Provider-Assigned IPv4 Addresses
ISPs have collections of publicly routable IPv4 addresses that they can distribute to their customers, thus allowing devices in the customer networks to communicate over the Internet. The IPv4 address assignments to customers could be either static assignments or dynamic assignments.
Static assignments might be useful to customers that have servers needing to be accessed from the Internet. For example, a company might have a web server as part of its network. If there is a static IP address assignment for that server, a Domain Name System (DNS) name could be associated with that IP address, allowing users on the Internet to access the web server by specifying the DNS name of the server (as opposed to its IP address) ...
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