IP & Subnet Tools
CIDR Aggregator
Paste IPs and CIDRs (one per line) to merge them into minimal CIDR blocks.
📖 New to this? Read What Is CIDR Notation?.
❓ Frequently Asked Questions
What is the CIDR Aggregator used for?
Merge a list of IPs and CIDR blocks into the smallest set of CIDRs.
Is the CIDR Aggregator 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 CIDR Aggregator?
No. It works in any modern web browser on desktop, tablet, or phone — no downloads, no browser extensions, and no account required.