От: регистрация на домейн.CO
.co is the country code top-level domain assigned to the Republic of Colombia. It is administered by .CO Internet S.A.S.,[2] a strategic venture formed between Arcelandia S.A. and Neustar, Inc. Arcelandia is an entity with interests in a variety of Internet-related businesses; and Neustar is a provider of global registry and managed DNS services for top-level domains.[3]
As of July 20, 2010, any company, organization, or entrepreneur can use a .CO domain for their online branding needs. Some examples include Twitter (t.co), AngelList (Angel.co), ENTER (Enter.co), and e-commerce giant Overstock (O.co).
en.wikipedia.org/wiki/.co#Second-level_domain_names