'''.co''' is one of the country code top-level domain names ([[ccTLD]]) in the root zone of the internet Domain Name System ([[DNS]]), which was assigned to the country of Colombia under ISO-3166-1 code. [[.CO Internet SAS]], a business partnership between [[Arcelandia S.A.]] and [[Neustar]] is responsible in managing all the operations and services of the .co ccTLD.<ref>[http://www.iana.org/reports/2009/co-report-24nov2009.html Redelegation of the .CO domain representing Colombia to .CO Internet SAS]</ref>