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當今Internet頂級域分為通用頂級域名(gTLD),國家(地區)代碼頂級域名(ccTLD),國際化頂級域名(IDN TLD)三類。

1通用頂級域名(gTLD)

.COM
註冊於1985年1月1日 設計用於營利性機構,現通用。Registry:VeriSign Global Registry Services。
.NET
註冊於1985年1月1日 設計用於網路服務機構,現通用。Registry:VeriSign Global Registry Services。
.ORG
註冊於1985年1月1日 設計用於非營利性組織,現通用。Registry:Public Interest Registry (PIR)。
.EDU
註冊於1985年1月1日 用於美國教育機構。Registry:EDUCAUSE。
.GOV
註冊於1985年1月1日 用於美國政府機構。Registry:General Services Administration.
.MIL
註冊於1985年1月1日 用於美國軍事機構。Registry:DoD Network Information Center
.ARPA
註冊於1985年1月1日 用於DNS反向地址解析。Registry:Internet Assigned Numbers Authority(IANA)
.INT
註冊於1988年11月3日 用於國際組織。Registry:Internet Assigned Numbers Authority(IANA)
.BIZ
註冊於2001年6月26日 用於商業。Registry:NeuStar, Inc.
.INFO
註冊於2001年6月26日 通用。Registry:Afilias Limited.
.NAME
註冊於2001年8月17日 用於個人。Registry:The Global Name Registry Ltd.
.MUSEUM
註冊於2001年10月20日 用於博物館。Registry:Museum Domain Management Association
.COOP
註冊於2001年12月13日 用於合作組織。Registry:DotCooperation LLC
.AERO
註冊於2001年12月21日 用於航空運輸業。Registry:Societe Internationale de Telecommunications Aeronautique S.C.
.PRO
註冊於2002年5月8日 用於醫生,律師等專業人士,該域未向所有國家開放。Registry:Registry Services Corporation dba RegistryPro
.TRAVEL
註冊於2005年7月27日 用於旅遊業。Registry:Tralliance Registry Management Company, LLC.
.JOBS
註冊於2005年9月8日 用於人力資源管理者。Registry:Employ Media LLC
.MOBI
註冊於2005年10月17日 用於為移動終端服務。Registry:mTLD Top Level Domain Limited dba dotMobi
.CAT
註冊於2005年12月19日 用於保護Catalan語言和文化。Registry:Fundacio puntCAT
.TEL
註冊於2007年3月1日 用於個人和組織發布自己的聯繫信息。Registry:Telnic Ltd.
.ASIA
註冊於2007年5月2日 用於亞洲和太平洋地區。Registry:香港DotAsia Organisation Ltd.

2國家(地區)代碼頂級域名(ccTLD)

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

3 國際化頂級域名(IDN TLD)

目前ICANN在根區中加入的IDN ccTLD為測試域名 ".測試" 以及其相關的譯文(不包含英文".test"):
.測試 (xn--0zwm56d)
test:zh-Hans test Reserved for testing internationalised domain names Internet Assigned Numbers Authority
.परीक्षा (xn--11b5bs3a9aj6g)
test:hi-Deva test Reserved for testing internationalised domain names Internet Assigned Numbers Authority
.испытание (xn--80akhbyknj4f)
test:ru-Cyrl test Reserved for testing internationalised domain names Internet Assigned Numbers Authority
.테스트 (xn--9t4b11yi5a)
test:ko-Hang test Reserved for testing internationalised domain names Internet Assigned Numbers Authority
.טעסט (xn--deba0ad)
test:yi-Hebr test Reserved for testing internationalised domain names Internet Assigned Numbers Authority
.測試 (xn--g6w251d)
test:zh-Hant test Reserved for testing internationalised domain names Internet Assigned Numbers Authority
.آزمایشی (xn--hgbk6aj7f53bba)
test:fa-Arab test Reserved for testing internationalised domain names Internet Assigned Numbers Authority
.பரிட்சை (xn--hlcj6aya9esc7a)
test:ta-Taml test Reserved for testing internationalised domain names Internet Assigned Numbers Authority
.δοκιμή (xn--jxalpdlp)
test:el-Grek test Reserved for testing internationalised domain names Internet Assigned Numbers Authority
.إختبار (xn--kgbechtv)
test:ar-Arab test Reserved for testing internationalised domain names Internet Assigned Numbers Authority
.テスト (xn--zckzah)
test:ja-Kana test Reserved for testing internationalised domain names Internet Assigned Numbers Authority
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