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Final "Mitigating the Risk of DNS Namespace Collisions Phase One" Report Published

ICANN today announced the publication of the final "Mitigating the Risk of DNS Namespace Collisions Phase One" report by JAS Global Advisors ("JAS").

Download the Mitigating the Risk of DNS Namespace Collisions Phase One report [PDF, 392 KB]

The JAS study, which was commissioned by ICANN, provides a set of recommendations that describe a comprehensive approach to reducing current and future DNS namespace collisions, alerting operators of potential DNS namespace related issues, and providing emergency response capabilities in the event that critical (e.g., life safety) systems are adversely impacted. The final Phase One report takes into consideration feedback received during the public comment period that closed on 21 April 2014.

The JAS report, along with additional community feedback and other pertinent data, will be considered prior to providing the ICANN Board New gTLD Program Committee with a proposal to address name collisions for new gTLDs as part of the New gTLD Collision Occurrence Management Plan adopted on 7 October 2013, please visit A session to discuss this proposal and collect feedback from the community will be held at the ICANN meeting in London on 23 June 2015 at 17:00-18:30 local time. Schedules are subject to change, so please visit for the most updated information. Additional information on name collisions, including resources for IT professionals, can be found 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."