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Appendix A IP Addresses and Subnetting

GS-1524/GS-1548 User’s Guide

157

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 90 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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