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Slide245

If the 0 subnet number cannot be used, the netmask will have to change to FFFFFFE0, or 255.255.255.224, to give 3 subnet bits. The subnet numbers in binary are then: 000 001 010 011 100 101 110 111. The numbers 000 and 111 are illegal, leaving 6 networks. The valid IP addresses would then be:

 

Net#    Address Range —- ————-

001     210.20.30.33 to 210.20.30.62

010    210.20.30.65 to 210.20.30.94

011    210.20.30.97 to 210.20.30.126

100    210.20.30.129 to 210.20.30.158

101    210.20.30.161 to 210.20.30.190

110    210.20.30.193 to 210.20.30.222

 

These do not include the network and broadcast addresses.

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