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Alternate Path to Delegation Report for .xyz

Eligibility for Alternate Path to Delegation

TLD "xyz" is eligible for the Alternate Path to Delegation as described in the ICANN New gTLD Collision Occurrence Management plan. [1]

Second Level Domains (SLDs)

A total of 20817 unique applicable SLDs were detected in the eight DNS-OARC "Day In The Life" ("DITL") datasets [2] collected in 2006-2013, and the 2010 DNSSEC rollout datasets; hereafter "input datasets." Pursuant to the ICANN New gTLD Collision Occurrence Management plan, if the Registry Operator chooses to block [3] all of these strings, its proposed TLD may proceed to delegation in advance of the forthcoming Collision Occurrence Assessment.

The list of SLD Strings that must be blocked is available here.

Strings appearing in the input datasets that are not valid hostnames as defined in RFC 1123 ("LDH Rule") and are not valid A-labels as defined in RFC 5890 were not included in the block list. Furthermore, the contractually required SLD "nic" will not appear in the block list.

The block list was determined as follows:
  1. List all unique strings at the SLD position in DNS requests where the applied-for string is in the TLD position in all input datasets;
  2. Filter the SLD query position as described above;
  3. Remove the "Chrome 10" strings at the leftmost query position on a best effort basis (see Methodology section below);

The remaining SLD strings comprise the block list.


Data and Source Code

DNS-OARC data was re-processed from the raw PCAP [4] files provided by participating DNS Root Server Operators as a part of the "Day In The Life," and 201

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."