Variants in Second-Level Names Registered in Top-Level Domains
RFC 6927

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Independent Submission                                         J. Levine
Request for Comments: 6927                          Taughannock Networks
Category: Informational                                       P. Hoffman
ISSN: 2070-1721                                           VPN Consortium
                                                                May 2013

     Variants in Second-Level Names Registered in Top-Level Domains

Abstract

   Internationalized Domain Names for Applications (IDNA) provides a
   method to map a subset of names written in Unicode into the DNS.
   Because of Unicode decisions, appearance, language and writing system
   conventions, and historical reasons, it often has been asserted that
   there is more than one way to write what competent readers and
   writers think of as the same host name; these different ways of
   writing are often called "variants".  (The authors note that there
   are many conflicting definitions for the term "variant" in the IDNA
   community.)  This document surveys the approaches that top-level
   domains have taken to the registration and provisioning of domain
   names that have variants.  This document is not a product of the
   IETF, does not propose any method to make variants work "correctly",
   and is not an introduction to internationalization or IDNA.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This is a contribution to the RFC Series, independently of any other
   RFC stream.  The RFC Editor has chosen to publish this document at
   its discretion and makes no statement about its value for
   implementation or deployment.  Documents approved for publication by
   the RFC Editor are not a candidate for any level of Internet
   Standard; see 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/rfc6927.

Levine & Hoffman              Informational                     [Page 1]
RFC 6927          Variants in Second-Level Domain Names         May 2013

Copyright Notice

   Copyright (c) 2013 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.

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................4
   3. Base Documents ..................................................5
   4. Domain Practices of gTLDs .......................................6
      4.1. AERO .......................................................6
      4.2. ASIA .......................................................6
      4.3. BIZ ........................................................6
      4.4. CAT ........................................................6
      4.5. COM ........................................................7
      4.6. COOP .......................................................7
      4.7. INFO .......................................................7
      4.8. JOBS .......................................................7
      4.9. MOBI .......................................................7
      4.10. MUSEUM ....................................................8
      4.11. NAME ......................................................8
      4.12. NET .......................................................8
      4.13. ORG .......................................................8
      4.14. POST ......................................................9
      4.15. PRO .......................................................9
      4.16. TEL .......................................................9
      4.17. TRAVEL ...................................................10
      4.18. XXX ......................................................10
   5. Domain Practices of ccTLDs .....................................10
      5.1. BG ........................................................10
      5.2. BR ........................................................10
      5.3. CL ........................................................10
      5.4. CN ........................................................10
      5.5. ES ........................................................11
      5.6. EU ........................................................11
      5.7. GR ........................................................11
      5.8. IL ........................................................11
      5.9. IR ........................................................11