| .닷넷 | Generic | VeriSign Sarl | — | — |
| .닷컴 | Generic | VeriSign Sarl | — | — |
| .삼성 | Generic | SAMSUNG SDS CO., LTD | — | — |
| .한국 | Country Code | KISA (Korea Internet & Security Agency) | 𬜁𩼒한국 | — |
| .aaa | Generic | American Automobile Association, Inc. | — | — |
| .aarp | Generic | AARP | — | — |
| .abb | Generic | ABB Ltd | — | — |
| .abbott | Generic | Abbott Laboratories, Inc. | — | — |
| .abbvie | Generic | AbbVie Inc. | — | — |
| .abc | Generic | Disney Enterprises, Inc. | — | — |
| .able | Generic | Able Inc. | — | — |
| .abogado | Generic | Registry Services, LLC | — | — |
| .abudhabi | Generic | Abu Dhabi Systems and Information Centre | — | — |
| .ac | Country Code | Internet Computer Bureau Limited | 🇦🇨Ascension Island | — |
| .academy | Generic | Binky Moon, LLC | — | — |
| .accenture | Generic | Accenture plc | — | — |
| .accountant | Generic | dot Accountant Limited | — | — |
| .accountants | Generic | Binky Moon, LLC | — | — |
| .aco | Generic | ACO Severin Ahlmann GmbH & Co. KG | — | — |
| .actor | Generic | Dog Beach, LLC | — | — |
| .ad | Country Code | Andorra Telecom | 🇦🇩Andorra | — |
| .ads | Generic | Charleston Road Registry Inc. | — | — |
| .adult | Generic | ICM Registry AD LLC | — | — |
| .ae | Country Code | Telecommunications and Digital Government Regulatory Authority (TDRA) | 🇦🇪United Arab Emirates | — |
| .aeg | Generic | Aktiebolaget Electrolux | — | — |
| .aero | Sponsored | Societe Internationale de Telecommunications Aeronautique (SITA INC USA) | — | — |
| .aetna | Generic | Aetna Life Insurance Company | — | — |
| .af | Country Code | Ministry of Communications and IT | 🇦🇫Afghanistan | — |
| .afl | Generic | Australian Football League | — | — |
| .africa | Generic | ZA Central Registry NPC trading as Registry.Africa | — | — |
| .ag | Country Code | UHSA School of Medicine | 🇦🇬Antigua and Barbuda | — |
| .agakhan | Generic | Fondation Aga Khan (Aga Khan Foundation) | — | — |
| .agency | Generic | Binky Moon, LLC | — | — |
| .ai | Country Code | Government of Anguilla | 🇦🇮Anguilla | — |
| .aig | Generic | American International Group, Inc. | — | — |
| .airbus | Generic | Airbus S.A.S. | — | — |
| .airforce | Generic | Dog Beach, LLC | — | — |
| .airtel | Generic | Bharti Airtel Limited | — | — |
| .akdn | Generic | Fondation Aga Khan (Aga Khan Foundation) | — | — |
| .al | Country Code | Electronic and Postal Communications Authority - AKEP | 🇦🇱Albania | — |
| .alibaba | Generic | Alibaba Group Holding Limited | — | — |
| .alipay | Generic | Alibaba Group Holding Limited | — | — |
| .allfinanz | Generic | Allfinanz Deutsche Vermögensberatung Aktiengesellschaft | — | — |
| .allstate | Generic | Allstate Fire and Casualty Insurance Company | — | — |
| .ally | Generic | Ally Financial Inc. | — | — |
| .alsace | Generic | REGION GRAND EST | — | — |
| .alstom | Generic | ALSTOM | — | — |
| .am | Country Code | "Internet Society" Non-governmental Organization | 🇦🇲Armenia | — |
| .amazon | Generic | Amazon Registry Services, Inc. | — | — |
| .americanexpress | Generic | American Express Travel Related Services Company, Inc. | — | — |