Subnet Hosts Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the CIDR prefix.
- Press Calculate.
How it works
From the prefix it works out the addresses in the block (2^(32 − prefix)) and the usable hosts (two fewer, for the network and broadcast addresses).
Worked example
/24. 256 addresses, 254 usable hosts.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.