Skip to main content

Announcements

Public Comment Period for Singapore Board Meeting Agenda

In accordance with the ICANN Bylaws, background materials, reports and recommendations to the...

Information Concerning the Formation of ICANN Supporting Organizations

1. Purpose

The purpose of this note is to provide assistance to those members of the Internet...

Press Release: ICANN Membership Advisory Committee Appointed

LOS ANGELES, December 17, 1998 -- The Internet Corporation for Assigned Names and Numbers is...

Contents of ICANN Press Release 25 November 1998

ICANN Executes Agreement with U.S. Government

LOS ANGELES, November 25, 1998 -- The Internet Corporation for Assigned Names and Numbers...

ICANN Holds First European Open Public Meeting

BRUSSELS, 25 November 1998 - Responding to the increasingly global nature of the Internet, the...

ICANN Membership Advisory Committee—Expressions of Interest Sought by 5 December, 1998

The ICANN Bylaws call for a membership structure to be established to elect At Large directors....

Contents of ICANN Press Release 23 November 1998

Press Release: ICANN Announces Changes, Requests DNS Transition Begin

LOS ANGELES, November 23, 1998 -- The Internet Corporation for Assigned Names and Numbers...

Press Release: ICANN Holds First of Many Open Public Meetings

CAMBRIDGE, MA, Nov. 16, 1998 -- Over 200 members of the international Internet community...

Contents of ICANN Press Release 06 November 1998

Press Release: ICANN Asks Commerce Department to Begin DNS Transition

LOS ANGELES, November 6, 1998 -- The Internet Corporation for Assigned Names and Numbers (ICANN)...

 |  Announcement, DNS Marketplace

ICANN Public Meeting Details

***See updated meeting information, including comments submitted***

Meeting to be held in...

ICANN Board Announces Public Meeting

The Board of Directors of the Internet Corporation for Assigned Names and Numbers (ICANN) is...

ICANN Elects Board and Appoints Interim President

Internet Address Arbiter Proposed Transfer of Function to Private Sector

Contact: Bob Calverley (213-740-4750)

1098001

email: calverle@usc.edu

The Internet Assigned...

A note about our terms of service:

We have updated our electronic terms of service to provide greater transparency and align with laws applicable to us. Learn more.

This site uses cookies to deliver an efficient user experience and to help us see how the site is used. Learn more.OK

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""icann.org"" is not an IDN."