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Obsoleted by: 943 HISTORIC
Network Working Group                                        J. Reynolds
Request for Comments:  923                                     J. Postel
Obsoletes RFCs:  900, 870, 820,                             October 1984
790, 776, 770, 762, 758, 755,
750, 739, 604, 503, 433, 349
Obsoletes IENs:  127, 117, 93

                            ASSIGNED NUMBERS

Status of this Memo

   This memo is an official status report on the numbers used in
   protocols in the ARPA-Internet community.  Distribution of this memo
   is unlimited.


   This Network Working Group Request for Comments documents the
   currently assigned values from several series of numbers used in
   network protocol implementations.  This RFC will be updated
   periodically, and in any case current information can be obtained
   from Joyce Reynolds.  The assignment of numbers is also handled by
   Joyce.  If you are developing a protocol or application that will
   require the use of a link, socket, port, protocol, network number,
   etc., please contact Joyce to receive a number assignment.

      Joyce Reynolds
      USC - Information Sciences Institute
      4676 Admiralty Way
      Marina del Rey, California  90292-6695

      Phone: (213) 822-1511

      ARPA mail: [email protected]

   Most of the protocols mentioned here are documented in the RFC series
   of notes.  The more prominent and more generally used are documented
   in the "Internet Protocol Transition Workbook" [33] or in the old
   "ARPANET Protocol Handbook" [34] prepared by the NIC.  Some of the
   items listed are undocumented.  Further information on protocols can
   be found in the memo "Official ARPA-Internet Protocols" [89].

   In all cases the name and mailbox of the responsible individual is
   indicated.  In the lists that follow, a bracketed entry, e.g.,
   [nn,iii], at the right hand margin of the page indicates a reference
   for the listed protocol, where the number ("nn") cites the document
   and the letters ("iii") cites the person.  Whenever possible, letters
   are a NIC Ident as used in the WHOIS service.

Reynolds & Postel                                               [Page 1]

Assigned Numbers                                                 RFC 923
Network Numbers

                        ASSIGNED NETWORK NUMBERS

   The network numbers listed here are used as internet addresses by the
   Internet Protocol (IP) [33,77].  The IP uses a 32-bit address field
   and divides that address into a network part and a "rest" or local
   address part.  The division takes 3 forms or classes.

      The first type of address, or class A, has a 7-bit network number
      and a 24-bit local address.  The highest-order bit is set to 0.
      This allows 128 class A networks.

                           1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      |0|   NETWORK   |                Local Address                  |

                             Class A Address

      The second type of address, class B, has a 14-bit network number
      and a 16-bit local address.  The two highest-order bits are set to
      1-0.  This allows 16,384 class B networks.

                           1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      |1 0|           NETWORK         |          Local Address        |

                             Class B Address

      The third type of address, class C, has a 21-bit network number
      and a 8-bit local address.  The three highest-order bits are set
      to 1-1-0.  This allows 2,097,152 class C networks.

                           1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      |1 1 0|                    NETWORK              | Local Address |

                             Class C Address

      Note:  No addresses are allowed with the three highest-order bits
      set to 1-1-1.  These addresses (sometimes called "class D") are

Reynolds & Postel                                               [Page 2]

Assigned Numbers                                                 RFC 923
Network Numbers

   One commonly used notation for internet host addresses divides the
   32-bit address into four 8-bit fields and specifies the value of each
   field as a decimal number with the fields separated by periods.  This
   is called the "dotted decimal" notation.  For example, the internet
   address of USC-ISIF.ARPA in dotted decimal is, or

   The dotted decimal notation will be used in the listing of assigned
   network numbers.  The class A networks will have nnn.rrr.rrr.rrr, the
   class B networks will have nnn.nnn.rrr.rrr, and the class C networks
   will have nnn.nnn.nnn.rrr, where nnn represents part or all of a
   network number and rrr represents part or all of a local address.

   There are four catagories of users of Internet Addresses: Research,
   Defense, Government (Non-Defense), and Commercial.  To reflect the
   allocation of network identifiers among the categories, a
   one-character code is placed to the left of the network number: R for
   Research, D for Defense, G for Government, and C for Commercial (see
   Appendix A for further details on this division of the network

   Network numbers are assigned for networks that are connected to the
   ARPA-Internet and DDN-Internet, and for independent networks that use
   the IP family protocols (these are usually commercial).  These
   independent networks are marked with an asterisk preceding the

   The administrators of independent networks must apply separately for
   permission to interconnect their network with either the
   ARPA-Internet of the DDN-Internet.  Independent networks need not be
   listed in the working tables of either the ARPA-Internet or
   DDN-Internet hosts or gateways.

   For various reasons, the assigned numbers of networks are sometimes
   changed.  To ease the transition the old number will be listed for a
   transition period as well.  These "old number" entries will be marked
   with a "T" following the number and preceding the name, and the
   network name will be suffixed "-TEMP".

   Special Addresses:

      In certain contexts, it is useful to have fixed addresses with
      functional significance rather than as identifiers of specific
      hosts.  When such usage is called for, the address zero is to be
      interpreted as meaning "this", as in "this network".  The address
      of all ones are to be interpreted as meaning "all", as in "all
      hosts".  For example, the address could be

Reynolds & Postel                                               [Page 3]

Assigned Numbers                                                 RFC 923
Network Numbers

      interpreted as meaning all hosts on the network 128.9.  Or, the
      address could be interpreted as meaning host 37 on this

   Assigned Network Numbers

   Class A Networks

      * Internet Address  Name          Network               References
      - ----------------  ----          -------               ----------
        000.rrr.rrr.rrr                 Reserved                   [JBP]
      R 004.rrr.rrr.rrr   SATNET        Atlantic Satellite Network[DM11]
      D 006.rrr.rrr.rrr T YPG-NET-TEMP  Yuma Proving Grounds     [7,BXA]
      D 007.rrr.rrr.rrr T EDN-TEMP      DCEC EDN                   [EC5]
      R 008.rrr.rrr.rrr T BBN-NET-TEMP  BBN Network               [JSG5]
      R 010.rrr.rrr.rrr   ARPANET       ARPANET              [7,34,REK2]
      D 011.rrr.rrr.rrr   DODIIS        DoD INTEL INFO SYS         [AY7]
      C 012.rrr.rrr.rrr   ATT           ATT, Bell Labs            [MH13]
      C 014.rrr.rrr.rrr   PDN           Public Data Network       [REK4]
      R 018.rrr.rrr.rrr T MIT-TEMP      MIT Network         [15,88,DDC2]
      D 022.rrr.rrr.rrr   DISNET        DISNET                    [FLM2]
      D 023.rrr.rrr.rrr   DDN-TC-NET    DDN-TestCell-Network      [DH17]
      D 024.rrr.rrr.rrr   MINET         MINET                    [7,DHH]
      D 026.rrr.rrr.rrr   MILNET        MILNET                    [FLM2]
      R 027.rrr.rrr.rrr T NOSC-LCCN-TEMPNOSC / LCCN                [RH6]
      R 028.rrr.rrr.rrr   WIDEBAND      Wide Band Satellite Net   [CJW2]
      R 032.rrr.rrr.rrr   UCL-TAC       UCL TAC                     [PK]
      R 036.rrr.rrr.rrr T SU-NET-TEMP   Stanford University Network[JCM]
      R 039.rrr.rrr.rrr T SRINET-TEMP   SRI Local Network         [GEOF]
      R 041.rrr.rrr.rrr   BBN-TEST-A    BBN-GATE-TEST-A            [RH6]
      R 044.rrr.rrr.rrr   AMPRNET       Amateur Radio Experiment Net[HM]
        001.rrr.rrr.rrr-003.rrr.rrr.rrr Unassigned                 [JBP]
        005.rrr.rrr.rrr                 Unassigned                 [JBP]
        009.rrr.rrr.rrr                 Unassigned                 [JBP]
        013.rrr.rrr.rrr                 Unassigned                 [JBP]
        015.rrr.rrr.rrr-017.rrr.rrr.rrr Unassigned                 [JBP]
        019.rrr.rrr.rrr-021.rrr.rrr.rrr Unassigned                 [JBP]
        025.rrr.rrr.rrr                 Unassigned                 [JBP]
        029.rrr.rrr.rrr-031.rrr.rrr.rrr Unassigned                 [JBP]
        033.rrr.rrr.rrr-035.rrr.rrr.rrr Unassigned                 [JBP]
        037.rrr.rrr.rrr-038.rrr.rrr.rrr Unassigned                 [JBP]
        040.rrr.rrr.rrr                 Unassigned                 [JBP]
        042.rrr.rrr.rrr-043.rrr.rrr.rrr Unassigned                 [JBP]
        045.rrr.rrr.rrr-126.rrr.rrr.rrr Unassigned                 [JBP]
        127.rrr.rrr.rrr                 Reserved                   [JBP]

Reynolds & Postel                                               [Page 4]

Assigned Numbers                                                 RFC 923
Network Numbers

