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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). Table 7 shows the structure of an IP
address.
Table 8. IP address structure
Field1 Field2 Field3 Field4
Class A Network ID Host ID
Class B Network ID Host ID
Class C Network ID Host ID
Following are 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)