Skip to main content

Join Us!

Registration is open for the ICANN67 Community Forum in Cancún, México. The Public Meeting will take place from 7-12 March 2020 at Cancún International Convention Center. Look forward to seeing you at the Community Forum in Cancún.

Register today

Quicklinks

Blog Posts

Enhancing ICANN’s Investment Policies

Chair's Blog: ICANN66 Meeting & Board Workshop

ICANN Takes DNS Discussions to the 14th Internet Governance Forum

BROWSE ALL BLOG POSTS

News and Announcements

Post-ICANN66 Policy Report Now Available

Thumb post icann66 policy report

The Post-ICANN66 Policy Report is now available. Get important updates from the Supporting Organizations and Advisory Committees by clicking on the headline above.

New ICANN Learn Course: Policy Writing for Public Comment

Thumb icann learn

Do you want to contribute to the Public Comment proceedings? ICANN Learn now hosts a course on Public Comments and policy work to help you get started. The course covers the importance of effective communication and explores practical strategies to improve writing. Click the headline above to sign up for ICANN Learn and enroll today.

ccTLDs Invited to Participate in DAAR

Thumb cctld dns abuse activity reporting daar 01 icannorg 492x279

The ICANN organization invites all ccTLD operators to participate in the Domain Abuse Activity Reporting (DAAR) project to promote a greater understanding of Domain Name System (DNS) abuse across the global DNS. Click the link above to know more.

ICANN68 Fellowship Application Round Now Open

Thumb icnn68 492x279

The Fellowship Program application round is now open for the ICANN68 Policy Forum. This round is only open to candidates who have previously completed an ICANN Fellowship. ICANN68 will take place from 22 to 25 June 2020 in Kuala Lumpur, Malaysia. The deadline to apply is 15 December 2019, 23:59 UTC.

View all

A note about our privacy policies and terms of service:

We have updated our privacy policies and certain website terms of service to provide greater transparency, promote simplification, and align with recent changes in privacy 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."