A single-page IPv4 CIDR calculator built for DevOps and cloud networking work. It runs entirely in your browser with zero network calls. Calculate subnet ranges, usable hosts, masks, wildcard masks, binary details, cloud-reserved addresses, split plans, supernets, overlap checks, and quick IP conversions while offline.
Choose a cloud provider and calculate.
Cloud providers reserve addresses differently. Verify critical production designs against your provider documentation and organization standards.