.io domain search
The developer and startup favourite
.io became the default extension for developer tools, APIs and technical startups because it reads as input/output and short names stayed available long after .com ran dry.
- Live registry data
- 300+ extensions checked
- Free, no sign-up
We check .io against the registry and show every other extension for the same name.
Good .io names get snapped up fast.
Type
Country-code (British Indian Ocean Territory)
Restrictions
None
Common use
Startups, dev tools, documentation sites
Price
Above average for a generic extension
Who .io suits
- Developer tools and APIs
- SaaS and technical products
- Open-source projects
How to register .io
- 1Search your name to confirm the .io is free.
- 2Compare the same name across related extensions.
- 3Register at the checkout link — your search carries over.
Is your .io still free?
One search checks .io plus hundreds of alternatives, live.
Live registry data across 300+ extensions. Free, no signup.
.io questions, answered
Is .io good for SEO?
Search engines treat widely-used country extensions like .io as generic in practice, so the extension itself is not the ranking factor — content, links and page experience are.
Are .io domains still available?
Short single words are mostly gone, but two-word and invented names are widely available. Search a name here to see live status.