What are .io Games?

Why Do .io Games use the .io Extension?

Agar.io was the first game. The domain Agar.io was suggested by a user on 4chan, simply because all other related names like cell.com and cell.io were taken. At the time of naming the .io top level domain extension was relatively new and the price was very high. So many dictionary term domains were still available. .io is the Internet domain ID for the British Indian Ocean Territory. Since few few domains are registered, and .io seemed unique enough, it was readily used and accepted.

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Agar.io

Diep.io

Video Library.

.io games

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