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## 2. Introduction

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.

## 2.1 Other sources of information

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:-

- The Linux Network Administrators Guide.
- The Linux System Administration Guide.
- TCP/IP Network Administration by Craig Hunt, published by O'Reilly and Associates.

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