Geolocation, ISP and network details for any IP address.
Registration and ownership details for a domain.
A, AAAA, MX, TXT and NS records for a domain.
Find the PTR hostname(s) for an IP address.
Check an IP against Spamhaus, SpamCop and Barracuda DNSBLs.
Inspect a domain certificate: issuer, expiry, SAN, trust.
Domain registration date, age, expiry and registrar.
Live status and uptime history for monitored sites.
Network, broadcast, mask, host range and counts for a CIDR block.
Check common TCP ports on a host.
See if your browser leaks your real IP via WebRTC.
Your user-agent string and browser fingerprint.
Measure your download and upload speed.