Domain Name Extension Definitions

This page contains a list of more than 300 domain name extensions and their definitions.

Domain name extensions always consist of the top-level domain, and sometimes a second-level domain.

The top-level domains in this list are recognized by 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.

Generic Top-Level Domains (gTLD)

The following table represents the generic top-level domains (i.e. including .com, .org, etc).

Domain Purpose / Sponsoring Organization
.COM Generic top-level domain
VeriSign Global Registry Services
.INFO Generic top-level domain
Afilias Limited
.NET Generic top-level domain
VeriSign Global Registry Services
.ORG Generic top-level domain
Public Interest Registry (PIR)

Generic-Restricted Top-Level Domains

Generic-restricted top-level domain names are similar to the generic top-level domains, only eligibility is intended to be restricted and ascertained more stringently.

Domain Purpose / Sponsoring Organization
.BIZ Restricted for Business
NeuStar, Inc.
.NAME Reserved for individuals
The Global Name Registry Ltd.
.PRO Restricted to credentialed professionals and related entities
Registry Services Corporation
dba RegistryPro

Sponsored Top-Level Domains (sTLD)

These domains are proposed and sponsored by private agencies or organizations that establish and enforce rules restricting the eligibility to use the TLD. IANA also groups sTLDs with the generic top-level domains.

Domain Purpose / Sponsoring Organization
.AERO Reserved for members of the air-transport industry
Societe Internationale de Telecommunications Aeronautique S.C.
.ASIA Restricted to the Pan-Asia and Asia Pacific community
DotAsia Organization Ltd.
.CAT Reserved for the Catalan linguistic and cultural community
Fundacio puntCAT
.COOP Reserved for cooperative associations
DotCooperation LLC
.EDU Reserved for post-secondary institutions accredited by an agency on the U.S. Department of Education's list of Nationally Recognized Accrediting Agencies 
.GOV Reserved exclusively for the United States Government
General Services Administration
Attn: QTDC, 2E08 (.gov Domain Registration)
.INT Used only for registering organizations established by international treaties between governments
Internet Assigned Numbers Authority
.JOBS Reserved for human resource managers
Employ Media LLC
.MIL Reserved exclusively for the United States Military
DoD Network Information Center
.MOBI Reserved for consumers and providers of mobile products and services
mTLD Top Level Domain Limited dba dotMobi
.MUSEUM Reserved for museums
Museum Domain Management Association
.TEL Reserved for businesses and individuals to publish their contact data
Telnic Ltd.
.TRAVEL Reserved for entities whose primary area of activity is in the travel industry
Tralliance Registry Management Company, LLC.

Country Code Top-Level Domains (ccTLD)

Country code top-level domain names are those that are generally used for a specific country or dependent territory. All ccTLD identifiers are two letters long, and all two-letter top-level domains are ccTLDs.

Some countries use a second-level domain to represent the entity type (for example, for Chinese companies, or for Chinese organizations).

