Nigel’s Rule

In the address, all zeros under the zeros in the subnet mask equals the Network address

In the address, all ones under the zeros in the subnet mask equals the Broadcast address

In the address, any combination of ones and zeros under the zeros the subnet mask equals a

Host address

E.G

255 . 255 . 255 . 224

1 1 1 1 1 1 1 1 . 1 1 1 1 1 1 1 1 . 1 1 1 1 1 1 1 1 . 1 1 1 0 0 0 0 0

10 . 10 . 10 . 128 Network

0 0 0 0 1 0 1 0 . 0 0 0 0 1 0 1 0 . 0 0 0 0 1 0 1 0 . 1 0 0 0 0 0 0 0

10 . 10 . 10 . 159 Broadcast

0 0 0 0 1 0 1 0 . 0 0 0 0 1 0 1 0 . 0 0 0 0 1 0 1 0 . 1 0 0 1 1 1 1 1

10 . 10 . 10 . 136 Host

0 0 0 0 1 0 1 0 . 0 0 0 0 1 0 1 0 . 0 0 0 0 1 0 1 0 . 1 0 0 0 1 0 0 0