.co (second-level domain) .co (second-level domain) In a number of countries, .co is used as a second-level domain to mean "commercial" and domain registrants register second-level domains of the form .co.xx, where xx is the country code top level domain (e.g., .co.uk in the U.K. and .co.jp in Japan). Some of the countries using .co as a second-level domain include: Barbados (.bb), Cook Islands (.ck), Costa Rica (.cr), India (.in), Indonesia (.id), Israel (.il), Japan (.jp), New Zealand (.nz), South Africa (.za), South Korea (.kr), Thailand (.th) and the United Kingdom (.uk). .co is also a country top-level domain corresponding to Colombia. Its
Unsponsored top-level domain Unsponsored top-level domain An unsponsored top-level domain (uTLD) is one of the categories of top-level domains (TLDs) maintained by the Internet Assigned Numbers Authority (IANA) for use in the Domain Name System of the Internet. IANA currently distinguishes 3 groups of top-level domains: country-code top-level domains (ccTLD), generic top-level domains (gTLD) and infrastructure top-level domain. Unsponsored TLD is a specialized top-level domain that has no sponsor, in opposition of sTLD (sponsored), that has a sponsor representing a specific community served by the domain. Generally speaking, uTLD is a TLD without "owner", where ICANN has an important governance role. It is