IPv4 Subnet Calculator
Calculate network, broadcast and usable host ranges
100% private. Your files and inputs never leave your device — everything runs locally in your browser.
How to Use IPv4 Subnet Calculator
Calculate network, broadcast and usable host ranges. No signup, no uploads, no watermarks.
- 1
Enter your numbers in the input fields.
- 2
Choose the calculation options or frequency.
- 3
The result updates instantly as you type.
- 4
Review the breakdown, chart, or schedule, and copy the answer.
Why choose IPv4 Subnet Calculator?
- No uploads — your files never leave your device.
- Free forever with no signup, no watermarks, and no limits.
- Works on any device with a modern browser — no installs.
- Fast, private, and built for getting the job done in seconds.
Frequently Asked Questions
What is a subnet mask?▾
A subnet mask marks which bits of an IPv4 address identify the network and which identify the host. A /24 mask is 255.255.255.0 and leaves 8 host bits.
Why are the first and last addresses special?▾
The network address (all host bits zero) identifies the subnet itself, and the broadcast address (all host bits one) reaches every host on it. Neither is usable as a host.
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