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Six Scripts Integrated into the Second Version of Root Zone Label Generation Rules (RZ-LGR-2)

The Internet Corporation for Assigned Names and Numbers (ICANN) today opened public comment on the second version of Root Zone Label Generation Rules (RZ-LGR-2) integrating six scripts: Arabic, Ethiopic, Georgian, Khmer, Lao and Thai.

The Root Zone LGR will be used to determine valid top-level Internationalized Domain Name (IDN) labels and their variant labels, if any. Work is underway by the community-based Generation Panels on proposals for additional scripts to be integrated in the future versions of the Root Zone LGR. These include Chinese, Cyrillic, Greek, Japanese, Korean, Latin and Neo-Brahmi panels.

Generation Panels for more scripts, including Hebrew, Myanmar, Sinhala, Tibetan and Thaana are actively being solicited as per the Call for Generation Panels. Individuals with deep experience or interest in these scripts are encouraged to volunteer and help enable a multilingual Internet.

For further information on the IDN Program at ICANN, please visit To start a new Generation Panel or to get involved in an existing one, please email at

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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."