IP addresses & networking

Check a public IP, calculate IPv4 subnets and understand IPv6 address notation.

Choose your next check

3 focused tools. Choose a module and follow the evidence.

Find the public IP seen by an external service and inspect your connection’s browser signals.

Calculate an IPv4 CIDR network, mask, broadcast address and usable host range.

Expand and compress an IPv6 address and identify common address scopes.