Subnetting allows you to create multiple logical networks
that exist within
a single Class A, B, or C network. If you don't subnet,
you will only be
able to use one network from your Class A, B, or C
network. Unless you have
been assigned many major networks, you really need to
subnet.
A subnet mask is defined for each IP address. The subnet
mask identifies
which portion of the 4 octets is used to identify the
data link, with the
remaining bits identifying the node. If you want no
subnetting, use these
default masks (255 - strictly follow number, 0 - wildcard):
Class A: 255.0.0.0 Ip Range starting with : 1-126
Class B: 255.255.0.0 Ip Range : 128-191
Class C: 255.255.255.0 Ip Range : 192-254
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