Skip to main content


ICANN Audited Financial Statements for FY16 Have Been Published

In support of its continued commitment to accountability and transparency, ICANN today published FY16 financial results accompanied by an unqualified audit report from its independent auditors, BDO LLP. The Report of Independent Auditors and...

Plan for Thin to Thick Whois Transition Available for Public Comment

LOS ANGELES – 26 October 2016 – The Internet Corporation for Assigned Names and Numbers (ICANN) today published [PDF, 66 KB] a proposed plan for implementing policy recommendations regarding Thick Whois. The plan requires gTLDs currently providing...

ICANN and CCK Collaborate on a Youth Education Initiative in Tunisia

The Internet Corporation for Assigned Names and Numbers (ICANN) and Centre de Calcul El-Khawarizmi (CCK) are pleased to announce their collaboration on a Youth Education Initiative to enhance youth capacity and awareness of Internet governance in...

ICANN Grants Data Retention Waiver to World4You Internet Services GmbH

DATA RETENTION WAIVER WORLD4YOU INTERNET SERVICE GMBH, AUSTRIA World4You Internet Service GmbH ("Registrar") submitted to ICANN a Registrar Data Retention Waiver Request ("Waiver Request") on the basis of Registrar's contention that compliance...




A comunidade da América Latina e do Caribe falou sobre o ICANN56

Mais informação sobre o GAC: Leia o comunicado do GAC emitido durante a reunião ICANN56: Assista ao vídeo de...


ICANN56: The LAC community shared some of the meeting's milestones

Learn more about the GAC: Read the GAC ICANN56 Helsinki Communiqué: Watch the video (in English) about GAC...

Artworks 000170551578 clh6a6 t500x500

Cheryl Langdon-Orr on the history of the ALAC

Cheryl Langdon-Orr, Former Chair of the At-Large Advisory Committee (ALAC), joins Ariel Liang, ICANN Policy Analyst, to talk about the history and founding of the ALAC.

Artworks 000170521765 u99wtl t500x500

Jelena Ožegović and Ayden Férdeline talk about ICANN’s NextGen Program

Two former NextGen@ICANN participants, Jelena Ožegović and Ayden Férdeline, join ICANN Global Media Coordinator, James Cole, to talk about what they learned from the program.


Blog Posts

The Next Version of ICANN’s KPI Dashboard is Now Live

Hero1 uasg tech 26oct16 en

Universal Acceptance Steering Group: A Year of Progress


Sign Up to Get News Updates

Tell us which topics you care about and we'll send updates to your homepage and email.

Already have an Account? Sign In

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."