Step-by-step instructions
- Enter or select CIDR prefix length.
- Tap Calculate.
- Review the result shown directly below the calculator.
IPv4 Subnet Host Calculator
Calculate usable hosts from CIDR prefix length.
How to use the IPv4 Subnet Host Calculator
Calculate usable hosts from CIDR prefix length.
What the inputs mean
- CIDR prefix length
- Enter the measurement shown, using consistent units.
Formula or calculation method
The calculator applies the standard mathematical relationship for the labeled inputs and returns the computed result automatically.
Example
Enter a realistic value for CIDR prefix length and tap Calculate to see the computed result.
How to understand the result
Use the result as an estimate based on the values you entered. For planning decisions, double-check that the input units and assumptions match your real situation.
Tip: Keep all values in compatible units and use values from the same time period when the calculator compares two amounts.