Answer / niraj mishra

Hello friends,
When you are talking about /20, that means the host derived
from 3rd octet, the subnet in binary will as
11111111.11111111.11110000.00000000
so in third octet 1 start from 16 position so block size
will 16, now if we have given the ip 173.16.20.0/20, so it
means that it belongs to the network 173.16.16.0 and
possible ip address will as 172.16.16.1 to 172.16.16.30,
because 172.16.16.31 will broadcast address.

In other word we can say that we just have to check block
size in appropriate octet, which will the proper network
address..... please reply am i right

Answer / satyendra kumar

we see the first octet of the IP.which shows the network id .

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