKEv2)
IKM input keying material (IKM)
ILM Incoming Label Map (ILM)
ILMI Integrated Local Management Interface (ILMI)
ILNP Identifier-Locator Network Protocol (ILNP)
Interim LNP (ILNP)
ILV Index-Length-Value (ILV)
IMA Inverse Multiplexing for ATM (IMA)
IMAP *Internet Message Access Protocol (IMAP)
IMDN Instant Message Disposition Notification (IMDN)
IMEI International Mobile Equipment Identity (IMEI)
International Mobile station Equipment Identity (IMEI) per 3GPP
IMEISV International Mobile station Equipment Identity and Software Version number (IMEISV)
IMET Inclusive Multicast Ethernet Tag (IMET)
IMG Inter-domain Multicast Gateway (IMG)
iMIP iCalendar Message-Based Interoperability Protocol (iMIP)
IMPP Instant Messaging and Presence Protocol (IMPP)
IMS IP Multimedia Subsystems (IMS)
IMSI International Mobile Subscriber Identity (IMSI)
INCITS INternational Committee for Information Technology Standards (INCITS)
INR Internet Number Resource (INR)
INT In-Band Network Telemetry (INT)
I/O * Input/Output (I/O)
IO information object (IO)
Initialize Only (IO)
IOAM In situ Operations, Administration, and Maintenance (IOAM) RFC 9197
IODEF Incident Object Description Exchange Format (IODEF)
IOI Item of Interest (IOI)
Inter Operator Identifier (IOI)
ION IETF Operational Notes (ION)
IOS *Internetwork Operating System (IOS) as in Cisco IOS
IoT Internet of Things (IoT)
IoTSU Internet of Things Software Update (IoTSU)
IP *Internet Protocol (IP)
IP-OBU IP On-Board Unit (IP-OBU)
IP-RSU IP Road-Side Unit (IP-RSU)
IP-VRF IP Virtual Routing and Forwarding (IP-VRF)
IPBX IP Private Branch Exchange (IPBX)
IPEI International Portable Equipment Identity (IPEI)
IPCP IP Control Protocol (IPCP)
IPDV Inter-Packet Delay Variation (IPDV)
IP Packet Delay Variation (IPDV)
IPFIX IP Flow Information Export (IPFIX)
IPFRR IP Fast Reroute (IPFRR)
IPHC IP Header Compression (IPHC)
IPLS IP-only LAN Service (IPLS)
IPng *IP Next Generation (IPng)
IPoE IP over Ethernet (IPoE)
IPoIB IP over InfiniBand (IPoIB)
IPP Internet Printing Protocol (IPP)
IPPM IP Performance Metrics (IPPM)
IPR *Intellectual Property Rights (IPR)
IPRAN IP Radio Access Network (IPRAN)
IPS Intrusion Prevention System (IPS)
IPsec *IP Security (IPsec)
IPSO IP Security Option (IPSO)
Internet Protocol for Smart Objects (IPSO)
IPSP Internet Protocol Support Profile (IPSP)
IPSS Internet Protocol Support Service (IPSS)
IPTV * No expansion A service that delivers television signals over an RTP/UDP/IP video stream. It is read “IP TV”.
IPv4 *Internet Protocol version 4 (IPv4)
IPv4aaS IPv4-as-a-Service (IPv4aaS)
IPv6 *Internet Protocol version 6 (IPv6)
IPX Internetwork Packet Exchange (IPX)
IP Packet eXchange (IPX)
IPWAVE IP Wireless Access in Vehicular Environments (IPWAVE)
IQN iSCSI Qualified Name (IQN)
IR Initiation and Refresh (IR)
Internet Registry (IR)
Ingress Replication (IR)
IRB Integrated Routing and Bridging (IRB) RFC 8317
IRC Internet Relay Chat (IRC)
IRD Information Resource Directory (IRD)
IRI Internationalized Resource Identifier (IRI)
IRIG Inter-Range Instrumentation Group (IRIG)
IRO Include Route Object (IRO)
IRON Internet Routing Overlay Network (IRON)
IRR Internet Routing Registry (IRR)
IRTF *Internet Research Task Force (IRTF) Should only be expanded for introductory docs, e.g., Tao of the IETF, RFC 3160
IS Information Service (IS)
*Intermediate System (IS)
IS-IS *Intermediate System to Intermediate System (IS-IS) routing protocol
ISAKMP Internet Security Association and Key Management Protocol (ISAKMP)
ISATAP Intra-Site Automatic Tunnel Addressing Protocol (ISATAP)
ISC Internet Systems Consortium (ISC)
ISCD Interface Switching Capability Descriptor
iSCSI Internet Small Computer System Interface (iSCSI)
ISE Independent Submissions Editor (ISE)
ISDN *Integrated Services Digital Network (ISDN)
iSER iSCSI Extensions for RDMA (iSER)
ISI Information Sciences Institute (ISI)
ISID Initiator Session Identifier (ISID)
iSNS Internet Storage Name Service (iSNS)
ISO *International Organization for Standardization (ISO)
ISOC *Internet Society (ISOC)
ISP *Internet Service Provider (ISP)
iSPF incremental Shortest Path First (iSPF)
ISS Internal Sublayer Service (ISS)
ISSN *International Standard Serial Number (ISSN)
ISSU In-Service Software Upgrade (ISSU)
IST Internal Spanning Tree (IST)
iTIP iCalendar Transport-independent Interoperability Protocol (iTIP)
ITN individual taxpayer number (ITN)
ITR Ingress Tunnel Router (ITR)
ITS Intelligent Transport Systems (ITS)
ITT Initiator Task Tag (ITT)
ITU *International Telecommunication Union Note the singular “Telecommunication” per "About ITU" -- not the plural “Telecommunications” that authors often use
ITU-T *ITU Telecommunication standardization sector
IU Information Unit (IU)
IUA ISDN Q.921-User Adaptations Layer (IUA)
IUF Initialize-Update-Finalize (IUF)
IUMM In-line Unaware MRB Mode (IUMM)
IV Initialization Vector (IV)
Impairment Validation (IV)
IVL Independent VLAN Learning (IVL)
IVR Interactive Voice Response (IVR)
IW Initial Window (IW)
IWF Interworking Function (IWF)
IWLAN Interworking Wireless LAN (IWLAN)
IXFR Incremental Zone Transfer (IXFR)
IXP Internet Exchange Point (IXP)
JA Joining Assistant (JA)
JAR JWT Secured Authorization Request (JAR)
JCR JSON Content Rules (JCR)
JID Jabber Identifier (JID) Per guidance, “Jabber ID” preferred.
JMAP JSON Meta Application Protocol (JMAP)
JOSE JSON Object Signing and Encryption (JOSE)
JPEG *Joint Photographic Experts Group (JPEG)
JRD JSON Resource Descriptor (JRD)
JSEP JavaScript Session Establishment Protocol (JSEP)
JSON *JavaScript Object Notation (JSON)
JWA JSON Web Algorithms (JWA)
JWE JSON Web Encryption (JWE)
JWS JSON Web Signature (JWS)
JWT Joint Working Team (JWT)
JSON Web Token (JWT)
JavaScript Object Notation Web Token (JWT)
KAM3 Key Agreement Mechanism 3 (KAM3)
KARP Keying and Authentication for Routing Protocols (KARP)
KCI Key Compromise Impersonation (KCI)
KDA Key Distribution Authority (KDA)
KDC Key Distribution Center (KDC)
KDF Key Derivation Function (KDF)
KE key establishment (KE)
Key Exchange (KE)
KEK key encryption key (or key-encryption key) (KEK)
KEM Key Encapsulation Mechanism
KIM Key Identifier Mode (KIM)
KINK Kerberized Internet Negotiation of Keys (KINK)
KLV Key-Length-Value (KLV)
KMP Key Management Protocol (KMP)
KMS Key Management Service (KMS)
KPAK Key Management Service Public Authentication Key (KPAK)
KPI Key Performance Indicator (KPI)
KPML Key Press Markup Language (KPML)
KSA Key Source Authority (KSA)
KSAK Key Management Service Secret Authentication Key (KSAK)
KSK Key Signing Key (KSK)
KTA Key Trust Anchor (KTA)
L2 Layer 2 (L2)
L2CAP Logical Link Control and Adaptation Protocol (L2CAP)
L2CP Layer 2 Control Protocol (L2CP)
L2F Layer 2 Forwarding (L2F)
L2NM Layer 2 VPN Network Model (L2NM)
L2SM Layer 2 VPN Service Model (L2SM)
L2SS L2-Specific Sublayer (L2SS)
L2TP Layer 2 Tunneling Protocol (L2TP)
L2VPN *Layer 2 Virtual Private Network (L2VPN)
L3 Layer 3 (L3)
L3NM L3VPN Network Model (L3NM)
L3SM L3VPN Service Model (L3SM)
L3VPN *Layer 3 Virtual Private Network (L3VPN)
L-LSP Label-Only-Inferred-PSC LSP (L-LSP)
LAALP Local Active-Active Link Protocol (LAALP)
LAC L2TP Access Concentrator (LAC)
LACNIC *Latin American and Caribbean Internet Addresses Registry (LACNIC)
LACP Link Aggregation Control Protocol (LACP)
LAG Link Aggregation Group (LAG)
LAMP Link Aggregation Marker Protocol (LAMP)
LAN *Local Area Network (LAN)
LATM Low-overhead MPEG-4 Audio Transport Multiplex (LATM)
LBR LLN Border Router (LBR)
LbyR Location-by-Reference (LbyR)
LbyV Location-by-Value (LbyV)
LC Local Controller (LC)
Link Connection (LC)
Line Card (LC)
LCAF LISP Canonical Address Format (LCAF)
LCAS Link Capacity Adjustment Scheme (LCAS)
LCCE Logical Cluster Computing Environment (LCCE)
L2TP Control Connection Endpoint
LCG Linear Congruential Generator (LCG)
LCI Location Configuration Information (LCI)
LCP Location Configuration Protocol (LCP)
large content providers (LCP)
Link Control Protocol (LCP)
LCT Layered Coding Transport (LCT)
LDAP Lightweight Directory Access Protocol (LDAP)
LDH letter-digit-hyphen (LDH)
LDI Link Down Indication (LDI)
LDML Locale Data Markup Language (LDML)
LDN Local Domain Name (LDN)
LDP *Label Distribution Protocol (LDP)
LDPC Low-Density Parity Check (LDPC)
LDR Link Delivery Ratio (LDR)
LDRA Lightweight DHCPv6 Relay Agent (LDRA)
LE Lower Effort (LE)
Low Energy (LE)
LEDBAT Low Extra Delay Background Transport (LEDBAT)
LEC Loss Estimation Counter (LEC)
Local Exchange Carrier (LEC)
LER Label Edge Router (LER)
LF *Line Feed (LF)
LFA Loop-Free Alternate (LFA)
LFB Logical Functional Block (LFB)
Logical Function Block (LFB)
LFE Low Frequency Effects (LFE)
LFIB Label Forwarding Information Base (LFIB)
LFN Long Fat Network (LFN)
Local Fixed Node (LFN)
LFS Label Format Specifier (LFS)
LFSR linear feedback shift register (LFSR)
LGR Label Generation Ruleset (LGR)
LIB Label Information Base (LIB)
LIFO last-in-first-out (LIFO)
LIG LISP Internet Groper (LIG)
LIME Layer-Independent OAM Management in the Multi-Layer Environment (LIME)
LIP Loop Initialization Primitive Sequence (LIP) Pronounced “lip”
LIPA Local IP Access (LIPA)
LIR Local Internet Registry (LIR)
