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Mitigating the Risk of DNS Namespace Collisions Final Report by JAS Global Advisors

30 November 2015

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ICANN today announced the publication of "Mitigating the Risk of DNS Namespace Collisions Final Report," a report by JAS Global Advisors ("JAS"). This is the complete version of the report previously published in June 2014 at https://www.icann.org/en/system/files/files/name-collision-mitigation-study-06jun14-en.pdf [PDF, 392 KB].

The phase one report was used by ICANN as a base to develop the Name Collision Occurrence Management Framework that has been in use by new gTLDs for more than a year. The final JAS report is being published to provide full background to what later became the Framework. The final JAS report does not contain any new or amended recommendations, and registry operators will continue to be required to implement the name collision mitigation measures identified in the existing Framework.

At the time of publication of the phase one report, JAS uncovered a vulnerability not directly related to ICANN's New gTLD Program nor to new TLDs in general that had the potential to impact end-systems. Following its Coordinated Vulnerability Disclosure Reporting process [PDF, 628 KB], ICANN agreed to the requests from JAS and the affected vendor to postpone publishing the full report until the risks raised by the vulnerability had been mitigated.

 The affected vendor has since addressed the risks raised by the vulnerability, and , ICANN is now publishing the full report at https://www.icann.org/en/system/files/files/name-collision-mitigation-final-28oct15-en.pdf [PDF, 10.9 MB] and a redline from the phase one report at https://www.icann.org/en/system/files/files/name-collision-mitigation-final-redline-28oct15-en.pdf [PDF, 970 KB] (without considering the appendices).


ICANN's mission is to ensure a stable, secure and unified global Internet. To reach another person on the Internet you have to type an address into your computer - a name or a number. That address has to be unique so computers know where to find each other. ICANN coordinates these unique identifiers across the world. Without that coordination we wouldn't have one global Internet. ICANN was formed in 1998. It is a not-for-profit public-benefit corporation with participants from all over the world dedicated to keeping the Internet secure, stable and interoperable. It promotes competition and develops policy on the Internet's unique identifiers. ICANN doesn't control content on the Internet. It cannot stop spam and it doesn't deal with access to the Internet. But through its coordination role of the Internet's naming system, it does have an important impact on the expansion and evolution of the Internet. For more information please visit: www.icann.org.