Subnet Mask Table

This Subnet Mask Table shows the IP address range for a Subnet Mask. The first and last IPs are broadcast addresses and cannot be used on your router or computer. The first line of each Subnet Mask shows the range of usable IP addresses; this is the maximiun number of devices you can use with the corresponding Subnet Mask.

A Subnet Mask does not works like an IP address, nor does it exist independently from an IP address. Subnet Masks accompany an IP address and the two values work together. Applying the subnet mask to an IP address splits the address into two parts, a "Class B Network" or "Extended network address" and a host address (device).