CIDR Calculator
Compute network, broadcast, mask, and host range from CIDR notation. Enter your values, click Calculate, and get the full result with its breakdown — everything is processed on your device, nothing is sent to a server.
All calculations run in your browser. Your data is never sent to our servers.
Example
Example Input
192.168.1.10/24
Example Output
network 192.168.1.0, broadcast 192.168.1.255, 254 hosts
How to Use
- 1Fill in each input field with the values you want to compute.
- 2If there are choices (units, mode, operation), pick what you need.
- 3Click the Calculate button (or press Ctrl+Enter).
- 4The main result and its breakdown appear in the Result area. Click Copy to copy it.
About the CIDR Calculator
The CIDR Calculator breaks down an IPv4 block from CIDR notation (e.g. 192.168.1.0/24): network address, broadcast, subnet mask, wildcard mask, first & last host, total addresses, and usable hosts. You can type IP/prefix directly or set the prefix separately.
Useful for network planning, firewalls, and routing. Computed natively with 32-bit bit operations.
FAQ
Is this CIDR Calculator accurate?
Yes. It uses standard formulas and runs directly in your browser at full JavaScript precision (plus BigInt/decimal.js for large numbers where needed).
Is my data sent to a server?
No. All calculations happen entirely on your device. No values are sent to or stored on our servers.