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Portions of a TCP/IP network used to increase the bandwidth on the network by subdividing the network into portions or segments. All IP addresses within a subnet use the same first three sets of numbers (such as 192.168.1 in and indicating they are on the same network. See also subnet mask.

A portion of a storage network typically consisting of all machines in one locale, in one building, or on the same local area network (LAN). Internet Request for Comments 950 provides the standard procedure for creating and identifying subnets.