.io
Domain Information
Organisation
Administrative Contact
Technical Contact
Reserved Second-Level Domains
About .io
The .io domain extension has become one of the most popular choices for tech startups, SaaS products, developer tools, and gaming companies. It is the country code TLD (ccTLD) for the British Indian Ocean Territory, but its appeal comes from its association with "input/output" (I/O) in computer science.
History of .io
.io is the country code TLD assigned to the British Indian Ocean Territory. While originally intended for that territory, it became widely adopted by the tech community in the 2010s due to its I/O association. It is now managed by the Internet Computer Bureau on behalf of the territory's administrator.
Who Uses .io?
.io domains are popular with:
- Tech startups seeking a modern, tech-forward identity
- Developer tools (API services, CLI tools, IDEs)
- SaaS platforms targeting technical audiences
- Gaming companies (Agar.io, Slither.io)
- Open source projects
Registration Requirements
No geographic restrictions for .io. Registration costs approximately $30–$60/year, higher than .com due to its premium positioning. Available through most major registrars.