.io
The .io domain is technically the country code TLD for the British Indian Ocean Territory, but it has been completely transformed by the tech industry. Its popularity exploded in the 2010s because ‘I/O’ (input/output) resonates deeply with developers and engineers. Startups, SaaS companies, and open-source projects adopted .io en masse — GitHub Pages uses github.io, and countless Y Combinator startups chose .io over .com. The extension commands premium prices, often $30-50/year for standard registrations. Despite ongoing geopolitical concerns about the British Indian Ocean Territory’s sovereignty (the UK agreed to cede it to Mauritius), .io shows no signs of declining in popularity among the tech community.
── Quick Facts ──
Extension
.io
Type
ccTLD
Country
British Indian Ocean Territory
Region
Asia
Categories
Top 20, Country Codes, Technology
── Check .io Availability ──
Enter a name above to check .io availability...
── API Example ──
# Check availability with RobotDomainSearch API $ curl "https://api.robotdomainsearch.com/v1/check?name=example&tlds=io"