当今Internet顶级域分为通用顶级域名（gTLD），国家（地区）代码顶级域名（ccTLD），国际化顶级域名（IDN TLD）三类。

通用顶级域名（gTLD）

国家（地区）代码顶级域名（ccTLD）

国际化顶级域名（IDN TLD）

通用顶级域名（gTLD）

.COM

注册于1985年1月1日 设计用于营利性机构，现通用。Registry：VeriSign Global Registry Services。

.NET

注册于1985年1月1日 设计用于网络服务机构，现通用。Registry：VeriSign Global Registry Services。

.ORG

注册于1985年1月1日 设计用于非营利性组织，现通用。Registry：Public Interest Registry (PIR)。

.EDU

注册于1985年1月1日 用于美国教育机构。Registry：EDUCAUSE。

.GOV

注册于1985年1月1日 用于美国政府机构。Registry：General Services Administration.

.MIL

注册于1985年1月1日 用于美国军事机构。Registry：DoD Network Information Center

.ARPA

注册于1985年1月1日 用于DNS反向地址解析。Registry：Internet Assigned Numbers Authority(IANA)

.INT

注册于1988年11月3日 用于国际组织。Registry：Internet Assigned Numbers Authority(IANA)

.BIZ

注册于2001年6月26日 用于商业。Registry：NeuStar, Inc.

.INFO

注册于2001年6月26日 通用。Registry：Afilias Limited.

.NAME

注册于2001年8月17日 用于个人。Registry：The Global Name Registry Ltd.

.MUSEUM

注册于2001年10月20日 用于博物馆。Registry：Museum Domain Management Association

.COOP

注册于2001年12月13日 用于合作组织。Registry：DotCooperation LLC

.AERO

注册于2001年12月21日 用于航空运输业。Registry：Societe Internationale de Telecommunications Aeronautique S.C.

.PRO

注册于2002年5月8日 用于医生，律师等专业人士，该域未向所有国家开放。Registry：Registry Services Corporation dba RegistryPro

.TRAVEL

注册于2005年7月27日 用于旅游业。Registry：Tralliance Registry Management Company, LLC.

.JOBS

注册于2005年9月8日 用于人力资源管理者。Registry：Employ Media LLC

.MOBI

注册于2005年10月17日 用于为移动终端服务。Registry：mTLD Top Level Domain Limited dba dotMobi

.CAT

注册于2005年12月19日 用于保护Catalan语言和文化。Registry：Fundacio puntCAT

.TEL

注册于2007年3月1日 用于个人和组织发布自己的联系信息。Registry：Telnic Ltd.

.ASIA

注册于2007年5月2日 用于亚洲和太平洋地区。Registry：香港DotAsia Organisation Ltd.

国家（地区）代码顶级域名（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)

国际化顶级域名（IDN TLD）

目前ICANN在根区中加入的IDN ccTLD为测试域名 ".测试" 以及其相关的译文(不包含英文".test")：

.测试 (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

.测试 (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