IP addresses & networking
Check a public IP, calculate IPv4 subnets and understand IPv6 address notation.
Explore the tools
3 focused tools, with an explanation and a practical guide for each check.
Network
← All Network & DNS toolsPublic IP & connection
Find the public IP seen by an external service and inspect your connection’s browser signals.
External IP lookupNetworkIPv4 subnet calculator
Calculate an IPv4 CIDR network, mask, broadcast address and usable host range.
Local analysisNetworkIPv6 address inspector
Expand and compress an IPv6 address and identify common address scopes.
Local analysis