IP / Subnet Calculator
Network, broadcast, mask and host range of any subnet.
How to use the IP / Subnet Calculator
- Type an address and prefix
Like 192.168.1.10/24, or a mask like 255.255.255.0.
- Read the subnet
Network, broadcast, mask, host range and host count.
- Try other sizes
Quick buttons change the prefix.
Questions
Is it really free, with no sign-up?
Yes, completely. There's no sign-up, no login and no daily limit: just open the page and start. It works in your browser on any computer, phone or tablet with nothing to install, and your files are never uploaded. Everything happens on your device.
How many hosts are in a /24?
256 addresses, of which 254 can be used by devices (the first is the network, the last the broadcast).
Is my data sent anywhere?
No. Everything runs in your browser, on your device, so nothing you paste or open is uploaded.