| .hot | Generic | Amazon Registry Services, Inc. | — | — |
| .hotels | Generic | Booking.com B.V. | — | — |
| .hotmail | Generic | Microsoft Corporation | — | — |
| .house | Generic | Binky Moon, LLC | — | — |
| .how | Generic | Charleston Road Registry Inc. | — | — |
| .hr | Country Code | CARNet - Croatian Academic and Research Network | 🇭🇷Croatia | — |
| .hsbc | Generic | HSBC Global Services (UK) Limited | — | — |
| .ht | Country Code | Consortium FDS/RDDH | 🇭🇹Haiti | — |
| .hu | Country Code | Council of Hungarian Internet Providers (CHIP) | 🇭🇺Hungary | — |
| .hughes | Generic | Hughes Satellite Systems Corporation | — | — |
| .hyatt | Generic | Hyatt GTLD, L.L.C. | — | — |
| .hyundai | Generic | Hyundai Motor Company | — | — |
| .ibm | Generic | International Business Machines Corporation | — | — |
| .icbc | Generic | Industrial and Commercial Bank of China Limited | — | — |
| .ice | Generic | IntercontinentalExchange, Inc. | — | — |
| .icu | Generic | Shortdot SA | — | — |
| .id | Country Code | Perkumpulan Pengelola Nama Domain Internet Indonesia (PANDI) | 🇮🇩Indonesia | — |
| .ie | Country Code | University College Dublin, Computing Services, Computer Centre | 🇮🇪Ireland | — |
| .ieee | Generic | IEEE Global LLC | — | — |
| .ifm | Generic | ifm electronic gmbh | — | — |
| .ikano | Generic | Ikano S.A. | — | — |
| .il | Country Code | The Israel Internet Association (RA) | 🇮🇱Israel | — |
| .im | Country Code | Isle of Man Government | 🇮🇲Isle of Man | — |
| .imamat | Generic | Fondation Aga Khan (Aga Khan Foundation) | — | — |
| .imdb | Generic | Amazon Registry Services, Inc. | — | — |
| .immo | Generic | Binky Moon, LLC | — | — |
| .immobilien | Generic | Dog Beach, LLC | — | — |
| .in | Country Code | National Internet Exchange of India | 🇮🇳India | — |
| .inc | Generic | Intercap Registry Inc. | — | — |
| .industries | Generic | Binky Moon, LLC | — | — |
| .infiniti | Generic | NISSAN MOTOR CO., LTD. | — | — |
| .info | Generic | Identity Digital Limited | — | — |
| .ing | Generic | Charleston Road Registry Inc. | — | — |
| .ink | Generic | Registry Services, LLC | — | — |
| .institute | Generic | Binky Moon, LLC | — | — |
| .insurance | Generic | fTLD Registry Services LLC | — | — |
| .insure | Generic | Binky Moon, LLC | — | — |
| .int | Sponsored | Internet Assigned Numbers Authority | — | — |
| .international | Generic | Binky Moon, LLC | — | — |
| .intuit | Generic | Intuit Administrative Services, Inc. | — | — |
| .investments | Generic | Binky Moon, LLC | — | — |
| .io | Country Code | Internet Computer Bureau Limited | 🇮🇴British Indian Ocean Territory | — |
| .ipiranga | Generic | Ipiranga Produtos de Petroleo S.A. | — | — |
| .iq | Country Code | Communications and Media Commission (CMC) | 🇮🇶Iraq | — |
| .ir | Country Code | Institute for Research in Fundamental Sciences | 🇮🇷Iran | — |
| .irish | Generic | Binky Moon, LLC | — | — |
| .is | Country Code | ISNIC - Internet á Íslandi hf. | 🇮🇸Iceland | — |
| .ismaili | Generic | Fondation Aga Khan (Aga Khan Foundation) | — | — |
| .ist | Generic | Istanbul Metropolitan Municipality | — | — |
| .istanbul | Generic | Istanbul Metropolitan Municipality | — | — |