Free tool
What's My Site Running?
Type your address. See the software and versions your site shows the world, and the known flaws in each.
Questions
How the Check Works
What does this check?
The web server, language and CMS your site shows to every visitor, and their versions when it shows them. Nothing is logged in to or changed.
My versions are hidden. Is that bad?
No, that's good: it gives attackers less to go on. It does mean we can't tell you which flaws apply, so pick your software below and we'll alert you to new ones.
Why might the count be too high?
Ubuntu, Debian and Red Hat patch old version numbers in place. A server can show "nginx 1.18" and still have every fix. We say so when we can tell.
What about the rest of my server?
Certificates, security headers, open ports and email settings are in Bobble Solutions' free website check.