Subnet Calculator
Enter an IPv4 address and dotted-decimal subnet mask to calculate network details.
Example: IP 192.168.1.10 with mask 255.255.255.0
| Metric | Value |
|---|
Privacy: calculations run locally in your browser. No network data is stored or transmitted.
How it works
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
When to use this tool
This tool is designed for quick, practical tasks such as everyday calculations, data formatting, or simple conversions. It is best used when you need fast results without installing software or using complex tools.
When to use
- Quick checks or one-time calculations
- Validating or converting data before using it elsewhere
- Simple tasks that do not require advanced software
When not to use
- Critical financial, legal, or medical decisions
- Large-scale or automated processing
- Situations requiring guaranteed precision beyond basic validation
Always review results before using them in important contexts.
About this tool
This tool helps you perform quick utility operations directly in your browser. It runs entirely in your browser without sending data to a server.
You can use this tool when handling simple tasks without installing additional software. The results should be interpreted as a processed output based on your input data.
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.