.io domain: Tech favorite from the British Indian Ocean Territory

Registered domains Updated 10 Jun 2026 · Source: NIC.IO public data 2026

1,500,000

Domains

#35

Worldwide rank

0.35%

Of TLD census

425M

Census universe

.io holds 1,500,000 registered domain names. That makes it the 35th largest TLD by domain count and 0.35% of the global TLD census of 424,986,374 domains we track. By any reasonable measure that is a mid-tier TLD.

Either side of .io on the league table: .bond sits one place above with 1,531,826 domains, and .click sits one place below with 1,497,215.

Counts are the most recent public figure available from the registry or from ntldstats.com, refreshed weekly. Citation policy.

About .io

The .io domain is the country code for the British Indian Ocean Territory, managed by Internet Computer Bureau Limited. Despite its official status as a ccTLD, .io has become one of the most popular generic-style domains on the web. Startups, tech companies, and developers use it for short brandable names, often as a cute nod to input/output in computing. There are no strict eligibility restrictions, which helped it find a global audience. Registration is open to anyone through accredited registrars. The administrative contact is routed through the territory's telecom provider, Sure (Diego Garcia) Limited. The registry itself operates out of the UK. The domain was first delegated in 1997, long before its modern tech boom.

Eligibility & restrictions

No local presence or eligibility restrictions. Open to all registrants.

Technical record Source: IANA

ASCII TLD: .io
Display TLD: .io
Type: COUNTRY-CODE
Sponsor: Internet Computer Bureau Limited

io (.io)

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