IP & NETWORK UTILITIES
IP & Subnet Calculator
Calculate IPv4 and IPv6 network details, convert an address range into minimal CIDR blocks, or check whether two networks overlap. All calculations run locally on this server; no external lookup is required.
Subnet calculator
Enter an address with a prefix. Host bits are normalized to the network automatically.
IP range to CIDR
Convert an inclusive start/end range into the smallest set of CIDR networks.
Network overlap checker
Check whether two IPv4 networks or two IPv6 networks share any addresses.