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cs.subnet-calculator-cidr Calculator
Calculates network address, broadcast address, usable host range, and number of hosts for any CIDR subnet notation. Every network engineer needs this daily — /24 gives 254 hosts, /28 gives 14, knowing the formula makes subnetting mental arithmetic.
Inputs
Ip Third Octet
Reference formula or conversion factor shown for context.
Ip Fourth Octet
Reference formula or conversion factor shown for context.
Cidr Prefix
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Results
usable hosts per subnet
Number of usable host IP addresses in the subnet, after reserving the network address and broadcast address.
total addresses
The combined total across all inputs and components.
network address
Sample size or count used in the calculation.
broadcast address
Reference formula or conversion factor shown for context.