Domain Purpose / Sponsoring Organization
.AC Ascension Island
Network Information Center (AC Domain Registry)
c/o Cable and Wireless (Ascension Island)
.AD Andorra
STA Servei de Telecomunicacions d'Andorra
.AE United Arab Emirates
Telecommunication Regulatory Authority (TRA)
.AF Afghanistan
Ministry of Communications and IT
.AG Antigua and Barbuda
UHSA School of Medicine
.AI Anguilla
Government of Anguilla
.AL Albania
Electronic and Postal Communications Authority - AKEP
.AM Armenia
Internet Society
.AN Netherlands Antilles
University of The Netherlands Antilles
.AO Angola
Faculdade de Engenharia da Universidade Agostinho Neto
.AQ Antarctica
Mott and Associates
.AR Argentina
MRECIC (Ministerio de Relaciones Exteriores,
Comercio Internacional y Culto)
.AS American Samoa
AS Domain Registry
.AT Austria
NIC.AT Internet Verwaltungs und Betriebsgesellschaft m.b.H
.AU Australia
.au Domain Administration (auDA)
.AW Aruba
.AX Aland Islands
Ålands landskapsregering
.AZ Azerbaijan
.BA Bosnia and Herzegovina
Universtiy Telinformatic Centre (UTIC)
.BB Barbados
Government of Barbados
Ministry of Economic Affairs and Development
Telecommunications Unit
.BD Bangladesh
Ministry of Post & Telecommunications
Bangladesh Secretariate
.BE Belgium
DNS BE vzw/asbl
.BF Burkina Faso
DELGI Delegational Generale Informatique
.BG Bulgaria
.BH Bahrain
.BI Burundi
Centre National de l'Informatique
.BJ Benin
Offices des Postes et Telecommunications
.BL Saint Barthelemy
Not assigned
.BM Bermuda
Registry General
Ministry of Labour and Immigration
.BN Brunei Darussalam
Jabatan Telekom Brunei
.BO Bolivia
Agencia para el Desarrollo de la Información de la Sociedad en Bolivia
.BR Brazil
Comite Gestor da Internet no Brasil
.BS Bahamas
The College of the Bahamas
.BT Bhutan
Ministry of Information and Communications
.BV Bouvet Island
.BW Botswana
University of Botswana
.BY Belarus
The State Centre of Security Information of Belarus Republic
.BZ Belize
University College of Belize
.CA Canada
Canadian Internet Registration Authority (CIRA)
Autorite Canadienne pour les Enregistrements Internet (ACEI)
.CC Cocos (Keeling) Islands
eNIC Cocos (Keeling) Islands Ltd.
Pty, d/b/a Island Internet Services
.CD Congo, The Democratic Republic of the
NIC Congo - Interpoint SARL
.CF Central African Republic
Societe Centrafricaine de Telecommunications (SOCATEL)
.CG Congo
ONPT Congo and Interpoint Switzerland
.CH Switzerland
SWITCH The Swiss Education & Research Network
.CI Cote d'Ivoire
INP-HB Institut National Polytechnique Felix Houphouet Boigny
.CK Cook Islands
Telecom Cook Islands Ltd.
.CL Chile
NIC Chile (University of Chile)
.CM Cameroon
Cameroon Telecommunications (CAMTEL)
.CN China
Chinese Academy of Sciences
The Computer Network Center
.CO Colombia
Universidad de Los Andes
NIC Colombia
.CR Costa Rica
National Academy of Sciences
Academia Nacional de Ciencias
.CU Cuba
Industria y San Jose
Capitolio Nacional
.CV Cape Verde
Instituto Superior de Engenharia e Ciencias do Mar
.CX Christmas Island
Christmas Island Internet Administration Limited
.CY Cyprus
University of Cyprus
.CZ Czech Republic
CZ.NIC, z.s.p.o
.DE Germany
.DJ Djibouti
Societe des Telecommunications Internationales de Djibouti (STID)
.DK Denmark
Dansk Internet Forum
.DM Dominica
DotDM Corporation
.DO Dominican Republic
Pontificia Universidad Catolica Madre y Maestra
Recinto Santo Tomas de Aquino
.DZ Algeria
.EC Ecuador
.EE Estonia
National Institute of Chemical Physics and Biophysics
.EG Egypt
Egyptian Universities Network (EUN)
Supreme Council of Universities
.EH Western Sahara
Not assigned
.ER Eritrea
Eritrea Telcommunication Services Corporation (EriTel)
.ES Spain
.ET Ethiopia
Ethiopian Telecommunications Corporation
.EU European Union
EURid vzw/asbl
.FI Finland
Finnish Communications Regulatory Authority
.FJ Fiji
The University of the South Pacific
IT Services
.FK Falkland Islands (Malvinas)
Falkland Islands Government
.FM Micronesia, Federated States of
FSM Telecommunications Corporation
.FO Faroe Islands
FO Council
.FR France
AFNIC (NIC France) - Immeuble International
.GA Gabon
Gabon Telecom
.GB United Kingdom
Reserved Domain - IANA
.GD Grenada
The National Telecommunications Regulatory Commission (NTRC)
.GE Georgia
.GF French Guiana
Net Plus
.GG Guernsey
Island Networks Ltd.
.GH Ghana
Network Computer Systems Limited
.GI Gibraltar
Sapphire Networks
.GL Greenland
TELE Greenland A/S
.GM Gambia
