SSL Certificate Checker
This tool retrieves and analyses the SSL/TLS certificate presented by a server on port 443.
What it does
- Connects to
hostname:443over TLS - Reads the leaf certificate and its expiry
- Fetches and parses the certificate chain
- Shows protocol (e.g. TLS 1.2 / 1.3) and cipher
- Displays SAN entries and SHA-256 fingerprint
Typical use cases
- Check when a certificate will expire
- Verify which CA issued the certificate
- Confirm the hostname/SAN is correct
- See which TLS version and cipher are negotiated
Notes
This tool does not replace a full SSL test or vulnerability scanner. It is intended as a quick overview. OCSP/CRL status and advanced configuration checks are out of scope.