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In this diagram, you can see the subnet mask with 25-bit long,
255.255.255.128, contains 126 members in the sub-netted network. Another is that
the length of network prefix equals the number of the bit with 1s in that subnet mask.
With this, you can easily count the number of IP addresses matched. The following
table shows the result.
Prefix Length No. of IP matched No. of Addressable IP
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 sub-netted network and is considered a physical network in an
autonomous network. So it owns a network IP address which may looks like
168.1.2.0.
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 worknet, a
partition to the network must be performed. In this case, subnet mask must be
applied.
/32
1
/31
2
/30
4
/29
8
/28
16
/27
32
/26
64
/25
128
/24
256
/23
512
/22
1024
/21
2048
/20
4096
/19
8192
/18
16384
/17
32768
/16
65536
Table 2-4
22
-
-
2
6
14
30
62
126
254
510
1022
2046
4094
8190
16382
32766
65534
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