IP Subnet Calculator
Use this ip subnet calculator entirely in your browser.
Subnet mask: 255.255.255.0
Broadcast: 192.168.1.255
Usable hosts: 254
Host range: 192.168.1.1 – 192.168.1.254
Calculations happen locally in your browser.
How to use this calculator
- Enter the labelled values and review the live result.
- Review the live result and use Copy result when you need to share it.
How the calculation works
Bitwise CIDR masking identifies network and broadcast addresses locally.
Formula
Bitwise CIDR masking identifies network and broadcast addresses locally.
Step-by-step calculation
- Enter the labelled values and review the live result.
- Bitwise CIDR masking identifies network and broadcast addresses locally.
- Check the displayed result, then copy it if needed.
Worked example
192.168.1.42/24 belongs to network 192.168.1.0/24.
Risk guidance
Frequently asked questions
Does this tool send my inputs anywhere?
No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.
How should I use the result?
Check that the entered units and values match your situation, especially around dates, breaks, and rounding.
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