Network & DNS Tools
Fast, free utilities for developers and sysadmins. No account required.
My IP Address
Detect your public IPv4 and IPv6 address with reverse DNS and ISP information.
DNS Lookup
Query DNS record types across multiple DNS servers.
IPv4 Subnet Calculator
Calculate subnets, host ranges, broadcast addresses, and wildcard masks.
IPv6 Subnet Calculator
128-bit subnet arithmetic with RFC 5952 formatting and address ranges.
Reverse DNS
Look up PTR records, hosted domains, and GeoIP info for any IP address or hostname.
