Free IP Tools

Professional utilities to work with IP addresses, CIDR notation, and DNS lookups

IP to Integer

Convert IPv4/IPv6 addresses to integers and back

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CIDR To IPv4

Convert CIDR notation to IPv4 ranges and subnet masks

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CIDR To IPv6

Convert IPv6 CIDR blocks to network ranges

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IP Range To CIDR

Convert IP ranges to CIDR notation

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IPv4 to IPv6

Map IPv4 addresses to their IPv6 equivalents

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IP to Hostname

Perform reverse DNS lookups on IP addresses

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