The zone (shown in bold) is the suffix coming after the main body of the domain name.
.ac - An academic site, usually outside the US and often followed by a country code, as in 'ac.uk'.
.arts - Organization relating to, well, The Arts.
.au - Australia.
.ca - Canada.
.co - Company, usually outside the US and often followed by a country code, as in 'co.uk'.
.com - The most common zone on the net, it usually refers to a commercial address. It is largely American.
.de - German.
.edu - An educational institution, usually American.
.firm - A business of some sort. Used much less frequently than '.com'.
.fr - France.
.gov - Some branch of the government, often American.
.info - An organization specializing in sharing information.
.jp - Japan.
.mil - A military site.
.net - An administrative host, the zone in which many ISPs are located.
.nl - Netherlands.
.no - Norway.
.nom - Personal address.
.org - A non-profit organization.
.rec - An organization specializing in leisure, recreation and outdoorsy stuff.
.se - Sweden.
.store - A company offering goods.
.tw - Taiwan.
.uk - United Kingdom.
.web - An organization specializing in WWW stuff.
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