.co is the country code top-level domain name (ccTLD) for Colombia. A government supported entity was created between Arcelandia S.A. and Neustar, .CO Internet SAS, which manages .co as an open ccTLD. Domain name registration is open to all entities worldwide, and it is marketed as a great alternative to the .com domain space.
.CO domain extension ranks #21 among all domain extensions, and #13 among all country-code extensions (ccTLDs). Currently, there are 2.1 Million registered .co domain names. Neustar is the registry of .co extension.
The oldest (still exists) .co domain name is uniandes.edu.co, and it was registered on 01 January 1996.
The most popular .co domain name is t.co. Its worldwide rank is 220.
.CO domains are most popular in United States. Panama and Colombia are the other countries that have most .co domain registrations.