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1. In an IPX network, a number that uniquely identifies a network cable segment; usually referred to as the IPX external network number.2. In a TCP/IP network, the number of the network. The network number can be specified with or without trailing zeros. For example, the addresses 130.57 and 188.8.131.52 denote the same IP network.3. In an AppleTalk network, a decimal integer between 1 and 65,279 assigned to each nonextended network supporting AppleTalk.