Relevant Standards, IAB Statements, and Reports
IDNA2008:
Standards Track
RFC 5890 [TXT, 53 KB] Internationalized Domain Names for Applications (IDNA): Definitions and Document Framework
RFC 5891 [TXT, 38 KB] Internationalized Domain Names in Applications (IDNA): Protocol
RFC 5892 [TXT, 183 KB] The Unicode Code Points and Internationalized Domain Names for Applications (IDNA)
RFC 5893 [TXT, 38 KB] Right-to-Left Scripts for Internationalized Domain Names for Applications (IDNA)
Informational
RFC 5894 [TXT, 113 KB] Internationalized Domain Names for Applications (IDNA): Background, Explanation, and Rationale
RFC 5895 [TXT, 16 KB] Mapping Characters for Internationalized Domain Names in Applications (IDNA) 2008
IAB statements
IAB Statement on Identifiers and Unicode (2018-03-15)
IAB Statement on Identifiers and Unicode 7.0.0 (2015-02-11)
Additional Relevant RFCs:
RFC 9233 [TXT, 70KB] Internationalized Domain Names for Applications 2008 (IDNA2008) and Unicode 12.0.0
RFC 8753 [TXT, 60KB] Internationalized Domain Names for Applications (IDNA) Review for New Unicode Versions
RFC 8228 [TXT, 50KB] Guidance on Designing Label Generation Rulesets (LGRs) Supporting Variant Labels
RFC 7940 [TXT, 167KB] Representing Label Generation Rulesets Using XML
RFC 6927 [TXT, 40KB] Variants in Second-Level Names Registered in Top-Level Domains
RFC 6912 [TXT, 27KB] Principles for Unicode Code Point Inclusion in Labels in the DNS
RFC 5992 [TXT, 54KB] Internationalized Domain Names Registration and Administration Guidelines for European Languages Using Cyrillic
RFC 5646 [TXT, 204KB] Tags for Identifying Languages
RFC 5564 [TXT, 23KB] Linguistic Guidelines for the Use of the Arabic Language in Internet Domains
RFC 4690 [TXT, 100 KB] Review and Recommendations for Internationalized Domain Names (IDNs)
RFC 4290 Suggested Practices for Registration of Internationalized Domain Names (IDN)
RFC 4185 [TXT, 52 KB] National and Local Characters for DNS Top Level Domain (TLD) Names
RFC 3743 [TXT, 76 KB] Joint Engineering Team (JET) Guidelines for IDN Registration and Administration for Chinese, Japanese, and Korean
RFC3696 [TXT, 39KB] Application Techniques for Checking and Transformation of Names
RFC 1123 [TXT, 235KB] Requirements for Internet Hosts -- Application and Support
IDNA2003:
RFC 3454 [TXT, 136 KB] Preparation of Internationalized Strings ("stringprep")
RFC 3490 [TXT, 52 KB] Internationalizing Domain Names in Applications
RFC 3491 [TXT, 12 KB] Nameprep: A Stringprep Profile for Internationalized Domain Names
RFC 3492 [TXT, 68 KB] Punycode: A Bootstring encoding of Unicode for Internationalized Domain Names in Applications
Unicode Consortium:
Unicode Standard Annex #15 (UAX#15): Unicode Normalization Forms
Unicode Standard Annex #31 (UAX#31): Unicode Identifier and Pattern Syntax
Unicode Technical Report #36 (UTR#36): Unicode Security Considerations
Unicode Technical Report #39 (UTR#39): Unicode Security Mechanisms
ccNSO/GNSO Joint IDN Working Group (JIG):
JIG Final Report on Universal Acceptance of IDN TLDs (2013-11-15)
JIG Final Report on Single Character IDN TLDs (2011-03-30)
SSAC Documents
SAC052: SSAC Advisory on Single-Character Internationalized Domain Name Top-Level Domains
SAC060: SSAC Comment on Examining the User Experience Implications of Active Variant TLDs Report
SAC088: SSAC Response to the ccNSO evaluation of SAC084
SAC089: SSAC Response to ccNSO Comments on SAC084
SAC095: SSAC Advisory on the Use of Emoji in Domain Names
SAC099: SSAC Response to the ICANN Internationalized Domain Name Guidelines Working Group
SAC120: SSAC Input to GNSO IDN EPDP on Internationalized Domain Name Variants