.ca is the country code top level domain for Canada.
.co.uk domain name
.co.uk is the country code second level domain extension for the United Kingdom. The central registry for the .co.uk domain name is Nominet UK.
.co.uk domain names became available for registration in 1985.
.co.za domain name
.co.za is the most popular country code second level domain extension in South Africa. The central registry for the .co.za domain name is ZADNA. Anyone can register a .co.za domain name.
.com domain name.
.com is a top-level domain [TLD] name extension that first became available in 1985