Allocating IP Addresses

• The subnet mask is used to define size of a network

• E.g a subnet mask of 255.255.255.0 or /24 implies 32-24=8 host bits

  • 2^8 minus 2 = 254 possible hosts

• Similarly a subnet mask of 255.255.255.224 or /27 implies 32-27=5 hosts bits

  • 2^5 minus 2 = 30 possible hosts

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