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Request for Proposal for Reference LGRs for the Second Level

The Internet Corporation for Assigned Names and Numbers ("ICANN") is seeking provider(s) to develop Label Generation Rules (LGRs) for multiple languages (and scripts) for use at the second level, based on a new machine readable formal representation available at

In the new gTLD program, during Pre-Delegation Testing (PDT) ICANN has noted a large number of IDN table submissions. The IDN tables submitted by the new gTLD registries varied in the repertoire of characters included and the contextual rules. In order to improve consistency of testing and stability of registry operations of new gTLDs, ICANN has approved the development of reference LGRs for the second level for use in Pre-Delegation Testing (PDT) and the Registry Service Evaluation Process (RSEP). These tables will be developed based on authoritative sources, validated by experts and then finalized based on community feedback. Once finalized, these will be published openly by ICANN.

ICANN intends to use these reference LGRs for the second level for internal operations and will make them available for the community.

For additional information and instructions for submitting responses please click here [ZIP, 974 KB].

Proposals should be submitted to by 23:59 UTC on the deadline provided below.

RFP timeline at a glance:



RFP released to providers on

5 June, 2015

Participants provide an intent to bid email

12 June 2015 by 23:59 UTC

Participants submit any questions to ICANN

12 June 2015 by 23:59 UTC

ICANN responds to participant questions by

19 June 2015

Provider RFP proposals due by

30 June, 2015 by 23:59 UTC

Preliminary evaluation of responses

8 July 2015

Target for participant presentations (finalists)

Week of 13 July 2015

Target for Final evaluations and selection of provider (includes contracting and award to participant)

Weeks of 20 July & 27 July 2015

Estimated start of implementation

15 August, 2015

Batch 1 Delivery to ICANN

15 November, 2015

Public Comment Report on Batch 1 to ICANN

30 January, 2016

Batch 1 Final Delivery to ICANN

1 March, 2016

Batch 2 Delivery to ICANN

1 February, 2015

Public Comment Report on Batch 2 to ICANN

1 April, 2016

Batch 2 Final Delivery to ICANN

1 May, 2016

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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."