Subnet Calculator
Enter an IPv4 address and dotted-decimal subnet mask to calculate network details.
Subnet Calculator tool
Example: IP 192.168.1.10 with mask 255.255.255.0
Result will appear here.
| Metric | Value |
|---|
Privacy: calculations run locally in your browser. No network data is stored or transmitted.
The subnet mask is converted to a binary prefix, then used to calculate:
- Network address
- Broadcast address
- Wildcard mask
- Usable host range
Examples
- 192.168.1.10 + 255.255.255.0 → network 192.168.1.0
- 10.0.5.20 + 255.255.0.0 → prefix /16
- 172.16.8.1 + 255.255.240.0 → prefix /20
FAQ
- What input does this subnet calculator use?
It uses an IPv4 address and a subnet mask in dotted-decimal form such as 255.255.255.0.
- What does it calculate?
It calculates the network address, broadcast address, wildcard mask, CIDR prefix, and usable host range.
- Does it validate the subnet mask?
Yes. It checks that the mask is a valid contiguous IPv4 subnet mask.
- Is my data stored?
No. The calculation runs locally in your browser.