Subnet MaskingIP Address

154.37.55.89

Subnet Mask

255.255.0.0

154 37 55 89

Use any valueup to 255

Do not usevalues here

Subnet thenode resides on

154 37 55 8910011010

Apply the Mask to the AddressA closer look…

255 255 0 0

255.255.240.0

00100101 00110111 01011001 255 255 240 011111111 11111111 11110000 000000000000

Convert everything to binary…Apply the mask to the AddressMask out all the “0”s

0111

These bits represent thenetwork and subnet portion

of the IP address