Opens a TLS connection to port 443 and reads the certificate the server actually presents.
Checks one hostname at a time. No stored results, no recurring checks, no email alerts.
Checking...
Check failed
Expiry date
Days remaining
Valid from
Issuer
Subject Alternative Names
Subject
Chain depth
Chain complete
SHA-256 fingerprint
Serial number
What this tool cannot do: Certline checks one hostname at a time. It does not scan ranges, enumerate subdomains, send alerts, or store results. No accounts, no email, no recurring checks. If a host cannot be reached, the check does not complete — that is a connection failure, not a finding about your certificate.