CIDR Calculator
Enter an IPv4 address and prefix length to calculate network details such as subnet mask, network address, broadcast address, and usable range.
CIDR Calculator tool
Example: 192.168.1.10 / 24
Result will appear here.
| Metric | Value |
|---|
Privacy: calculations run locally in your browser. No network data is stored or transmitted.
CIDR notation combines an IPv4 address with a prefix length such as /24. The prefix length determines how many leading bits belong to the network.
Examples
- 192.168.1.10 / 24 → network 192.168.1.0, broadcast 192.168.1.255
- 10.0.5.10 / 16 → network 10.0.0.0
- 172.16.8.1 / 20 → mask 255.255.240.0
FAQ
- What does this CIDR calculator do?
It calculates subnet mask, wildcard mask, network address, broadcast address, and usable host range from an IPv4 address and prefix length.
- What CIDR range is allowed?
This tool accepts IPv4 prefix lengths from /0 to /32.
- Does it show usable hosts?
Yes. It shows the first and last usable host when that concept applies.
- Is my input stored?
No. All calculations run locally in your browser.