Internationalized Domain Names in Applications (IDNA): Registry Restrictions and Recommendations
draft-klensin-idna-rfc5891bis-05
| Document | Type | Active Internet-Draft (individual in art area) | |
|---|---|---|---|
| Last updated | 2019-09-19 (latest revision 2019-08-29) | ||
| Stream | IETF | ||
| Intended RFC status | Proposed Standard | ||
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| Stream | WG state | (None) | |
| Document shepherd | Pete Resnick | ||
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| Consensus Boilerplate | Yes | ||
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| Responsible AD | Barry Leiba | ||
| Send notices to | (None) | ||
| IANA | IANA review state | IANA OK - No Actions Needed | |
Network Working Group J. Klensin
Internet-Draft
Updates: 5890, 5891, 5894 (if approved) A. Freytag
Intended status: Standards Track ASMUS, Inc.
Expires: March 1, 2020 August 29, 2019
Internationalized Domain Names in Applications (IDNA): Registry
Restrictions and Recommendations
draft-klensin-idna-rfc5891bis-05
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 discussion of circumstances
would have been helpful. Without making any substantive changes to
IDNA, this specification updates two of the core IDNA documents (RFCs
5890 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 1, 2020.
Klensin & Freytag Expires March 1, 2020 [Page 1]
Internet-Draft IDNA: Registry Restrictions August 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Registry Restrictions in IDNA2008 . . . . . . . . . . . . . . 4
3. Progressive Subsets of Allowed Characters . . . . . . . . . . 5
4. Considerations for For-Profit Domains . . . . . . . . . . . . 7
5. Other corrections and updates . . . . . . . . . . . . . . . . 9
5.1. Updates to RFC 5890 . . . . . . . . . . . . . . . . . . . 9
5.2. Updates to RFC 5891 . . . . . . . . . . . . . . . . . . . 10
6. Related Discussions . . . . . . . . . . . . . . . . . . . . . 10
7. Security Considerations . . . . . . . . . . . . . . . . . . . 11
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 11
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
10.1. Normative References . . . . . . . . . . . . . . . . . . 11
10.2. Informative References . . . . . . . . . . . . . . . . . 12
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 15
A.1. Changes from version -00 (2017-03-11) to -01 . . . . . . 15
A.2. Changes from version -01 (2017-09-12) to -02 . . . . . . 15
A.3. Changes from version -02 (2019-07-06) to -03 . . . . . . 15
A.4. Changes from version -03 (2019-07-22) to -04 . . . . . . 15
A.5. Changes from version -04 (2019-08-02) to -05 . . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
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
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