   Class B Networks

      * Internet Address  Name          Network               References
      - ----------------  ----          -------               ----------
        128.000.rrr.rrr                 Reserved                   [JBP]
      R 128.001.rrr.rrr   BBN-TEST-B    BBN-GATE-TEST-B            [RH6]
      R 128.002.rrr.rrr   CMU-NET       CMU-Ethernet              [HDW2]
      R 128.003.rrr.rrr   LBL-CSAM      LBL-CSAM-RESEARCH         [JS38]
      R 128.004.rrr.rrr   DCNET         LINKABIT DCNET         [59,DLM1]
      R 128.005.rrr.rrr   FORDNET       FORD DCNET             [59,DLM1]
      R 128.006.rrr.rrr   RUTGERS       RUTGERS                   [CLH3]
      R 128.007.rrr.rrr   DFVLR         DFVLR DCNET Network       [HDC1]
      R 128.008.rrr.rrr   UMDNET        Univ of Maryland DCNET [59,DLM1]
      R 128.009.rrr.rrr   ISI-NET       USC-ISI Local Network      [CMR]
      R 128.010.rrr.rrr   PURDUE-CS     Purdue Computer Science    [CAK]
      R 128.011.rrr.rrr   BBN-CRONUS    BBN DOS Project         [55,WIM]
      R 128.012.rrr.rrr   SU-NET        Stanford University Net    [JCM]
      D 128.013.rrr.rrr   MATNET        Mobile Access Terminal Net[DM11]
      R 128.014.rrr.rrr   BBN-SAT-TEST  BBN SATNET Test Net       [DM11]
      R 128.015.rrr.rrr   S1NET         LLL-S1-NET                [EAK1]
      R 128.016.rrr.rrr   UCLNET        University College London   [PK]
      D 128.017.rrr.rrr   MATNET-ALT    Mobile Access Terminal Alt[DM11]
      R 128.018.rrr.rrr   SRINET        SRI Local Network         [GEOF]
      D 128.019.rrr.rrr   EDN           DCEC EDN                   [EC5]
      D 128.020.rrr.rrr   BRLNET        BRLNET                  [7,MJM2]
      R 128.021.rrr.rrr   SF-PR-1       SF-1 Packet Radio Network  [JEM]
      R 128.022.rrr.rrr   SF-PR-2       SF-2 Packet Radio Network  [JEM]
      R 128.023.rrr.rrr   BBN-PR        BBN Packet Radio Network  [JAW3]
      R 128.024.rrr.rrr   ROCKWELL-PR   Rockwell Packet Radio Net  [EHP]
      D 128.025.rrr.rrr   BRAGG-PR      Ft. Bragg Packet Radio Net [JEM]
      D 128.026.rrr.rrr   SAC-PR        SAC Packet Radio Network   [BG5]
      D 128.027.rrr.rrr   DEMO-PR-1     Demo-1 Packet Radio Network[LCS]
      D 128.028.rrr.rrr   C3-PR         Testbed Development PR NET [BG5]
      R 128.029.rrr.rrr   MITRE         MITRE Cablenet          [94,APS]
      R 128.030.rrr.rrr   MIT-NET       MIT Local Network         [DDC2]
      R 128.031.rrr.rrr   MIT-RES       MIT Research Network      [DDC2]
      R 128.032.rrr.rrr   UCB-ETHER     UC Berkeley Ethernet      [DAM1]
      R 128.033.rrr.rrr   BBN-NET       BBN Network               [JSG5]
      R 128.034.rrr.rrr   NOSC-LCCN     NOSC / LCCN                [RH6]
      R 128.035.rrr.rrr   CISLTESTNET1  Honeywell            [46,47,RK1]
      R 128.036.rrr.rrr   YALE-NET      YALE NET               [108,JO5]
      D 128.037.rrr.rrr   YPG-NET       Yuma Proving Grounds     [7,BXA]
      D 128.038.rrr.rrr   NSWC-NET      NSWC Local Host Net       [RLH2]
      R 128.039.rrr.rrr   NTANET        NDRE-TIU                   [PS3]
      R 128.040.rrr.rrr   UCL-NET-A     UCL                        [RC7]
      R 128.041.rrr.rrr   UCL-NET-B     UCL                        [RC7]
      R 128.042.rrr.rrr   RICE-NET      Rice University     [59,108,PGM]
      R 128.043.rrr.rrr   CRANET        Canada REF ARPANET      [7,JR17]

Reynolds & Postel                                               [Page 5]

Assigned Numbers                                                 RFC 923
Network Numbers

      D 128.044.rrr.rrr   WSMR-NET      White Sands Network        [TBS]
      C 128.045.rrr.rrr   DEC-WRL-NET   DEC WRL Network       [108,RKJ2]
        128.046.rrr.rrr   Unassigned    Unassigned                 [JBP]
      D 128.047.rrr.rrr   TACTNET       Tactical Packet Net      [6,KTP]
      C*128.048.rrr.rrr   UCDLA-NET     UCDLA MELVYL Network     [7,CXL]
      R 128.049.rrr.rrr   NOSC-ETHER    NOSC Ethernet         [108,RLB3]
      G 128.050.rrr.rrr   COINS Network COINS On-Line Intel Net   [RLS6]
      G 128.051.rrr.rrr   COINSTNET     COINS TEST NETWORK        [RLS6]
      R 128.052.rrr.rrr   MIT-AI-NET    MIT AI NET             [108,MDC]
      R 128.053.rrr.rrr   SAC-PR-2      SAC PRNET Number 2         [BG5]
      R 128.054.rrr.rrr   UCSD          UC San Diego Network  [108,GH29]
        128.055.rrr.rrr-128.063.rrr.rrr Unassigned                 [JBP]
      R 128.064.rrr.rrr-128.079.rrr.rrr Net Dynamics Exp           [ZSU]
        128.080.rrr.rrr-191.254.rrr.rrr Unassigned                 [JBP]
        191.255.rrr.rrr                 Reserved                   [JBP]

   Class C Networks

      * Internet Address  Name          Network               References
      - ----------------  ----          -------               ----------
        192.000.000.rrr                 Reserved                   [JBP]
      R 192.000.001.rrr   BBN-TEST-C    BBN-GATE-TEST-C            [RH6]
        192.000.002.rrr-192.000.255.rrr Unassigned                 [JBP]
      R 192.001.000.rrr-192.003.255.rrr BBN local networks         [SGC]
      R*192.004.000.rrr-192.004.255.rrr Bellcore-Net           [108,PXK]
      R 192.005.001.rrr   CISLHYPERNET  Honeywell                  [RK1]
      R 192.005.002.rrr   WISC          Univ of Wisconsin Madison [RS23]
      C 192.005.003.rrr   HP-DESIGN-AIDS HP Design Aids            [NXK]
      C 192.005.004.rrr   HP-TCG-UNIX   Hewlett Packard TCG Unix   [NXK]
      R 192.005.005.rrr   DEC-MRNET     DEC Marlboro Ethernet  [101,KWP]
      R 192.005.006.rrr   DEC-MRRAD     DEC Marlboro Developmt [101,KWP]
      R 192.005.007.rrr   CIT-CS-NET    Caltech-CS-Net         [107,DSW]
      R 192.005.008.rrr   WASHINGTON    University of Washington  [JAR4]
      R 192.005.009.rrr   AERONET       Aerospace Labnet         [2,LCN]
      R 192.005.010.rrr   ECLNET        USC-ECL-CAMPUS-NET        [MAB4]
      R 192.005.011.rrr   CSS-RING      SEISMIC-RESEARCH-NET       [RR2]
      R 192.005.012.rrr   UTAH-NET      UTAH-COMPUTER-SCIENCE-NET  [RF1]
      R 192.005.013.rrr   GSWDNET       Compion Network        [108,FAS]
      R 192.005.014.rrr   RAND-NET      RAND Network           [108,JDG]
      R 192.005.015.rrr   NYU-NET       NYU Network                [EF5]
      R 192.005.016.rrr   LANL-LAND     Los Alamos Dev LAN    [108,JC11]
      R 192.005.017.rrr   NRL-NET       Naval Research Lab          [AP]
      R 192.005.018.rrr   IPTO-NET      ARPA-IPTO Office Net      [REK2]
      R 192.005.019.rrr   UCIICS        UCI-ICS Res Net            [MTR]
      R 192.005.020.rrr   CISLTTYNET    Honeywell                  [RK1]
      D 192.005.021.rrr   BRLNET1       BRLNET1                 [7,MJM2]
      D 192.005.022.rrr   BRLNET2       BRLNET2                 [7,MJM2]
      D 192.005.023.rrr   BRLNET3       BRLNET3                 [7,MJM2]

Reynolds & Postel                                               [Page 6]

Assigned Numbers                                                 RFC 923
Network Numbers

      D 192.005.024.rrr   BRLNET4       BRLNET4                 [7,MJM2]
      D 192.005.025.rrr   BRLNET5       BRLNET5                 [7,MJM2]
      D 192.005.026.rrr   NSRDCOA-NET   NSRDC Office Auto Net      [TC4]
      D 192.005.027.rrr   DTNSRDC-NET   DTNSRDC-NET                [TC4]
      R 192.005.028.rrr   RSRE-NULL     RSRE-NULL                   [NM]
      R 192.005.029.rrr   RSRE-ACC      RSRE-ACC                    [NM]
      R 192.005.030.rrr   RSRE-PR       RSRE-PR                     [NM]
      R*192.005.031.rrr   SIEMENS-NET   Siemens Research Network   [PXN]
      R 192.005.032.rrr   CISLTESTNET2  Honeywell            [46,47,RK1]
      R 192.005.033.rrr   CISLTESTNET3  Honeywell            [27,28,RK1]
      R 192.005.034.rrr   CISLTESTNET4  Honeywell            [27,28,RK1]
      R 192.005.035.rrr   RIACS         USRA                  [108,RLB1]
      R 192.005.036.rrr   CORNELL-CS    CORNELL CS Research    [108,DK2]
      R 192.005.037.rrr   UR-CS-NET     U of R CS 3Mb Net       [58,LB1]
      R 192.005.038.rrr   SRI-C3ETHER   SRI-AITAD C3ETHERNET   [108,BG5]
      R 192.005.039.rrr   UDEL-EECIS    Udel EECIS LAN         [102,CC2]
      R 192.005.040.rrr   PUCC-NET-A    PURDUE Comp Cntr Net      [JRS8]
      D 192.005.041.rrr   WISLAN        WIS Research LAN       [94,JRM1]
      D 192.005.042.rrr   AFDSC-HYPER   AFDSC Hypernet            [MCSJ]
      R 192.005.043.rrr   CUCSNET       Columbia CS Net        [108,LH2]
      R 192.005.044.rrr   Farber-PC-Net Farber PC Network          [DJF]
      R 192.005.045.rrr   AIDS-NET      AI&DS Network           [108,HA]
      R 192.005.046.rrr   NTA-RING      NDRE-RING                  [PS3]
      R 192.005.047.rrr   NSRDC         NSRDC                      [PXM]
      R 192.005.048.rrr   PURDUE-CS-IL  Purdue CS IL Ethernet  [108,CAK]
      R 192.005.049.rrr   UCSF          Univ of Calif, San Fran[102,TF6]
      R 192.005.050.rrr   CTH-CS-NET    Chalmers CSN Net       [102,UXB]
      R 192.005.051.rrr   Theorynet     Cornell Theory Center [108,AB13]
      R 192.005.052.rrr   NLM-ETHER     NLM-LHNCBC-ETHERNET     [77,JA1]
      R 192.005.053.rrr   UR-CS-ETHER   U of R CS 10Mb Net      [58,LB1]
      R 192.005.054.rrr   AERO-A6       Aerospace                [2,LCN]
      R*192.005.055.rrr   UCLA-CECS     UCLA-CECS Network      [108,RBW]
      C 192.005.056.rrr   TARTAN-NET    Tartan Labs                [SXB]
      R 192.005.057.rrr   UDEL-CC       UDEL Comp Center      [102,RR18]
      R 192.005.058.rrr   CSNET-PDN     CSNET X.25 Network     [52,RDR4]
      R*192.005.059.rrr   Inria SM90    Inria GIP SM-90            [MXS]
      R*192.005.060.rrr   SM90 X1       Inria SM-90 exp. 1         [MXS]
      R*192.005.061.rrr   SM90 X2       Inria SM-90 exp. 2         [MXS]
      R*192.005.062.rrr   LITP SM90     LITP SM-90                 [MXS]
      R 192.005.064.rrr   AMES-NAS-NET  NASA ARC NAS LAN      [101,MF31]
      R 192.005.065.rrr   NPRDC-Ether   NPRDC TRCF Ethernet        [LRB]
      R 192.005.066.rrr   HARV-NET      Harvard Comp Sci Net      [SXB1]
      R 192.005.067.rrr   CECOM-ETHER   CECOM ADDCOMPE ETHER   [102,GIH]
      R 192.005.068.rrr   AERO-130      AEROSPACE-130              [LCN]
      R 192.005.069.rrr   UIUC-NET      Univ of IL at Urbana   [108,AXC]
      G 192.005.070.rrr   CELAN         COINS Exper. LAN           [MXM]
      R 192.005.071.rrr   SAC-ETHER     SAC C3 Ethernet        [108,BG5]
      R*192.005.072.rrr-192.005.087.rrr U Chicago                  [TXN]