.GN Guinea
Centre National des Sciences Halieutiques de Boussoura
.GP Guadeloupe
Networking Technologies Group
.GQ Equatorial Guinea
.GR Greece
.GS South Georgia and the South Sandwich Islands
Government of South Georgia and South Sandwich Islands (GSGSSI)
.GT Guatemala
Universidad del Valle de Guatemala
.GU Guam
University of Guam
Computer Center
.GW Guinea-Bissau
Fundação IT & MEDIA Universidade de Bissao
.GY Guyana
University of Guyana
.HK Hong Kong
Hong Kong Internet Registration Corporation Ltd.
.HM Heard Island and McDonald Islands
HM Domain Registry
.HN Honduras
Red de Desarrollo Sostenible Honduras
.HR Croatia
CARNet - Croatian Academic and Research Network
.HT Haiti
Consortium FDS/RDDH
.HU Hungary
Council of Hungarian Internet Providers (CHIP)
.ID Indonesia
IDNIC-PPAU Mikroelektronika
.IE Ireland
University College Dublin
Computing Services
Computer Centre
.IL Israel
Internet Society of Israel
.IM Isle of Man
Isle of Man Government
.IN India
National Centre for Software Technology
.IO British Indian Ocean Territory
IO Top Level Domain Registry
Cable and Wireless
.IQ Iraq
National Communications and Media
Commission of Iraq
.IR Iran, Islamic Republic of
Institute for Studies in Theoretical Physics & Mathematics (IPM)
.IS Iceland
ISNIC - Internet Iceland ltd.
.IT Italy
.JE Jersey
Island Networks (Jersey) Ltd.
.JM Jamaica
University of West Indies
.JO Jordan
National Information Technology Centre
.JP Japan
Japan Registry Services Co., Ltd.
.KE Kenya
Kenya Network Information Center (KeNIC)
.KG Kyrgyzstan
AsiaInfo Telecommunication Enterprise
.KH Cambodia
Ministry of Post and Telecommunications
.KI Kiribati
Ministry of Communications, Transport, and Tourism Development
.KM Comoros
Comores Telecom
.KN Saint Kitts and Nevis
Ministry of Finance, Sustainable Development Information & Technology
.KP Korea, Democratic People's Republic of
Korea Computer Center
.KR Korea, Republic of
National Internet Development Agency of Korea (NIDA)
.KW Kuwait
Ministry of Communications
.KY Cayman Islands
The Information and Communications Technology Authority
.KZ Kazakhstan
Association of IT Companies of Kazakhstan
.LA Lao People's Democratic Republic
Lao National Internet Committee (LANIC)
Science Technology and Environment Agency
.LB Lebanon
American University of Beirut
Computing and Networking Services
.LC Saint Lucia
University of Puerto Rico
.LI Liechtenstein
Hochschule Liechtenstein
.LK Sri Lanka
Council for Information Technology
LK Domain Registrar
.LR Liberia
Data Technology Solutions, Inc.
.LS Lesotho
National University of Lesotho
.LT Lithuania
Kaunas University of Technology
Information Technology Development Institute
.LU Luxembourg
.LV Latvia
University of Latvia
Institute of Mathematics and Computer Science
Department of Network Solutions (DNS)
.LY Libyan Arab Jamahiriya
General Post and Telecommunication Company
.MA Morocco
Agence Nationale de Réglementation des Télécommunications (ANRT)
.MC Monaco
Gouvernement de Monaco
Direction des Telecommunications
.MD Moldova
MoldData S.E.
.ME Montenegro
Government of Montenegro
.MF Saint Martin
Not assigned
.MG Madagascar
NIC-MG (Network Information Center Madagascar)
.MH Marshall Islands
Cabinet Office
.MK Macedonia, The Former Yugoslav Republic of
Ministry of Foreign Relations
.ML Mali
.MM Myanmar
Ministry of Communications, Posts & Telegraphs
.MN Mongolia
Datacom Co., Ltd.
.MO Macao
University of Macau
.MP Northern Mariana Islands
Saipan Datacom, Inc.
.MQ Martinique
.MR Mauritania
University of Nouakchott
.MS Montserrat
MNI Networks Ltd.
.MT Malta
NIC (Malta)
.MU Mauritius
Internet Direct Ltd
.MV Maldives
Dhiraagu Pvt. Ltd. (DHIVEHINET)
.MW Malawi
Malawi Sustainable Development Network Programme
(Malawi SDNP)
.MX Mexico
ITESM - Campus Monterrey
.MY Malaysia
MYNIC Berhad
.MZ Mozambique
Centro de Informatica de Universidade Eduardo Mondlane
.NA Namibia
Namibian Network Information Center
.NC New Caledonia
Office des Postes et Telecommunications
.NE Niger
.NF Norfolk Island
Norfolk Island Data Services
.NG Nigeria
Nigerian Government c/o National Information Technology
Development Agency (NITDA)
.NI Nicaragua
Universidad Nacional del Ingernieria
Centro de Computo
.NL Netherlands
Stichting Internet Domeinregistratie Nederland
.NO Norway
.NP Nepal
Mercantile Communications Pvt. Ltd.
.NR Nauru
.NU Niue
Internet Users Society - Niue
.NZ New Zealand
.OM Oman
Oman Telecommunications Company