LIS Location Information Server (LIS)
LISP Locator-Identifier Split Protocol (LISP)
Locator/ID Separation Protocol (LISP)
LKH Logical Key Hierarchy (LKH)
LLC Logical Link Control (LLC)
Local Link Connectivities (LLC)
LLC_SAP Logical Link Control Service Access Point (LLC_SAP)
LLC/SNAP Logical Link Control/Subnetwork Access Protocol (LLC/SNAP) Pronounced “el el see snap”
LLCL Local Link Connectivity List (LLCL)
LLDP Link Layer Discovery Protocol (LLDP) (ANSI/TIA-1057)
LLDP-MED Link Layer Discovery Protocol - Media Endpoint Discovery (LLDP-MED)
LLID Logical Link Identifier (LLID)
LLME Lower Layer Management Entity (LLME)
LLMNR Link-Local Multicast Name Resolution (LLMNR)
LLN Low-Power and Lossy Network (LLN)
LLQC Last Listener Query Count (LLQC)
LLQI Last Listener Query Interval (LLQI)
LLQT Last Listener Query Timer (LLQT)
LLS Link-Local Signaling (LLS)
LM Loss Measurement (LM)
location management (LM)
LMA Local Mobility Anchor (LMA)
LMAA Local Mobility Anchor Address (LMAA)
LMAP Large-scale Measurement of Broadband Performance (LMAP)
LMDS Local Multipoint Distribution Service (LMDS)
LMP Link Management Protocol (LMP)
LMQC Last Member Query Count (LMQC)
LMQI Last Member Query Interval (LMQI)
LMQT Last Member Query Timer (LMQT)
LMR Last Matching Rule (LMR)
LMTP Local Mail Transfer Protocol (LMTP)
LNE logical network element (LNE)
LO Leading Only (LO)
LOC loss of continuity (LOC)
Loc-RIB *No expansion
LOPS Loss of Packet Synchronization (LOPS)
LORAN-C Long Range Navigation System Version C (LORAN-C)
LoST Location-to-Service Translation (LoST)
LoWPAN Low-Power Wireless Personal Area Network (LoWPAN)
LPC linear-predictive coding (LPC)
LPM Longest Prefix Match (LPM)
LQI Link Quality Indication (LQI)
LRA Localized Routing Acknowledge (LRA)
Local Registration Authority (LRA)
LRDD Link-based Resource Descriptor Document (LRDD)
LRI Localized Routing Initialization (LRI)
LRM Link Resource Manager (LRM)
LRR Layer Refresh Request (LRR)
LRU Least Recently Used (LRU)
LS Lip Synchronization (LS)
LSA Link State Advertisement (LSA)
LSAP Link Service Access Point (LSAP)
LSB least significant bit (LSB)
Locator-Status-Bit (LSB)
LSC Link State Control (LSC)
Lambda Switch Capable (LSC)
Lambda Switching Capable (LSC)
LSDB Link State Database (LSDB)
LSE Label Stack Entry (LSE)
LSF Line Spectral Frequency (LSF)
LSI Local Scope Identifier (LSI)
LSM Label Switched Multicast (LSM)
LSN Large-Scale NAT (LSN)
LSP Label Switched Path (LSP)
Label Switching Path (LSP) Rarely used
Link State Packet (LSP)
Link State PDU (LSP) (or Link State Protocol Data Unit) Link State PDU whenever referring to IS-IS
Location Service Provider (LSP)
LSPA LSP Attributes (LSPA)
LSPDB Link State PDU Database (LSPDB)
LSR Label Switching Router (LSR)
Loose Source Routing (LSR)
LSRR Loose Source and Record Route (LSRR)
LSU Link State Update (LSU)
LSW Least Significant Word (LSW)
LTE * Long Term Evolution (LTE) No hyphen; not our term to define
LTP Licklider Transmission Protocol (LTP)
Link Termination Point (LTP)
LU Logical Unit (LU)
LUN Logical Unit Number (LUN)
LW-IGMPv3 Lightweight IGMPv3 (LW-IGMPv3)
LW-MLDv2 Lightweight MLDv2 (LW-MLDv2)
lw4o6 Lightweight 4over6 (lw4o6)
LW46 LightWeight 46 (LW46)
lwAFTR Lightweight AFTR (lwAFTR)
lwB4 Lightweight B4 (lwB4)
LwM2M Lightweight Machine-to-Machine (LwM2M)
LWSP linear whitespace (LWSP)
LZ77 Lempel-Ziv (LZ77)
LZQ Lempel-Ziv-Welch (LZQ)
M2M machine-to-machine (M2M)
mAFTR Multicast AFTR (mAFTR)
mB4 Multicast Basic Bridging BroadBand (mB4)
MA Multicast Acquisition (MA)
multiple attachment (MA)
Measurement Agent (MA)
Maintenance Association (MA)
MA/RA Maintenance Agency/Registration Authority (MA/RA)
MAC Media Access Control (MAC)
Medium Access Control (MAC) Media/Medium dependent upon plural/singular.
Message Authentication Code (MAC) Legacy cryptographic terminology
Mandatory Access Control (MAC)
MACE Middleware Architecture Committee for Education (MACE)
MACsec Media Access Control Security (MACsec)
MAE Metropolitan Area Ethernet (MAE)
MAG Mobile Access Gateway (MAG)
MAID Maintenance Association Identifier (MAID)
MAN *Metropolitan Area Network
MANET Mobile Ad Hoc Network (MANET)
MAP Mobility Anchor Point (MAP)
Mobile Application Part (MAP)
MAP-E Mapping of Address and Port with Encapsulation (MAP-E)
MAP-T Mapping of Address and Port using Translation (MAP-T)
MAS Mobile Access Station (MAS)
MASA Manufacturer Authorized Signing Authority (MASA)
MBB Make-Before-Break (MBB)
MBGP Multicast BGP (MBGP)
Multiprotocol BGP (MBGP)
MBMS Multimedia Broadcast/Multicast Service (MBMS)
MBZ Must Be Zero (MBZ)
MC Motion Compensation (MC)
Media Consumer (MC)
MC-LAG Multi-Chassis Link Aggregation (MC-LAG)
MCA Multiple Call Appearance (MCA)
MCC Mobile Country Code (MCC)
Management Communication Channel (MCC)
MCLT Maximum Client Lead Time (MCLT)
MCMS Multimedia Cable Network System (MCNS)
MCS Modulation and Coding Scheme (MCS)
MCU Multipoint Control Unit (MCU)
Microcontroller Unit (MCU)
MD Maintenance Domain (MD)
Metadata (MD)
MD5 *Message Digest 5 Typically not expanded
MDA Mail Delivery Agent (MDA)
MDC Modification Detection Code (MDC)
MDHT Multi-level Distributed Hash Table (MDHT)
MDL maximum datagram lifetime (MDL)
mDNS Multicast DNS (mDNS)
MDNs Message Disposition Notifications (MDNs)
MDRR Maximum Data Rate (Receive) (MDRR)
MDRT Maximum Data Rate (Transmit) (MDRT)
MDS Maximal Separable Distance (MDS)
MetaData Server (MDS)
MDSC Multi-Domain Service Coordinator (MDSC)
MDT Multicast Distribution Tree (MDT)
ME Maintenance Entity (ME)
MED Multi-Exit Discriminator (MED)
MEDIACTRL *Media Server Control (MEDIACTRL)
MEF MEF Forum (MEF) No longer “Metro Ethernet Forum (MEF)”)
MEG Maintenance Entity Group (MEG)
MEID Mobile Equipment Identity (MEID)
MELPe Mixed Excitation Linear Prediction Enhanced (MELPe)
MEP Maintenance Entity Group End Point (MEP)
Maintenance End Point (MEP)
MES Manufacturing Execution System (MES)
MF More Fragments (MF)
MFIB Multicast Forwarding Information Base (MFIB)
MG Media Gateway (MG)
MGC Media Gateway Controller (MGC)
MGCP Media Gateway Control Protocol (MGCP)
MGF mask generation function (MGF)
MGM Multilinear Galois Mode (MGM)
MHAE Mobile-Home Authentication Extension (MHAE)
MHD multihomed device (MHD)
MHN multihomed network (MHN)
MHP Multimedia Home Platform (MHP)
Multi-Homed Prefix (MHP)
MHS Mail Handling Service (MHS)
Message Handling Service (MHS)
Message Handling System (MHS)
MI-PMSI Multidirectional Inclusive PMSI (MI-PMSI)
MIB *Management Information Base (MIB)
MIC Message Integrity Check (MIC)
Message Integrity Code (MIC)
MID Media Identification (MID)
MIDCOM Middlebox Communications (midcom)
MIDI MIDI (Musical Instrument Digital Interface) Typically not expanded. If expanded, make MIDI primary, that is, use “MIDI (Musical Instrument Digital Interface)”, not “Musical Instrument Digital Interface (MIDI)”; per RFC Editor note for RFCs 4695 and 4696
MIF multiple interfaces (MIF)
MIKEY Multimedia Internet KEYing (MIKEY)
MIMD Multiplicative-Increase Multiplicative-Decrease (MIMD)
MIME *Multipurpose Internet Mail Extensions (MIME)
MIMO Multiple Input Multiple Output (MIMO)
MIN Mobile Identification Number (MIN)
MINC multicast inference of network characteristics (MINC)
MINE Minimal Encapsulation in IP (MINE)
MIP Mobile IP (MIP)
Maintenance Entity Group Intermediate Point (MIP)
Maintenance Intermediate Point (MIP)
MIPv6/MIP6 Mobile IPv6 (MIPv6 or MIP6)
MIPS *Million Instructions Per Second (MIPS)
MITM man in the middle (MITM) Typically hyphenated as an adjective before a noun
MKI Master Key Identifier (MKI)
MKT Master Key Tuple (MKT)
ML Metadata Label (ML)
MLA Multiple Call Line Appearance (MLA)
MLD Multicast Listener Discovery (MLD)
MLDv2 Multicast Listener Discovery Version 2 (MLDv2)
mLDP Multipoint LDP (mLDP) Per guidance, intentionally not as in RFC 6388 (mLDP: Multipoint extensions for LDP)
MLDv2 Multicast Listener Discovery Version 2 (MLDv2)
MLE Mesh Link Establishment (MLE)
MLI Message Length Indicator (MLI)
Metadata Label Indicator (MLI)
MLM Mailing List Manager (MLM)
MLPP Multilevel Precedence and Preemption (MLPP)
MLS Multi-Level Secure (MLS)
Multi-Level Security (MLS)
MM Mobility Management (MM)
MMA MIDI Manufacturers Association
MMDEF Malware Metadata Exchange Format (MMDEF)
MME Mobile Management Entity (MME)
Mobility Management Entity (MME)
MMORPG Massively Multiplayer Online Role-Playing Game (MMORPG)
MMRP Multiple MAC Registration Protocol (MMRP)
MMS Multimedia Messaging Service (MMS)
mMTC massive Machine Type Communications (mMTC)
MN Mobile Node (MN)
MN-FA Mobile Node - Foreign Agent (MN-FA)
MNC Mobile Network Code (MNC)
MNG Mobile Network Gateway (MNG)
MO Measurement Object (MO)
MOBIKE IKEv2 Mobility and Multihoming (MOBIKE)
MoCA Multimedia over Coax Alliance (MoCA)
MODP modular exponentiation (MODP) often MODP group
MOP Mode of Operation (MOP)
MOS mean opinion score (MOS)
MOSPF Multicast Extensions to OSPF (MOSPF)
MP Multiprotocol (MP)
Maintenance Point (MP)
Merge Point (MP) Also “MPT” in this list
Media Provider (MP)
MP-BGP Multiprotocol BGP (MP-BGP)
MP2P Multi-Point to Point (MP2P)
MP2PE Multi-Point to Point Emulation (MP2PE)
MP2MP Multipoint-to-Multipoint (MP2MP)
