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Network tools

Small, fast tools for IP addresses, subnets and proxy lists. The calculators run entirely in your browser.

IP address

Your public IP address as websites see it, with its location and network.

Location, network and type of any IPv4 address.

Is your IP on a blocklist, a known proxy or a Tor exit? One risk score from 12 blocklists and our own proxy data.

Find the network behind an IP, or every prefix an AS number announces.

See whether your browser reveals your real IP address through WebRTC, even behind a VPN or proxy.

Which DNS servers see the sites you visit? 8 test lookups show every resolver and whether it bypasses your VPN.

Clean up, deduplicate and convert a proxy list.

See what a proxy reveals about you.

Everything about an IPv4 block in CIDR notation.

Turn any start–end range into the exact list of CIDR blocks.

Divide a network into equal subnets.