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Appendix C IP Addresses and Subnetting

User’s Guide

227

Subnetting

You can use subnetting to divide one network into multiple sub-networks. In the

following example a network administrator creates two sub-networks to isolate a

group of servers from the rest of the company network for security reasons.

In this example, the company network address is 192.168.1.0. The first three

octets of the address (192.168.1) are the network number, and the remaining

octet is the host ID, allowing a maximum of 2

– 2 or 254 possible hosts.

The following figure shows the company network before subnetting.

Figure 125 Subnetting Example: Before Subnetting

You can “borrow” one of the host ID bits to divide the network 192.168.1.0 into

two separate sub-networks. The subnet mask is now 25 bits (255.255.255.128 or

/25).

The “borrowed” host ID bit can have a value of either 0 or 1, allowing two

subnets; 192.168.1.0 /25 and 192.168.1.128 /25.

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