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Subnetting Class C Addresses

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The valid hosts would be defined as the numbers between the subnets, minus the all-host- bits-off and all-host-bits-on numbers.

To find the hosts, first find your subnet: turn all the host bits off, then turn all the host bits on to find your broadcast address for the subnet. The valid hosts must be between those two numbers. Table 3.3 shows the 0 subnet, valid host range, and broadcast address. Table 3.4 shows the 64 subnet, valid host range, and broadcast address. Table 3.5 shows the 128 subnet, and Table 3.6 shows the 192 subnet (the subnet and host bits combine to form one byte).

Subnet

Host

Meaning

00

000000 = 0

The network (do this first)

00

000001 = 1

The first valid host

00

111110 = 62

The last valid host

00

111111 = 63

The broadcast address (do this second)

TABLE 3.3

Subnet 0

Subnet

Host

Meaning

01

000000 = 64

The network

01

000001 = 65

The first valid host

01

111110 = 126

The last valid host

01

111111 = 127

The broadcast address

TABLE 3.4

Subnet 64

Subnet

Host

Meaning

10

000000 = 128

The subnet address

10

000001 = 129

The first valid host

10

111110 = 190

The last valid host

10

111111 = 191

The broadcast address

TABLE 3.5

Subnet 128

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