Calculate network, broadcast, host range from IP and CIDR
Processed client-side in your browser — files never leave your device.
Free, with no signup, account, or usage limits.
Works on any modern browser, including mobile.
About this tool
Use IP Subnet Calculator when you need to calculate network, broadcast, host range from IP and CIDR. Processing runs locally in your browser — your input is not uploaded to ThothBox.
How to use
Open IP Subnet Calculator and enter the values you want to calculate or convert.
Adjust units or options if shown.
Read the result instantly.
Copy the output or try another set of inputs.
FAQ
What does IP Subnet Calculator do?
Calculate network, broadcast, host range from IP and CIDR.
Is IP Subnet Calculator private?
Yes for typical use: input is processed in your browser and is not uploaded to ThothBox.
Is IP Subnet Calculator free?
Yes. It is free to use with no signup required.
How do I use IP Subnet Calculator?
Open the IP Subnet Calculator tool, then open IP Subnet Calculator and enter the values you want to calculate or convert.