| .닷넷 | VeriSign Sarl | — |
| .닷컴 | VeriSign Sarl | — |
| .삼성 | SAMSUNG SDS CO., LTD | — |
| .aaa | American Automobile Association, Inc. | — |
| .aarp | AARP | — |
| .abb | ABB Ltd | — |
| .abbott | Abbott Laboratories, Inc. | — |
| .abbvie | AbbVie Inc. | — |
| .abc | Disney Enterprises, Inc. | — |
| .able | Able Inc. | — |
| .abogado | Registry Services, LLC | — |
| .abudhabi | Abu Dhabi Systems and Information Centre | — |
| .academy | Binky Moon, LLC | — |
| .accenture | Accenture plc | — |
| .accountant | dot Accountant Limited | — |
| .accountants | Binky Moon, LLC | — |
| .aco | ACO Severin Ahlmann GmbH & Co. KG | — |
| .actor | Dog Beach, LLC | — |
| .ads | Charleston Road Registry Inc. | — |
| .adult | ICM Registry AD LLC | — |
| .aeg | Aktiebolaget Electrolux | — |
| .aetna | Aetna Life Insurance Company | — |
| .afl | Australian Football League | — |
| .africa | ZA Central Registry NPC trading as Registry.Africa | — |
| .agakhan | Fondation Aga Khan (Aga Khan Foundation) | — |
| .agency | Binky Moon, LLC | — |
| .aig | American International Group, Inc. | — |
| .airbus | Airbus S.A.S. | — |
| .airforce | Dog Beach, LLC | — |
| .airtel | Bharti Airtel Limited | — |
| .akdn | Fondation Aga Khan (Aga Khan Foundation) | — |
| .alibaba | Alibaba Group Holding Limited | — |
| .alipay | Alibaba Group Holding Limited | — |
| .allfinanz | Allfinanz Deutsche Vermögensberatung Aktiengesellschaft | — |
| .allstate | Allstate Fire and Casualty Insurance Company | — |
| .ally | Ally Financial Inc. | — |
| .alsace | REGION GRAND EST | — |
| .alstom | ALSTOM | — |
| .amazon | Amazon Registry Services, Inc. | — |
| .americanexpress | American Express Travel Related Services Company, Inc. | — |
| .americanfamily | AmFam, Inc. | — |
| .amex | American Express Travel Related Services Company, Inc. | — |
| .amfam | AmFam, Inc. | — |
| .amica | Amica Mutual Insurance Company | — |
| .amsterdam | Gemeente Amsterdam | — |
| .analytics | Campus IP LLC | — |
| .android | Charleston Road Registry Inc. | — |
| .anquan | Beijing Qihu Keji Co., Ltd. | — |
| .anz | Australia and New Zealand Banking Group Limited | — |
| .aol | Yahoo Inc. | — |