So what was next – Classess Addressing & the Subnet Mask

128

15

4

0

Network Identification

Host Identification

255

255

255

0

The Subnet Mask identifies the Network Portion of the address with the remainder being the host portion

So this was the solution, and we still use it

1000 0000 0000 1111 0000 0100 0000 0000

1111 1111 1111 1111 1111 1111 0000 0000

Here it is in Binary – Any Assembly Programmers in the room?