IPv4 Subnetting Class B

IPv4 Subnetting Class B

Example 172.16.0.0/16 (Class B)

172.16.0.0 10101100.00010000.00000000.00000000

255.255.0.0 = 11111111.11111111.00000000.00000000



2 possible ways to do this:

A. Number of networks

B. Number of hosts per network



2 Networks

Network ID & Subnet Mask

172.16.0.0 = 10101100.00010000.01111111.11111110

255.255.128.0 = 11111111.11111111.10000000.00000000 /17

Range: 172.16.0.1 - 172.16.127.254

Broadcast ID: 172.16.127.255



Network ID & Subnet Mask

172.16.128.0 = 10101100.00010000.11111111.11111111

255.255.128.0 = 11111111.11111111.10000000.00000000 /17

Range: 172.16.128.1 - 172.16.255.254

Broadcast ID: 172.16.255.255



# of host per network (Watch the number of networks we can create)

Network ID & Subnet Mask

172.16.0.0 = 10101100.00010000.00000000.00111111

255.255.255.192 = 11111111.11111111.11111111.11000000 /26

Range: 172.16.0.1 - 172.16.0.62

Broadcast ID: 172.16.0.63



Network ID & Subnet Mask

172.16.0.0 = 10101100.00010000.00000000.00000000

255.255.0.0 = 11111111.11111111.00000000.00000000