IPv4 Subnet Calculator
About this tool
Calculate network, broadcast, mask, host range, and address counts from CIDR notation.
Privacy
Your input is processed locally in your browser and is not uploaded.
Frequently asked questions
Is my input uploaded?
No. The tool runs locally in your browser and does not upload your input.
Does it support IPv6?
This calculator is for IPv4 CIDR subnets. The IP Address Converter handles individual IPv4 and IPv6 addresses.
Does it work on mobile?
Yes. The interface adapts to phones, tablets, and desktop screens.