internet terminology extensions

Extension	Meaning
.com	commercial organization (in Internet addresses)
.gov	government agency (in Internet addresses)
.net	network provider (in Internet addresses)
.sch	In the domain name system (DNS), .sch is a second-level domain used by several countries, including Iran (.ir), Saudi Arabia (.sa), and theUnited Kingdom (.uk), as a subdomain to represent primary and secondary schools. In the United Kingdom, these are linked with area names, such that schools have a domain name of the form www.<schoolname>.<areaname>.sch.uk. It is up to the individual countries whether to use this classification system, and whether a given organization qualifies as a school.
.ac	It  is the Internet country code top-level domain (ccTLD) for Ascension Island. It is administered by NIC.AC, a subsidiary of the Internet Computer Bureau based in the United Kingdom.
.co	It is the Internet country code top-level domain (ccTLD) assigned to Colombia
.ed
.org	The domain name org is a generic top-level domain (gTLD)