Top-level domain

For a full list of about 1,500 TLDs, see List of Internet top-level domains.
Example domainTypeSponsoring institution
arpaInfrastructureInternet Architecture Board; restricted[1]
blueGenericAfilias Limited; unrestricted[2][3]
ovhGenericOVH SAS; run by AFNIC, unrestricted[4]
nameRestricted genericVeriSign Information Services, Inc.; unrestricted[5]
acCountry-codeCable and Wireless (Ascension Island); unrestricted[6]
zwCountry-codePostal and Telecommunications Regulatory Authority of Zimbabwe; unrestricted[7]
aeroSponsoredSociété Internationale de Télécommunications Aéronautiques; unrestricted[8]
ไทยInternationalized country-codeTHNIC[9]

A top-level domain (TLD) is one of the domains at the highest level in the hierarchical Domain Name System of the Internet.[10] The top-level domain names are installed in the root zone of the name space. For all domains in lower levels, it is the last part of the domain name, that is, the last label of a fully qualified domain name. For example, in the domain name www.example.com, the top-level domain is com. Responsibility for management of most top-level domains is delegated to specific organizations by the Internet Corporation for Assigned Names and Numbers (ICANN), which operates the Internet Assigned Numbers Authority (IANA), and is in charge of maintaining the DNS root zone.

IANA currently distinguishes the following groups of top-level domains:[11]

History

Originally, the top-level domain space was organized into three main groups: Countries, Categories, and Multiorganizations.[12] An additional temporary group consisted of only the initial DNS domain, arpa,[13] and was intended for transitional purposes toward the stabilization of the domain name system.

Other Languages
Alemannisch: Top Level Domain
asturianu: Dominiu Internet
Bân-lâm-gú: Siōng-téng domain
беларуская (тарашкевіца)‎: Дамэн верхняга ўзроўню
eesti: Tippdomeen
Ελληνικά: Top-level domain
emiliàn e rumagnòl: Domìni ed prìm livêl
hrvatski: Vršna domena
interlingua: Dominio Internet
íslenska: Rótarlén
къарачай-малкъар: Интернет доменле
Lëtzebuergesch: Top-Level-Domän
македонски: Највисок домен
Nederlands: Topleveldomein
Nordfriisk: TLD
norsk nynorsk: Toppnivådomene
Nouormand: TLD
Plattdüütsch: Top Level Domain
português: Domínio de topo
română: TLD
Seeltersk: TLD
Simple English: Top-level domain
Sranantongo: Internet TLD
Basa Sunda: Domain undak luhur
svenska: Toppdomän
文言: 頂級域名
粵語: 頂級域名
中文: 頂級域