1.7 Classful Subnetting

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11 Terms

1
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Network address

  • The bits of the subnet mask that are 1

  • Ex. 255.255.0.0 = network address bits of 16, because 8 + 8 bits

2
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Host address/Host ID

  • The bits of the subnet mask that remains 0, not 1

  • Ex. 255.0.0.0 = host ID of 24, because 8+8+8 bits

3
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0 - 127

  • Class A address range

  • Subnet mask of 255.0.0.0

4
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128 - 191

  • Class B address range

  • Subnet mask of 255.255.0.0

5
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192 - 223

  • Class C address range

  • Subnet mask of 255.255.255.0

6
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224 - 239

  • Class D address range, multicast

7
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240 - 255

  • Class E address range, reserved

8
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Finding the network address

  • Change all the host bits to 0

  • Ex. for address 172.16.88.200, the network address is 172.16.0.0 (because Class B, subnet mask of 255.255.0.0)

9
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Finding the host address

  • Add 1 to the network address

  • Ex. network address is 172.16.0.0 + 1 = 172.16.0.1

10
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Finding the broadcast address

  • Set all host bits to 1

  • Ex. address of 172.16.88.200, the broadcast address is 172.16.255.255 (because Class B, subnet mask is 255.255.0.0)

11
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Finding the last host address

  • Subtract one from the broadcast address

  • Ex. broadcast address of 172.16.255.255, -1 = 172.16.255.254