IPv4 Subnet Calculator
Calculates network address, broadcast address, subnet mask, wildcard mask, usable host range, and host count from an IPv4 address and CIDR prefix.
| CIDR Notation | 192.168.1.0/24 |
| Network Address | 192.168.1.0 |
| Broadcast Address | 192.168.1.255 |
| Subnet Mask | 255.255.255.0 |
| Wildcard Mask | 0.0.0.255 |
| First Usable Host | 192.168.1.1 |
| Last Usable Host | 192.168.1.254 |
| Total Addresses | 256 |
| Usable Hosts | 254 |
IPv4 Subnet Calculator — Free Online Tool
Calculates network address, broadcast address, subnet mask, wildcard mask, usable host range, and host count from an IPv4 address and CIDR prefix.
How to use the IPv4 Subnet Calculator
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
Is the IPv4 Subnet Calculator free to use?
Yes. The IPv4 Subnet Calculator is completely free, with no signup, no ads inside the tool, and no hidden limits.
Does the IPv4 Subnet Calculator upload my data?
No. The IPv4 Subnet Calculator processes everything locally in your browser. Your input is never sent to a server, so it stays private even on shared devices.
Does the IPv4 Subnet Calculator work offline?
After the page loads, the IPv4 Subnet Calculator runs entirely in your browser, so it keeps working without a network connection.
Free & private — why use this IPv4 Subnet Calculator
The IPv4 Subnet Calculator runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.