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.
Subnet Calculator
Results
Quick split:
Cloud-Reserved Addresses
Choose a cloud provider and calculate.
Cloud providers reserve addresses differently. Verify critical production designs against your provider documentation and organization standards.
Binary View
Hosts → Prefix (Reverse Lookup)
Find the smallest prefix that gives you at least N usable hosts.
IP in CIDR Check
Test whether an address falls inside a network and classify it.