Blog 01 – Subnetting

Subnetting allows you to partition a physical network into multiple smaller sub-networks (subnets). With this, it is possible to increase or decrease the number of IP addresses available on a single net address.

The basic structure for an IPv4 binary address with a 24 bit subnet mask is:
nnnnnnnn.nnnnnnnn.nnnnnnnn.hhhhhhhh
n = network part of the address
h = host part of the address
s = subnet part of the address
If we were to switch the first ‘h’ for an ‘s’ we would be able to use that bit as a network address. This would give us more net addresses to use but would reduce the number of IP addresses available for each address.

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