reserved ip ranges

[Gregory Nowak]

Hi all.

I know that 10.0.0.0 - 10.255.255.255, 172.16.0.0 - 172.31.255.255,
and 192.168.0.0 - 192.168.255.255 are reserved for class a, b, and c
networks respectively. However, I was wondering why there are 3
different classes of networks (and reserved ip ranges), and how one
decides which class to use?

Thanks.

Greg


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