Reynolds & Postel                                               [Page 7]

Assigned Numbers                                                 RFC 923
Network Numbers

      R 192.005.088.rrr   YALE-EE-NET   YALE-EE-NET           [108,AG22]
      R 192.005.089.rrr   UTEXAS-NET    U. Texas Austin Net   [108,JSQ1]
      R 192.005.090.rrr   HARV-ETHER    Harvard CS Ethernet       [SXB1]
      R 192.005.091.rrr   PURDUE-ECN1   Purdue ECN          [30,49,GG11]
      R 192.005.092.rrr   BRAGG-ETHER   SRI Bragg Ether        [103,GIH]
      R 192.005.093.rrr   SRI-DEMO      SRI Ether Demo         [103,GIH]
      R*192.005.094.rrr   SDCRDCF-10MB  SDC R&D primary net   [108,DJV1]
      R*192.005.095.rrr   SDCRDCF-3MB   SDC R&D old net        [58,DJV1]
      R*192.005.096.rrr   UBC-CS-NET    UBC Comp Sci Net       [108,PXB]
      R*192.005.097.rrr   UCLA-CS-LNI   UCLA CS LNI Network        [RBW]
      R*192.005.098.rrr   UCLA-PIC      UCLA PIC Network       [108,RBW]
      R 192.005.099.rrr   SPACENET      S-1 Workstation Network[108,TXW]
      R 192.005.100.rrr   PURDUE-ECN2   Purdue ECN          [30,49,GG11]
      R 192.005.101.rrr   PUCC-GW-NET   Purdue Gateway Network    [JRS8]
      R 192.005.102.rrr   PUCC-RHF-NET  PUCC RHF Based Net        [JRS8]
      C*192.005.103.rrr   TYM-NTD-NET   Tymnet NTD Ethernet        [SMF]
      R 192.005.104.rrr   TMC-INET      Thinking Machines     [108,BJN1]
      R 192.005.105.rrr   CCA-POND      CCA Ethernet1 (POND)   [108,AL6]
      C*192.005.106.rrr   BITSTREAM     Bitstream Type Foundry [108,PXA]
      R*192.005.107.rrr   PASC-ETHER    IBM PASC Ethernet      [108,GXL]
      R*192.005.108.rrr   PASC-BB       IBM PASC Broadband      [50,GXL]
        192.005.109.rrr-192.005.255.rrr Unassigned                 [JBP]
      C*192.006.000.rrr-192.006.255.rrr Hewlett Packard            [AXG]
      C*192.007.000.rrr-192.007.255.rrr Computer Consoles, Inc.   [RA11]
      C*192.008.000.rrr-192.008.255.rrr Spartacus Computers, Inc.  [SXM]
      C*192.009.000.rrr-192.009.255.rrr SUN Microsystem, Inc.      [WNJ]
      C*192.010.000.rrr-192.010.040.rrr Symbolics, Inc.            [CH2]
      R 192.010.041.rrr   SCRC-ETHERNET SCRC ETHERNET          [108,CH2]
      C*192.010.042.rrr-192.010.255.rrr Symbolics, Inc.            [CH2]
      C*192.011.000.rrr-192.011.255.rrr ATT, Bell Labs            [MH12]
      C*192.012.000.rrr   CADMUS-ETHERNET CADMUS-NET               [MS9]
      C*192.012.001.rrr   CADMUS-EXP-1  CADMUS-NET-EXP-1           [MS9]
      C*192.012.002.rrr   CADMUS-EXP-2  CADMUS-NET-EXP-2           [MS9]
      C*192.012.003.rrr   FLAIR         Fairchild AI Lab Net  [108,AMS1]
      C*192.012.004.rrr   SCG-NET       Hughes SCG Net         [108,MXP]
      R 192.012.005.rrr   AIC-LISPMS    SRI-AIC-LispMachNet    [108,PM4]
      R 192.012.006.rrr   NPS-C2        NPS-C2                 [108,AW9]
      R 192.012.007.rrr   NYU-CS-ETHER  NYU CompSci Ethernet   [108,LOU]
      D 192.012.008.rrr   PICANET1      Picatinny Arsenal LAN1[108,RFD1]
      R 192.012.009.rrr   CADRE-NET     Decision Systems Lab       [SM6]
      R 192.012.010.rrr   CORNELL-ENG   Cornell-Engineering    [108,BN9]
      R 192.012.011.rrr   MIT-36        MIT Building 36       [108,RH60]
      R 192.012.012.rrr   WISC-ETHER    Wisconsin Ether Net    [108,CBP]
      R 192.012.013.rrr   JHU-NET1      JHU-NET1              [108,MO14]
      R 192.012.014.rrr   JHU-NET2      JHU-NET2              [108,MO14]
      R 192.012.015.rrr   BROOKNET      BNL Brooknet III        [108,GC]
      R 192.012.016.rrr   PRMNET        SRI-SURAN-EN          [108,BP17]
      G 192.012.017.rrr   LLL-TIS-NET   LLL-TIS-NET       [101,105,GP10]

Reynolds & Postel                                               [Page 8]

Assigned Numbers                                                 RFC 923
Network Numbers

      R 192.012.018.rrr   CIT-CS-10NET  Caltech 10Meg EtherNet[107,AD22]
      R 192.012.019.rrr   CIT-NET       Caltech Campus Net    [107,AD22]
      R 192.012.020.rrr   CIT-SUN-NET   Caltech Sun Net       [107,AD22]
      R 192.012.021.rrr   CIT-PHYSCOMP  Caltech Phys Comp Net [107,AD22]
      R 192.012.022.rrr   UTCSRES       UTCS Net Research     [108,JSQ1]
      R 192.012.023.rrr   UTCSTTY       UTCS TTY Kludgenet    [108,JSQ1]
      R 192.012.024.rrr   MICANET       MITRE (Experimental)       [JN2]
      R 192.012.025.rrr   CSS-GRAMINAE  CSS Workstation Net     [53,RR2]
      R 192.012.026.rrr   BBN-NETR      Net-R Testbed at BBN   [91,CP10]
      R 192.012.027.rrr   UR-LASER      UR Laser Energetics    [108,WXL]
        192.012.028.rrr-192.012.255.rrr Unassigned                 [JBP]
      D 192.013.000.rrr-192.014.255.rrr DODIIS Subnetworks         [AY5]
        192.015.000.rrr-223.255.254.rrr Unassigned                 [JBP]
        223.255.255.rrr                 Reserved                   [JBP]

   Other Reserved Internet Addresses

      * Internet Address  Name          Network               References
      - ----------------  ----          -------               ---------- Reserved                   [JBP]

Reynolds & Postel                                               [Page 9]

Assigned Numbers                                                 RFC 923
Network Numbers

   Network Totals

      Assigned for the ARPA-Internet and the DDN-Internet

         Class         A         B         C     Total

         Research      6        53       854       913

         Defense       5        12       523       540

         Government    0         2         2         4

         Commercial    2         1         3         6

         Total        13        68      1382      1463

      Allocated for Internet and Independent Uses

         Class         A         B         C     Total

         Research      6        53      1139      1198

         Defense       5        12       523       540

         Government    0         2         2         4

         Commercial    2         2      1545      1549

         Total        13        69      3209      3291

      Maximum Allowed

         Class         A         B         C     Total

         Research      8      1024     65536     66568

         Defense      24      3072    458752    461848

         Government   24      3072    458752    461848

         Commercial   74      9214   1114137   1123394

         Total       126     16382   2097150   2113658

Reynolds & Postel                                              [Page 10]

Assigned Numbers                                                 RFC 923
Version Numbers

                        ASSIGNED VERSION NUMBERS

   In the Internet Protocol (IP) [33,77] there is a field to identify
   the version of the internetwork general protocol.  This field is 4
   bits in size.

   Assigned Internet Version Numbers

      Decimal   Keyword    Version                            References
      -------   -------    -------                            ----------
          0                Reserved                                [JBP]
        1-3                Unassigned                              [JBP]
          4       IP       Internet Protocol                 [31,71,JBP]
          5       ST       ST Datagram Mode                     [34,JWF]
       6-14                Unassigned                              [JBP]
         15                Reserved                                [JBP]

Reynolds & Postel                                              [Page 11]

Assigned Numbers                                                 RFC 923
Protocol Numbers

                       ASSIGNED PROTOCOL NUMBERS

   In the Internet Protocol (IP) [33,77] there is a field, called
   Protocol, to identify the the next level protocol.  This is an 8 bit

   Assigned Internet Protocol Numbers

      Decimal    Keyword     Protocol                         References
      -------    -------     --------                         ----------
           0                 Reserved                              [JBP]
           1     ICMP        Internet Control Message           [69,JBP]
           2                 Unassigned                            [JBP]
           3     GGP         Gateway-to-Gateway                  [45,MB]
           4                 Unassigned                            [JBP]
           5     ST          Stream                             [37,JWF]
           6     TCP         Transmission Control            [33,78,JBP]
           7     UCL         UCL                                    [PK]
           8     EGP         Exterior Gateway Protocol         [93,DLM1]
           9     IGP         any private interior gateway          [JBP]
          10     BBN-RCC-MON BBN RCC Monitoring                    [SGC]
          11     NVP-II      Network Voice Protocol             [16,SC3]
          12     PUP         PUP                                [11,HGM]
          13     ARGUS       ARGUS                                [RWS4]
          14     EMCON       EMCON                                 [BN7]
          15     XNET        Cross Net Debugger                [43,JFH2]
          16     CHAOS       Chaos                                 [NC3]
          17     UDP         User Datagram                   [33,76,JBP]
          18     MUX         Multiplexing                       [17,JBP]
          19     DCN-MEAS    DCN Measurement Subsystems           [DLM1]
          20     HMP         Host Monitoring                     [4,RH6]
          21     PRM         Packet Radio Measurement              [ZSU]
          22     XNS-IDP     XEROX NS IDP                      [109,LLG]
          23     TRUNK-1     Trunk-1                               [BML]
          24     TRUNK-2     Trunk-2                               [BML]
          25     LEAF-1      Leaf-1                                [BML]
          26     LEAF-2      Leaf-2                                [BML]
          27     RDP         Reliable Data Protocol            [106,RH6]
       28-60                 Unassigned                            [JBP]
          61                 any host internal protocol            [JBP]
          62     CFTP        CFTP                              [38,HCF2]
          63                 any local network                     [JBP]
          64     SAT-EXPAK   SATNET and Backroom EXPAK            [DM11]
          65     MIT-SUBNET  MIT Subnet Support                    [NC3]
          66     RVD         MIT Remote Virtual Disk Protocol      [MBG]
          67     IPPC        Internet Pluribus Packet Core        [DM11]
          68                 any distributed file system           [JBP]
          69     SAT-MON     SATNET Monitoring                    [DM11]

Reynolds & Postel                                              [Page 12]

Assigned Numbers                                                 RFC 923
Protocol Numbers

          70                 Unassigned                            [JBP]
          71     IPCV        Internet Packet Core Utility         [DM11]
       72-75                 Unassigned                            [JBP]
          76     BR-SAT-MON  Backroom SATNET Monitoring           [DM11]
          77                 Unassigned                            [JBP]
          78     WB-MON      WIDEBAND Monitoring                  [DM11]
          79     WB-EXPAK    WIDEBAND EXPAK                       [DM11]
      80-254                 Unassigned                            [JBP]
         255                 Reserved                              [JBP]

Reynolds & Postel                                              [Page 13]

Assigned Numbers                                                 RFC 923
Port Numbers

                         ASSIGNED PORT NUMBERS

   Ports are used in the TCP [33,78] to name the ends of logical
   connections which carry long term conversations.  For the purpose of
   providing services to unknown callers, a service contact port is
   defined.  This list specifies the port used by the server process as
   its contact port.  The contact port is sometimes called the
   "well-known port".

