====== Internet Service Provider (ISP) ======

An //ISP// is either an institution or a paid-for service provider that literally gives its clients access to the Internet. An ISP will typically buy a block of IP addresses from an higher level ISP (e.g. for UK academia that is JANET which runs the //ac.uk// domain) which it can allocate to its customers and name as it wishes. ISPs are usually associated with a [[domain name]], e.g. //swan.ac.uk//, and to be good citizens on the Internet, must provide the [[dns|domain name service]] (DNS) and [[authoritive_name|authoritative naming]] for the [[fqdm|fully qualified domain names]] (FQDN) of all the hosts ([[IP_address|IP addresses]]) that the ISP has ownership of. 

In modern systems, ISPs allocated their supply of IP addresses to hosts on-demand using a protocol known as [[DHCP]].
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