IP & Subnet Tools
IP-in-CIDR Checker
Enter an IP and a CIDR block to see if the address is inside the range.
📖 New to this? Read What Is CIDR Notation?.
❓ Frequently Asked Questions
What is the IP-in-CIDR Checker used for?
Check whether an IPv4 address falls inside a given CIDR range.
Is the IP-in-CIDR Checker 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-in-CIDR Checker?
No. It works in any modern web browser on desktop, tablet, or phone — no downloads, no browser extensions, and no account required.