Questions about the IP protocol and IP addresses. For Linux ip utility related questions, use iproute tag instead.
IP (Internet Protocol) is the network protocol used over the Internet to route packets from one machine to another. Machines on the Internet are identified by an IP address. There are two versions of IP: the older and ubiquitous ipv4, and the newer ipv6.
Use this tag for questions about the IP protocol and its support on unix systems. Related tags include: