New tricks for your old email.

TLS Checker

This tool performs validity and remaining time on TLS certificates being used by your live services. It can use STARTTLS to fetch the existing X.509 certificates your services are currently using, testing the service as your users would.

TLS Check Results

A note about caching

Results from previous runs are cached for a few minutes as an abuse deterrent. This means that the actual X.509 certificates will only be checked once every few minutes.

Test results include the UTC time at which they were compiled. You can use this to ensure you’re acting on fresh results.