| .band | Generic | Dog Beach, LLC | — | — |
| .bank | Generic | fTLD Registry Services, LLC | — | — |
| .bar | Generic | Punto 2012 Sociedad Anonima Promotora de Inversion de Capital Variable | — | — |
| .barcelona | Generic | Municipi de Barcelona | — | — |
| .barclaycard | Generic | Barclays Bank PLC | — | — |
| .barclays | Generic | Barclays Bank PLC | — | — |
| .barefoot | Generic | Gallo Vineyards, Inc. | — | — |
| .bargains | Generic | Binky Moon, LLC | — | — |
| .baseball | Generic | MLB Advanced Media DH, LLC | — | — |
| .basketball | Generic | Fédération Internationale de Basketball (FIBA) | — | — |
| .bauhaus | Generic | Werkhaus GmbH | — | — |
| .bayern | Generic | Bayern Connect GmbH | — | — |
| .bb | Country Code | Ministry of Innovation, Science and Smart Technology | 🇧🇧Barbados | — |
| .bbc | Generic | British Broadcasting Corporation | — | — |
| .bbt | Generic | BB&T Corporation | — | — |
| .bbva | Generic | BANCO BILBAO VIZCAYA ARGENTARIA, S.A. | — | — |
| .bcg | Generic | The Boston Consulting Group, Inc. | — | — |
| .bcn | Generic | Municipi de Barcelona | — | — |
| .bd | Country Code | Posts and Telecommunications Division | 🇧🇩Bangladesh | — |
| .be | Country Code | DNS Belgium vzw/asbl | 🇧🇪Belgium | — |
| .beats | Generic | Beats Electronics, LLC | — | — |
| .beauty | Generic | XYZ.COM LLC | — | — |
| .beer | Generic | Registry Services, LLC | — | — |
| .berlin | Generic | dotBERLIN GmbH & Co. KG | — | — |
| .best | Generic | BestTLD Pty Ltd | — | — |
| .bestbuy | Generic | BBY Solutions, Inc. | — | — |
| .bet | Generic | Identity Digital Limited | — | — |
| .bf | Country Code | Autorité de Régulation des Communications Electroniques et des Postes (ARCEP) | 🇧🇫Burkina Faso | — |
| .bg | Country Code | Register.BG | 🇧🇬Bulgaria | — |
| .bh | Country Code | Telecommunications Regulatory Authority (TRA) | 🇧🇭Bahrain | — |
| .bharti | Generic | Bharti Enterprises (Holding) Private Limited | — | — |
| .bi | Country Code | Centre National de l'Informatique | 🇧🇮Burundi | — |
| .bible | Generic | American Bible Society | — | — |
| .bid | Generic | dot Bid Limited | — | — |
| .bike | Generic | Binky Moon, LLC | — | — |
| .bing | Generic | Microsoft Corporation | — | — |
| .bingo | Generic | Binky Moon, LLC | — | — |
| .bio | Generic | Identity Digital Limited | — | — |
| .biz | Generic Restricted | Registry Services, LLC | — | — |
| .bj | Country Code | Autorité de Régulation des Communications Electroniques et de la Poste du Bénin (ARCEP BENIN) | 🇧🇯Benin | — |
| .black | Generic | Identity Digital Limited | — | — |
| .blackfriday | Generic | Registry Services, LLC | — | — |
| .blockbuster | Generic | Dish DBS Corporation | — | — |
| .blog | Generic | Knock Knock WHOIS There, LLC | — | — |
| .bloomberg | Generic | Bloomberg IP Holdings LLC | — | — |
| .blue | Generic | Identity Digital Limited | — | — |
| .bm | Country Code | Registry General Department, Ministry of Home Affairs | 🇧🇲Bermuda | — |
| .bms | Generic | Bristol-Myers Squibb Company | — | — |
| .bmw | Generic | Bayerische Motoren Werke Aktiengesellschaft | — | — |
| .bn | Country Code | Authority for Info-communications Technology Industry of Brunei Darussalam (AITI) | 🇧🇳Brunei | — |