Domaining Guide

Pseudo top-level domain

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A number of pseudo top-level domains to be used in naming computers have been defined at various times. These "pseudo-TLDs" include .bitnet, .csnet, .local, .onion and .uucp. Although these pseudo-TLDs look like top-level domains, and serve the same syntactic function in creating names for network endpoints, they have no meaning in the global Domain Name System and are (or were) used only for specialist purposes; typically for addressing machines that were not reachable via the Internet Protocol for use in services such as E-mail and Usenet via UUCP.

Although they have no official status, they are generally regarded as having been unofficially "grandfathered", and are unlikely ever to be allocated as top-level domains.

.arpa is unique in having been a pseudo-top-level domain, formerly used by ARPA, that has now become a real top-level domain that is defined in the Internet DNS root for use as an infrastructure top-level domain.

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Top-level domain
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Generic top-level domain
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List of Internet top-level domains
Proposed top-level domain
Pseudo top-level domain
Second-level domain

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