Internationalized Domain Names in Applications (IDNA): Registry Restrictions and Recommendations
draft-klensin-idna-rfc5891bis-01

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Last updated 2017-10-23 (latest revision 2017-09-12)
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Network Working Group                                         J. Klensin
Internet-Draft
Updates: 5890, 5891, 5894 (if approved)                       A. Freytag
Intended status: Standards Track                             ASMUS, Inc.
Expires: March 16, 2018                               September 12, 2017

    Internationalized Domain Names in Applications (IDNA): Registry
                    Restrictions and Recommendations
                    draft-klensin-idna-rfc5891bis-01

Abstract

   The IDNA specifications for internationalized domain names combine
   rules that determine the labels that are allowed in the DNS without
   violating the protocol itself and an assignment of responsibility,
   consistent with earlier specifications, for determining the labels
   that are allowed in particular zones.  Conformance to IDNA by
   registries and other implementations requires both parts.  Experience
   strongly suggests that the language describing those responsibilities
   was insufficiently clear to promote safe and interoperable use of the
   specifications and that more details and some specific examples would
   have been helpful.  Without making any substantive changes to IDNA,
   this specification updates two of the core IDNA documents (RFC 5980
   and 5891) and the IDNA explanatory document (RFC 5894) to provide
   that guidance and to correct some technical errors in the
   descriptions.

Status of This Memo

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   This Internet-Draft will expire on March 16, 2018.

Klensin & Freytag        Expires March 16, 2018                 [Page 1]
Internet-Draft         IDNA: Registry Restrictions        September 2017

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Registry Restrictions in IDNA2008 . . . . . . . . . . . . . .   3
   3.  Progressive Subsets of Allowed Characters . . . . . . . . . .   4
   4.  Other corrections and updates . . . . . . . . . . . . . . . .   6
     4.1.  Updates to RFC 5890 . . . . . . . . . . . . . . . . . . .   7
     4.2.  Updates to RFC 5891 . . . . . . . . . . . . . . . . . . .   8
   5.  Related Discussions . . . . . . . . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Appendix A.  Change Log . . . . . . . . . . . . . . . . . . . . .  12
     A.1.  Changes from version -00 (2017-03-11) to -01  . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   Parts of the specifications for Internationalized Domain Names in
   Applications (IDNA) [RFC5890] [RFC5891] [RFC5894] (collectively
   known, along with RFC 5892 [RFC5892], RFC 5893 [RFC5893] and updates
   to them, as "IDNA2008" (or just "IDNA") impose a requirement that
   domain name system (DNS) registries restrict the characters they
   allow in domain name labels (see Section 2 below), and the contents
   and structure of those labels.  That requirement and restriction are
   consistent with the "trustee for the community" requirements of the
   original specification for DNS naming and authority [RFC1591].  The
   restrictions are intended to limit the permitted characters and
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