.io domain name checker
.io is the country-code TLD of the British Indian Ocean Territory. Developers adopted it because it reads as "input/output", and it became shorthand for a tech startup. Registration is open to anyone.
Type the full domain, like yourname.io. You’ll also see the same name across 100+ other TLDs.
.io at a glance
- Type
- Country-code TLD (ccTLD) of British Indian Ocean Territory
- Best for
- Developer tools, SaaS
- How we check
- Registry RDAP where the registry publishes it, DNS otherwise. Each result says which one answered.
Worth knowing
- The UK's 2024 agreement to transfer sovereignty of the Chagos Islands to Mauritius raised questions about .io's long-term future. Nothing has changed for registrants so far, but it's worth watching for a long-lived brand.
- Operated by Identity Digital, which also runs .sh and .ac.
- Usually priced above .com. Check renewal prices before you commit.