UTF-6 - Yet Another ASCII-Compatible Encoding for IDN

Document Type Expired Internet-Draft (idn WG)
Authors Mark Welter  , Brian Spolarich 
Last updated 2000-11-21
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
Consensus Boilerplate Unknown
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes a tranformation method for representing Unicode character codepoints in host name parts in a fashion that is completely compatible with the current Domain Name System. It is proposed as a potential candidate for an ASCII-Compatible Encoding (ACE) for supporting the deployment of an internationalized Domain Name System. The tranformation method, an extension of the UTF-5 encoding proposed by Duerst, provides both for more efficient representation of typical Unicode sequences while preserving simplicity and readability. This transformation method is deployed as part of the current WALID multilingual domain name system implementation, although that status should not necessarily influence the evaluation of its merits as a candidate encoding method.


Mark Welter (mwelter@walid.com)
Brian Spolarich (briansp@ans.net)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)