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IP subnet calculator
Network, broadcast, usable host range and mask for any IPv4 or IPv6 CIDR, and split it into subnets.
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- Works on any device
About IP subnet calculator
Enter an IPv4 or IPv6 address with a CIDR prefix, like 192.168.1.0/24, to see the network address, broadcast, mask and usable host range. A /24 has 256 addresses and 254 usable hosts. You can also split a network into smaller subnets of equal size.
How to use IP subnet calculator
- Type what you want to look up above.
- The answer appears instantly, explained in plain words.
- Copy what you need.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
Why are two addresses unusable in an IPv4 subnet?
The first address identifies the network and the last is the broadcast address. Hosts get everything between, so usable hosts equal 2 to the power of host bits, minus 2.
Is IP subnet calculator free?
Yes. IP subnet calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.