Free IP Address & Network Tools

Choose a calculator for address and network conversions, or use a lookup tool to explore IP data.

CIDR Subnet Calculator Find the network address, subnet mask, and address range for an IPv4 or IPv6 prefix.
IP Range ↔ CIDR Converter Convert an IPv4 or IPv6 range to CIDR blocks, or find the addresses a block covers.
IPv6 Expander & Compressor Expand an IPv6 address into eight groups or format it in compressed notation.
IP to Integer Converter Convert IPv4 and IPv6 addresses to exact decimal integers and back.
Bulk IP Lookup Look up location and network data for multiple IP addresses.
IP WHOIS Lookup Look up the approximate location, ISP, and network details for a public IP address.