Realize, once you start subnetting, you start losing IP addresses very fast. Recognize that a.b.c.0 and a.b.c.255 are reserved. The first for the physical line/host and the latter for broadcasting. When you start subnetting, you imediately lose the first and last subnet for similiar reasons. Also, the first and last numbers in the new sub-network are reserved as previously stated for line and broadcasting. This leads to an atrocious waste of usable IP addresses. However, if you have a Class C block to spare (give me a holler) this is one way to break it down.
|Subnet Mask||Binary||Usable Subnets||Binary of Subnets||Usable IP/Subnet|
If you want, say 5 sub-networks, you would break it along the x.x.x.224 subnet mask, for a total of six sub-networks and the last subnet would be idle and totally unused.
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