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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:
An overview with proposed issues and changes for IDNA
A suggestion for solving an IDNA problem in right-to-left scripts by revising the stringprep profile
An overview of suggested inclusion based IDNA Unicode code points based on Unicode 5.0