Domain zone

Register a .io domain

Short, technical and easy to remember, .io has become one of the most recognisable endings for software products and startups.

About .io

.io is the country code top-level domain of the British Indian Ocean Territory. Registration was never limited to residents, and from the late 2000s software companies started picking it because “I/O” is the familiar abbreviation for input/output in computing.

Today the zone is used far more by tech teams than by anything connected with the territory. Developer tools, APIs, SaaS dashboards and open-source projects often run on .io, and a whole genre of multiplayer browser games became known as “.io games” after early hits used the ending. Google treats .io as a generic domain for search purposes, so a site on it is not tied to one country.

Names that work on .io are typically short product names, invented words or a verb describing what the tool does. Because technical audiences already recognise the ending, there is little need to explain it.

Good for

Startups and SaaS products

A short .io name is often still available when the matching .com is long gone, and it looks at home on a product launch page.

Developer tools and APIs

Documentation sites, API endpoints and status pages on .io fit what engineers expect from a technical product.

Browser games

Players already associate the ending with quick multiplayer games played straight in the browser.

Registering a .io domain

Open to individuals and companies anywhere; you do not need any connection with the British Indian Ocean Territory.
Google classifies .io as a generic domain, so it is not used to target search results at one country.
Standard name rules apply: Latin letters, digits and hyphens, with the hyphen not allowed at either end.

With every domain at Rivervo

DNS management in the Rivervo panel
WHOIS privacy free where the zone allows it
Point it at Rivervo hosting or any other server
Renewal reminders before it expires

Questions about .io

Engineers read “IO” as input/output, the ending is only two letters long, and many good short names were still free when .com options were exhausted. Those three reasons made it a habit in the startup world.

No. Google lists .io among country codes that it treats as generic, so the site can rank for an international audience. You can still set language and regional signals on the site itself.

It can be, but outside the tech world fewer people recognise it, and some may type .com instead. For a local shop or service, a better-known generic or national ending is usually easier for customers.