   To the extent possible, these same port assignments are used with the
   UDP [33,76].

   The assigned ports use a small portion of the possible port numbers.
   The assigned ports have all except the low order eight bits cleared
   to zero.  The low order eight bits are specified here.

   Port Assignments:

      Decimal   Keyword   Description                         References
      -------   -------   -----------                         ----------
      0                   Reserved                                 [JBP]
      1-4                 Unassigned                               [JBP]
      5        RJE        Remote Job Entry                   [13,34,JBP]
      7        ECHO       Echo                                  [67,JBP]
      9        DISCARD    Discard                               [66,JBP]
      11       USERS      Active Users                          [62,JBP]
      13       DAYTIME    Daytime                               [65,JBP]
      15       NETSTAT    Who is up or NETSTAT                     [JBP]
      17       QUOTE      Quote of the Day                      [72,JBP]
      19       CHARGEN    Character Generator                   [64,JBP]
      20       FTP        File Transfer [Default Data]       [33,68,JBP]
      21       FTP        File Transfer [Control]            [33,68,JBP]
      23       TELNET     Telnet                                [84,JBP]
      25       SMTP       Simple Mail Transfer               [33,74,JBP]
      27       NSW-FE     NSW User System FE                    [18,RHT]
      29       MSG-ICP    MSG ICP                               [60,RHT]
      31       MSG-AUTH   MSG Authentication                    [60,RHT]
      33                  Unassigned                               [JBP]
      35                  any printer server                       [JBP]
      37       TIME       Time                                  [80,JBP]
      39       RLP        Resource Location Protocol              [1,MA]
      41       GRAPHICS   Graphics                           [34,98,JBP]
      42       NAMESERVER Host Name Server                   [33,71,JBP]
      43       NICNAME    Who Is                            [33,42,JAKE]
      44       MPM-FLAGS  MPM FLAGS Protocol                       [JBP]
      45       MPM        Message Processing Module [recv]      [70,JBP]
      46       MPM        MPM [default send]                    [76,JBP]
      47       NI-FTP     NI FTP                                [104,SK]

Reynolds & Postel                                              [Page 14]

Assigned Numbers                                                 RFC 923
Port Numbers

      49       LOGIN      Login Host Protocol                     [PHD1]
      51       LA-MAINT   IMP Logical Address Maintenance       [57,AGM]
      53       DOMAIN     Domain Name Server                       [PM1]
      55       ISI-GL     ISI Graphics Language                 [10,RB6]
      57                  any private terminal access              [JBP]
      59                  any private file service                 [JBP]
      61       NI-MAIL    NI MAIL                                 [8,SK]
      63       VIA-FTP    VIA Systems - FTP                        [DXD]
      65                  Unassigned                               [JBP]
      67                  Unassigned                               [JBP]
      69       TFTP       Trivial File Transfer              [33,87,KRS]
      71       NETRJS     Remote Job Service                 [12,34,RTB]
      72       NETRJS     Remote Job Service                 [12,34,RTB]
      73       NETRJS     Remote Job Service                 [12,34,RTB]
      74       NETRJS     Remote Job Service                 [12,34,RTB]
      75                  any private dial out service             [JBP]
      77                  any private RJE service                  [JBP]
      79       FINGER     Finger                             [34,40,KLH]
      81                  HOSTS2 Name Server                      [EAK1]
      83       HOSTS2-NS  MIT ML Device                            [DPR]
      85       MIT-ML-DEV MIT ML Device                            [DPR]
      87       MIT-ML-DEV Any Private Terminal Link                [JBP]
      89       SU-MIT-TG  SU/MIT Telnet Gateway                    [MRC]
      91       MIT-DOV    MIT Dover Spooler                        [EBM]
      93       DCP        Device Control Protocol                 [DT15]
      95       SUPDUP     SUPDUP                                [21,MRC]
      97       SWIFT-RVF  Swift Remote Vitural File Protocol       [MXR]
      99       METAGRAM   Metagram Relay                          [GEOF]
      101      HOSTNAME   NIC Host Name Server              [33,41,JAKE]
      103                 Unassigned                               [JBP]
      105      CSNET-NS   Mailbox Name Nameserver              [96,MHS1]
      107      RTELNET    Remote Telnet Service                 [73,JBP]
      109      POP        Post Office Protocol                [110,JKR1]
      111      SUNRPC     SUN Remote Procedure Call                [DXG]
      113      AUTH       Authentication Service               [99,MCSJ]
      115      SFTP       Simple File Transfer Protocol         [54,MXL]
      116                 Unassigned                               [JBP]
      117      UUCP-PATH  UUCP Path Service                     [32,MAE]
      118-129             Unassigned                               [JBP]
      131                 Unassigned                               [JBP]
      132-223             Reserved                                 [JBP]
      224-241             Unassigned                               [JBP]
      243      SUR-MEAS   Survey Measurement                      [9,AV]
      245      LINK       LINK                                 [14,RDB2]
      247-255             Unassigned                               [JBP]

Reynolds & Postel                                              [Page 15]

Assigned Numbers                                                 RFC 923
Autonomous System Numbers


   The Exterior Gateway Protocol (EGP) [93,90] specifies that groups of
   gateways may form autonomous systems.  The EGP provides a 16-bit
   field for identifying such systems.  The values of this field are
   registered here.

   Autonomous System Numbers:

      Decimal   Name                                          References
      -------   ----                                          ----------
            0   Reserved                                           [JBP]
            1   The BBN Gateways                                    [MB]
            2   DCN-AS                                            [DLM1]
            3   The MIT Gateways                                   [LM8]
            4   ISI-AS                                            [JKR1]
            5   Symbolics                                          [CH2]
            6   HIS-Multics                                    [BIM,RK1]
            7   UK-MOD                                            [RNM1]
            8   RICE-AS                                            [PGM]
            9   CMU-ROUTER                                          [MA]
            10  CSNET-PDN-AS                                      [RDR4]
            11  HARVARD                                           [SXB1]
            12  NYU-DOMAIN                                         [EF5]
            13  BRL-AS                                            [RBN1]
            14  COLUMBIA-GW                                       [BC14]
            15  NET DYNAMICS EXP                                   [ZSU]
            16  LBL                                                 [WG]
            17  PURDUE-CS                                         [KCS1]
            18  UTEXAS                                            [JSQ1]
            19  CSS-DOMAIN                                         [RR2]
            20  UR                                                [LB16]
            21  RAND                                               [JDG]
            22  NOSC                                              [RLB3]
            23  RIACS-AS                                          [DG28]
            24  AMES-NAS-GW                                       [MF31]
            25  UCB                                               [MK17]
            26  CORNELL                                            [BN9]
            27  UMDNET                                            [JWO1]
            28  DFVLR-SYS                                         [HDC1]
            29  YALE-AS                                           [JG46]
            30  SRI-AICnet                                         [PM4]
            31  CIT-CS                                            [AD22]
            32  STANFORD                                           [PA5]
            33  DEC-WRL-AS                                        [RKJ2]
            34  UDEL-EECIS                                         [NMM]
            35  MICATON                                            [JN2]
      36-65534  Unassigned                                         [JBP]

Reynolds & Postel                                              [Page 16]

Assigned Numbers                                                 RFC 923
Autonomous System Numbers

        65535   Reserved                                           [JBP]

Reynolds & Postel                                              [Page 17]

Assigned Numbers                                                 RFC 923
ARPANET Logical Addresses


   The ARPANET facility for "logical addressing" is described in
   RFC 878 [56].  A portion of the possible logical addresses are
   reserved for standard uses.

   There are 49,152 possible logical host addresses.  Of these, 256 are
   reserved for assignment to well-known functions.  Assignments for
   well-known functions are made by Joyce Reynolds.  Assignments for
   other logical host addresses are made by the NIC.

   Logical Address Assignments:

      Decimal    Description                                  References
      -------    -----------                                  ----------
      0          Reserved                                          [JBP]
      1          The BBN Gateways                                   [MB]
      2-255      Unassigned                                        [JBP]
      256        Reserved                                          [JBP]

Reynolds & Postel                                              [Page 18]

Assigned Numbers                                                 RFC 923
ARPANET Link Numbers


   The word "link" here refers to a field in the original ARPANET
   Host/IMP interface leader.  The link was originally defined as an
   8-bit field.  Later specifications defined this field as the
   "message-id" with a length of 12 bits.  The name link now refers to
   the high order 8 bits of this 12-bit message-id field.  The Host/IMP
   interface is defined in BBN Report 1822 [7].

   The low-order 4 bits of the message-id field are called the sub-link.
   Unless explicitly specified otherwise for a particular protocol,
   there is no sender to receiver significance to the sub-link.  The
   sender may use the sub-link in any way he chooses (it is returned in
   the RFNM by the destination IMP), the receiver should ignore the

   Link Assignments:

      Decimal   Description                                   References
      -------   -----------                                   ----------
      0         Reserved                                           [JBP]
      1-149     Unassigned                                         [JBP]
      150       Xerox NS IDP                                   [109,LLG]
      151       Unassigned                                         [JBP]
      152       PARC Universal Protocol                         [11,HGM]
      153       TIP Status Reporting                               [JGH]
      154       TIP Accounting                                     [JGH]
      155       Internet Protocol [regular]                  [33,77,JBP]
      156-158   Internet Protocol [experimental]             [33,77,JBP]
      159       Figleaf Link                                      [JBW1]
      160-195   Unassigned                                         [JBP]
      196-247   Experimental Protocols                             [JBP]
      248-255   Network Maintenance                                [JGH]

Reynolds & Postel                                              [Page 19]

Assigned Numbers                                                 RFC 923
IEEE 802 SAP Numbers

                    IEEE 802 SAP NUMBERS OF INTEREST

   Many of the networks of all classes are IEEE 802 Networks.  These
   systems use a Service Access Point field in much the same way the
   ARPANET uses the "link" field.  For further information and SAP
   number assignments, please contact: Mr. Maris Graube, Chairman, IEEE
   802, c/o Tektronix, P.O. Box 500, D/S 50-473, Beaverton,
   Oregon, 97077.


