A Subnet Mask is a numerical value that describes a computer or device’s how to divide an IP address into two parts: the network portion and the host portion. The network element identifies the network to which the computer belongs and the host part identifies the unique computer on that network. An IP address is made up of four digits separated by dots, for example, 255.255.255.0 and each number can be between 0 and 255, with higher values using more bits for the network and lesser values for the host. A subnet mask allows devices on the same ...