IP/CIDR Calculator

Parse IP addresses, calculate subnet masks, expand CIDR ranges, detect private/reserved networks, and check subnet membership.

IP CIDR Subnets

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This tool runs entirely in your browser. No data is sent to any server.

How this works

IP Address and CIDR Subnet Analysis Parse IP addresses, calculate subnet ranges, identify private/reserved networks, and expand CIDR notation for firewall rules and network forensics.

Comparing (/4):

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