MPA Marker PDU Aligned (MPA) Framing for TCP
MPD Media Presentation Description (MPD)
MPEG *Motion Picture Experts Group (MPEG) Typically not expanded
MPEG-DASH MPEG Dynamic Adaptive Streaming over HTTP (MPEG-DASH) Synonymous with DASH
MPI Minimum Picture Interval (MPI)
Multiprecision Integer (MPI)
Metadata Present Indicator (MPI)
MPL Multicast Protocol for Low-Power and Lossy Networks (MPL)
MPLS *Multiprotocol Label Switching (MPLS) Use “Multiprotocol” wherever “Multi Protocol” or “MultiProtocol” occur (RFC 3031, et al.) NOT “Multiprotocol Label Switched” per EID 7892
MPLS-TE *MPLS Traffic Engineering (MPLS-TE)
MPLS-TP MPLS Transport Profile (MPLS-TP)
MPNTP Multipath Network Time Protocol (MPNTP)
MPPTP Multipath Precision Time Protocol (MPPTP)
MPR multipoint relay (MPR)
MPS Maximum Packet Size (MPS)
MPT Merge Point (MPT)
MQTT Message Queuing Telemetry Transport (MQTT)
MR Mobile Router (MR)
Map Resolver (MR)
MRB Media Resource Broker (MRB)
MRD Multicast Router Discovery (MRD)
MRIB Multicast Routing Information Base (MRIB)
MRRU Maximum Reconstructed Reception Unit (MRRU)
MRT Multi-threaded Routing Toolkit (MRT)
Maximally Redundant Tree (MRT)
MRTG Multi Router Traffic Grapher (MRTG)
MRU Maximum Receive Unit (MRU)
MS Media Server (MS)
Mobile Station (MS)
Message Store (MS)
Manual Switch (MS)
MS-PW Multi-Segment Pseudowire (MS-PW)
MSA Mail Submission Agent (MSA)
Message Submission Agent (MSA)
Mobility Service Authorizer (MSA)
MSB most significant bit (MSB)
MSC Mobile Switching Center (MSC)
MSCML Media Server Control Markup Language (MSCML)
MSD Maximum SID Depth (MSD)
MSDP Multicast Source Discovery Protocol (MSDP)
MSID Media Stream Identifier (MSID)
MSISDN Mobile Station International Subscriber Dial Number (MSISDN)
Mobile Subscriber Integrated Services Digital Network number (MSISDN)
MSL maximum segment lifetime (MSL)
MSM Mobile Station Modem (MSM)
MSML Media Server Markup Language (MSML)
MSN Master Sequence Number (MSN)
MSP Mail Service Provider (MSP)
Mapping Service Provider (MSP)
MSRP Message Session Relay Protocol (MSRP)
MSS Maximum Segment Size (MSS)
Mobile Support Station (MSS)
MSTI Multiple Spanning Tree Instance (MSTI) [802.1q]
MSTP Multiple Spanning Tree Protocol (MSTP)
Mobility Service Transport Protocol (MSTP)
MSW Most Significant Word (MSW)
MT Message Transfer (MT)
Mobile Terminal (MT)
Multiplier (MT)
Multi-Topology (MT)
Mersenne Twister (MT)
MTA Mail Transport Agent (MTA)
Mail Transfer Agent (MTA)
Message Transfer Agent (MTA)
MTTR mean time to repair (MTTR)
MTU *Maximum Transmission Unit (MTU)
MTU-s Multi-Tenant Unit switch (MTU-s)
MU Merging Unit (MU)
MUA Mail User Agent (MUA)
Message User Agent (MUA)
MUC Multi-User Chat (MUC)
MUD Manufacturer Usage Description (MUD)
MV Medium Voltage (MV)
MVPN Multicast VPN (MVPN)
MVRP Multiple VLAN Registration Protocol (MVRP) IEEE 802.1ak
MWI Message-Waiting Indicator (MWI)
MXF Material Exchange Format (MXF)
N-PE Network-facing PE (N-PE)
NA Neighbor Advertisement (NA)
NAA Network Address Authority (NAA)
NACK *Negative ACKnowledgement
NACM NETCONF Access Control Model (NACM)
NADA Network-Assisted Dynamic Adaptation (NADA)
NAI Network Access Identifier (NAI)
NAL Network Abstraction Layer (NAL)
NANPA North American Numbering Plan Administration (NANPA)
NAPT *Network Address Port Translator (NAPT)
*Network Address and Port Translator (NAPT) Can use Translator or Translation; both are fine.
NAPTR *Naming Authority Pointer (NAPTR) Resource Record
NAR New Access Router (NAR)
NAS Network Access Server (NAS)
Network-Attached Storage (NAS)
NASREQ Network Access Server Requirements (NASREQ)
NAT *Network Address Translation (NAT)
*Network Address Translator (NAT)
NAT64 Network Address and Protocol Translation from IPv6 Clients to IPv4 Servers (NAT64) as in RFC 6146, per guidance
NAT64-CGN NAT64 Carrier-Grade NAT (NAT64-CGN)
NAT64-FE NAT64 server Front End (NAT64-FE)
NAT-PMP NAT Port Mapping Protocol (NAT-PMP)
NAT-PT Network Address Translation - Protocol Translation (NAT-PT)
Network Address Translator - Protocol Translator (NAT-PT)
NAT-T Network Address Translation Traversal (NAT-T)
NBMA Non-Broadcast Multi-Access (NBMA)
NC Neighbor Cache (NC)
NC Network Controller (NC)
NCE Network Connection Endpoint (NCE)
Neighbor Cache Entry (NCE)
NCP Network Control Protocol (NCP)
NCR Non-Congestion Robustness (NCR)
NCS Network Control Signaling (NCS)
ND Neighbor Discovery (ND)
NDF Non-Designated Forwarder (NDF)
NDN Named Data Networking (NDN)
NDP Neighbor Discovery Protocol (NDP)
Neighbor Discovery Process (NDP)
NE Network Element (NE)
NEA Network Endpoint Assessment (NEA)
NEMO Network Mobility (NEMO)
NENA National Emergency Number Association (NENA)
NETCONF Network Configuration Protocol (NETCONF) Not typically expanded in titles, but expand in abstract.
NetInf Network of Information (NetInf)
NEWPRED * No expansion Refers to error resilience in MPEG-4 version 2 regarding which frame should be used as the reference for the next prediction.
NF Network Function (NF)
NFC Normalization Form C (NFC) Unicode Normalization Form C
Near Field Communication (NFC)
NFKC Normalization Form KC (NFKC)
NFS *Network File System (NFS)
NFV Network Function Virtualization (NFV)
NFVI NFV Infrastructure (NFVI)
NGN Next Generation Network (NGN)
NGW Network Gateway (NGW)
NHC Next Header Compression (NHC)
NHDP Neighborhood Discovery Protocol (NHDP)
NHLFE Next Hop Label Forwarding Entry (NHLFE)
NI Named Information (NI)
network instance (NI)
NIC Network Interface Card (NIC)
Network Information Center (NIC) as in AfriNIC, APNIC, LACNIC
Network Interface Controller (NIC)
NID Network Interface device (NID)
Network Identifier (NID)
Namespace Identifier (NID)
NIDS Network Intrusion Detection System
NIH Named Information for Humans (NIH)
NIR National Internet Registry (NIR)
NIS Network Information Service (NIS)
NIST *National Institute of Standards and Technology (NIST)
NLM Network Lock Manager (NLM)
NLP nonlinear processing (NLP)
NLPID Network Layer Protocol Identifier (NLPID)
NLRI Network Layer Reachability Information (NLRI)
nMAG new Mobility Access Gateway (nMAG)
NMDA Network Management Datastore Architecture (NMDA)
NME Network Management Entity (NME)
NMP Network Musical Performance (NMP)
NMS Network Management System (NMS)
Network Management Station (NMS)
NNI Network-Network Interface (NNI)
NNTP Network News Transfer Protocol (NNTP)
NOC Network Operations Center (NOC)
NOP No Operation (NOP)
NORM NACK-Oriented Reliable Multicast (NORM)
NOS/OLS Not_Operational Primitive Sequence / Offline Primitive Sequence (NOS/OLS)
NoSQL * No expansion While SQL stands for “Structured Query Language”, there's no definitive expansion for “No”.
NP *nondeterministic polynomial (NP) time
NPDAO No-Path Destination Advertisement Object (NPDAO)
NPT Normal Play Time (NPT)
NPTv6 IPv6-to-IPv6 Network Prefix Translation (NPTv6)
NPU Network Processing Unit (NPU)
NR-LDH Non-Reserved LDH (NR-LDH)
NREN National Research and Education Network (NREN)
NRPN Non-Registered Parameter Numbers (NRPN) The plural is used in MIDI documents
NRS Name Resolution Service (NRS)
NRZ Non-Return-to-Zero (NRZ)
NS * No expansion As in “NS simulator” is network simulator, but should not be expanded.
Neighbor Solicitation (NS)
NSA National Security Agency (NSA)
NSAP Network Service Access Protocol (NSAP)
Network Service Access Point (NSAP)
NSC Network Simulation Cradle (NSC)
NSCP Name Server Control Protocol (NSCP)
NSD * No expansion (was: Name Server Daemon) Per guidance for RFC 7706
NSE Named Signaling Event (NSE)
NSF *National Science Foundation (NSF)
NSH Network Service Header (NSH)
NSI non-service initialized (NSI)
NSID Name Server Identifier (NSID)
NSIS Next Steps in Signaling (NSIS)
NSLP NSIS Signaling Layer Protocol (NSLP)
NSP native service processing (NSP)
Network-Specific Prefix (NSP)
Network Service Provider (NSP)
NSR Non-Stop Routing (NSR)
NSS Namespace Specific String (NSS)
Number of Source Symbols (NSS)
National Security System (NSS)
Name Service Switch (NSS)
NSSA Not-So-Stubby Area (NSSA)
NTFS New Technology File System (NTFS)
NTP *Network Time Protocol (NTP)
NTSC *National Television Standards Committee (NTSC)
NUD Neighbor Unreachability Discovery (NUD)
NUT Network Under Test (NUT)
NVA Network Virtualization Authority (NVA)
NVC Number of Virtual Components (NVC)
NVE Network Virtualization Edge (NVE)
NVFS Network Virtual File System (NVFS)
NVGRE Network Virtualization Using Generic Routing Encapsulation (NVGRE)
NVT Network Virtual Terminal (NVT)
NVO Network Virtualization Overlay (NVO)
NVO3 Network Virtualization over Layer 3 (NVO3)
NVT Network Virtual Terminal (NVT)
NWK Network Layer (NWK)
OA Ordered Aggregate (OA)
OACK Option Acknowledgment (OACK)
OAM Operations, Administration, and Maintenance (OAM) BCP 161, RFC 6291
OASIS Organization for the Advancement of Structured Information Standards (OASIS)
OATC Open Authentication Technology Committee (OATC)
OAuth * No expansion More of a name rather than an abbreviation
O&M OAM and Management (O&M) BCP 161, RFC 6291
OC Ordinary Clock (OC)
OCB * No expansion Was initially an acronym of Offset Codebook but is now the algorithm's full name; see RFC 7253.
