Free SSL & TLS certificate checker
Verify your certificate, expiry, hostname match and TLS configuration across your estate — not just one host.
Free · no account · instant.
What it checks
We flag expired, soon-to-expire and untrusted certificates before they cause an outage.
We detect certificates that don't match the host serving them — a common misconfiguration.
Outdated protocol versions and weak configurations are surfaced.
Unlike single-host tools, we check certificates across the subdomains we discover.
Frequently asked
It inspects certificate validity, expiry, hostname match and TLS configuration for the hosts on your domain, and flags anything risky.
Yes — it checks the certificates of the subdomains discovered during the scan, not just the root domain.
Yes, with no account. TLS posture is included in the free exposure report.
Want this continuously, not once?
The free tool is a snapshot. SICenter monitors your whole estate and alerts you the moment something changes.
Start monitoring free