IP number Each network device has been given a separate location from every other device. On the Internet Protocol (IP) computer network, these devices talk to one another. An IP address is necessary for both communication and logging into a network device, like a router. the IP address Each network device has its own location apart from the other devices. These devices communicate with one another over an IP (Internet Protocol) computer network. Both communication and login into a network equipment, such as a router, require an IP address.