OCF Open Connectivity Foundation (OCF)
OCh Optical Channel (OCh)
OCP Objective Code Point (OCP)
OCR optical character recognition (OCR)
OCRP Outgoing-Call-Reply (OCRP)
OCRQ Outgoing-Call-Request (OCRQ)
OCSP Online Certificate Status Protocol (OCSP)
ODU Optical Data Unit (ODU)
ODM Original Device Manufacturer (ODM)
OEM original equipment manufacturer (OEM)
OEO optical-electronic-optical (OEO)
OF Objective Function (OF)
OFB Output FeedBack (OFB)
OFDM Orthogonal Frequency Division Multiplexing (OFDM)
oFIB ordered forwarding information base (oFIB)
OGA ORCHID Generation Algorithm (OGA)
OGC Open Geospatial Consortium (OGC)
OGF Open Grid Forum (OGF)
OID *Object Identifier (OID)
OIF Outgoing Interface (OIF)
OKM Output Keying Material (OKM)
OLS Optical Line System (OLS)
OLSR Optimized Link State Routing (OLSR)
OLT Optical Line Terminal (OLT) Server unit of the EPON
OM Overlay Multicast (OM)
OMA Open Mobile Alliance (OMA)
OMAP Online Multimedia Authorization Protocol (OMAP)
OMP Optical Multi-Point (OMP)
ONC Open Network Computing (ONC)
OOMF Overload Originated Multi-destination Frame (OOMF)
OpenPGP * No expansion
OPES Open Pluggable Edge Services (OPES)
OPEX Operating Expenses (OPEX)
Operational Expenditure (OPEX)
OPML Outline Processor Markup Language (OPML)
OPRF Oblivious Pseudorandom Function (OPRF)
ORCHID Overlay Routable Cryptographic Hash Identifiers (ORCHID)
ORO Option Request Option (ORO)
ORR Optimal Route Reflection (ORR)
ORS OID Resolution Service (ORS)
OS *Operating System (OS)
Outbound Streams (OS)
Opportunisitic Security (OS)
OSCORE Object Security for Constrained RESTful Environments (OSCORE)
OSI * Open Systems Interconnection
OSN Original Sequence Number (OSN)
OSPF * Open Shortest Path First (OSPF) routing protocol
OSRTP Opportunistic Secure Real-time Transport Protocol (OSRTP)
OSS Operational Support System (OSS)
Operations Support System (OSS)
OSSI Open Source Software Institute (OSSI)
OT Operation Technology (OT)
Operational Technology (OT)
OTAF Over-the-Air Functionality (OTAF)
OTASP Over-the-Air Service Provisioning (OTASP)
OTI Object Transmission Information (OTI)
OTN Optical Transport Network (OTN)
organization taxpayer number (OTN)
OTP One-Time Password (OTP)
OTT Over the Top (OTT)
OU Organizational Unit (OU)
OUI Organizationally Unique Identifier (OUI)
OVN Open Virtual Networking (OVN)
OVS Open vSwitch (OVS)
OWAMP One-Way Active Measurement Protocol (OWAMP)
OWD One-Way Delay (OWD)
OWE Opportunistic Wireless Encryption (OWE)
OWS optional whitespace (OWS)
OXC Optical Cross-Connect (OXC)
P Provider (P)
P-GW Packet Data Network Gateway (P-GW)
P-PCE Parent PCE (P-PCE)
P2C provider-to-customer (P2C)
P2MP Point-to-Multipoint (P2MP)
P2C provider-to-customer (P2C)
P2P peer-to-peer (P2P)
point-to-point (P2P)
P2PE Point-to-Point Emulation (P2PE)
P2PSIP Peer-to-Peer SIP (P2PSIP)
P3P Platform for Privacy Preferences (P3P)
PA provider-aggregated (PA)
provider assigned (PA)
Posture Attribute (PA)
PaaS Platform as a Service (PaaS)
PAA PANA Authentication Agent
PaC PANA Client (PaC)
PAC * Proxy Auto-Configuration (PAC) Not typically expanded; e.g., “the PAC file” or “Microsoft PAC”
PPTP Access Concentrator (PAC)
privilege attribute certificate (PAC)
PACE Password Authenticated Connection Establishment (PACE)
PAD Peer Authorization Database (PAD)
principal authentication data (PAD)
PAG Policy Association Group (PAG)
PAI P-Asserted-Identity (PAI)
PAKE password-authenticated key exchange (PAKE)
PAL * Phase Alternation Line
Package Availability List (PAL)
PANA Protocol for Carrying Authentication for Network Access
PAR previous access router (PAR)
Pushed Authorization Request (PAR)
PASSporT Personal Assertion Token (PASSporT)
PAT Port Address Translation (PAT)
Policy Association Type (PAT)
PAWS Protocol to Access White-Space (PAWS) Databases
Protection Against Wrapped Sequences (PAWS)
PB Provider Bridge (PB) IEEE 802.1ad
Posture Broker
PBA Proxy Binding Acknowledgement (PBA)
PBAC Policy-Based Admission Control (PBAC)
PBB Provider Backbone Bridge (PBB) (or Bridging) IEEE 802.1ah
PBBN Provider Backbone Bridged Network
PBKDF Password-Based Key Derivation Function (PBKDF)
PBKDF2 Password-Based Key Derivation Function 2 (PBKDF2)
PBU Proxy Binding Update (PBU)
PBX Private Branch Exchange (PBX)
PC Protocol Controller (PC)
Posture Collector (PC)
PCAP Packet Capture (PCAP)
PCAP-NG PCAP Next Generation (PCAP-NG)
PCB Payload Confidentiality Block (PCB)
Protocol Control Block (PCB)
PCC Path Computation Client (PCC)
Policy and Charging Control (PCC)
PCE * Path Computation Element (PCE)
PCECC PCE as a Central Controller (PCECC)
PCED PCE Discovery (PCED)
PCEP Path Computation Element Communication Protocol (PCEP)
PCIM Policy Core Information Model (PCIM)
PCM * Pulse Code Modulation (PCM) Noun
* Pulse Code Modulated (PCM) Adjective
PCMU * Pulse Coded Modulation Pronounced 'mu-law'. Not typically expanded.
PCN Pre-Congestion Notification
PCO Protocol Configuration Option (PCO)
PCP Port Control Protocol (PCP)
PCR Path Control and Reservation (PCR)
PCRE Perl Compatible Regular Expressions (PCRE)
PCRF Policy and Charging Rule Function (PCRF)
PD Prefix Delegation
PDA * Personal Digital Assistant
PDC * Personal Digital Cellular Mobile phone standard. Similar to CDMA; do not expand
PDF * Portable Document Format (PDF)
PDH Plesiochronous Digital Hierarchy (PDH)
PDM Performance and Diagnostic Metrics (PDM)
PDN Packet Data Network (PDN)
PDN-GW Packet Data Network Gateway (PDN-GW)
PDP Packet Data Protocol (PDP)
PDS Parameter Data Structure (PDS)
PDSN Packet Data Serving Node (PDSN)
PDU * Packet Data Unit
Protocol Data Unit
Power Distribution Unit (PDU)
PDV Packet Delay Variation (PDV)
PE Provider Edge (PE)
PEAP Protected Extensible Authentication Protocol (PEAP)
PEF Packet Elimination Function (PEF)
PEG Parsing Expression Grammar (PEG)
PEM Privacy-Enhanced Mail (PEM)
PEM1 * No expansion PEM-1 is not an abbreviation, it is an acronym, and cannot be expanded
PEN Private Enterprise Number (PEN)
PEP Policy Enforcement Point (PEP)
Performance Enhancing Proxy (PEP)
PER Packed Encoding Rules (PER)
PERA Purdue Enterprise Reference Architecture (PERA)
PERC Private Media in Privacy-Enhanced RTP Conferencing (PERC)
PETR Proxy Egress Tunnel Router (PETR)
PEX Peer Exchange (PEX)
PFL Pruned Flood List (PFL)
PFS Perfect Forward Secrecy (PFS)
PFX Personal inFormation eXchange (PFX)
PGM Pragmatic General Multicast (PGM)
PGP Pretty Good Privacy (PGP)
PGW Packet Data Network Gateway (PGW)
PHB Per-Hop Behavior (PHB)
PHIB Previous Hop Insertion Block (PHIB)
PHOP previous hop (PHOP)
PHP Penultimate Hop Popping (PHP)
PHR Per Hop Reservation (PHR)
PHY Physical Layer (PHY)
PI Provider Independent (PI)
Protocol Instantiation (PI)
protocol interpreter (PI)
Policy Identifier (PI)
PIB Payload Integrity Block (PIB)
PIC Prefix Independent Convergence (PIC) (commonly BCP PIC)
PID Provider-defined Identifier (PID)
Packet ID (PID)
PIDF Presence Information Data Format (PIDF)
PIDF-LO Presence Information Data Format Location Object (PIDF-LO)
PIE Proportional Integral controller Enhanced (PIE)
PII Personally Identifiable Information (PII)
PIM * Protocol Independent Multicast
PIM-DM PIM - Dense Mode (PIM-DM)
PIM-SM PIM - Sparse Mode (PIM-SM)
PIM-SSM * PIM Source-Specific Multicast (PIM-SSM)
PIN * Personal Identification Number (PIN)
PIO Prefix Information Option (PIO)
PIT Pending Interest Table (PIT)
PITM person in the middle (PITM) Typically hyphenated when used as an adjective before a noun
PITR Proxy Ingress Tunnel Router (PITR)
PK public key (PK)
PKCE Proof Key for Code Exchange (PKCE)
PKCS * Public-Key Cryptography Standards (PKCS) Remove the expansion if it refers to series of standards, e.g., PKCS #8
PKG Private Key Generator (PKG)
PKI * Public Key Infrastructure (PKI)
PKINIT Public Key Cryptography for Initial Authentication in Kerberos (PKINIT)
PKIX * Public Key Infrastructure using X.509
PL Protocol Layer (PL)
Packetization Layer (PL)
PLAT provider-side translator (PLAT)
PLC Packet Loss Concealment (PLC)
Policy (Rule) Lifetime Change (PLC)
Power Line Communication (PLC)
Programmable Logic Controller (PLC)
PLCP Physical Layer Convergence Procedure (PLCP)
PLI Picture Loss Indication (PLI)
PLR Point of Local Repair (PLR)
Packet Loss Rate (PLR)
PLMN Public Land-based Mobile Network (PLMN)
PLPMTUD Packetization Layer Path MTU Discovery
PLSP-ID PCEP-specific identifier for the LSP
PM Pervasive Monitoring (PM)
Performance Monitoring (PM)
pMAG previous Mobility Access Gateway (pMAG)
PMC Probability of Missing Commands (PMC)
PMD Physical Medium Dependent (PMD)
