Internet Corporation for Assigned Names and Numbers
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RFCs Related to IDN
RFC 3454 Preparation of Internationalized Strings ("string-prep")
RFC 3490 Internationalizing Domain Names in Applications
RFC 3491 Nameprep: A Stringprep Profile for Internationalized Domain Names
RFC 3492 Punycode: A Bootstring encoding of Unicode for Internationalized Domain Names in Applications
RFC 3743 Joint Engineering Team (JET) Guidelines for IDN Registration and Administration for Chinese, Japanese, and Korean
RFC 4185 National and Local Characters for DNS Top Level Domain (TLD) Names
RFC 4690 Review and Recommendations for Internationalized Domain Names (IDNs)
Internet-Drafts with Proposed Issues and Changes for the IDNA Protocol:
The IDNA protocol standard is currently under review and revision. An informal expert panel, working as what the IETF calls a "design team," evaluated experiences gained in the implementation of IDNA since its introduction in 2003, and identified several key areas of future work. These were described in particular in RFC4690 that triggered a formal revision of the IDNA protocol. The core components in the revision effort include: definition of valid IDN labels, an inclusion-based model that recognizes the level of understanding of the implications of the Unicode handling of various scripts on use in IDNs (the current model is exclusion-based), elimination of confusing and non-reversible character mappings, fixing a right-to-left error in Stringprep, and eliminating Unicode version dependencies, thereby permitting more scripts to be used in IDNs now and in the future. The issues with the current IDN model that led to the revision work are discussed in RFC4690.
Latest version of the IDNA revision proposals are available through the IETF or at Patrik Fältström’s site: http://stupid.domain.name/idnabis/