How To Determine How Many Subnets Are Needed?
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To determine how many subnets are needed, you will need to determine the following:
1. The number of hosts per subnet
2. The range of IP addresses available
3. The network and subnet mask size Once you have the above information, you can use the following calculation to determine the number of subnets needed:
Number of subnets = 2^(Number of bits in the subnet mask – Number of bits in the network mask)
For example, if there were 5 hosts per subnet and the range of IP addresses were 192.168.0.0/24, then the calculation would be:
Number of subnets = 2^(24–16) = 2^8 = 256