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(4) The more detail is written this section.
The subnet masks are divided two parts, the network number and the host number.
AA) The all place of Network Number have to be “1”.
You may think like these.
0.0.0.0 is an almighty one. that is wrong all 0(zero).
1000 0000 . 0000 0000 . 0000 0000 . 0000 0000 = 128 . 0 . 0 . 0 is strong one.
If the number of HOST increases, looking for HOST will take time.
The minimum quantities of host are better for network (speed).
BB) The all place of HOST Number have to be “0”.
For example, the subnet mask is 1111 1111 . 11111 1111 . 1111 1110 . 0000 0000
It is decided that the Host Number do not use all “0(zero)” and all “1”.
So the host (IP address) in this same subnet musk group are
from 0 . 0000 0001 to 1 . 1111 1110 = 510 kinds
1111 1111 . 11111 1111 . 1111 1110 . 0000 0000
Network Number Host Number
2-15