Internationalized Domain Names in Applications (IDNA): Protocol
RFC 5891
Document | Type |
RFC - Proposed Standard
(August 2010; Errata)
Updates RFC 3492
|
|
---|---|---|---|
Author | John Klensin | ||
Last updated | 2015-10-14 | ||
Replaces | draft-klensin-idnabis-protocol | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Reviews | |||
Stream | WG state | WG Document | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5891 (Proposed Standard) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Lisa Dusseault | ||
Send notices to | (None) |
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 Abstract 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 http://www.rfc-editor.org/info/rfc5891. 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 (http://trustee.ietf.org/license-info) 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 Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English. Klensin Standards Track [Page 2] RFC 5891 IDNA2008 Protocol August 2010 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. Requirements and Applicability . . . . . . . . . . . . . . . . 5 3.1. Requirements . . . . . . . . . . . . . . . . . . . . . . . 5 3.2. Applicability . . . . . . . . . . . . . . . . . . . . . . 5 3.2.1. DNS Resource Records . . . . . . . . . . . . . . . . . 6 3.2.2. Non-Domain-Name Data Types Stored in the DNS . . . . . 6 4. Registration Protocol . . . . . . . . . . . . . . . . . . . . 6 4.1. Input to IDNA Registration . . . . . . . . . . . . . . . . 7 4.2. Permitted Character and Label Validation . . . . . . . . . 7 4.2.1. Input Format . . . . . . . . . . . . . . . . . . . . . 7 4.2.2. Rejection of Characters That Are Not Permitted . . . . 8 4.2.3. Label Validation . . . . . . . . . . . . . . . . . . . 8 4.2.4. Registration Validation Requirements . . . . . . . . . 9 4.3. Registry Restrictions . . . . . . . . . . . . . . . . . . 9 4.4. Punycode Conversion . . . . . . . . . . . . . . . . . . . 9 4.5. Insertion in the Zone . . . . . . . . . . . . . . . . . . 10 5. Domain Name Lookup Protocol . . . . . . . . . . . . . . . . . 10 5.1. Label String Input . . . . . . . . . . . . . . . . . . . . 10 5.2. Conversion to Unicode . . . . . . . . . . . . . . . . . . 10 5.3. A-label Input . . . . . . . . . . . . . . . . . . . . . . 10 5.4. Validation and Character List Testing . . . . . . . . . . 11 5.5. Punycode Conversion . . . . . . . . . . . . . . . . . . . 13 5.6. DNS Name Resolution . . . . . . . . . . . . . . . . . . . 13 6. Security Considerations . . . . . . . . . . . . . . . . . . . 13Show full document text