The definition of a long ip is a unique identifier assigned to a device that is connected to a computer network. It is a numerical label that is used to identify and locate a device on a network. Long ip addresses are typically 32-bit or 128-bit numbers that are used to identify the device and its location on the network. The long ip address is composed of four sets of numbers, each separated by a period. The first set of numbers is the network number, the second set is the subnet number, the third set is the host number, and the fourth set is the device number. The long ip address is used to route data packets to the correct destination on the network. It is important to note that long ip addresses are not static and can change over time.