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Internationalized Domain Names

Background Material

Guidelines for Implementation of IDNs

IANA Registry for IDN Character Tables

ICANN Board Resolutions

ICANN Committees and Working Groups


ICANN Workshops and Presentations

IDN-Discuss Mailing List Archives

Unicode Code Charts (Unicode Standard character contents reference)

Welcome to the Internationalized Domain Names (IDN) information area.

Internationalized Domain Names (IDNs) are domain names represented by local language characters. Such domain names could contain letters or characters from non-ASCII scripts (for example, Arabic or Chinese). Many efforts are ongoing in the Internet community to make domain names available in character sets other than ASCII.

These "internationalized domain name" (IDN) efforts were the subject of a 25 September 2000 resolution by the ICANN Board of Directors, which recognized "that it is important that the Internet evolve to be more accessible to those who do not use the ASCII character set," and also stressed that "the internationalization of the Internet's domain name system must be accomplished through standards that are open, non-proprietary, and fully compatible with the Internet's existing end-to-end model and that preserve globally unique naming in a universally resolvable public name space."

This area is designed to document the progress of the implementation of IDNs as well as allow for discussion of issues encountered in implementation. As part of this effort, ICANN hosts a publicly archived mailing list for discussion of IDN implementation issues. All gTLD and ccTLD registries and other interested parties are encouraged to participate in the IDN-discuss list.

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

IDN Homograph Concerns

ICANN Statement on IDN Homograph Attacks and Request for Public Comment

gTLD Communique: Potential of IDN for malicious abuse

APTLD: Statement on phishing

CENTR: Statement on homograph attacks

Deployment of IDNs (ICANN Announcement 20 June 2003)

Mailing List Archives

IDN Discussion Registration and Instructions

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