In this diagram, you can see the subnet mask with
Prefix LengthNo. of IP matchedNo. of Addressable IP
/32 |
| 1 |
| - |
|
|
| ||
/31 |
| 2 |
| - |
|
|
|
|
|
|
|
| ||
/30 |
| 4 |
| 2 |
|
|
|
|
|
|
|
| ||
/29 |
| 8 |
| 6 |
|
|
| ||
/28 |
| 16 |
| 14 |
|
|
| ||
/27 |
| 32 |
| 30 |
|
|
|
|
|
|
|
| ||
/26 |
| 64 |
| 62 |
|
|
|
|
|
|
|
| ||
/25 |
| 128 |
| 126 |
|
|
| ||
/24 |
| 256 |
| 254 |
|
|
|
|
|
|
|
| ||
/23 |
| 512 |
| 510 |
|
|
|
|
|
|
|
| ||
/22 |
| 1024 |
| 1022 |
|
|
|
|
|
|
|
| ||
/21 |
| 2048 |
| 2046 |
|
|
| ||
/20 |
| 4096 |
| 4094 |
|
|
| ||
/19 |
| 8192 |
| 8190 |
|
|
|
|
|
|
|
| ||
/18 |
| 16384 |
| 16382 |
|
|
|
|
|
|
|
| ||
/17 |
| 32768 |
| 32766 |
|
|
| ||
/16 |
| 65536 |
| 65534 |
|
|
|
|
|
Table
According to the scheme above, a subnet mask 255.255.255.0 will partition a network with the class C. It means there will have a maximum of 254 effective nodes existed in this
With the subnet mask, a bigger network can be cut into small pieces of network. If we want to have more than two independent networks in a network, a partition to the network must be performed. In this case, subnet mask must be applied.
29