HTTPS on port 443
We connect to your domain using SNI, just like a browser, and read the certificate it presents.
Web SSL Checker
Check website SSL
Enter a domain name to check its HTTPS certificate on port 443.
The test only connects to port 443 and reads the certificate. It does not fetch any page content.
Connection report
Test results
Validity and trust
We check the validity dates, domain name match and chain verification. You will see the issuer, SAN names and expiry date.
What does the server negotiate?
See the TLS version and cipher suite used for the connection. We flag outdated TLS and certificates that expire soon.
Good to know
Which name should I enter?
Enter the domain exactly as in the address bar, e.g. example.com or www.example.com. Each of these names can have its own certificate, so check both if needed.
What does a certificate warning mean?
The certificate may be invalid, issued for a different name or not verifiable with our server’s trusted CA store. A missing intermediate certificate on the server also causes a warning. We also show it if the certificate expires within 3 days.
Where does the test run from?
From HOSTEDBY.PL infrastructure, against one public IP address returned by DNS. The result reflects the moment of the check. We do not fetch page content, and the tool does not store reports.