FREE · DEVELOPER TOOLS
IPv4 Subnet Calculator.
Calculate CIDR masks, address ranges and usable IPv4 hosts locally.
How to use IPv4 Subnet Calculator
Enter the required text or settings and generate locally. Review the displayed algorithm and limits before copying or downloading.
How it works
Calculate CIDR masks, address ranges and usable IPv4 hosts locally. IPv4 only. /31 follows point-to-point conventions; /32 represents a single address. Web Crypto uses the browser’s secure random generator; pasted data is not sent to a server.
Example
Generate the supplied public example settings to inspect the result.
Questions about IPv4 Subnet Calculator
Is IPv4 Subnet Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
IPv4 only. /31 follows point-to-point conventions; /32 represents a single address. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.