      Service Access Point               Description          References
      --------------------               -----------          ----------
      decimal  binary
         96   01100000                   DOD IP              [33,76,JBP]

Reynolds & Postel                                              [Page 20]

Assigned Numbers                                                 RFC 923
Ethernet Numbers

                      ETHERNET NUMBERS OF INTEREST

   Many of the networks of all classes are Ethernets (10Mb) or
   Experimental Ethernets (3Mb).  These systems use a message "type"
   field in much the same way the ARPANET uses the "link" field.

   If you need an Ethernet number, contact the XEROX Corporation, Office
   Products Division, Network Systems Administration Office, 333 Coyote
   Hill Road, Palo Alto, California, 94304.


      Ethernet          Exp. Ethernet    Description          References
      -------------     -------------   -----------           ----------
      decimal  Hex      decimal  octal
         512   0200        512   1000   XEROX PUP                [1,HGM]
        1536   0600       1536   3000   XEROX NS IDP           [109,LLG]
        2048   0800        513   1001   DOD IP               [33,77,JBP]
        2049   0801        -      -     X.75 Internet              [LLG]
        2050   0802        -      -     NBS Internet               [LLG]
        2051   0803        -      -     ECMA Internet              [LLG]
        2052   0804        -      -     Chaosnet                   [LLG]
        2053   0805        -      -     X.25 Level 3               [LLG]
        2054   0806        -      -     ARP                    [61,DCP1]
        2076   081C        -      -     Symbolics Private         [DCP1]
       32771   8003        -      -     Cronus VLN            [100,DT15]
       32772   8004        -      -     Cronus Direct         [100,DT15]
       32774   8006        -      -     Nestar                     [LLG]
       32784   8010        -      -     Excelan                    [---]
       32821   8035        -      -     Reverse ARP             [36,JCM]
       36864   9000        -      -     Loopback                   [LLG]

   The standard for transmission of IP datagrams over Ethernets and
   Experimental Ethernets is specified in RFC 894 [48] and RFC 895 [63]

Reynolds & Postel                                              [Page 21]

Assigned Numbers                                                 RFC 923
Address Resolution Protocol


   The Address Resolution Protocol (ARP) specified in RFC 826 [61] has
   several parameters.  The assigned values for these parameters are
   listed here.


      Operation Code (op)

         1   REQUEST
         2   REPLY

      Hardware Type (hrd)

         Type   Description                                   References
         ----   -----------                                   ----------
           1    Ethernet (10Mb)                                    [JBP]
           2    Experimental Ethernet (3Mb)                        [JBP]
           3    Amateur Radio AX.25                                [PXK]

      Protocol Type (pro)

         Use the same codes as listed in the section called "Ethernet
         Numbers of Interest".

Reynolds & Postel                                              [Page 22]

Assigned Numbers                                                 RFC 923
Public Data Network Numbers


   One of the Internet Class A Networks is the international system of
   Public Data Networks.  This section lists the mapping between the
   Internet Addresses and the Public Data Network Addresses (X.121).


      Internet           Public Data Net    Description       References
      ---------------   -----------------   -----------       ----------                       Reserved               [JBP]   3110-317-00035 00   PURDUE-TN              [CAK]   3110-608-00027 00   UWISC-TN               [CAK]   3110-302-00024 00   UDEL-TN                [CAK]   2342-192-00149 23   UCL-VTEST               [PK]   2342-192-00300 23   UCL-TG                  [PK]   2342-192-00300 25   UK-SATNET               [PK]   3110-608-00024 00   UWISC-IBM             [MHS1]   3110-213-00045 00   RAND-TN                [MO2]   2342-192-00300 23   UCL-CS                  [PK]   3110-617-00025 00   BBN-VAN-GW            [JD21]   2405-015-50300 00   CHALMERS               [UXB]   3110-713-00165 00   RICE                  [PAM6]   3110-415-00261 00   DECWRL                [PAM6]   3110-408-00051 00   IBM-SJ                 [SA1]   2041-117-01000 00   SHAPE                  [PG3]   2628-153-90075 00   DFVLR                 [HDC1]   3110-213-00032 00   ISI-VAN-GW            [JD21]       Unassigned             [JBP]                       Reserved               [JBP]

   The standard for transmission of IP datagrams over the Public Data
   Network is specified in RFC 877 [52].

Reynolds & Postel                                              [Page 23]

Assigned Numbers                                                 RFC 923
Telnet Options

                        ASSIGNED TELNET OPTIONS

   The Telnet Protocol has a number of options that may be negotiated.
   These options are listed here.  "Official ARPA-Internet
   Protocols" [89] provides more detailed information.

   Options  Name                                              References
   -------  -----------------------                           ----------
      0     Binary Transmission                                 [82,JBP]
      1     Echo                                                [83,JBP]
      2     Reconnection                                         [5,JBP]
      3     Suppress Go Ahead                                   [86,JBP]
      4     Approx Message Size Negotiation                     [34,JBP]
      5     Status                                              [85,JBP]
      6     Timing Mark                                         [87,JBP]
      7     Remote Controlled Trans and Echo                    [79,JBP]
      8     Output Line Width                                    [3,JBP]
      9     Output Page Size                                     [4,JBP]
     10     Output Carriage-Return Disposition                  [22,JBP]
     11     Output Horizontal Tab Stops                         [26,JBP]
     12     Output Horizontal Tab Disposition                   [25,JBP]
     13     Output Formfeed Disposition                         [23,JBP]
     14     Output Vertical Tabstops                            [28,JBP]
     15     Output Vertical Tab Disposition                     [27,JBP]
     16     Output Linefeed Disposition                         [24,JBP]
     17     Extended ASCII                                     [105,JBP]
     18     Logout                                              [19,MRC]
     19     Byte Macro                                          [29,JBP]
     20     Data Entry Terminal                                 [31,JBP]
     22     SUPDUP                                           [21,20,MRC]
     22     SUPDUP Output                                       [39,MRC]
     23     Send Location                                      [51,EAK1]
     24     Terminal Type                                      [97,MHS1]
     25     End of Record                                       [75,JBP]
    255     Extended-Options-List                               [81,JBP]

Reynolds & Postel                                              [Page 24]

Assigned Numbers                                                 RFC 923
Machine Names

                         OFFICIAL MACHINE NAMES

   These are the Official Machine Names as they appear in the NIC Host
   Table.  Their use is described in RFC 810 [35].


Reynolds & Postel                                              [Page 25]

Assigned Numbers                                                 RFC 923
Machine Names


Reynolds & Postel                                              [Page 26]

Assigned Numbers                                                 RFC 923
System Names

                         OFFICIAL SYSTEM NAMES

   These are the Official System Names as they appear in the NIC Host
   Table.  Their use is described in RFC 810 [35].


Reynolds & Postel                                              [Page 27]

Assigned Numbers                                                 RFC 923
Protocol Names


   These are the Official Protocol Names.  Their use is described in
   greater detail in RFC 810 [35].

   ARGUS               - ARGUS Protocol
   AUTH                - Authentication Service
   BBN-RCC-MON         - BBN RCC Monitoring
   BR-SAT-MON          - Backroom SATNET Monitoring
   CFTP                - CFTP
   CHAOS               - CHAOS Protocol
   CHARGEN             - Character Generator Protocol
   CLOCK               - DCNET Time Server Protocol
   CSNET-NS            - CSNET Mailbox Nameserver Protocol
   DAYTIME             - Daytime Protocol
   DCN-MEAS            - DCN Measurement Subsystems Protocol
   DCP                 - Device Control Protocol
   DISCARD             - Discard Protocol
   DOMAIN              - Domain Name Server
   ECHO                - Echo Protocol
   EGP                 - Exterior Gateway Protocol
   EMCON               - Emission Control Protocol
   FINGER              - Finger Protocol
   FTP                 - File Transfer Protocol
   GGP                 - Gateway Gateway Protocol
   GRAPHICS            - Graphics Protocol
   HMP                 - Host Monitoring Protocol
   HOST2-NS            - Host2 Name Server
   HOSTNAME            - Hostname Protocol
   ICMP                - Internet Control Message Protocol
   IGP                 - Interior Gateway Protocol
   IP                  - Internet Protocol
   IPCU                - Internet Packet Core Utility
   IPPC                - Internet Pluribus Packet Core
   ISI-GL              - ISI Graphics Language Protocol
   LA-MAINT            - IMP Logical Address Maintenance
   LEAF-1              - Leaf-1 Protocol
   LEAF-2              - Leaf-2 Protocol
   LINK                - Link Protocol
   LOGIN               - Login Host Protocol
   METAGRAM            - Metagram Relay
   MIT-ML-DEV          - MIT ML Device
   MIT-SUBNET          - MIT Subnet Support
   MIT-DOV             - MIT Dover Spooler
   MPM                 - Internet Message Protocol
   MPM-FLAGS           - MP Flags Protocol
   MSG-AUTH            - MSG Authentication Protocol
   MSG-ICP             - MSG ICP Protocol

Reynolds & Postel                                              [Page 28]

Assigned Numbers                                                 RFC 923
Protocol Names

   MUX                 - Multiplexing Protocol
   NAMESERVER          - Host Name Server
   NETED               - Network Standard Text Editor
   NETRJS              - Remote Job Service
   NI-FTP              - NI File Transfer Protocol
   NI-MAIL             - NI Mail Protocol
   NICNAME             - Who Is Protocol
   NSW-FE              - NSW User System Front End
   NVP-II              - Network Voice Protocol
   POP                 - Post Office Protocol
   PRM                 - Packet Radio Measurement
   PUP                 - PUP Protocol
   QUOTE               - Quote of the Day Protocol
   RDP                 - Reliable Data Protocol
   RJE                 - Remote Job Entry
   RLP                 - Resource Location Protocol
   RTELNET             - Remote Telnet Service
   RVD                 - Remote Virtual Disk Protocol
   SAT-EXPAK           - Satnet and Backroom EXPAK
   SAT-MON             - SATNET Monitoring
   SFTP                - Simple File Transfer Protocol
   SMTP                - Simple Mail Transfer Protocol
   ST                  - Stream Protocol
   SU-MIT-TG           - SU/MIT Telnet Gateway Protocol
   SUNRPC              - SUN Remote Procedure Call
   SUPDUP              - SUPDUP Protocol
   SUR-MEAS            - Survey Measurement
   SWIFT-RVF           - Remote Virtual File Protocol
   TCP                 - Transmission Control Protocol
   TELNET              - Telnet Protocol
   TFTP                - Trivial File Transfer Protocol
   TIME                - Time Server Protocol
   TRUNK-1             - Trunk-1 Protocol
   TRUNK-2             - Trunk-2 Protocol
   UCL                 - University College London Protocol
   UDP                 - User Datagram Protocol
   USERS               - Active Users Protocol
   UUCP-PATH           - UUCP Path Service
   VIA-FTP             - VIA Systems-File Transfer Protocol
   WB-EXPAK            - Wideband EXPAK
   WB-MON              - Wideband Monitoring
   XNET                - Cross Net Debugger
   XNS-IDP             - Xerox NS IDP

Reynolds & Postel                                              [Page 29]

Assigned Numbers                                                 RFC 923
Terminal Type Names

                      OFFICIAL TERMINAL TYPE NAMES

   These are the Official Terminal Type Names.  Their use is described
   in RFC 884 [97].


