.CO is a young commercial domain zone that became an alternative to .COM.
At first it was a territorial domain of Columbia. But in 2010 .CO became available for public registration and has gained huge popularity among startups.
IDN support: no.
Domain registration processing time: a registration of .co domain takes several minutes after the payment has been received.
Restrictions on registration and using: none.
Minimal registration period: 1 year
Maximum registration period: 10 years
Minimal domain length, not including ".co": 3 characters.
Maximum domain length, not including ".co": 63 characters.