| .miami | Generic | Registry Services, LLC | — | — |
| .microsoft | Generic | Microsoft Corporation | — | — |
| .mil | Sponsored | DoD Network Information Center | — | — |
| .mini | Generic | Bayerische Motoren Werke Aktiengesellschaft | — | — |
| .mint | Generic | Intuit Administrative Services, Inc. | — | — |
| .mit | Generic | Massachusetts Institute of Technology | — | — |
| .mitsubishi | Generic | Mitsubishi Corporation | — | — |
| .mk | Country Code | Macedonian Academic Research Network Skopje | 🇲🇰North Macedonia | — |
| .ml | Country Code | Agence des Technologies de l’Information et de la Communication | 🇲🇱Mali | — |
| .mlb | Generic | MLB Advanced Media DH, LLC | — | — |
| .mls | Generic | The Canadian Real Estate Association | — | — |
| .mm | Country Code | Ministry of Transport and Communications | 🇲🇲Myanmar | — |
| .mma | Generic | MMA IARD | — | — |
| .mn | Country Code | Datacom Co., Ltd. | 🇲🇳Mongolia | — |
| .mo | Country Code | Macao Post and Telecommunications Bureau (CTT) | 🇲🇴Macao | — |
| .mobi | Generic | Identity Digital Limited | — | — |
| .mobile | Generic | Dish DBS Corporation | — | — |
| .moda | Generic | Dog Beach, LLC | — | — |
| .moe | Generic | Interlink Systems Innovation Institute K.K. | — | — |
| .moi | Generic | Amazon Registry Services, Inc. | — | — |
| .mom | Generic | XYZ.COM LLC | — | — |
| .monash | Generic | Monash University | — | — |
| .money | Generic | Binky Moon, LLC | — | — |
| .monster | Generic | XYZ.COM LLC | — | — |
| .mormon | Generic | IRI Domain Management, LLC ("Applicant") | — | — |
| .mortgage | Generic | Dog Beach, LLC | — | — |
| .moscow | Generic | Foundation for Assistance for Internet Technologies and Infrastructure Development (FAITID) | — | — |
| .moto | Generic | Motorola Trademark Holdings, LLC | — | — |
| .motorcycles | Generic | XYZ.COM LLC | — | — |
| .mov | Generic | Charleston Road Registry Inc. | — | — |
| .movie | Generic | Binky Moon, LLC | — | — |
| .mp | Country Code | Saipan Datacom, Inc. | 🇲🇵Northern Mariana Islands | — |
| .mq | Country Code | CANAL+ TELECOM | 🇲🇶Martinique | — |
| .mr | Country Code | Université de Nouakchott Al Aasriya | 🇲🇷Mauritania | — |
| .ms | Country Code | MNI Networks Ltd. | 🇲🇸Montserrat | — |
| .msd | Generic | MSD Registry Holdings, Inc. | — | — |
| .mt | Country Code | NIC (Malta) | 🇲🇹Malta | — |
| .mtn | Generic | MTN Dubai Limited | — | — |
| .mtr | Generic | MTR Corporation Limited | — | — |
| .mu | Country Code | Internet Direct Ltd | 🇲🇺Mauritius | — |
| .museum | Sponsored | Museum Domain Management Association | — | — |
| .music | Generic | DotMusic Limited | — | — |
| .mv | Country Code | Dhivehi Raajjeyge Gulhun PLC | 🇲🇻Maldives | — |
| .mw | Country Code | Malawi Sustainable Development Network Programme (Malawi SDNP) | 🇲🇼Malawi | — |
| .mx | Country Code | NIC-Mexico
ITESM - Campus Monterrey | 🇲🇽Mexico | — |
| .my | Country Code | MYNIC Berhad | 🇲🇾Malaysia | — |
| .mz | Country Code | Centro de Informatica de Universidade Eduardo Mondlane | 🇲🇿Mozambique | — |
| .na | Country Code | Namibian Network Information Center | 🇳🇦Namibia | — |
| .nab | Generic | National Australia Bank Limited | — | — |
| .nagoya | Generic | GMO Registry, Inc. | — | — |