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A top-level domain (TLD) is one of the domains at the highest level in the hierarchical Domain Name System of the Internet after the root domain. [1]
This list of Internet top-level domains (TLD) contains top-level domains, which are those domains in the DNS root zone of the Domain Name System of the Internet. A list of the top-level domains by the Internet Assigned Numbers Authority (IANA) is maintained at the Root Zone Database. [ 1 ]
Top-level domains form the DNS root zone of the hierarchical Domain Name System. Every domain name ends with a top-level domain label. During the growth of the Internet, it became desirable to create additional generic top-level domains. As of October 2009, 21 generic top-level domains and 250 two-letter country-code top-level domains existed. [11]
However, the creation of the .uk TLD predates the ISO 3166-1 list of ccTLDs and is the primary TLD for the United Kingdom. [69] Nominet UK: Yes: Yes: Yes 24 July 1985.us United States of America: United States: Registrants must be United States citizens, residents, or organizations, or a foreign entity with a presence in the United States.
Dot-separated fully qualified domain names are the primarily used form for human-readable representations of a domain name. Dot-separated domain names are not used in the internal representation of labels in a DNS message [7] but are used to reference domains in some TXT records and can appear in resolver configurations, system hosts files, and URLs.
The contents of the root zone file is a list of names and numeric IP addresses of the root domain authoritative DNS servers for all top-level domains (TLDs) such as com, org, edu, and the country code top-level domains (it also includes that info for root domain, the dot). On 12 December 2004, 773 different authoritative servers for the TLDs ...
Thus, domains edu, gov, int, and mil are now considered sponsored top-level domains, along with other themed top-level domains like jobs. The entire group of domains that do not have a geographic or country designation (see country-code top-level domain) is still often referred to by the term generic TLDs.
However, more recent articles have cautioned or advised against such use of the .local TLD. Support article 300684 [6] listed contoso.local as an example of a "best-practice Active Directory domain name", but then added: We recommend that you register DNS names for the top-most internal and external DNS namespaces with an Internet registrar.