Free IP & network tools

See your public IP, location, ASN, ISP and whether a VPN or proxy is detected.

Look up geolocation, ASN, ISP and network details for any IPv4 or IPv6 address.

Check which DNS resolvers your connection uses and whether your VPN is leaking DNS.

Detect whether WebRTC is exposing your real local or public IP behind a VPN.

Check an IP against dozens of DNS blocklists (Spamhaus, SORBS, Barracuda and more).

Scan common TCP ports on a host you own to see what is open and reachable.

Inspect a site's TLS certificate: validity, expiry, issuer and chain.

Fetch a URL's response headers and grade its security headers (CSP, HSTS, etc.).

Look up registration, registrar and nameserver details for any domain (via RDAP).

Check whether a website or service is reachable: DNS, TCP connect and HTTP status.