Host Count Calculator
Calculate total IPv4 addresses and traditional usable hosts from a prefix length.
Calculator
Result
About this calculator
Calculate total IPv4 addresses and traditional usable hosts from a prefix length.
Enter valid values, then select Calculate. The calculation runs in your browser and does not require an account.
How to use this calculator
What to enter
Enter or select the following as requested: CIDR prefix length. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The output is a unit conversion, data-size estimate, transfer-time estimate, or system/network metric calculated from the values entered. Confirm whether units are decimal or binary, bits or bytes, and whether the rate is theoretical or measured; protocol overhead and real-world performance can change the result.
When to use it
Use this to convert technical values, estimate file transfers, or understand device and network capacity. Compare like-for-like units and validate estimates against the actual device, connection, or platform when timing matters.