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Internationalized Domain Names in Applications (IDNA): Protocol (RFC5891) Disclosure Number: IPCOM000198349D
Original Publication Date: 2010-Aug-01
Included in the Prior Art Database: 2010-Aug-05
Document File: 34 page(s) / 38K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Klensin: AUTHOR


This document supplies the protocol definition for Internationalized Domain Names in Applications (IDNA), with the version specified here known as IDNA2008. Essential definitions and terminology for understanding this document and a road map of the collection of documents that make up IDNA2008 appear in a separate Definitions document [RFC5890]. Appendix A discusses the relationship between this specification and the earlier version of IDNA (referred to here as "IDNA2003"). The rationale for these changes, along with considerable explanatory material and advice to zone administrators who support IDNs, is provided in another document, known informally in this series as the "Rationale document" [RFC5894].

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Internet Engineering Task Force (IETF)                        J. Klensin Request for Comments: 5891                                   August 2010 Obsoletes: 3490, 3491 Updates: 3492 Category: Standards Track ISSN: 2070-1721

     Internationalized Domain Names in Applications (IDNA): Protocol


   This document is the revised protocol definition for    Internationalized Domain Names (IDNs).  The rationale for changes,    the relationship to the older specification, and important    terminology are provided in other documents.  This document specifies    the protocol mechanism, called Internationalized 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.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Klensin                      Standards Track                    [Page 1]
 RFC 5891                    IDNA2008 Protocol                August 2010

 Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    ( in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisions and are provided without warranty as    described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF    Contributions published or made publicly available before November    10, 2008.  The person(s) controlling the copyright in some of this    material may not have granted the IETF Trust the right to allow    modifications of such material outside the IETF Standards Process.    Without obtaining an adequate license from the person(s) controlling    the copyright in such materials, this document may not be modified    outside the IETF Stand...