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Service Level Agreement (SLA) for the IANA Numbering Services

Status of SLA

01 October 2016:  The SLA is now in effect.


The now expired IANA functions contract defined requirements for reporting and performance of the IANA numbering services. In absence of the IANA functions contract, the Internet number community proposed the creation of an SLA between ICANN and the five RIRs under which ICANN would continue performing the IANA numbering services. Additionally, to provide oversight of the SLA, the Internet number community recommended the formation of a Review Committee to advise the Numbering Resource Organization (NRO) Executive Committee in its periodic review of ICANN’s performance against the SLA.

To fulfill the first requirement, the RIRs initiated the drafting of the SLA. Each draft was made available for public comment. ICANN provided input and feedback during the public comment process. The first draft of the agreement was published in May 2015 and the final signature draft was published in May 2016.

The final SLA contains performance expectations, and specifies escalation paths and dispute resolution mechanisms in the event of non-performance. The term of the SLA automatically renews every five years, unless either ICANN or the RIRs elect to not renew for any reason (with or without cause) by providing six-months’ notice prior to the expiration of the then-current term. In the event of non-renewal or termination, the RIRs will select a successor operator to deliver the numbering services.

On May 27, 2016, the ICANN Board approved the SLA for signing. On June 29, 2016, ICANN and the RIRs signed the SLA. The SLA is now in effect.

To fulfill the second requirement, the RIRs initiated a community process and formed the Review Committee.


Relevant Links

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."