.PA Panama
Universidad Tecnologica de Panama
Panamanian Academic National Network
.PE Peru
Red Cientifica Peruana
.PF French Polynesia
Ministère des Postes et Télécommunications et des sports, chargé
des nouvelles technologies de l'information
.PG Papua New Guinea
PNG DNS Administration
Vice Chancellors Office
The Papua New Guinea University of Technology
.PH Philippines
PH Domain Foundation
.PK Pakistan
.PL Poland
Research and Academic Computer Network
.PM Saint Pierre and Miquelon
AFNIC (NIC France) - Immeuble International
.PN Pitcairn
Pitcairn Island Administration
.PR Puerto Rico
Gauss Research Laboratory Inc.
.PS Palestinian Territory, Occupied
Ministry Of Telecommunications &
Information Technology,
Government Computer Center.
.PT Portugal
Fundacao para a Computacao Cientifica Nacional
.PW Palau
Micronesia Investment and Development Corporation
.PY Paraguay
.QA Qatar
Qatar Telecom (Q-Tel) Q.S.C.
.RE Reunion
AFNIC (NIC France) - Immeuble International
.RO Romania
National Institute for R&D in Informatics
.RS Serbia
Serbian National Register of
Internet Domain Names
.RU Russian Federation
Coordination Center for TLD RU
.RW Rwanda
NIC Congo - Interpoint SARL
.SA Saudi Arabia
Communications and Information Technology Commission
.SB Solomon Islands
Solomon Telekom Company Limited
.SC Seychelles
VCS Pty Ltd
.SD Sudan
Sudan Internet Society
.SE Sweden
The Internet Infrastructure Foundation
.SG Singapore
Singapore Network Information Centre (SGNIC) Pte Ltd
.SH Saint Helena
Government of St. Helena
.SI Slovenia
Academic and Research Network of Slovenia (ARNES)
.SJ Svalbard and Jan Mayen
.SK Slovakia
SK-NIC, a.s.
.SL Sierra Leone
.SM San Marino
Telecom Italia San Marino S.p.A.
.SN Senegal
Universite Cheikh Anta Diop
NIC Senegal
.SO Somalia
World Class Domains
c/o Monolith Innovation Group
.SR Suriname
.ST Sao Tome and Principe
.SU Soviet Union (being phased out)
Russian Institute for Development of Public Networks
.SV El Salvador
Col. Medica
Dr. Emilio Alvarez
.SY Syrian Arab Republic
Syrian Telecommunications Establishment (STE)
.SZ Swaziland
University of Swaziland
Department of Computer Science
.TC Turks and Caicos Islands
Melrex TC
.TD Chad
Société des télécommunications du Tchad (SOTEL TCHAD)
.TF French Southern Territories
AFNIC (NIC France) - Immeuble International
.TG Togo
.TH Thailand
Thai Network Information Center Foundation
.TJ Tajikistan
Information Technology Center
.TK Tokelau
Telecommunication Tokelau Corporation (Teletok)
.TL Timor-Leste
Ministry of Infrastructure
Information and Technology Division
.TM Turkmenistan
TM Domain Registry Ltd
.TN Tunisia
Agence Tunisienne d'Internet
.TO Tonga
Government of the Kingdom of Tonga
H.R.H. Crown Prince Tupouto'a
c/o Consulate of Tonga
.TP Portuguese Timor (being phased out)
.TR Turkey
Middle East Technical University
Department of Computer Engineering
.TT Trinidad and Tobago
University of the West Indies
Faculty of Engineering
.TV Tuvalu
Ministry of Finance and Tourism
.TW Taiwan
Taiwan Network Information Center (TWNIC)
.TZ Tanzania, United Republic of
University of Dar Es Salaam
.UA Ukraine
Communication Systems Ltd
.UG Uganda
Uganda Online Ltd.
.UK United Kingdom
Nominet UK
.UM United States Minor Outlying Islands
Not assigned
.US United States
NeuStar, Inc.
Loudon Tech Center
.UY Uruguay
SeCIU - Universidad de la Republica
.UZ Uzbekistan
Computerization and Information Technologies Developing Center
.VA Holy See (Vatican City State)
Holy See Secretariat of State
Internet Office of the Holy See
.VC Saint Vincent and the Grenadines
Ministry of Telecommunications, Science, Technology and Industry
.VE Venezuela
Centro Nacional de Tecnologias de Informacion
.VG Virgin Islands, British
Pinebrook Developments Ltd
.VI Virgin Islands, U.S.
Virgin Islands Public Telcommunications System
c/o COBEX Internet Services
.VN Viet Nam
Ministry of Post and Telematics
.VU Vanuatu
Telecom Vanuatu Limited
.WF Wallis and Futuna
AFNIC (NIC France) - Immeuble International
.WS Samoa
Government of Samoa
Ministry of Foreign Affairs
.YE Yemen
.YT Mayotte
AFNIC (NIC France) - Immeuble International
.YU Yugoslavia (being phased out)
Serbian National Register of Internet Domain Names (temporary caretaker)
.ZA South Africa
ZA Domain Name Authority
.ZM Zambia
ZAMNET Communication Systems Ltd.
.ZW Zimbabwe
Postal and Telecommunications Regulatory Authority of Zimbabwe (POTRAZ)

