Linked from
The 17 pages that link to IP address, each with the reason it gives.
Internet ProtocolRelated: Source and destination addresses identify the endpoints of an IP datagram.
Domain Name SystemRelated: Address records let DNS connect domain names with network destinations.
Transmission Control ProtocolRelated: TCP connections use the IP addresses of their endpoint hosts.
Client–server modelRelated: Addressing lets clients direct packets toward server endpoints.
Architecture (networks)Related: Addressing lets the architecture identify destinations for data.