Registrars: O
19 registrars
| Registrar | IANA ID | Country | Registrar family | Website |
|---|---|---|---|---|
| Octopusdomains.net LLC | 1223 | United States | — | networksolutions.com |
| ODTÜ Geliştirme Vakfi Bilgi Teknolojileri Sanayi Ve Ticaret Anonim Şirketi | 3871 | Türkiye | — | metunic.com.tr |
| Old Tyme Domains, LLC | 2350 | United States | — | networksolutions.com |
| OldTownDomains.com LLC | 1224 | United States | — | networksolutions.com |
| OldWorldAliases.com LLC | 1225 | United States | — | networksolutions.com |
| One Putt, LLC | 923 | United States | — | networksolutions.com |
| One.com A/S | 1462 | Denmark | — | one.com |
| OnlineNIC, Inc. | 82 | United States | — | onlinenic.com |
| Onpassive Technologies L.L.C | 1332 | United Arab Emirates | — | odomain.com |
| OpusDNS GmbH | 4340 | Germany | — | opusdns.com |
| ORANGE | 14 | France | — | cloud.orange-business.com |
| OrangeHost LLC | 4335 | United States | — | orangehost.com |
| OregonEU.com LLC | 1226 | United States | — | networksolutions.com |
| OregonURLs.com LLC | 1227 | United States | — | networksolutions.com |
| Osir, Inc. | 4332 | United States | — | osir.com |
| Ourdomains Limited | 1654 | Hong Kong | — | ourdomains.com |
| OVH sas | 433 | France | — | ovh.com |
| Own Identity, Inc. | 985 | Italy | — | ownidentity.com |
| OwnRegistrar, Inc. | 1250 | United States | — | ownregistrar.com |