CIDR ↔ IP Range
Three tools in one: convert a CIDR block to its IP range; convert any IP range to the minimal list of CIDR blocks that cover it exactly; or paste a list of CIDRs and single IPs to aggregate them into the smallest possible set of summarised supernets. Everything runs client-side — no data leaves your browser.
Enter any CIDR notation — host bits are automatically masked to the network address.
The minimal set of CIDR blocks that cover exactly this range — no more, no less.
Enter CIDRs (e.g. 10.0.0.0/24) or single IPs — one per line. Adjacent or overlapping blocks are merged into the smallest covering supernet.
Need help with your network?
From IP addressing to full network design — Peritus Digital can help.
Our Newcastle team designs and manages networks for Hunter Region businesses — VLANs, firewall rules, SD-WAN, structured cabling and everything in between. If you're working with CIDR blocks, you're probably planning infrastructure. Let's talk.