| .americanfamily | Generic | AmFam, Inc. | — | — |
| .amex | Generic | American Express Travel Related Services Company, Inc. | — | — |
| .amfam | Generic | AmFam, Inc. | — | — |
| .amica | Generic | Amica Mutual Insurance Company | — | — |
| .amsterdam | Generic | Gemeente Amsterdam | — | — |
| .analytics | Generic | Campus IP LLC | — | — |
| .android | Generic | Charleston Road Registry Inc. | — | — |
| .anquan | Generic | Beijing Qihu Keji Co., Ltd. | — | — |
| .anz | Generic | Australia and New Zealand Banking Group Limited | — | — |
| .ao | Country Code | Ministry of Telecommunications and Information Technologies (MTTI) | 🇦🇴Angola | — |
| .aol | Generic | Yahoo Inc. | — | — |
| .apartments | Generic | Binky Moon, LLC | — | — |
| .app | Generic | Charleston Road Registry Inc. | — | — |
| .apple | Generic | Apple Inc. | — | — |
| .aq | Country Code | Antarctica Network Information Centre Limited | 🇦🇶Antarctica | — |
| .aquarelle | Generic | Aquarelle.com | — | — |
| .ar | Country Code | Presidencia de la Nación , Secretaría Legal y Técnica | 🇦🇷Argentina | — |
| .arab | Generic | League of Arab States | — | — |
| .aramco | Generic | Aramco Services Company | — | — |
| .archi | Generic | Identity Digital Limited | — | — |
| .army | Generic | Dog Beach, LLC | — | — |
| .arpa | Infrastructure | Internet Architecture Board (IAB) | — | — |
| .art | Generic | UK Creative Ideas Limited | — | — |
| .arte | Generic | Association Relative à la Télévision Européenne G.E.I.E. | — | — |
| .as | Country Code | AS Domain Registry | 🇦🇸American Samoa | — |
| .asda | Generic | Asda Stores Limited | — | — |
| .asia | Sponsored | DotAsia Organisation Ltd. | — | — |
| .associates | Generic | Binky Moon, LLC | — | — |
| .at | Country Code | nic.at GmbH | 🇦🇹Austria | — |
| .athleta | Generic | The Gap, Inc. | — | — |
| .attorney | Generic | Dog Beach, LLC | — | — |
| .au | Country Code | .au Domain Administration (auDA) | 🇦🇺Australia | — |
| .auction | Generic | Dog Beach, LLC | — | — |
| .audi | Generic | AUDI Aktiengesellschaft | — | — |
| .audible | Generic | Amazon Registry Services, Inc. | — | — |
| .audio | Generic | XYZ.COM LLC | — | — |
| .auspost | Generic | Australian Postal Corporation | — | — |
| .author | Generic | Amazon Registry Services, Inc. | — | — |
| .auto | Generic | XYZ.COM LLC | — | — |
| .autos | Generic | XYZ.COM LLC | — | — |
| .aw | Country Code | SETAR | 🇦🇼Aruba | — |
| .aws | Generic | AWS Registry LLC | — | — |
| .ax | Country Code | Ålands landskapsregering | 🇦🇽Aland Islands | — |
| .axa | Generic | AXA Group Operations SAS | — | — |
| .az | Country Code | IntraNS | 🇦🇿Azerbaijan | — |
| .azure | Generic | Microsoft Corporation | — | — |
| .ba | Country Code | University Tele-Informatic Center (UTIC) | 🇧🇦Bosnia and Herzegovina | — |
| .baby | Generic | XYZ.COM LLC | — | — |
| .baidu | Generic | Baidu, Inc. | — | — |
| .banamex | Generic | Citigroup Inc. | — | — |