If we include four bits from the host part to the network part, the subnet mask is changed to 255.255.240.0.
The four bits added to network part can have sixteen possible values in third octet and that are 0000, 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1000, 1001, 1010, 1011, 1100, 1101, 1110, 1111.
| SN No |
Description |
Binaries
|
Decimal |
| 1 |
Network Address |
10101100.00010000.00000000.00000000 |
172.16.0.0 |
| First IP Address |
10101100.00010000.00000000.00000001 |
172.16.0.1 |
| Last IP Address |
10101100.00010000.00001111.11111110 |
172.16.15.254 |
| Broadcast Address |
10101100.00010000.00001111.11111111 |
172.16.15.255 |
| 2 |
Network Address |
10101100.00010000.00010000.00000000 |
172.16.16.0 |
| First IP Address |
10101100.00010000.00010000.00000001 |
172.16.16.1 |
| Last IP Address |
10101100.00010000.00011111.11111110 |
172.16.31.254 |
| Broadcast Address |
10101100.00010000.00011111.11111111 |
172.16.31.255 |
| 3 |
Network Address |
10101100.00010000.00100000.00000000 |
172.16.32.0 |
| First IP Address |
10101100.00010000.00100000.00000001 |
172.16.32.01 |
| Last IP Address |
10101100.00010000.00101111.11111110 |
172.16.47.254 |
| Broadcast Address |
10101100.00010000.00101111.11111111 |
172.16.47.255 |
| 4 |
Network Address |
10101100.00010000.00110000.00000000 |
172.16.48.0 |
| First IP Address |
10101100.00010000.00110000.00000001 |
172.16.48.1 |
| Last IP Address |
10101100.00010000.00111111.11111110 |
172.16.63.254 |
| Broadcast Address |
10101100.00010000.00111111.11111111 |
172.16.63.255 |
| 5 |
Network Address |
10101100.00010000.01000000.00000000 |
172.16.64.0 |
| First IP Address |
10101100.00010000.01000000.00000001 |
172.16.64.1 |
| Last IP Address |
10101100.00010000.01001111.11111110 |
172.16.79.254 |
| Broadcast Address |
10101100.00010000.01001111.11111110 |
172.16.79.255 |
| 6 |
Network Address |
10101100.00010000.01010000.00000000 |
172.16.80.0 |
| First IP Address |
10101100.00010000.01010000.00000001 |
172.16.80.1 |
| Last IP Address |
10101100.00010000.01011111.11111110 |
172.16.95.254 |
| Broadcast Address |
10101100.00010000.01011111.11111111 |
172.16.95.255 |
| 7 |
Network Address |
10101100.00010000.01100000.00000000 |
172.16.96.0 |
| First IP Address |
10101100.00010000.01100000.00000001 |
172.16.96.1 |
| Last IP Address |
10101100.00010000.01101111.11111110 |
172.16.111.254 |
| Broadcast Address |
10101100.00010000.01101111.11111110 |
172.16.111.255 |
| 8 |
Network Address |
10101100.00010000.01110000.00000000 |
172.16.112.0 |
| First IP Address |
10101100.00010000.01110000.00000001 |
172.16.112.1 |
| Last IP Address |
10101100.00010000.01111111.11111110 |
172.16.127.254 |
| Broadcast Address |
10101100.00010000.01111111.11111111 |
172.16.127.255 |
| 9 |
Network Address |
10101100.00010000.10000000.00000000 |
172.16.128.0 |
| First IP Address |
10101100.00010000.10000000.00000001 |
172.16.128.1 |
| Last IP Address |
10101100.00010000.10001111.11111110 |
172.16.143.254 |
| Broadcast Address |
10101100.00010000.10001111.11111111 |
172.16.143.255 |
| 10 |
Network Address |
10101100.00010000.10010000.00000000 |
172.16.144.0 |
| First IP Address |
10101100.00010000.10010000.00000001 |
172.16.144.1 |
| Last IP Address |
10101100.00010000.10011111.11111110 |
172.16.159.254 |
| Broadcast Address |
10101100.00010000.10011111.11111111 |
172.16.159.255 |
| 11 |
Network Address |
10101100.00010000.10100000.00000000 |
172.16.160.0 |
| First IP Address |
10101100.00010000.10100000.00000001 |
172.16.160.1 |
| Last IP Address |
10101100.00010000.10101111.11111110 |
172.16.175.254 |
| Broadcast Address |
10101100.00010000.10101111.11111111 |
172.16.175.255 |
| 12 |
Network Address |
10101100.00010000.10110000.00000000 |
172.16.176.0 |
| First IP Address |
10101100.00010000.10110000.00000001 |
172.16.176.1 |
| Last IP Address |
10101100.00010000.10111111.11111110 |
172.16.191.254 |
| Broadcast Address |
10101100.00010000.10111111.11111111 |
172.16.191.255 |
| 13 |
Network Address |
10101100.00010000.11000000.00000000 |
172.16.192.0 |
| First IP Address |
10101100.00010000.11000000.00000001 |
172.16.192.1 |
| Last IP Address |
10101100.00010000.11001111.11111110 |
172.16.207.254 |
| Broadcast Address |
10101100.00010000.11001111.11111111 |
172.16.207.255 |
| 14 |
Network Address |
10101100.00010000.11010000.00000000 |
172.16.208.0 |
| First IP Address |
10101100.00010000.11010000.00000001 |
172.16.208.1 |
| Last IP Address |
10101100.00010000.11011111.11111110 |
172.16.223.254 |
| Broadcast Address |
10101100.00010000.11011111.11111111 |
172.16.223.255 |
| 15 |
Network Address |
10101100.00010000.11100000.00000000 |
172.16.224.0 |
| First IP Address |
10101100.00010000.11100000.00000001 |
172.16.224.1 |
| Last IP Address |
10101100.00010000.11101111.11111110 |
172.16.239.254 |
| Broadcast Address |
10101100.00010000.11101111.11111111 |
172.16.239.255 |
| 16 |
Network Address |
10101100.00010000.11110000.00000000 |
172.16.240.0 |
| First IP Address |
10101100.00010000.11110000.00000001 |
172.16.240.1 |
| Last IP Address |
10101100.00010000.11111111.11111110 |
172.16.255.254 |
| Broadcast Address |
10101100.00010000.11111111.11111111 |
172.16.255.255 |
The network 172.16.0.0 is divided into sixteen networks, each network has 4096 total IP addresses and 4094 usable IP addresses (two IP addresses are used in each subnet to represent the netwok id and the broadcast id). The subnet mask is 255.255.240.0.
Class B Subnetting can be summerized as below.
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