With available IP network numbers rapidly becoming an endangered species, efficient use of this increasingly scarce resource is important.
This document describes how to split a single IP network number up so that it can be used on several different networks.
This document concentrates on C Class IP network numbers - but the principles apply to A and B class networks as well.
There are a number of other sources of information that are of relevance for both detailed and background information on IP numbers. Those recommended by the author are:-