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Invitation: Name Collision Analysis Project (NCAP) Discussion Group

LOS ANGELES – 17 April 2019 – The Internet Corporation for Assigned Names and Numbers (ICANN) is seeking participants for the Name Collision Analysis Project (NCAP) discussion group.

The NCAP discussion group, as defined by the Security and Stability Advisory Committee (SSAC) proposal and revised by ICANN's Office of the CTO, is an open and public group tasked with discussing issues pertaining to the work of the NCAP Study 1.

The NCAP Study 1 was authorized by the ICANN Board of Directors on 14 March 2019. The study will:

  • examine all prior work on the issue of name collisions and produce a summary report that brings forward important knowledge from prior work into this study, and which can act as a primer for those new to the subject.
  • create a list of data sets used in past studies, identify gaps, if any, and list additional data that would be required to successfully complete Studies 2 and 3.
  • decide if the project should proceed based on the results of the survey of prior work and the availability of data.

There are two ways to participate in the NCAP discussion group:

  • Individual participants – Participants are expected to actively contribute to mailing list conversations as well as meetings. Each potential participant will be required to provide a Statement of Interest (SOI) before gaining posting rights to the mailing list. It is anticipated that participants will provide essential input to the process.
  • Mailing list observers – The position of observer is for those only interested in monitoring the NCAP discussions. Observers are offered read-only access to the mailing list. At any point in time, a mailing list observer can join the NCAP discussion group as a participant simply by submitting a SOI.

To operate in a transparent manner, all mailing list exchanges are publicly archived. All participants are responsible for abiding by ICANN's Expected Standards for Behavior.

To join the Name Collision Analysis Project discussion group, please fill out the following questionnaire by 6 May 2019.


For more information on NCAP study 1, click here.


ICANN's mission is to help ensure a stable, secure, and unified global Internet. To reach another person on the Internet, you need to type an address – a name or a number – into your computer or other device. That address must be unique so computers know where to find each other. ICANN helps coordinate and support these unique identifiers across the world. ICANN was formed in 1998 as a not-for-profit public-benefit corporation with a community of participants from all over the world.

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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."