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Old 6th September 2009, 12:59 PM
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Internationalized Domain Names in Applications (IDNA): Protocol

http://tools.ietf.org/html/draft-iet...is-protocol-15

Abstract

This document is the revised protocol definition for
internationalized domain names (IDNs). The rationale for changes,
the relationship to the older specification, and important
terminology are provided in other documents. This document specifies
the protocol mechanism, called Internationalized Domain Names in
Applications (IDNA), for registering and looking up IDNs in a way
that does not require changes to the DNS itself. IDNA is only meant
for processing domain names, not free text.

Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1. Discussion Forum . . . . . . . . . . . . . . . . . . . . . 5
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Requirements and Applicability . . . . . . . . . . . . . . . . 6
3.1. Requirements . . . . . . . . . . . . . . . . . . . . . . . 6
3.2. Applicability . . . . . . . . . . . . . . . . . . . . . . 6
3.2.1. DNS Resource Records . . . . . . . . . . . . . . . . . 7
3.2.2. Non-domain-name Data Types Stored in the DNS . . . . . 7
4. Registration Protocol . . . . . . . . . . . . . . . . . . . . 7
4.1. Input to IDNA Registration Process . . . . . . . . . . . . 8
4.2. Permitted Character and Label Validation . . . . . . . . . 8
4.2.1. Input Format . . . . . . . . . . . . . . . . . . . . . 8
4.2.2. Rejection of Characters that are not Permitted . . . . 8
4.2.3. Label Validation . . . . . . . . . . . . . . . . . . . 8
4.2.4. Registration Validation Summary . . . . . . . . . . . 9
4.3. Registry Restrictions . . . . . . . . . . . . . . . . . . 9
4.4. Punycode Conversion . . . . . . . . . . . . . . . . . . . 10
4.5. Insertion in the Zone . . . . . . . . . . . . . . . . . . 10
5. Domain Name Lookup Protocol . . . . . . . . . . . . . . . . . 10
5.1. Label String Input . . . . . . . . . . . . . . . . . . . . 11
5.2. Conversion to Unicode . . . . . . . . . . . . . . . . . . 11
5.3. A-label Input . . . . . . . . . . . . . . . . . . . . . . 11
5.4. Validation and Character List Testing . . . . . . . . . . 12
5.5. Punycode Conversion . . . . . . . . . . . . . . . . . . . 13
5.6. DNS Name Resolution . . . . . . . . . . . . . . . . . . . 13
6. Security Considerations . . . . . . . . . . . . . . . . . . . 13
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 14
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 14
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
10.1. Normative References . . . . . . . . . . . . . . . . . . . 15
10.2. Informative References . . . . . . . . . . . . . . . . . . 16
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