Internationalizing Domain Names in Applications (IDNA): Protocol

Document Type Replaced Internet-Draft (individual in app area)
Author John Klensin 
Last updated 2015-10-14 (latest revision 2008-02-07)
Replaced by RFC 5891
Stream IETF
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state (None)
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-idnabis-protocol
Consensus Boilerplate Unknown
Telechat date
Responsible AD Chris Newman
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document supplies the protocol definition for a revised and updated specification for internationalized domain names (IDNs). The rationale for these changes, the relationship to the older specification, and important terminology are provided in other documents. This document specifies the protocol mechanism, called Internationalizing Domain Names in Applications (IDNA), for registering and looking up IDNs in a way that does not require changes to the DNS itself. IDNA is only meant for processing domain names, not free text.


John Klensin (

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