Internationalized Domain Names for Applications (IDNA): Definitions and Document Framework
RFC 5890
Document | Type |
RFC - Proposed Standard
(August 2010; Errata)
Obsoletes RFC 3490
|
|
---|---|---|---|
Last updated | 2016-05-18 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized with errata bibtex | ||
Reviews | |||
Stream | WG state | WG Document | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5890 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Lisa Dusseault | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) J. Klensin Request for Comments: 5890 August 2010 Obsoletes: 3490 Category: Standards Track ISSN: 2070-1721 Internationalized Domain Names for Applications (IDNA): Definitions and Document Framework Abstract This document is one of a collection that, together, describe the protocol and usage context for a revision of Internationalized Domain Names for Applications (IDNA), superseding the earlier version. It describes the document collection and provides definitions and other material that are common to the set. 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/rfc5890. Klensin Standards Track [Page 1] RFC 5890 IDNA Definitions 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 5890 IDNA Definitions August 2010 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1. IDNA2008 . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.1. Audiences . . . . . . . . . . . . . . . . . . . . . . 4 1.1.2. Normative Language . . . . . . . . . . . . . . . . . . 5 1.2. Road Map of IDNA2008 Documents . . . . . . . . . . . . . . 5 2. Definitions and Terminology . . . . . . . . . . . . . . . . . 6 2.1. Characters and Character Sets . . . . . . . . . . . . . . 6 2.2. DNS-Related Terminology . . . . . . . . . . . . . . . . . 6 2.3. Terminology Specific to IDNA . . . . . . . . . . . . . . . 7 2.3.1. LDH Label . . . . . . . . . . . . . . . . . . . . . . 7 2.3.2. Terms for IDN Label Codings . . . . . . . . . . . . . 11 2.3.2.1. IDNA-valid strings, A-label, and U-label . . . . . 11 2.3.2.2. NR-LDH Label . . . . . . . . . . . . . . . . . . . 13 2.3.2.3. Internationalized Domain Name and Internationalized Label . . . . . . . . . . . . . 13 2.3.2.4. Label Equivalence . . . . . . . . . . . . . . . . 14 2.3.2.5. ACE Prefix . . . . . . . . . . . . . . . . . . . . 14 2.3.2.6. Domain Name Slot . . . . . . . . . . . . . . . . . 14 2.3.3. Order of Characters in Labels . . . . . . . . . . . . 15 2.3.4. Punycode is an Algorithm, Not a Name or Adjective . . 15 3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 16 4. Security Considerations . . . . . . . . . . . . . . . . . . . 16 4.1. General Issues . . . . . . . . . . . . . . . . . . . . . . 16 4.2. U-label Lengths . . . . . . . . . . . . . . . . . . . . . 16 4.3. Local Character Set Issues . . . . . . . . . . . . . . . . 17 4.4. Visually Similar Characters . . . . . . . . . . . . . . . 17 4.5. IDNA Lookup, Registration, and the Base DNS Specifications . . . . . . . . . . . . . . . . . . . . . . 18Show full document text