PMF Performance Measurement Function (PMF)
PMID Portable MAC Identity (PMID)
PMIPv6 Proxy Mobile IPv6
PMRE Prioritized Matching Rule with Errors (PMRE)
PMRN Prioritized Matching Rule with No Errors (PMRN)
PMS Physical Media Specific (PMS)
PMSI P-Multicast Service Interface (PMSI)
Provider Multicast Service Interface
PMTUD Path MTU Discovery (PMTUD)
PMU Phasor Measurement Unit (PMU)
PNC Provisioning Network Controller (PNC)
PNF Physical Network Function (PNF)
pNFS Parallel NFS (pNFS)
PNG * Portable Network Graphics (PNG)
PNNI Private Network-Network Interface (PNNI)
PNS Push Notification Service (PNS)
PoE Power over Ethernet (PoE)
POF Packet Ordering Function (POF)
POI Purge Originator Identification
PON Passive Optical Network (PON)
POODLE Padding Oracle On Downgraded Legacy Encryption (POODLE)
POP Point of Presence (POP)
Post Office Protocol (POP)
proof of possession (PoP)
Packet over SONET (POS)
POSIX * Portable Operating System Interface (POSIX)
POTS Plain Old Telephone Service
PoW proof of work (PoW)
PP Portable Part (PP)
PPID Payload Protocol Identifier (PPID)
PPP * Point-to-Point Protocol
PPPoA Point-to-Point Protocol over ATM (PPPoA)
PPPoE Point-to-Point Protocol over Ethernet (PPPoE)
PPS Packets Per Second (PPS)
PPSP Peer-to-Peer Streaming Portocol (PPSP)
PPTP Point-to-Point Tunneling Protocol (PPTP)
PR Persistent Reservation (PR)
PRID Push Resource ID (PRID)
PR-SCTP Partially Reliable Stream Control Transmission Protocol (PR-SCTP)
PRA Purported Responsible Address (PRA)
PRACK Provisional Response Acknowledgement (PRACK)
PRC Provisioning Class (PRC)
Partial Route Computation (PRC)
PRE Packet Replication and Elimination (PRE)
PRECIS Preparation, Enforcement, and Comparison of Internationalized Strings (PRECIS)
PREOF Packet Replication, Elimination and Ordering Functions (PREOF)
PRF Pseudorandom Function (PRF)
Packet Replication Function (PRF)
PRL Potential Router List (PRL)
Parameter Request List (PRL)
PRNG Pseudorandom Number Generator (PRNG)
ProAV professional audio and video industry (ProAV)
PRP Parallel Redundancy Protocol (PRP)
pseudorandom permutation (PRP)
PRR Port-Range Router (PRR)
Policy Reserve Rule (PRR)
PRTC Primary Reference Time Clock (PRTC)
PS Parametric Stereo (PS)
Proxy Signature
PSAMP Packet Sampling (PSAMP)
PSAP Public Safety Answering Point (PSAP)
PSC Packet Switch Capable (PSC)
Packet Switching Capable (PSC)
PHB Scheduling Class (PSC)
Protection State Coordination (PSC)
PSD Power Spectral Density (PSD)
PSFB payload-specific feedback message (PSFB)
PSID Port Set Identifier (PSID)
PSK Pre-Shared Key (PSK)
PSKC Portable Symmetric Key Container (PSKC)
PSL Public Suffix List (PSL)
PSN * Public Switched Network
Packet Switched Network
PSNP Partial Sequence Number PDU (PSNP)
Partial Sequence Numbers PDU (PSNP)
Packet Sequence Number (PSN)
PSS Packet-switched Streaming Service (PSS) (3GPP)
Probabilistic Signature Scheme (PSS) As in RSASSA-PSS
PSTN Public Switched Telephone Network (PSTN)
PT payload type (PT)
posture transport
Protection Type (PT)
PTA PMSI Tunnel Attribute (PTA)
PTB Packet Too Big (PTB)
PTI Payload Type Identifier (PTI)
Public Technical Identifier (PTI)
PTK Pairwise Transient Key (PTK)
PTM Packet Transfer Mode (PTM)
Pulse-Time Modulation (PTM)
PTO Probe Timeout (PTO)
PTP Precision Time Protocol (PTP)
PTS presentation time stamp (PTS)
PTSW payload type switch (PTSW)
PtM Point to Multipoint (PtM)
PtP Point to Point (PtP)
PUC Probability of Unwanted Commands (PUC)
PURR Proxy Unique Registration Reference (PURR)
PV Posture Validator (PV)
PVC Permanent Virtual Circuit (PVC)
PvD Provisioning Domain (PvD)
PVP Permanent Virtual Path (PVP)
PVT Public Validation Token (PVT)
PW pseudowire
PW-RED Pseudowire Redundancy (PW-RED)
PWE3 Pseudowire Emulation Edge-to-Edge (PWE3)
QEP query execution plan (QEP)
QNAME * query
QoE Quality of Experience (QoE)
QoP Quality of Protection (QoP)
QoS * Quality of Service (QoS)
QQIC Querier's Query Interval Code (QQIC)
QR Quick Response (QR)
QRV Querier's Robustness Variable (QRV)
QUIC * Not an acronym per the WG
QSIG * No expansion (was: Q-signaling protocol)
R2T request-to-transmit (R2T)
Ready to Transfer (R2T)
R2TSN Ready to Transfer Sequence Number (R2TSN)
RA Router Advertisement (RA)
Router Alert (RA)
Routing Area (RA)
registration authority (RA)
RAA Re-Auth-Answer (RAA)
RACK Recent Acknowledgment
RADIUS * Remote Authentication Dial-In User Service (RADIUS)
RAID Redundant Array of Independent Disks (RAID)
RAL RPL-Aware Leaf (RAL)
RAM * Random-Access Memory
RAMS Rapid Acquisition of Multicast Sessions (RAMS)
RAMS-T RAMS Termination (RAMS-T)
RAN Radio Access Network (RAN)
Regional Access Network (RAN)
RPL-Aware Node (RAN)
RANAP Radio Access Network Application Protocol (RANAP)
RANGER Routing and Addressing in Networks with Global Enterprise Recursion (RANGER)
RAO Router Alert Option (RAO)
RAP Random Access Point (RAP)
RAQMON Real-time Application Quality-of-Service Monitoring (RAQMON)
RAR Re-Auth-Request (RAR)
RATS Remote ATtestation procedureS (RATS)
RBAC Resource-Based Admission Control (RBAC)
RBNF Routing Backus-Naur Form (RBNF)
RBR Realm Border Router (RBR)
Regional Border Router (RBR)
RBridge Routing Bridge (RBridge)
* RBridge Channel Not an abbreviation; is a name of a facility, per guidance.
RC Routing Controller (RC)
RC4 * Rivest Cipher #4 Not common, but no expansion required
RCODE * No expansion
RCS Rich Communication Services (RCS)
RD Route Distinguisher (RD)
Router Discovery (RD)
Recursion Desired (RD)
Resource Directory (RD)
RDAP Registration Data Access Protocol (RDAP)
RDDP Remote Direct Data Placement Protocol (RDDP)
RDE Registry Data Escrow (RDE)
RDF Resource Description Framework (RDF)
RDI Remote Defect Indicator (RDI)
Remote Defect Indication (RDI)
Reverse Defect Indication (RDI)
RDM Replay Detection Method (RDM)
RDMA Remote Direct Memory Access (RDMA)
RDN Relative Distinguished Name (RDN)
Registered Domain Name (RDN)
rDNS reverse DNS (rDNS)
RDNSS Recursive DNS Server (RDNSS)
RDO Route Discovery Option (RDO)
RDoT Recursive DoT (RDoT)
RDP * Reliable Data Protocol (RDP)
RDS Resolution Discovery System (RDS)
RE Redundancy Elimination (RE)
REAP Reachability Protocol (REAP)
RED Random Early Detection (RED)
REE Rich Execution Environment (REE)
RELAX NG * Regular Language for XML Next Generation Do not expand; better known by RELAX NG
RELOAD REsource LOcation And Discovery (RELOAD)
REMB Receiver Estimated Maximum Bitrate (REMB)
REST Representational State Transfer (REST)
RESTCONF * No expansion
RESTful Ideally includes a sentence to define RESTful, e.g., RESTful refers to the Representational State Transfer (REST) architecture.
RF radio frequency (RF)
RFB Remote Framebuffer (RFB)
RFC * Request for Comments
RFD Reduced Function Device (RFD)
Route Flap Damping (RFD)
RFID Radio Frequency Identification (RFID)
RFPI Radio Fixed Part Identity (RFPI)
RGB * red, green, blue
RGP Redemption Grace Period
RGRP Reporting Group (RGRP)
RGRS Reporting Group Reporting Sources (RGRS)
RGW routing gateway (RGW)
RH3 type 3 Routing Header for IPv6 (RH3)
RHO Redirected Header Option (RHO)
RHT Routing Header Type (RHT)
RI Router Information (RI)
CDNI Request Routing Redirection interface (RI)
RIB * Routing Information Base (RIB)
RID Real-time Inter-network Defense (RID)
restriction identifier (RID)
RIG Referral Internet Groper (RIG)
RIID Rendezvous Point Interface ID
RIP * Routing Information Protocol
RIPE NCC * Reseaux IP Europeens Network Coordination Centre
RIPng Routing Information Protocol Next Generation (RIPng)
RIR Regional Internet Registry (RIR)
RISC Reduced Instruction Set Computer (or Computing)
RJRS Recovery Journal Receiver Structure (RJRS)
RJSS Recovery Journal Sending Structure (RJSS)
RKAP Reconfiguration Key Authentication Protocol (RKAP)
RLDRAM Reduced Latency Dynamic Random-Access Memory (RLDRAM)
RLE * Run Length Encoding
RLMI Resource List Meta-Information (RLMI)
RLOC Routing Locator (RLOC)
RLQR Relative Link Quality (Receive) (RLQR)
RLQT Relative Link Quality (Transmit) (RLQT)
RLS Resource List Server (RLS)
RMCAT RTP Media Congestion Avoidance Techniques (RMCAT)
RMON remote (network) monitoring (RMON)
RMS root mean square (RMS)
RMSS Receiver Maximum Segment Size (RMSS)
RMT Reliable Multicast Transport (RMT)
RNC Radio Network Controller (RNC)
Relax NG Compact Notation
RNIC RDMA-enabled Network Interface Controller (RNIC)
RDMA Network Interface Card (RNIC)
ROA Route Origin Authorization (ROA)
ROADM Reconfigurable Optical Add/Drop Multiplexer (ROADM)
ROC Rollover Counter (ROC)
RoCE RDMA over Converged Ethernet (RoCE) Per guidance, pronounced “Rocky”.
