SMC Networks ADSL Barricade SMC7204BRA User Manual page 165

Appendix A
The first part of every IP address contains the network ID, and
the rest of the address contains the host ID. The length of the
network ID depends on the network's class (see following
section). Figure 62 shows the structure of an IP address.
Class A
Class B
Class C
Here are some examples of valid IP addresses:
Class A: 10.30.6.125 (network = 10, host = 30.6.125)
Class B: 129.88.16.49 (network = 129.88, host = 16.49)
Class C: 192.60.201.11 (network = 192.60.201, host = 11)
168
Field 1
Network ID
Network ID
Network ID
Table 4. IP Address structure
Field 2 Field 3
Host ID
Field 4
Host ID
Host ID