The Internet Engineering Task Force (IETF) has been leading the effort to publish the standards related to IDN. There are four RFCs (Request for Comment) concerning the standardized implementation of IDNs:
Internationalized Domain Name RFCs
String Preparation (stringprep)
RFC 3454
(published December 2002)
IDNs in Applications (IDNA)
RFC 3490
(published March 2003)
Name Preparation (nameprep)
RFC 3491
Encoding Scheme (Punycode)
RFC 3492
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