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172.16.0.0 is really a B Class address with 16 network bits and 16 host bits, i.e. Network Address 172.16.0.0 has 255.5255.0.0 as Subnet mask in Classful Addressing. To create 32 (25) subnets we will use first five bits for Network part and will leave 3 bits as Host bits in third octet. Now Addressing will be:

Network Address: 172.16.0.0\21 or 172.16.0.0 Subnet Mask: 255.255.248.0

First two networks will be : (1) 172.16.0.0-172.16.7.255\21, (2) 172.16.8.0-172.16.15.255\21 and last two networks will be (1) 172.16.240.0-172.16.247.255\21, (2) 172.16.248.0-172.16.255.255\21.

(Note to use Zero subnet - remember to use IP SUBNET ZERO command.)

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12y ago

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