Reynolds & Postel                                              [Page 30]

Assigned Numbers                                                 RFC 923
Terminal Type Names


Reynolds & Postel                                              [Page 31]

Assigned Numbers                                                 RFC 923
Terminal Type Names


Reynolds & Postel                                              [Page 32]

Assigned Numbers                                                 RFC 923
Terminal Type Names


Reynolds & Postel                                              [Page 33]

Assigned Numbers                                                 RFC 923


   [1]    Accetta, Mike, "Resource Location Protocol", RFC 887,
          Carnegie-Mellon University, December 1983.

   [2]    Aerospace, Internal Report, ATM-83(3920-01)-3, 1982.

   [3]    ARPANET Protocol Handbook, "Telnet Output Line Width Option",
          NIC 20196, November 1973.

   [4]    ARPANET Protocol Handbook, "Telnet Output Page Size Option",
          NIC 20197, November 1973.

   [5]    ARPANET Protocol Handbook, "Telnet Reconnection Option",
          NIC 15391, August 1973.

   [6]    BBN Proposal No. P83-COM-40, "Packet Switched Overlay to
          Tactical Multichannel/Satellite Systems".

   [7]    BBN, "Specifications for the Interconnection of a Host and an
          IMP", Report 1822, Bolt Beranek and Newman, Cambridge,
          Massachusetts, revised, December 1981.

   [8]    Bennett, C., "A Simple NIFTP-Based Mail System", IEN 169,
          University College, London, January 1981.

   [9]    Bhushan, A., "A Report on the Survey Project", RFC 530,
          NIC 17375, June 1973.

   [10]   Bisbey, R., D. Hollingworth, and B. Britt, "Graphics Language
          (version 2.1)", ISI/TM-80-18, USC/Information Sciences
          Institute, July 1980.

   [11]   Boggs, D., J. Shoch, E. Taft, and R. Metcalfe, "PUP: An
          Internetwork Architecture", XEROX Palo Alto Research Center,
          CSL-79-10, July 1979; also in IEEE Transactions on
          Communication, Volume COM-28, Number 4, April 1980.

   [12]   Braden, R., "NETRJS Protocol", RFC 740, NIC 42423,
          November 1977.

   [13]   Bressler, B., "Remote Job Entry Protocol",  RFC 407, NIC
          12112, October 72.

   [14]   Bressler, R., "Inter-Entity Communication -- An Experiment",
          RFC 441, NIC 13773, January 1973.

Reynolds & Postel                                              [Page 34]

Assigned Numbers                                                 RFC 923

   [15]   Clark, D., "Revision of DSP Specification", Local Network
          Note 9, Laboratory for Computer Science, MIT, June 1977.

   [16]   Cohen, D., "Specifications for the Network Voice Protocol",
          RFC 741, ISI/RR 7539, USC/Information Sciences Institute,
          March 1976.

   [17]   Cohen, D. and J. Postel, "Multiplexing Protocol", IEN 90,
          USC/Information Sciences Institute, May 1979.

   [18]   COMPASS, "Semi-Annual Technical Report", CADD-7603-0411,
          Massachusetts Computer Associates, 4 March 1976. Also as,
          "National Software Works, Status Report No. 1,"
          RADC-TR-76-276, Volume 1, September 1976. And COMPASS. "Second
          Semi-Annual Report," CADD-7608-1611, Massachusetts Computer
          Associates, August 1976.

   [19]   Crispin, Mark, "Telnet Logout Option", Stanford University-AI,
          RFC 727, April 1977.

   [20]   Crispin, Mark, "Telnet SUPDUP Option", Stanford University-AI,
          RFC 736, October 1977.

   [21]   Crispin, M., "SUPDUP Protocol", RFC 734, NIC 41953,
          October 1977.

   [22]   Crocker, D., "Telnet Output Carriage-Return Disposition
          Option", RFC 652, October 1974.

   [23]   Crocker, D., "Telnet Output Formfeed Disposition Option",
          RFC 655, October 1974.

   [24]   Crocker, D., "Telnet Output Linefeed Disposition", RFC 658,
          October 1974.

   [25]   Crocker, D., "Telnet Output Horizontal Tab Disposition
          Option", RFC 654,

   [26]   Crocker, D., "Telnet Output Horizontal Tabstops Option",
          RFC 653, October 1974.

   [27]   Crocker, D., "Telnet Output Vertical Tab Disposition Option",
          RFC 657, October 1974.

   [28]   Crocker, D., "Telnet Output Vertical Tabstops Option",
          RFC 656, October 1974.

Reynolds & Postel                                              [Page 35]

Assigned Numbers                                                 RFC 923

   [29]   Crocker, D.H. and R.H. Gumpertz, "Revised Telnet Byte Marco
          Option", RFC 735, November 1977.

   [30]   Croft, W. J., "Unix Networking at Purdue", USENIX Conference,

   [31]   Day, John, "Telnet Data Entry Terminal Option", RFC 732,
          September 1977.

   [32]   Elvy, Marc A., "UUCP Path Service", RFC 915, Harvard
          University, October 1984.

   [33]   Feinler, E., "Internet Protocol Transition Workbook", Network
          Information Center, SRI International, March 1982.

   [34]   Feinler, E. and J. Postel, eds., "ARPANET Protocol Handbook",
          NIC 7104, for the Defense Communications Agency by SRI
          International, Menlo Park, California, Revised January 1978.

   [35]   Feinler, E., K. Harrenstien, and Z. Su, "DoD Internet Host
          Table Specification", RFC 810, SRI International, March 1982.

   [36]   Finlayson, R., T. Mann, J. Mogul, and M. Theimer, "A Reverse
          Address Resolution Protocol", RFC 903, Stanford University,
          June 1984.

   [37]   Forgie, J., "ST - A Proposed Internet Stream Protocol",
          IEN 119, M.I.T. Lincoln Laboratory, September 1979.

   [38]   Forsdick, H., "CFTP", Network Message, Bolt Beranek and
          Newman, January 1982.

   [39]   Greenberg, B., "Telnet SUPDUP-OUTPUT Option", RFC 749,
          MIT-Multics, September 1978.

   [40]   Harrenstien, K., "Name/Finger", RFC 742, NIC 42758,
          December 1977.

   [41]   Harrenstien, K., V. White, and E. Feinler, "Hostnames Server",
          RFC 811, SRI International, March 1982.

   [42]   Harrenstien, K., and V. White, "Nicname/Whois", RFC 812, SRI
          International, March 1982.

   [43]   Haverty, J., "XNET Formats for Internet Protocol Version 4",
          IEN 158, October 1980.

Reynolds & Postel                                              [Page 36]

Assigned Numbers                                                 RFC 923

   [44]   Hinden, Robert M., "A Host Monitoring Protocol", RFC 869, Bolt
          Beranek and Newman, December 1983.

   [45]   Hinden, R., and A. Sheltzer, "The DARPA Internet Gateway",
          RFC 823, September 1982.

   [46]   Honeywell CISL, Internal Document, "AFSDSC Hyperchannel RPQ
          Project Plan".

   [47]   Honeywell CISL, Internal Document, "Multics MR11 PFS".

   [48]   Hornig, C., "A Standard for the Transmission of IP Datagrams
          over Ethernet Networks, RFC 894, Symbolics, April 1984.

   [49]   Hwang, Kai, W. J. Croft and G. H. Goble, "A Unix-Based Local
          Computer Network with Load Balancing", IEEE Computer,
          April 1982.

   [50]   IBM Corporation, "Technical Reference Manual for the IBM PC
          Network", 6322505, IBM, Boca Raton, Florida, 1984.

   [51]   Killian, E., "Telnet Send-Location Option", RFC 779,
          April 1981.

   [52]   Korb, John T., "A Standard for the Transmission of IP
          Datagrams Over Public Data Networks", RFC 877, Purdue
          University, September 1983.

   [53]   Leffler, Samuel J., et al., "4.2bsd Network Implementation
          Notes", University of California, Berkeley, July 1983.

   [54]   Lottor, Mark K., "Simple File Transfer Protocol", RFC 913,
          M.I.T., September 1984.

   [55]   Macgregor, W., and D. Tappan, "The CRONUS Virtual Local
          Network", RFC 824, Bolt Beranek and Newman, August 1982.

   [56]   Malis, Andrew G.  "The ARPANET 1822L Host Access Protocol",
          RFC 878, BBN-CC, Cambridge, December 1983.

   [57]   Malis, A., "Logical Addressing Implementation Specification",
          BBN Report 5256, pp 31-36, May 1983.

   [58]   Metcalfe, R.M. and D.R. Boggs, "Ethernet: Distributed Packet
          Switching for Local Computer Networks", Communications of the
          ACM, 19 (7), pp 395-402, July 1976.

Reynolds & Postel                                              [Page 37]

Assigned Numbers                                                 RFC 923

   [59]   Mills, D., "DCN Local Network Protocols", RFC 891, Linkabit,
          December 1983.

   [60]   NSW Protocol Committee, "MSG: The Interprocess Communication
          Facility for the National Software Works", CADD-7612-2411,
          Massachusetts Computer Associates, BBN 3237, Bolt Beranek and
          Newman, Revised December 1976.

   [61]   Plummer, D., "An Ethernet Address Resolution Protocol or
          Converting Network Protocol Addresses to 48-bit Ethernet
          Addresses for Transmission on Ethernet Hardware", RFC 826,
          MIT-LCS, November 1982.

   [62]   Postel, J., "Active Users", RFC 866, USC/Information Sciences
          Institute, May 1983.

   [63]   Postel, J., "A Standard for the Transmission of IP Datagrams
          over Experimental Ethernet Networks, RFC 895, USC/Information
          Sciences Institute, April 1984.

   [64]   Postel, J., "Character Generator Protocol", RFC 864,
          USC/Information Sciences Institute, May 1983.

   [65]   Postel, J., "Daytime Protocol", RFC 867, USC/Information
          Sciences Institute, May 1983.

