IP Subnet Calculator
Calculate network address, broadcast address, usable hosts and IP range from an IPv4 address and CIDR prefix. Free, fast and private.
Your result will appear here.
How to use IP Subnet Calculator
- Enter an IPv4 address such as 192.168.1.10.
- Enter the CIDR prefix, for example 24 for a /24 network.
- Click Calculate Subnet to see the network, broadcast and host range.
Note: this tool runs in your browser. Nothing is uploaded.
Frequently Asked Questions
Is this tool free?
Yes, it is 100% free with no sign-up. Your data stays in your browser.
Do I need to install anything?
No. It works in any modern browser on phone, tablet or computer.
Is my data uploaded?
No. This tool runs entirely in your browser and your input is never uploaded to a server.
What is a CIDR prefix?
It is the number of network bits in the address. /24 means the first 24 bits are the network and the last 8 bits are hosts — 256 addresses, 254 usable.