.io domains are one of the fastest growing territorial extensions in the last few years, this is due to the fact that its acronym "io" means "input/output", a term widely used in the technology industry.
But the .io domains actually belong to the British Indian Ocean Territory and were launched in early 1997. Interestingly, the first .io domain was levi.io, registered by Levi Strauss & Co. a well-known American clothing brand.
Besides being popular for the technological term, .io domains have also been registered in many occasions because it is easy to create domain hacks with it, forming words like card.io. In recent years a lot of new services and video games have used this extension for their main domain.
The .io domains are managed by Afilias, which also offers other extensions such as .info, .pro or .bio, among others.























