Skip to main content

Welcome to the new! Learn more, and send us your feedback. Dismiss

Open Now

ICANN54 Dublin hotel booking links are now open! ICANN54 will be held 18-22 October 2015 in Dublin, Ireland at The Convention Centre Dublin (CCD). ICANN group hotel rates and more information about travel and visa requirements will be available through the ICANN Meeting Website.

Visit Meetings Site

Blog Posts

Hero1 dublin 750x426 24jun15 en

Get Ready for ICANN 54 in Dublin!

Hero1 welcome icann53 2738x1825 en

Welcome to ICANN53!

Hero1 fadi chehade 750x425 20jun15

A Message from Buenos Aires


News and Announcements

Register now for ICANN's FY15 Q4 Stakeholder Call on 20 August

ICANN54 Dublin Logo

At the ICANN53 Opening Ceremony, you heard ICANN’s Fadi Chehadé speak about the Planning System & how ICANN regularly reports against its strategic & operating plans. Please join us for the next Quarterly Stakeholder Call, 20 August at 1400 UTC to learn about activities for the quarter ending 30 June. Click the headline above to Register.

Africa DNS Forum 2015

Photo of Nairobi

We are happy to announce the third edition of the Africa DNS Forum 2015, will take place July 6-8 2015, in Nairobi, Kenya. A great opportunity to learn more about the DNS Industry in Africa as well as an opportunity for experts, and industry players to identify what actions must be taken to foster the maturity of a digital ecosystem for Africa.

GNSO Review Wants Your Input!

ICANN GNSO wants your feedback

It’s your turn to comment on the independent review of the GNSO, the policy-making body for generic Top-Level Domains. Don’t have time to review the entire draft report? Read the short Report Summary and provide comment on any or all of the 36 recommendations. Your feedback could become part of the final report!

View all
Home groups
ICANN Groups

We depend on the support of many different types of groups and sub-structures: Advisory Commitees, Supporting Organizations, standingcommittees, working groups, review teams, task forces, and more.

Explore all Groups

Domain Name System
Internationalized Domain Name ,IDN,"IDNs are domain names that include characters used in the local representation of languages that are not written with the twenty-six letters of the basic Latin alphabet ""a-z"". An IDN can contain Latin letters with diacritical marks, as required by many European languages, or may consist of characters from non-Latin scripts such as Arabic or Chinese. Many languages also use other types of digits than the European ""0-9"". The basic Latin alphabet together with the European-Arabic digits are, for the purpose of domain names, termed ""ASCII characters"" (ASCII = American Standard Code for Information Interchange). These are also included in the broader range of ""Unicode characters"" that provides the basis for IDNs. The ""hostname rule"" requires that all domain names of the type under consideration here are stored in the DNS using only the ASCII characters listed above, with the one further addition of the hyphen ""-"". The Unicode form of an IDN therefore requires special encoding before it is entered into the DNS. The following terminology is used when distinguishing between these forms: A domain name consists of a series of ""labels"" (separated by ""dots""). The ASCII form of an IDN label is termed an ""A-label"". All operations defined in the DNS protocol use A-labels exclusively. The Unicode form, which a user expects to be displayed, is termed a ""U-label"". The difference may be illustrated with the Hindi word for ""test"" — परीका — appearing here as a U-label would (in the Devanagari script). A special form of ""ASCII compatible encoding"" (abbreviated ACE) is applied to this to produce the corresponding A-label: xn--11b5bs1di. A domain name that only includes ASCII letters, digits, and hyphens is termed an ""LDH label"". Although the definitions of A-labels and LDH-labels overlap, a name consisting exclusively of LDH labels, such as"""" is not an IDN."