Free IP and network diagnostic tools

Quick network checks for people troubleshooting home connections, DNS, websites and mail servers. Each guide explains what the corresponding test can — and cannot — tell you.

Show my IP and basic port results
What is my public IP address?Find the IP address visible to websites and learn how public IPv4, IPv6, ISP location, VPNs and routers affect your connection.Online port exposure checkerCheck commonly exposed TCP ports from outside your network, understand open versus filtered results, and troubleshoot router and firewall access.DNS and email authentication checkerInspect DNS, MX, SPF, DMARC and common DKIM selector hints, with explanations for mail delivery, spoofing prevention and domain setup.Website HTTPS and security checksReview HTTPS availability, TLS certificate validity, security headers, DNS and CDN signals for a public website, with clear limits of the results.Browser privacy and WebRTC leak testLearn how WebRTC IP candidates, STUN requests, local addresses and browser privacy signals work, then run an optional privacy check.Advanced network diagnostics — coming for registered usersLearn about planned extended TCP port, DNS, mail and website diagnostics, with downloadable reports reserved for future registered users.
These remote diagnostic results are point-in-time observations, not a security certification. Scan only systems you own or have permission to test.