   [66]   Postel, J., "Discard Protocol", RFC 863, USC/Information
          Sciences Institute, May 1983.

   [67]   Postel, J., "Echo Protocol", RFC 862, USC/Information Sciences
          Institute, May 1983.

   [68]   Postel, J., "File Transfer Protocol", RFC 765, IEN 149,
          USC/Information Sciences Institute, June 1980.

   [69]   Postel, J., "Internet Control Message Protocol - DARPA
          Internet Program Protocol Specification", RFC 792,
          USC/Information Sciences Institute, September 1981.

   [70]   Postel, J., "Internet Message Protocol", RFC 759, IEN 113,
          USC/Information Sciences Institute, August 1980.

   [71]   Postel, J., "Name Server", IEN 116, USC/Information Sciences
          Institute, August 1979.

   [72]   Postel, J., "Quote of the Day Protocol", RFC 865,
          USC/Information Sciences Institute, May 1983.

Reynolds & Postel                                              [Page 38]

Assigned Numbers                                                 RFC 923

   [73]   Postel, J., "Remote Telnet Service", RFC 818, USC/Information
          Sciences Institute, November 1982.

   [74]   Postel, J., "Simple Mail Transfer Protocol", RFC 821,
          USC/Information Sciences Institute, August 1982.

   [75]   Postel, J., "Telnet End of Record Option", RFC 885,
          USC/Information Sciences Institute, December 1983.

   [76]   Postel, J., "User Datagram Protocol", RFC 768 USC/Information
          Sciences Institute, August 1980.

   [77]   Postel, J., ed., "Internet Protocol - DARPA Internet Program
          Protocol Specification", RFC 791, USC/Information Sciences
          Institute, September 1981.

   [78]   Postel, J., ed., "Transmission Control Protocol - DARPA
          Internet Program Protocol Specification", RFC 793,
          USC/Information Sciences Institute, September 1981.

   [79]   Postel, J. and D. Crocker, "Remote Controlled Transmission and
          Echoing Telnet Option", RFC 726, March 1977.

   [80]   Postel, J., and K. Harrenstien, "Time Protocol", RFC 868,
          USC/Information Sciences Institute, May 1983.

   [81]   Postel, J. and J. Reynolds, "Telnet Extended Options - List
          Option", RFC 861, USC/Information Sciences Institute,
          May 1983.

   [82]   Postel, J. and J. Reynolds, "Telnet Binary Transmission",
          RFC 856, USC/Information Sciences Institute, May 1983.

   [83]   Postel, J. and J. Reynolds, "Telnet Echo Option", RFC 857,
          USC/Information Sciences Institute, May 1983.

   [84]   Postel, J., and J. Reynolds, "Telnet Protocol Specification",
          RFC 854, USC/Information Sciences Institute, May 1983.

   [85]   Postel, J. and J. Reynolds, "Telnet Status Option", RFC 859,
          USC/Information Sciences Institute, May 1983.

   [86]   Postel, J. and J. Reynolds, "Telnet Suppress Go Ahead Option",
          RFC 858, USC/Information Sciences Institute, May 1983.

   [87]   Postel, J. and J. Reynolds, "Telnet Timing Mark Option",
          RFC 860, USC/Information Sciences Institute, May 1983.

Reynolds & Postel                                              [Page 39]

Assigned Numbers                                                 RFC 923

   [88]   Reed, D., "Protocols for the LCS Network", Local Network Note
          3, Laboratory for Computer Science, MIT, November 1976.

   [89]   Reynolds, J. and J. Postel, "Official ARPA-Internet
          Protocols", RFC 924, USC/Information Sciences Institute,
          October 1984.

   [90]   Rosen, E., "Exterior Gateway Protocol" RFC 827, Bolt Beranek
          and Newman, October 1982.

   [91]   Saltzer, J.H., "Design of a Ten-megabit/sec Token Ring
          Network", MIT Laboratory for Computer Science Technical

   [92]   Scott, Walter S., "2.9bsd/TIS Network Implementation",
          Lawrence Livermore National Laboratory, September 1984.

   [93]   Seamonson, L.J., and E.C. Rosen, "STUB" Exterior Gateway
          Protocol", RFC 888, BBN Communications Corporation,
          January 1984.

   [94]   Skelton, A., S. Holmgren, and D. Wood, "The MITRE Cablenet
          Project", IEN 96, April 1979.

   [95]   Sollins, K., "The TFTP Protocol (Revision 2)", RFC 783,
          MIT/LCS, June 1981.

   [96]   Solomon, M., L. Landweber, and D. Neuhengen, "The CSNET Name
          Server", Computer Networks, v.6, n.3, pp. 161-172, July 1982.

   [97]   Solomon, M., and E. Wimmers, "Telnet Terminal Type Option",
          RFC 884, University of Wisconsin, Madison, December 1983.

   [98]   Sproull, R., and E. Thomas, "A Networks Graphics Protocol",
          NIC 24308, August 1974.

   [99]   StJohns, Mike, "Authentication Service", RFC 912, TPSC,
          September 1984.

   [100]  Tappan, D.C., "The CRONUS Virtual Local Network", RFC 824,
          Bolt Beranek and Newman, Inc., August 1982.

   [101]  "The Ethernet, a Local Area Network: Data Link Layer and
          Physical Layer Specification", AA-K759B-TK, Digital Equipment
          Corporation, Maynard, MA.

Reynolds & Postel                                              [Page 40]

Assigned Numbers                                                 RFC 923

   [102]  "The Ethernet - A Local Area Network", Version 1.0, Digital
          Equipment Corporation, Intel Corporation, Xerox Corporation,
          September 1980.

   [103]  "The Ethernet, A Local Area Network: Data Link Layer and
          Physical Layer Specifications", Digital, Intel and Xerox,
          November 1982.

   [104]  The High Level Protocol Group, "A Network Independent File
          Transfer Protocol",  INWG Protocol Note 86, December 1977.

   [105]  Tovar, "Telnet Extended ASCII Option", RFC 698, Stanford
          University-AI, July 1975.

   [106]  Velten, David, Robert Hinden, and Jack Sax, "Reliable Data
          Protocol", RFC 908, BBN Communications Corporation, July 1984.

   [107]  Whelan, D., "The Caltech Computer Science Department Network",
          5052:DF:82, Caltech Computer Science Department, 1982.

   [108]  XEROX, "The Ethernet, A Local Area Network: Data Link Layer
          and Physical Layer Specification", X3T51/80-50, Xerox
          Corporation, Stamford, CT., October 1980.

   [109]  XEROX, "Internet Transport Protocols",  XSIS 028112, Xerox
          Corporation, Stamford, Connecticut, December 1981.

   [110]  Reynolds, J., "Post Office Protocol",  RFC 918,
          USC/Information Sciences Institute, October 1984.

Reynolds & Postel                                              [Page 41]

Assigned Numbers                                                 RFC 923


   [AB13]    Alison Brown        CORNELL   [email protected]
   [AD22]    Arlene DesJardins   CIT       [email protected]
   [AG22]    Alfred Ganz         YALE      [email protected]
   [AGM]     Andy Malis          BBN       [email protected]
   [AL6]     Alexis Layton       CCA       [email protected]
   [APS]     Anita Skelton       MITRE     [email protected]
   [AP]      Alan Parker         NRL       [email protected]
   [AV]      Al Vezza            MIT       [email protected]
   [AW9]     Albert Wong         NPS       [email protected]
   [AXC]     Albert Cheng        UIUC      [email protected]
   [AXG]     Atul Garg           HP        ---none---
   [AY5]     Akiharu Yasuda      DODIIS    [email protected]
   [BC14]    Robert Cattani      Columbia  [email protected]
   [BG5]     Bob Gilligan        SRI       [email protected]
   [BIM]     Benson I. Margulies Honeywell [email protected]
   [BJN1]    Bruce Nemnich       TMC       [email protected]
   [BML]     Barry Leiner        ARPA      [email protected]
   [BN7]     Bich T. Nguyen      SRI       [email protected]
   [BN9]     Bill Nesheim        CORNELL   [email protected]
   [BP17]    Bobbi Phillips      SRI       [email protected]
   [BXA]     Bobby W. Allen      YPG       [email protected]
   [CAK]     Chris Kent          PURDUE    [email protected]
   [CBP]     Brian Pinkerton     Wisconson [email protected]
   [CC2]     Chase Cotton        UDEL      [email protected]
   [CH2]     Charles Hornig      Symbolics [email protected]
   [CJW2]    Cliff Weinstein     LL        [email protected]
   [CLH3]    Charles Hedrick     RUTGERS   [email protected]
   [CMR]     Craig Rogers        ISI       [email protected]
   [CP10]    Craig Partridge     BBN       [email protected]
   [CXL]     Clifford A. Lynch   UCB       [email protected]
   [DAM1]    David A. Mosher     UCB       [email protected]
   [DCP1]    David Plummer       MIT       [email protected]
   [DT15]    Dan Tappan          BBN       [email protected]
   [DDC2]    Dave Clark          MIT-LCS   [email protected]
   [DG28]    David L. Gehrt      RIACS     [email protected]
   [DH17]    Douglas Hirsch      BBN       [email protected]
   [DHH]     Doug Hunt           BBN       [email protected]
   [DJF]     David J. Farber     U of Del. [email protected]
   [DJV1]    Darrel J. Van Buer  SDC       [email protected]
   [DK2]     Dean B. Krafft      CORNELL   [email protected]
   [DLM1]    David Mills         LINKABIT  [email protected]
   [DM11]    Dale McNeill        BBN       [email protected]
   [DPR]     David Reed          MIT-LCS   [email protected]
   [DSW]     Dan Whelan          Caltech   [email protected]
   [DXD]     Dennis J.W. Dube    VIA Systems ---none---
   [DXG]     David Goldberg      SMI       [email protected]

Reynolds & Postel                                              [Page 42]

