Looking for domain extensions that start with the letter 'O'. Search through the list and find information regarding TLDs that begin with 'O', simply click on the TLD to receive more information.
| TLD | Type | Sponsor | Registered |
|---|---|---|---|
| .obi | gTLD | OBI Group Holding SE & Co. KGaA | 1 |
| .observer | gTLD | Top Level Spectrum, Inc. | 926 |
| .off | gTLD | Johnson Shareholdings, Inc. | 1 |
| .office | gTLD | Microsoft Corporation | 2 |
| .okinawa | gTLD | BRregistry, Inc. | 3,564 |
| .olayan | gTLD | Crescent Holding GmbH | 2 |
| .olayangroup | gTLD | Crescent Holding GmbH | 2 |
| .oldnavy | gTLD | The Gap, Inc. | 1 |
| .ollo | gTLD | Dish DBS Corporation | 1 |
| .om | ccTLD | Telecommunications Regulatory Authority (TRA) | 3,290 |
| .omega | gTLD | The Swatch Group Ltd | 3 |
| .one | gTLD | One.com A/S | 66,788 |
| .ong | gTLD | Public Interest Registry | 3,114 |
| .onl | gTLD | I-REGISTRY Ltd., Niederlassung Deutschland | 3,936 |
| .online | gTLD | DotOnline Inc. | 785,704 |
| .onyourside | gTLD | Nationwide Mutual Insurance Company | 1 |
| .ooo | gTLD | INFIBEAM INCORPORATION LIMITED | 220,066 |
| .open | gTLD | American Express Travel Related Services Company, Inc. | 1 |
| .oracle | gTLD | Oracle Corporation | 3 |
| .orange | gTLD | Orange Brand Services Limited | 7 |
| .org | gTLD | Public Interest Registry (PIR) | 10,400,651 |
| .organic | gTLD | Afilias plc | 3,274 |
| .orientexpress | gTLD | Orient Express | 1 |
| .origins | gTLD | The Estée Lauder Companies Inc. | 1 |
| .osaka | gTLD | Interlink Co., Ltd. | 616 |
| .otsuka | gTLD | Otsuka Holdings Co., Ltd. | 16 |
| .ott | gTLD | Dish DBS Corporation | 1 |
| .ovh | gTLD | OVH SAS | 53,501 |
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