Registrars: U
16 registrars
| Registrar | IANA ID | Country | Registrar family | Website |
|---|---|---|---|---|
| Ubilibet S.L. | 3802 | Spain | — | ubilibet.com |
| Udamain.com LLC | 945 | United States | — | networksolutions.com |
| UdomainName.com LLC | 931 | United States | — | networksolutions.com |
| UK-2 Limited | 84 | United Kingdom | — | uk2group.com |
| Ultahost, Inc. | 4331 | United States | — | ultahost.com |
| Ultra Registrar, LLC | 1108 | India | — | ultraregistrar.com |
| UM Domains Pte. Ltd. | 4561 | Singapore | — | umdomain.com |
| Unidata S.p.A. | 1444 | Italy | — | twt.it |
| Unified Servers, LLC | 1106 | India | — | unifiedservers.com |
| United-domains GmbH | 1408 | Germany | — | united-domains.de |
| Unitedkingdomdomains, LLC | 873 | United States | — | unitedkingdomdomains.com |
| Universal Registration Services, Inc. dba NewDentity.com | 448 | United States | — | newdentity.com |
| Unpower, LLC | 1105 | India | — | unpower.com |
| Unstoppable Domains Inc. | 4326 | United States | — | unstoppabledomains.com |
| Upperlink Limited | 1749 | Nigeria | — | domains.upperlink.ng |
| URL Solutions, Inc. | 1449 | Panama | — | pananames.com |