Assigned Numbers                                                 RFC 923

   [EAK1]    Earl Killian        LLL       [email protected]
   [EBM]     Eliot Moss          MIT       [email protected]
   [EC5]     Ed Cain             DCEC      [email protected]
   [EF5]     Ed Franceschini     NYU       [email protected]
   [EHP]     Ed Perry            SRI       [email protected]
   [FAS]     Fred Segovich       Compion   [email protected]
   [FLM2]    F. Lee Maybaum      MILNET    Maybaum@DDN1
   [GEOF]    Geoff Goodfellow    SRI       [email protected]
   [GC]      Graham Campbell     BNL       [email protected]
   [GG11]    George Goble        Purdue    [email protected]
   [GH29]    Gregory Hidley      UCSD      [email protected]
   [GIH]     Glenn I. Hastie II  SRI       [email protected]
   [GP10]    George Pavel        LLNL      [email protected]
   [GXL]     Guillermo A. Loyola IBM      Loyola%[email protected]
   [HA]      Howard Alt          AIDS      [email protected]
   [HCF2]    Harry Forsdick      BBN       [email protected]
   [HDC1]    Horst Clausen       DFVLR     [email protected]
   [HDW2]    Howard Wactlar      CMU       [email protected]
   [HGM]     Hallam Murray       PARC      [email protected]
   [HM]      Hank Magnuski       ---       [email protected]
   [JA1]     Jules P. Aronson    NLM       [email protected]
   [JAKE]    Jake Feinler        SRI       [email protected]
   [JAR4]    Jim Rees            WASHINGTON [email protected]
   [JAW3]    Jil Westcott        BBN       [email protected]
   [JBP]     Jon Postel          ISI       [email protected]
   [JBW1]    Joseph Walters, Jr. BBN       [email protected]
   [JC11]    Jim Clifford        LANL      [email protected]
   [JCM]     Jeff Mogul          STANFORD  [email protected]
   [JD21]    Jonathan Dreyer     BBN       [email protected]
   [JDG]     Jim Guyton          RAND      [email protected]
   [JEM]     Jim Mathis          SRI       [email protected]
   [JFH2]    Jack Haverty        BBN       Hav[email protected]
   [JGH]     Jim Herman          BBN       [email protected]
   [JG46]    Jonathan Goodman    YALE      [email protected]
   [JKR1]    Joyce K. Reynolds   ISI       [email protected]
   [JN2]     Jose Nabielsky      MITRE     [email protected]
   [JO5]     John O'Donnell      YALE      [email protected]
   [JR17]    John L. Robinson    CANADA    [email protected]
   [JRM1]    John Mullen         MITRE     [email protected]
   [JRS8]    Jeffrey R. Schwab   PURDUE    [email protected]
   [JS38]    Joseph Sventek      LBL       [email protected]
   [JSG5]    Jon Goodridge       BBN       [email protected]
   [JSQ1]    John S. Quarterman  UT        [email protected]
   [JWF]     Jim Forgie          LL        [email protected]
   [JWO1]    James W. O'Toole    UMD       [email protected]
   [KCS1]    Kevin C. Smallwood  PURDUE    [email protected]
   [KLH]     Ken Harrenstien     SRI       [email protected]
   [KRS]     Karen Sollins       MIT       [email protected]

Reynolds & Postel                                              [Page 43]

Assigned Numbers                                                 RFC 923

   [KTP]     Kenneth T. Pogran   BBN       [email protected]
   [KWP]     Kevin W. Paetzold   DEC       [email protected]
   [LB1]     Liudvikas Bukys     ROCHESTER [email protected]
   [LCN]     Lou Nelson          AEROSPACE [email protected]
   [LCS]     Lou Schreier        SRI       [email protected]
   [LH2]     Lincoln Hu          COLUMBIA  [email protected]
   [LLG]     Larry Garlick       XEROX     [email protected]
   [LOU]     Lou Salkind         NYU       [email protected]
   [LM8]     Liza Martin         MIT-LCS   [email protected]
   [LRB]     Larry Bierma        NPRDC     [email protected]
   [MA]      Mike Accetta        CMU       [email protected]
   [MAB4]    Mark Brown          USC       [email protected]
   [MAE]     Marc A. Elvy        Harvard   [email protected]
   [MBG]     Michael Greenwald   MIT-LCS   [email protected]
   [MB]      Michael Brescia     BBN       [email protected]
   [MCSJ]    Mike StJohns        AFDSC     [email protected]
   [MDC]     Martin D. Connor    MIT AI    [email protected]
   [MF31]    Martin J. Fouts     NASA-Ames [email protected]
   [MH12]    Mark Horton         ATT       [email protected]
   [MHS1]    Marvin Solomon      WISC      [email protected]
   [MJM2]    Mike Muuss          BRL       [email protected]
   [MK17]    Mike Karels         UCB       [email protected]
   [MO2]     Michael O'Brien     RAND      [email protected]
   [MO14]    Michael O'Donnel    JHU       Odonnel%[email protected]
   [MRC]     Mark Crispin        Stanford  [email protected]
   [MS9]     Martin Schoffstall  CADMUS    [email protected]
   [MTR]     Marshall Rose       Irvine    [email protected]
   [MXL]     Mark Lottor         MIT       [email protected]
   [MXM]     Marc M. Meilleur    COINS     [email protected]
   [MXP]     Michael K. Peterson HUGHES    [email protected]
   [MXR]     Mark A. Rosenstein  MIT       [email protected]
   [MXS]     Marc Shapiro        INRIA     [email protected]
   [NC3]     J. Noel Chiappa     MIT       [email protected]
   [NMM]     Mike Minnich        UDELEE    [email protected]
   [NXK]     Neil Katin          HP        [email protected]
   [PA5]     Philip Almquist     Stanford  [email protected]
   [PAM6]    Paul McNabb         RICE      [email protected]
   [PG3]     Phill Gross         LINKABIT  [email protected]
   [PGM]     Paul G. Milazzo     RICE      [email protected]
   [PHD1]    Pieter Ditmars      BBN       [email protected]
   [PK]      Peter Kirstein      UCL       [email protected]
   [PM1]     Paul Mockapetris    ISI       [email protected]
   [PM4]     Paul Martin         SRI       [email protected]
   [PS3]     Paal Spilling       NDRE      [email protected]
   [PXA]     Phillip G. Apley    Bitstream [email protected]
   [PXB]     Pat Boyle           UBC       [email protected]
   [PXK]     Philip R. Karn, Jr. BCR       [email protected]
   [PXM]     Pat Marques         NSRDC     [email protected]

Reynolds & Postel                                              [Page 44]

Assigned Numbers                                                 RFC 923

   [PXN]     Peter Nellessen     SIEMENS   [email protected]
   [RA11]    Rick Adams          CCI       [email protected]
   [RB6]     Richard Bisbey      ISI       [email protected]
   [RBN1]    Ronald Natalie, Jr. BRL       [email protected]
   [RBW]     Richard B. Wales    UCLA      [email protected]
   [RC7]     Robert Cole         UCL       [email protected]
   [RDB2]    Robert Bressler     BBN       [email protected]
   [RDR4]    Dennis Rockwell     BBN       [email protected]
   [REK2]    Robert Kahn         ARPA      [email protected]
   [RF1]     Randy Frank         UTAH      [email protected]
   [RFD1]    Robert F. Donnelly  ARDC      [email protected]
   [RH6]     Robert Hinden       BBN       [email protected]
   [RH60]    Roger Hale          MIT       Network%[email protected]
   [RHT]     Robert Thomas       BBN       [email protected]
   [RK1]     Richard Kovalcik    Honeywell [email protected]
   [RKJ2]    Richard Johnsson    DEC       [email protected]
   [RLB1]    Bob Brown           USRA      [email protected]
   [RLB3]    Ronald L. Broersma  NOSC      [email protected]
   [RLH2]    Ronald L. Hartung   NSWC      [email protected]
   [RLS6]    Ronald L. Smith     COINS     [email protected]
   [RNM1]    Neil MacKenzie      RSRE      [email protected]
   [RR2]     Raleigh Romine      Teledyne  [email protected]
   [RR18]    Ron Reisor          UDEL      [email protected]
   [RS23]    Russel Sandberg     WISC      [email protected]
   [RTB]     Bob Braden          UCLA      [email protected]
   [RWS4]    Robert W. Scheifler ARGUS     [email protected]
   [SA1]     Sten Andler         ARPA     [email protected]
   [SC3]     Steve Casner        ISI       [email protected]
   [SGC]     Steve Chipman       BBN       [email protected]
   [SK]      Steve Kille         UCL       [email protected]
   [SM6]     Sean McLinden       DSL       [email protected]
   [SMF]     Steven M. Feldman   TYMNET    feldman%[email protected]
   [SXB]     Steve Byrne         TARTAN    [email protected]
   [SXB1]    Scott Bradner       HARVARD   [email protected]
   [SXM]     Scott Marcus        Spartacus ---none---
   [TBS]     Claude S. Steffey   WSMR      [email protected]
   [TC4]     Tony Cincotta       DTNSRDC   [email protected]
   [TF6]     Thomas Ferrin       UCSF      [email protected]
   [TW11]    Tom Wadlow          LLL       [email protected]
   [TXN]     Todd Nugent         U Chicago [email protected]
   [UXB]     Ulf Bilting         CHALMERS  [email protected]
   [WG]      Wayne Graves        LBL       [email protected]
   [WIM]     William Macgregor   BBN       [email protected]
   [WNJ]     Bill Joy            SMI       [email protected]
   [WXL]     William Lampeter    UR        [email protected]
   [ZSU]     Zaw-Sing Su         SRI       [email protected]

Reynolds & Postel                                              [Page 45]

Assigned Numbers                                                 RFC 923
Appendix A

                               APPENDIX A

   Network Numbers

      The network numbers in class A, B, and C network addresses are
      allocated among Research, Defense, Government (Non-Defense) and
      Commercial uses.

      Class A (highest-order bit 0)

         Research allocation:             8
         Defense allocation:             24
         Government allocation:          24
         Commercial allocation:          94
         Reserved Addresses:   (0, 127)
         Total                          128

      Class B (highest-order bits 1-0)

         Research allocation:          1024
         Defense allocation:           3072
         Government allocation:        3072
         Commercial allocation:       12286
         Reserved Addresses: (0, 16383)
         Total                        16384

      Class C (highest-order bits 1-1-0)

         Research allocation:           65536
         Defense allocation:           458725
         Government allocation:        458725
         Commercial allocation:       1572862
         Reserved Addresses: (0, 2097151)
         Total                        2097152

      Class D (highest-order bits 1-1-1)

         All addresses in this class are reserved for future use.

      Within the Research community, network identifiers will only be
      granted to applicants who show evidence that they are acquiring
      standard Bolt Beranek and Newman gateway software or have
      implemented or are acquiring a gateway meeting the Exterior
      Gateway Protocol requirements.  Acquisition of the Berkeley BSD
      4.2 UNIX software might be considered evidence of the latter.

Reynolds & Postel                                              [Page 46]

Assigned Numbers                                                 RFC 923
Appendix A

      Experimental networks which later become operational need not be
      renumbered.  Rather, the identifiers could be moved from Research
      to Defense, Government or Commercial status.  Thus, network
      identifiers may change state among Research, Defense, Government
      and Commercial, but the number of identifiers allocated to each
      use must remain within the limits indicated above.  To make
      possible this fluid assignment, the network identifier spaces are
      not allocated by simple partition, but rather by specific

   Protocol Identifiers

      These assignments are shared by the four communities.

   Port Numbers

      These assignments are shared by the four communities.

   ARPANET Link Numbers

      These assignments are shared by the four communities.

   IP Version Numbers

      These assignments are shared by the four communities.

   TCP, IP and Telnet Option Identifiers

      These assignments are shared by the four communities.


      Joyce Reynolds is the coordinator for all number assignments.

Reynolds & Postel                                              [Page 47]