3Com corebuilder 3500 Implementation Manual page 266

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Figure 44 Subnet Masking

1 1 1 1 1 1 1 1 1 1

Figure 45 shows an example of an IP address that includes network,

subnet, and host parts. Suppose the IP address is 158.101.230.52 with a

subnet mask of 255.255.255.0. Since this is a Class B address, this

address is divided as follows:

158.101 is the network part

230 is the subnet part

52 is the host part

As shown in this example, the 32 bits of an IP address and subnet mask

are usually written using an integer shorthand. This notation translates

four consecutive 8-bit groups, octets, into four integers that range from 0

through 255. The subnet mask in the example is written as

255.255.255.0.

Traditionally, subnet masks were applied to octets in their entirety.

However, one octet in the subnet mask can be further subdivided so that

part of the octet indicates an extension of the network number, and the

rest of the same octet indicates the host number, as shown in Figure 45.

Take the IP address

Apply the subnet mask

1 1 1 1 1 1 1 1 1 1 1 1 1

Result = subnet/host boundary

Subnet and Host