IP & Subnet Tools
IP Range to CIDR
Enter a start and end IP to get the CIDR blocks covering the range.
📖 New to this? Read What Is CIDR Notation?.
Example
192.168.0.0 to 192.168.0.255 collapses to a single block: 192.168.0.0/24.
❓ Frequently Asked Questions
What is the IP Range to CIDR used for?
Convert a start and end IP address into the smallest list of CIDR blocks that covers it.
Is the IP Range to CIDR free and private?
Yes — it's completely free and runs entirely in your browser. Whatever you enter stays on your device and is never uploaded to any server.
Do I need to install anything to use the IP Range to CIDR?
No. It works in any modern web browser on desktop, tablet, or phone — no downloads, no browser extensions, and no account required.