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All hosts on the Internet, or any TCP/IP network for that matter, have an assigned 32-bit IP address. Most hosts have a name, as well, since host names are easier to remember than host addresses. The Domain Name System (DNS) is the distributed database that contains the names and addresses of all reachable hosts on a TCP/IP subnet, including the Internet.

Most, but not all, Internet service providers (ISPs) will set up and maintain the DNS information for their customers.