RoE Radio over Ethernet (RoE)
ROHC RObust Header Compression (ROHC)
ROLIE Resource-Oriented Lightweight Information Exchange (ROLIE)
ROLL Routing Over Low-Power and Lossy Network (ROLL)
ROM * Read-Only Memory
ROV Route Origin Validation
ROVR Registration Ownership Verifier (ROVR)
RP Rendezvous Point (RP)
Relying Party (RP)
Reply Path (RP)
Routing Processor (RP)
Request Parameters (RP)
Reverse Path (RP)
RPA Rendezvous Point Address (RPA)
RPC * remote procedure call (RPC) Remote Procedure Call protocol
RFC Production Center (RPC)
RPCSEC_GSS * RPC security protocol RPC-over-RDMA Version 1
Remote Direct Memory Access Transport for Remote Procedure Call Version 1 No need to expand if RFC 8166 is referenced
RPF Reverse Path Forwarding (RPF)
RPI RPL Packet Information (RPI)
RPKI Resource Public Key Infrastructure (RPKI)
RPL Routing Protocol for Low-Power and Lossy Networks (RPL)
Rendezvous Point Link (RPL)
RPN Registered Parameter Numbers (RPN) “RPNs” is used in RFC 4695
RPR relay peer routing (RPR)
RPT Rendezvous Point Tree (RPT)
RPSI Reference Picture Selection Indication (RPSI)
RPSL Routing Policy Specification Language (RPSL)
RR Resource Record (RR)
receiver report (RR)
Route Reflector (RR) As used by BGP
RRH Remote Radio Head (RRH)
RRL Response Rate Limiting (RRL)
RRO Record Route Object (RRO)
RRT Return Routability Test (RRT)
RS Retransmission Server (RS)
Router Solicitation (RS)
Resource Server (RS)
Recording Session (RS)
RSA * Rivest, Shamir and Adleman
Routing and Spectrum Assignment (RSA)
RSAES-OAEP RSA Encryption Scheme - Optimal Asymmetric Encryption Padding (RSAES-OAEP)
RSASSA-PSS RSA Probabilistic Signature Scheme (RSASSA-PSS)
RSC Receive Segment Coalescing (RSC)
RPKI Signed Checklist (RSC)
RSE RFC Series Editor (RSE)
RSG Radio Network Controller Site Gateway (RSG)
RSI Receiver Summary Information (RSI)
RSIP Realm Specific IP (RSIP)
RSN Reservation Sequence Number (RSN)
RSOO Relay-Supplied Options option (RSOO)
RSP Rendered Service Path (RSP)
RSS * Rich Site Summary (RSS)
Read Sequence Status Block (RSS)
Received Signal Strength (RSS)
Resident Set Size (RSS)
RSSAC Root Server System Advisory Committee (RSSAC)
RSSI Received Signal Strength Indication (RSSI)
RSTP Rapid Spanning Tree Protocol (RSTP) IEEE 802.1t
RSVP * Resource Reservation Protocol
RSVP-TE * RSVP - Traffic Engineering
RT Route Target (RT)
RTBH Remote Triggered Black Hole (RTBH)
RTCP * RTP Control Protocol (RTCP)
* Real-time Transport Control Protocol (RTCP) Use this if RTP in RTCP needs to be expanded
RTCWEB * Web Real-Time Communication
RTMFP Real-Time Media Flow Protocol (RTMFP)
RTMP Real Time Messaging Protocol (RTMP)
RTO retransmission timeout (RTO)
RTP * Real-time Transport Protocol
RTS request to send (RTS)
RTSP Real-Time Streaming Protocol (RTSP)
RTT * round-trip time
RTX * Retransmission
RUL RPL-Unaware Leaf (RUL)
RVS Rendezvous Server (RVS)
RW Restart Window (RW)
RWA Routing and Wavelength Assignment (RWA)
rwnd receiver window (rwnd)
RWS required whitespace (RWS)
RZ Return-to-Zero (RZ)
S-BFD Seamless Bidirectional Forwarding Detection (S-BFD)
S-BGP Secure Border Gateway Protocol (S-BGP)
S-GW Serving Gateway (S-GW)
S-NAPTR Straightforward-Naming Authority Pointer (S-NAPTR)
S-NH-EC Segmented Next-Hop Extended Community (S-NH-EC)
S-PE Switching Provider Edge (S-PE)
S-PLC supervisory PLC (S-PLC)
S-PMSI Selective PMSI (S-PMSI)
S2L source-to-leaf (S2L)
S46 Softwire46 (S46)
SaaS Software as a Service (SaaS)
Storage as a Service (SaaS)
SA security association (SA)
Source-Active (SA)
Source Address (SA)
Situational Awareness (SA)
SABM Standard Application Identifier Bit Mask (SABM)
SAC Source Address Compression (SAC)
State Advertisement Control (SAC)
SACK selective acknowledgment (SACK)
SACM Security Automation and Continuous Monitoring (SACM)
SACRED Securely Available Credentials (SACRED)
SAD Security Association Database (SAD)
SADR Source Address Dependent Routing (SADR)
SAFI * Subsequent Address Family Identifier (SAFI)
SAI Service Activation Interface (SAI)
SAID Security Association ID Historically (in early drafts) “SAId” was used in MIB object names and also in enumeration values like “Said”; can leave them as is mainly because:
a) NMS vendors and operators are familiar with that syntax for OBJECT names involving SAIDs
b) It is risky to make global replace that could lead to SNMP syntax errors on deployment (e.g., global replace of SAId for SAID)
OK to change in DESCRIPTION Clauses ONLY:
“(SAID)” instead of “(SAId)“
“SAID” instead of “SAId”
SALT Speech Application Language Tags (SALT)
SAM Scalable Adaptive Multicast (SAM)
Source Address Mode (SAM)
SAM2 SCSI Architecture Model - 2 (SAM2)
SAML Security Assertion Markup Language (SAML)
SAN System Area Network (SAN)
Subject Alternative Name (SAN)
SANA Space Assigned Numbers Authority (SANA)
SAOL Structured Audio Orchestra Language (SAOL)
SAP Session Announcement Protocol (SAP)
Service Access Point (SAP)
Serving Access Point (SAP)
Service Attachment Point (SAP)
SAR Segmentation and Reassembly (SAR)
SAS Serial Attached SCSI (SAS)
Sequential Aggregate Signature (SAS)
Short Authentication String (SAS)
SASL Simple Authentication and Security Layer (SASL)
SAToP Structure-Agnostic Time Division Multiplexing over Packet (SAToP)
SAVI Source Address Validation Improvement (SAVI)
SAVP * Secure Audio-Visual Profile (SAVP)
SAVPF * Secure Audio-Visual Profile with Feedback (SAVPF)
SB Source Block (SB)
SBC Session Border Controller (SBC)
SBD Shared Bottleneck Detection (SBD)
Supplementary Broadcast Domain (SBD)
SBE Signaling Path Border Element (SBE)
SBG Session Border Gateway (SBG)
SBM Subnet Bandwidth Manager (SBM)
SBN Source Block Number (SBN)
SBR Spectral Band Replication (SBR)
SC Softwire Concentrator (SC)
Switched Connection (SC)
Simplified Chinese (SC)
SCADA Supervisory Control and Data Acquisition (SCADA)
SCCRP Start-Control-Connection-Reply (SCCRP)
SCCRQ Start-Control-Connection-Request (SCCRQ)
SCHAC Schema for Academia (SCHAC)
SCHC Static Context Header Compression (SCHC)
SCI Structured Cybersecurity Information (SCI)
SCIM System for Cross-domain Identity Management (SCIM)
SCRAM Salted Challenge Response Authentication Mechanism (SCRAM)
SCReAM Self-Clocked Rate Adaptation for Multimedia (SCReAM)
SCS Secure Cookie Sessions (SCS)
SCSI Small Computer System Interface (SCSI)
Switching Capability Specific Information (SCSI)
SCT Sender Current Time (SCT)
Signed Certificate Timestamp (SCT)
SCTP Stream Control Transmission Protocol (SCTP)
SCVP Simple Certificate Validation Protocol (SCVP)
Server-Based Certificate Validation Protocol (SCVP)
S/D Source/Destination (S/D)
SD Standard Definition (SD)
sub-domain (SD)
Signal Degrade (SD)
SD-WAN Software-Defined Wide-Area Network (SD-WAN)
SDAT Simple DNA address table (SDAT)
SDES source description (SDES)
SDH Synchronous Digital Hierarchy (SDH)
SDID Signing Domain Identifier (SDID)
SDK * software development kit
SDN Software-Defined Networking (SDN)
Software-Defined Network (SDN)
SDNV Self-Delimiting Numeric Value (SDNV)
SDO Standards Development Organization (SDO)
SDP Session Description Protocol (SDP)
Service Demarcation Point (SDP)
SDSI Simple Distributed Security Infrastructure (SDSI)
SDU service data unit (SDU)
SEAL Subnetwork Encapsulation and Adaptation Layer (SEAL)
SECG Standards for Efficient Cryptography Group (SECG)
SEI Supplemental Enhancement Information (SEI)
SEND Secure Neighbor Discovery (SEND)
SEP Secure Entry Point (SEP)
SERO Secondary Explicit Route Object (SERO)
SES Severely Errored Seconds (SES)
SESPAKE Security Evaluated Standardized Password Authenticated Key Exchange (SESPAKE)
SF Scheduling Function (SF)
Service Function (SF)
Signal Fail (SF)
SFC Service Function Chaining (SFC)
Service Function Chain (SFC)
SFF Service Function Forwarder (SFF)
SFGMP Source Filtering Group Management Protocol (SFGMP)
SFL Synonymous Flow Label (SFL)
SFMT sub-feedback message type (SFMT)
SFP Service Function Path (SFP)
SFU Selective Forwarding Units (SFU)
SGML Standard Generalized Markup Language (SGML)
SGSN Serving GPRS Support Node (SGSN)
SGW Serving Gateway (SGW)
SHA * Secure Hash Algorithm
SHDSL Single-pair High-speed Digital Subscriber Line (SHDSL)
SHIM Stanza Headers and Internet Metadata (SHIM)
Shim6 * Site Multihoming by IPv6 Intermediation (Shim6)
* Level 3 Multihoming Shim Protocol for IPv6 (Shim6)
Level 3 Multihoming Shim Protocol for IPv6 (Shim6)
SI softwire initiator (SI)
Set Identifier (SI)
Service Index (SI)
SIA Subject Information Access (SIA)
SubjectInfoAccess (SIA) the field
SID Schema Item iDentifier (SID)
segment identifier (SID) From RFC 8402: SID: a segment identifier. Note that the term SID is commonly used in place of the term “Segment”, though this is technically imprecise as it overlooks any necessary translation.
session ID (SID)
server ID (SID)
sender ID (SID)
Silence Descriptor (SID) Per guidance, “Silence Descriptor” or “Silence Insertion Description”. The 3GPP and ETSI definition seems to be the former.
