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Internationalized Domain Names Registration and Administration Guidelines for European Languages Using Cyrillic (RFC5992) Disclosure Number: IPCOM000200300D
Original Publication Date: 2010-Oct-01
Included in the Prior Art Database: 2010-Oct-05
Document File: 42 page(s) / 54K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

S. Sharikov: AUTHOR [+2]


Cyrillic is one of a fairly small number of scripts that are used, with different subsets of characters, to write a large number of languages, some of which are not closely related to the others. When those languages might be used together in a zone (typical of generic TLDs (gTLDs) but likely in other zones both at and below the root), special considerations for intermixing characters may apply. Cyrillic also has the property that, while it is usually considered a separate script from the Latin (Roman) and Greek ones, it shares many characters with them, creating opportunities for visual confusion. Those difficulties are especially pronounced when "all of Cyrillic" is used rather than only the characters associated with a particular language.

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Independent Submission                                       S. Sharikov Request for Comments: 5992                                   Regtime Ltd Category: Informational                                    D. Miloshevic ISSN: 2070-1721                                                  Afilias                                                               J. Klensin                                                             October 2010

      Internationalized Domain Names Registration and Administration             Guidelines for European Languages Using Cyrillic


   This document is a guideline for registries and registrars on    registering internationalized domain names (IDNs) based on (in    alphabetical order) Bosnian, Bulgarian, Byelorussian, Kildin Sami,    Macedonian, Montenegrin, Russian, Serbian, and Ukrainian languages in    a DNS zone.  It describes appropriate characters for registration and    variant considerations for characters from Greek and Latin scripts    with similar appearances and/or derivations.

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

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.

Sharikov, et al.              Informational                     [Page 1]
 RFC 5992                      Cyrillic IDNs                 October 2010

 Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2

     1.1.  Similar Characters and Variants  . . . . . . . . . . . . .  3

     1.2.  Terminology  . . . . . . . . ....