IP Tools
CIDR Calculator
Calculate subnet mask, network, broadcast, and host range for IPv4 CIDR blocks.
CIDR Calculator
Calculate subnet mask, network address, broadcast, and host range for IPv4 CIDR.
About CIDR Calculator
Calculate subnet details (mask, network, broadcast, host range) for IPv4 CIDR blocks.
What this tool does
CIDR Calculator helps you validate and analyze IP information quickly, without third-party APIs.
Why it matters
IP checks are useful for debugging DNS issues, security reviews, and server configuration.
- Catch formatting mistakes instantly.
- Reduce misconfiguration and downtime risk.
- Make audits faster for teams and clients.
Pro tip
Always verify results from multiple sources when making security decisions.
FAQ
Do you store my input?
No. Inputs are processed to generate results and are not intended to be stored.
Does it work on mobile?
Yes. The layout is responsive.
Is it free?
Yes.
Related tools
Pro tip: pair this tool with What is My IP and Bulk GEO IP Locator for a faster SEO workflow.