What is a subnet?

A sub network (subnet) is a part of an organisation's network. A subnet may represent all the machines at one geographic location, in one building, or on the same local area network (LAN). Dividing a network into subnets allows the network to be connected to the Internet with a single shared network address. Without subnets, a network might use multiple connections to the Internet, one for each physically separate sub network. When referring to IPv6 addressing schemes, subnets are used to describe the amount of addresses contained within IPv6 slash notation.