subnet - A subnet is a way to refer to a logical block of IP addresses. For example, the Network Development subnet contains addresses from 128.2.6.0 through 128.2.6.255. Ultimately, the subnet determines what IP address the machine receives. What subnet a particular machine should be in depends on several factors, such as the physical location of the machine, the physical connection of the machine, and sometimes even the department affiliation of the machine, or even the specific purpose of the machine, in the case of servers and network hardware. When registering a machine, or changing its subnet, the system allows you to choose the new subnet directly, or to receive help in determining the subnet based on the Building or Network the machine is connected to.