Silence Insertion Descriptor (SID)
SIDR Secure Inter-Domain Routing (SIDR)
SIFS Short Interframe Space (SIFS)
SIIT Stateless IP/ICMP Translation Algorithm (SIIT)
SILK Not an acronym. See usage in RFC 6716
SIMCO Simple Middlebox Configuration (SIMCO)
SIMD single instruction, multiple data (SIMD)
SIMPLE SIP for Instant Messaging and Presence Leveraging Extensions (SIMPLE)
SIP * Session Initiation Protocol
Simple Internet Protocol (SIP)
SIPBRANDY SIP Best-practice Recommendations Against Network Dangers to privacY (SIPBRANDY)
SIPP Simple Internet Protocol plus (SIPP)
SIPREC SIP-Based Media Recording (SIPREC)
SIPS Session Initiation Protocol Secure (SIPS)
SIPTO Selected IP Traffic Offload (SIPTO)
SIR Source Intermediary Recipient (SIR)
Signal-to-Interference Ratio (SIR)
SIV Synthetic Initialization Vector (SIV)
SK secret key (SK)
SKFC Session Key Far Component (SKFC)
SKI Subject Key Identifier (SKI)
SKNC Session Key Near Component (SKNC)
SLA Service Level Agreement (SLA)
SLAAC Stateless Address Autoconfiguration (SLAAC)
SLD Second-Level Domain (SLD)
SLI Set-Link-Info (SLI)
Slice Lost Indication (SLI)
SLLA Source Link-Layer Address (SLLA)
SLLAO Source Link-Layer Address Option (SLLAO)
SLO Service Level Objective (SLO)
SLP Service Location Protocol (SLP)
SLURM Simplified Local Internet Number Resource Management with the RPKI (SLURM)
SM Single Marking (SM)
ShangMi (SM)
SMB Session Management Broker (SMB)
Server Message Block (SMB)
SMDS Switched Multimegabit Data Service (SMDS)
SMET Selective Multicast Ethernet Tag (SMET)
SMF Standard MIDI File (SMF)
S/MIME * Secure/Multipurpose Internet Mail Extensions
SMI Structure of Management Information (SMI)
SMIL Synchronized Multimedia Integration Language (SMIL)
SMIv2 Structure of Management Information Version 2 (SMIv2)
SMP Shared Mesh Protection (SMP)
SMPTE Society of Motion Picture and Television Engineers (SMPTE)
SMR Solicit-Map-Request (SMR)
Shared Mesh Restoration (SMR)
SMS * Short Message Service
SMSS Sender Maximum Segment Size (SMSS)
SMTP * Simple Mail Transfer Protocol
SMUX SNMP Multiplex (SMUX)
SN Sequence Number (SN)
SNA Systems Network Architecture (SNA)
SNACK Selective Negative Acknowledgment (SNACK)
Sequence Number Acknowledgement (SNACK)
SNAP Subnetwork Access Protocol (SNAP)
Simple Notification and Alarm Protocol (SNAP)
SNI Server Name Indication (SNI)
SNIA Storage Networking Industry Association (SNIA)
SNID subnamespace identifier (SNID)
SNMP * Simple Network Management Protocol
SNP Subnetwork Point (SNP)
Sequence Number Packet (SNP)
Sequence Number PDU (SNP)
SNPA Subnetwork Point of Attachment (SNPA)
SNR Signal-to-Noise Ratio (SNR)
Serial Number (SNR)
SNS Social Networking Service (SNS)
SNTP Simple Network Time Protocol (SNTP)
SOA * Start of Authority Resource Record
Source of Authority (SOA)
SOAP * Simple Object Access Protocol But “a Web services messaging protocol; originally the acronym for Simple Object Access Protocol, the term is no longer defined in common use” -IEEE Computer Society “In previous versions of this specification the SOAP name was an acronym. This is no longer the case.” - W3C
SoC System on Chip (SoC)
SOCKS * No expansion Name of protocol
SODP Secure Object Delivery Protocol (SODP)
SOHO Small Office, Home Office (SOHO)
SONET Synchronous Optical Network (SONET)
SOP Start of Packet (SOP)
Same-Origin Policy (SOP)
SP Service Provider (SP)
SPB Shortest Path Bridging (SPB)
SPC Service Provider Code (SPC)
Soft Permanent Connection (SPC)
SPD Security Policy Database (SPD)
SPE Synchronous Payload Envelope (SPE)
SPEKE Simple Password Exponential Key Exchange (SPEKE)
SPF Sender Policy Framework (SPF)
Shortest Path First (SPF) 9/8/08 - SPF should be expanded in most if not all IS-IS documents as “Shortest Path First” rather than “Sender Policy Framework”
SPHINCS * No expansion
SPI Security Parameter Index (SPI)
Service Path Identifier (SPI)
SPICE Secure Protocol for Internet Content Exchange (SPICE)
SPID Service Provider ID (SPID)
SPIT Spam over Internet Telephony (SPIT)
SPKI Simple Public Key Infrastructure (SPKI)
SubjectPublicKeyInfo (SPKI)
Subject Public Key Info (SPKI)
SPKM Simple Public-Key GSS-API Mechanism (SPKM)
SPL Special-Purpose Label (SPL)
SPM Secure Password Method (SPM)
SPME Sub-Path Maintenance Element (SPME)
SPND Secure Proxy Neighbor Discovery (SPND)
SPNEGO Simple and Protected GSS-API Negotiation
SPT shortest path tree (SPT)
SPVC Switched Permanent Virtual Circuit (SPVC)
SQL * Structured Query Language
SR sender report (SR)
Segment Routing (SR)
SR OS Service Router Operating System (SR OS)
SR-VCC Single Radio Voice Call Continuity (SR-VCC)
SRC Session Recording Client (SRC)
SRG Shared Risk Group (SRG)
SRGB Segment Routing Global Block (SRGB)
SRGS Speech Recognition Grammar Specification (SRGS)
SRH Source Routing Header (SRH)
SRLG Shared Risk Link Group (SRLG)
SRP Secure Routing Protocol (SRP)
Secure Remote Password (SRP)
Stateful PCE Request Parameter (SRP)
SRR status report request (SRR)
symmetric recursive routing (SRR)
SRRO Secondary Record Route Object (SRRO)
SRS Session Recording Server (SRS)
SRTCP Secure Real-time Transport Control Protocol (SRTCP)
SRTE Segment Routing Traffic Engineering (SRTE)
SRTP Secure Real-time Transport Protocol (SRTP) “Realtime” also okay
SRTT Smoothed Round-Trip Time (SRTT)
SRV * Service Record (SRV) Resource Record
SS7 Signaling System 7 (SS7)
SS-FSSI Sender-Side FEC-Scheme-Specific Information (SS-FSSI)
SS-PW Single-Segment Pseudowire (SS-PW)
SSAP Source Service Access Point (SSAP)
SSDP Simple Service Discovery Protocol (SSDP)
SSE Server Session End (SSE)
State Signaling Event (SSE)
Server-Sent Event (SSE)
SSH Secure Shell (SSH) May need to add “protocol”; e.g., Secure Shell (SSH) protocol
SSID Service Set Identifier (SSID)
Session ID (SSID)
STAMP Session Identifier (SSID)
SSK Secret Signing Key (SSK)
SSL * Secure Sockets Layer (SSL)
SSL/TLS * Secure Sockets Layer/Transport Layer Security (SSL/TLS)
SSM * source-specific multicast (SSM)
Single-Source Multicast (SSM)
SSN Server Sequence Number (SSN)
subsystem number (SSN)
Stream Sequence Number (SSN)
Station Serial Number (SSN)
SSO Single Sign-On (SSO)
SSON Spectrum-Switched Optical Network (SSON)
SSP scheme-specific part (SSP)
SIP Service Provider (SSP)
SSPI Security Support Provider Interface (SSPI)
SSRC synchronization source (SSRC)
SSRF Server-Side Request Forgery (SSRF)
SSRR Strict Source and Record Route (SSRR)
ssthresh slow start threshold (ssthresh)
SSU Synchronization Supply Unit (SSU)
SSV Shared Secret Value (SSV)
Secret State Verifier (SSV)
ST-PE Source Terminating Provider Edge (ST-PE)
STag Steering Tag (STag)
STAMP Simple Two-way Active Measurement Protocol (STAMP)
STAR Short-Term, Automatically Renewed (STAR)
STB Set-Top Box (STB)
STIR Secure Telephone Identity Revisited (STIR)
STOL Short Take-Off and Landing (STOL)
STP Spanning Tree Protocol (STP)
Secure Transfer Protocol (STP)
STS Synchronous Transport Signal (STS)
Security Token Service (STS)
STUN Session Traversal Utilities for NAT (STUN)
Simple Traversal of the UDP Protocol through NAT (STUN)
SUDN Special-Use Domain Name (SUDN)
SUT System Under Test (SUT)
SVC Switched Virtual Circuit (SVC)
SVCB Service Binding (SVCB)
SVEC Synchronization Vector (SVEC)
SVG * Scalable Vector Graphics (SVG)
SVL Shared VLAN Learning (SVL)
SVN Software Version Number (SVN)
SVT Signature Validation Token (SVT)
SW Session Wide (SW)
SWID Software Identification (SWID)
SWIMA Software Inventory Message and Attributes (SWIMA)
SWS silly window syndrome (SWS)
SYN * No expansion TCP flag bit name. See FIN.
syncE synchronous Ethernet (syncE)
T-MPLS Transport MPLS (T-MPLS)
T-PE Terminating Provider Edge (T-PE)
TA Trust Anchor (TA)
Trusted Application Manager (TAM)
TAC Type Allocation Code (TAC)
TAE Timing Alignment Error (TAE)
TAL Trust Anchor Locator (TAL)
TAMP Trust Anchor Management Protocol (TAMP)
TAPI Telephony Application Programming Interface (TAPI)
Transport API (TAPI)
TC Textual Convention (TC)
Topology Control (TC) message type in RFC 3626
Traffic Class (TC)
Transmission Convergence (TC)
Transparent Clock (TC)
Traditional Chinese (TC)
Truncated (TC)
TCA Target Channel Adapter (TCA)
TCAM Ternary Content-Addressable Memory (TCAM)
TCB Transmission Control Block (TCB)
Trusted Computing Base (TCB)
TCN Topology Change Notification (TCN)
TCP * Transmission Control Protocol
TCP-AO TCP Authentication Option (TCP-AO)
TCPCL TCP(-based) convergence layer (TCPCL)
TDD Telecommunication Device for the Deaf (TDD)
Time-Division Duplex (TDD)
TDIM Time-Division Inverse Multiplexing (TDIM)
TDM Time-Division Multiplexer (TDM)
Time-Division Multiplexing (TDM)
TDMA * Time-Division Multiple Access See also CDMA
Time Division Multiplex (TDMA)
TDMoIP Time-Division Multiplexing over IP (TDMoIP)
TE * Traffic Engineering (TE)
* Traffic Engineered (TE)
TEAP Tunnel Extensible Authentication Protocol (TEAP)
TED Traffic Engineering Database (TED)
TEE Trusted Execution Environment (TEE)
TEEP Trusted Execution Enviornment Provisioning (TEEP)
TEI Terminal Endpoint Identifier (TEI)
TEID Tunnel Endpoint Identifier (TEID)
TEP tunnel endpoint (TEP)
TERENA Trans-European Research and Education Networking Association (TERENA)
TESLA Timed Efficient Stream Loss-Tolerant Authentication (TESLA)
TF transport format (TF)
TF-EMC2 Task Force on European Middleware Coordination and Collaboration (TF-EMC2)
TFC Traffic Flow Confidentiality (TFC)
TFO TCP Fast Open (TFO)
TFRC TCP Friendly Rate Control (TFRC)
TFS Time and Frequency Synchronization (TFS)
TFTP * Trivial File Transfer Protocol
TGS Ticket-Granting Server (TGS)
Ticket-Granting Service (TGS)
TGT Ticket-Granting Ticket (TGT)
THD Total Harmonic Distortion (THD)
TI-LFA Topology Independent Loop-Free Alternate (TI-LFA)
TIAS Transport Independent Application Specific (Maximum) (TIAS)
TIB Tree Information Base (TIB)
TIM Traffic Indication Map (TIM)
TIMIP Terminal Independent Mobile IP (TIMIP)
TIO Transit Information Option (TIO)
TKIP Temporal Key Integrity Protocol (TKIP)
TLD Top-Level Domain (TLD)
tLDP Targeted LDP (tLDP) Per guidance, not “T-LDP” as used in several other RFCs, e.g., RFC 6373
TLLA Target Link-Layer Address (TLLA)
TLLAO Target Link-Layer Address Option (TLLAO)
TLP Tail Loss Probe (TLP)
TLS * Transport Layer Security (TLS)
Transparent LAN Services (TLS)
TLSA * No expansion Resource Record
TLSP TRILL Link State Protocol (TLSP)
TLSTM TLS Transport Model (TLSTM)
TLV * Type-Length-Value Self-describing data
TMCE Traffic-Managed Controlled Environment (TMCE)
TMF Task Management Function (TMF)
