RFC 3492

Punycode: A Bootstring encoding of Unicode for Internationalized Domain Names in Applications (IDNA), March 2003

Canonical URL:
https://www.rfc-editor.org/rfc/rfc3492.txt
File formats:
Plain TextPDF
Status:
PROPOSED STANDARD
Updated by:
RFC 5891
Author:
A. Costello
Stream:
IETF
Source:
idn (int)

Cite this RFC: TXT  |  XML

DOI:  10.17487/RFC3492

Discuss this RFC: Send questions or comments to iesg@ietf.org

Other actions: Find Errata (if any)  |  Submit Errata  |  Find IPR Disclosures from the IETF


Abstract

Punycode is a simple and efficient transfer encoding syntax designed for use with Internationalized Domain Names in Applications (IDNA). It uniquely and reversibly transforms a Unicode string into an ASCII string. ASCII characters in the Unicode string are represented literally, and non-ASCII characters are represented by ASCII characters that are allowed in host name labels (letters, digits, and hyphens). This document defines a general algorithm called Bootstring that allows a string of basic code points to uniquely represent any string of code points drawn from a larger set. Punycode is an instance of Bootstring that uses particular parameter values specified by this document, appropriate for IDNA. [STANDARDS-TRACK]


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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