Reserved Top-Level Domains

The following top-level domains are reserved by the Internet Assigned Numbers Authority (IANA).

Note that some of the internationalized domains may not display correctly. This will depend on the character sets supported by your computer.

Domain Purpose / Sponsoring Organization
.TEST For use in testing of current or new DNS related code
Internet Assigned Numbers Authority
.EXAMPLE For use in documentation or as examples
Internet Assigned Numbers Authority
.INVALID Intended for use in online construction of domain names that are sure to be invalid and which it is obvious at a glance are invalid
Internet Assigned Numbers Authority
.LOCALHOST Reserved to avoid conflict with the traditional use of localhost. Localhost has traditionally been statically defined in host DNS implementations as having an A record pointing to the loop back IP address and is reserved for such use. Any other use would conflict with widely deployed code which assumes this use.
Internet Assigned Numbers Authority
.TEST Recommended for use in testing of current or new DNS related code
Internet Assigned Numbers Authority
.ARPA Reserved exclusively to support operationally-critical infrastructural identifier spaces as advised by the Internet Architecture Board
Internet Assigned Numbers Authority
.INT Used only for registering organizations established by international treaties between governments
Internet Assigned Numbers Authority
Reserved for testing internationalized domain names
Internet Assigned Numbers Authority
Reserved for testing internationalized domain names
Internet Assigned Numbers Authority
Reserved for testing internationalized domain names
Internet Assigned Numbers Authority
Reserved for testing internationalized domain names
Internet Assigned Numbers Authority
Reserved for testing internationalized domain names
Internet Assigned Numbers Authority
Reserved for testing internationalized domain names
Internet Assigned Numbers Authority
Reserved for testing internationalized domain names
Internet Assigned Numbers Authority
Reserved for testing internationalized domain names
Internet Assigned Numbers Authority
Reserved for testing internationalized domain names
Internet Assigned Numbers Authority
Reserved for testing internationalized domain names
Internet Assigned Numbers Authority
Reserved for testing internationalized domain names
Internet Assigned Numbers Authority

Registering Domain Names

You can register top-level domain names via ZappyHost.