TML Transport Mapping Layer
TMMBR Temporary Maximum Media Stream Bit Rate Request (TMMBR)
TMMBN Temporary Maximum Media Stream Bit Rate Notification (TMMBN)
TNC Trusted Network Connect (TNC)
TNCP TRILL Network Control Protocol (TNCP)
TNP TRILL Network Protocol (TNP)
TO Tagged Offset (TO)
ToIP Real-time Text over Internet Protocol (ToIP)
TOE TCP Offload Engine (TOE)
target of evaluation (TOE)
TOFU trust-on-first-use (TOFU)
TOI Transmission Object Identifier (TOI)
ToR Top-of-Rack (ToR)
TOS Type of Service (TOS)
TP termination point (TP)
TPA Trust Provisioning Authority (TPA)
TPGT Target Portal Group Tag (TPGT)
TPDU Transport Protocol Data Unit (TPDU)
TPM Transport Performance Metrics (TPM)
Trusted Platform Module (TPM)
TPS Transport Protocol Specific (TPS)
TPUI Temporary Portable User Identity (TPUI)
TR Tunnel Router (TR)
TRILL Transparent Interconnection of Lots of Links (TRILL)
TS Traffic Selector (TS)
Transport Stream (TS)
Tenant System (TS)
TSA Time Stamping Authority
TSCH Time-Slotted Channel Hopping (TSCH)
TSDM Trusted System Development Methodology (TSDM)
TSecr Timestamp Echo Reply (TSecr)
TSI Transport Session Identifier (TSI)
Tenant System Interface (TSI)
TSM Transport Security Model
TSN Trunk Switched Network (TSN)
Test Support Network (TSN)
Transmission Sequence Number (TSN)
Time-Sensitive Networking (TSN)
TSO TCP Segmentation Offload (TSO)
TSTN Temporal-Spatial Trade-off Notification (TSTN)
TSTR Temporal-Spatial Trade-off Request (TSTR)
TT-PE Target Terminating Provider Edge (TT-PE)
TTD Throughput Test Device (TTD)
TTL * Time to Live
TTP Tunnel Termination Point (TTP)
TTSI Text-To-Speech Interface (TTSI)
TTT Target Transfer Tag (TTT)
TU Time Unit (TU)
transaction user (TU)
TUG Tributary Unit Group (TUG)
TURN Traversal Using Relay NAT (TURN)
Traversal Using Relays around NAT (TURN)
TV Type/Value (TV)
TWAMP Two-Way Active Measurement Protocol (TWAMP)
TX * Transmission
U/L Universal/Local (U/L)
UA User Agent (UA)
Unmanned Aircraft (UA)
Untrusted Application (UA)
UAC User Agent Client (UAC)
UAK User Authentication Key (UAK)
UAL Unused Association Lifetime (UAL)
UAM Universal Access Method (UAM)
UART Universal Asynchronous Receiver Transmitter (UART)
UAS User Agent Server (UAS)
Unavailable Seconds (UAS)
Unmanned Aircraft System (UAS) Used for both singular and plural (i.e., not “UASs”)
uCDN upstream Content Delivery Network (uCDN)
UCMP Unequal-Cost Multipath (UCMP)
UCS Uniform Client ID String (UCS)
Universal Multiple-Octet Coded Character Set (UCS)
Universal Coded Character Set (UCS)
UDA User Defined Application (UDA)
UDABM User-Defined Application Identifier Bit Mask (UDABM)
UDDI Universal Description, Discovery, and Integration (UDDI)
UDP * User Datagram Protocol
UDP-Lite * User Datagram Protocol Lite
UDPTL UDP Transport Layer (UDPTL)
UDRP Uniform Domain-Name Dispute-Resolution Policy (UDRP)
UDVM Universal Data/Voice Multiplexer (UDVM)
UE User Equipment (UE)
UHF * Ultra High Frequency
UHP Ultimate Hop Popping (UHP)
UHR Ultra-High Reliability (UHR)
UI * User Interface
UICC Universal Integrated Circuit Card (UICC)
UID Unique Identifier (UID)
User Identifier (UID)
UKS Unknown Key Source (UKS)
ULA Unique Local Addressing (ULA)
Unique Local Address (ULA)
ULB Upper Layer Binding (ULB)
ULE Ultra Low Energy (ULE)
ULID Upper-Layer Identifier (ULID)
ULL Ultra-Low Latency (ULL)
ULP Unequal Loss Protection (ULP)
Upper-Level Protocol (ULP)
Upper-Layer Protocol (ULP)
UMA Unlicensed Mobile Access (UMA)
UMB Ultra Mobile Broadband (UMB)
UMH Upstream Multicast Hop (UMH)
UML Unified Modeling Language (UML)
UMTS Universal Mobile Telecommunications System (UMTS)
UNC Universal Naming Convention (UNC)
UNI User-Network Interface (UNI)
U-NII Unlicensed National Information Infrastructure (U-NII)
UNSAF UNilateral Self-Address Fixing (UNSAF)
U-PE User-facing PE (U-PE)
UPA Update Notification Acknowledgement (UPA)
UPF User Plane Function (UPF)
UPN Update Notification (UPN)
UPnP Universal Plug and Play (UPnP)
URI * Uniform Resource Identifier
URL * Uniform Resource Locator
URLLC Ultra-Reliable and Low Latency Communications (URLLC)
URN * Uniform Resource Name
uRPF unicast reverse path forwarding (uRPF)
USB * Universal Serial Bus
USC University of Southern California (USC)
US-CERT US Computer Emergency Readiness Team (CERT)
USM User-based Security Model
USRK Usage Specific Root Keys (USRK)
UTC * Coordinated Universal Time
UTF-8 * Unicode transformation format 8
UTI Universal Transport Interface (UTI) Cisco
Uniform Type Identifier (UTI)
UTRAN Universal Terrestrial Radio Access Network (UTRAN)
UUCP Unix-to-Unix Copy (UUCP)
UUI User-to-User Information (UUI)
UUID Universally Unique Identifier (UUID)
V2V vehicle to vehicle (V2V)
V2X vehicle to everything (V2X)
VACM View-based Access Control Model (VACM)
VAD Voice Activity Detection (VAD)
VAP Virtual Access Point (VAP)
VAPID Voluntary Application Server Identification (VAPID)
VBCM Video Back Channel Message (VBCM)
VBD Voiceband Data (VBD)
VBR Vouch By Reference (VBR)
Variable Bitrate (VBR)
VBR-NRT Variable Bit Rate - Non Real Time
VBR-RT Variable Bit Rate - Real Time
VC Virtual Circuit (VC)
vCard * No expansion
VCAT Virtual Concatenation (VCAT)
VCC Virtual Channel Connection (VCC)
VCCV Virtual Circuit Connectivity Verification (VCCV)
VCI Virtual Channel Identifier (VCI)
Virtual Circuit Identifier (VCI)
VDL Valid Data Length (VDL)
VDP Virtual Station Interface (VSI) Discovery and Configuration Protocol (VDP)
VDSL Very high bit-rate Digital Subscriber Line (VDSL)
Very high speed Digital Subscriber Line (VDSL)
VET Virtual Enterprise Traversal (VET)
VHF * Very High Frequency
VI Virtual Interface (VI)
vIP * virtual IP address (vIP)
VL VLAN labeled (VL)
VLAN * Virtual Local Area Network
VLB Valiant Load-Balancing (VLB)
VM Virtual Machine (VM)
VMR Variable Multi Rate (VMR)
VMR-WB Variable Multi Rate WideBand (VMR-WB)
VMS Virtual Memory System (VMS)
VN Virtual Network (VN)
VNC Virtual Network Computing (VNC)
VNF Virtual Network Function (VNF)
VNI VXLAN Network Identifier
Virtual Network Identifier (VNI)
VNTM Virtual Network Topology Manager (VNTM)
VoCN Voice over Cellular Network (VoCN)
VoD Video on Demand (VoD)
VoIP Voice over IP (VoIP)
VoLTE Voice over LTE (VoLTE)
VO Virtual Organization (VO)
VOP Video Object Plane (VOP)
VOPRF Verifiable Oblivious Pseudorandom Function (VOPRF)
VOQ Virtual Output Queueing (VOQ)
VPC Virtual Path Connection (VPC)
VPD Vital Product Data (VPD)
VPI Virtual Path Identifier (VPI)
VPIM Voice Profile for Internet Mail (VPIM)
VPLS Virtual Private LAN Service (VPLS)
VPMS Virtual Private Multicast Service (VPMS)
VPN * Virtual Private Network (VPN)
VPN+ Enhanced VPN (VPN+)
VPWS Virtual Private Wire Service (VPWS)
VR Virtual Reality (VR)
VRF VPN Routing and Forwarding (VRF)
Virtual Routing and Forwarding (VRF)
Verifiable Random Function (VRF)
VRID Virtual Router Identifier (VRID)
VRP VLAN Registration Protocol (VRP)
Versatile Routing Platform (VRP)
VRRP Virtual Router Redundancy Protocol (VRRP)
VSA Vendor-Specific Attribute (VSA)
VSI Virtual Switch Instance (VSI)
Virtual Station Interface (VSI)
VSID Virtual Subnet Identifier (VSID)
Virtual Segment Identifier (VSID)
VSP Voice Service Provider (VSP)
VSS Virtual Subnet Selection (VSS)
VT Virtual Tributary (VT)
Voltage Transformer (VT)
VTEP VXLAN Tunnel End Point (VTEP)
VTOL Vertical Take-Off and Landing (VTOL)
VXLAN Virtual eXtensible Local Area Network (VXLAN)
W3C * World Wide Web Consortium (W3C)
WAMS Wide-Area Management System (WAMS)
WAN * Wide Area Networks
WAP Wireless Application Protocol (WAP)
W-CDMA Wideband Code Division Multiple Access (W-CDMA)
WCE Write Cache Enable (WCE)
WDM Wavelength Division Multiplexing (WDM)
WebDAV Web Distributed Authoring and Versioning (WebDAV)
WEBRC Wave and Equation Based Rate Control (WEBRC)
WebRTC * Web Real-Time Communication (WebRTC)
WEP Wired Equivalent Privacy (WEP)
WF Wildcard-Filter (WF)
WFQ Weighted Fair Queuing (WFQ)
WG * Working Group
WGLC Working Group Last Call
WGS 84 World Geodetic System 1984 (WGS 84)
WHT Walsh-Hadamard transform (WHT)
WiLD WiFi-based Long Distance (WiLD)
WiMAX Worldwide Interoperability for Microwave Access (WiMAX)
WKP Well-Known Prefix (WKP)
Well-Known Port (WKP)
WLAN * Wireless Local Area Network (WLAN)
WLE Whole Label Evaluation (WLE)
WM Wireless Medium (WM)
WMN Wireless Mesh Network (WMN)
WOTS Winternitz One-Time Signature (WOTS)
WPA2 Wi-Fi Protected Access 2 (WPA2)
WRAP Web Resource Authorization Profiles (WRAP)
WRED Weighted Random Early Detection (WRED)
WRR Weighted Round Robin (WRR)
WS White Space (WS)
WSDL Web Services Description Language (WSDL)
WSON Wavelength Switched Optical Network (WSON)
WSP whitespace (WSP)
WSR Window Size Ratio (WSR)
WSS Wavelength Selective Switch (WSS)
Secure WebSocket (WSS)
Web Services Security (WSS)
WTP Wireless Termination Point (WTP)
WTR Wait to Restore (WTR)
WWN World Wide Name (WWN)
WWNN World Wide Node Name (WWNN)
WWPN World Wide Port Name (WWPN)
WWW * World Wide Web
XACML eXtensible Access Control Markup Language (XACML)
XCAP XML Configuration Access Protocol (XCAP)
Xcast Explicit Multicast (Xcast)
XCON Centralized Conferencing (XCON)
XDR External Data Representation (XDR)
XEID Extended Endpoint Identifier (XEID)
XHTML Extensible Hypertext Markup Language (XHTML)
XID Transaction ID
XIP Execute in Place (XIP)
XL Extension Label (XL)
XLAT translator (XLAT)
XML * Extensible Markup Language
XML-DA XML-Data Access (XML-DA)
XML-RPC Extensible Markup Language-Remote Procedure Calling (XML-RPC)
XMLDSIG XML Digital Signatures (XMLDSIG)
XMLSIG XML-Signature Syntax and Processing (XMLSIG)
XMP Extensible Metadata Platform (XMP)
XMPP Extensible Messaging and Presence Protocol (XMPP)
XNQ eXtended Network Quality (XNQ)
XOF extendable-output function (XOF)
XOR * exclusive or see EOR above
XoT XFR over TLS (XoT)
XPath XML Path Language (XPath)
XR Extended Report (XR)
XRD Extensible Resource Descriptor (XRD)
XRI Extensible Resource Identifier (XRI)
XRO Exclude Route Object (XRO)
XSD XML Schema Definition (XSD)
XSF XMPP Standards Foundation (XSF)
XSS cross-site scripting (XSS)
XTP Xpress Transfer Protocol (XTP)
Xpress Transport Protocol (XTP)
XUI XCAP User Identifier (XUI)
YADIFA * No expansion
YAML * Do not expand
YANG * Do not expand
YIN YANG Independent Notation (YIN)
ZKDF zone key derivation function (ZKDF)
ZRTP * Do not expand RFC 6189
ZWP Zero Window Probe (ZWP)
zsh Z SHell (zsh)
ZKPP Zero-Knowledge Password Proof (ZKPP)
ZRTP * No expansion
ZSK Zone Signing Key (ZSK)
abbrev_list.txt · Last modified: 2024/07/22 10:38 by leb