How to Check SSL Certificate Expiry Free — Avoid Site Downtime
Why SSL Certificates Expire
SSL/TLS certificates are issued with a fixed validity period — typically 90 days (Let's Encrypt) or 1-2 years (paid CAs). An expired certificate causes browsers to show a security warning, effectively blocking visitors from accessing your site and destroying trust.
What the SSL Checker Shows
FreeIPLookup's SSL checker displays the certificate's common name (CN), issuer/CA, issue date, expiry date, days remaining, Subject Alternative Names (SANs), and chain validation status. Red warnings appear for certificates expiring within 30 days.
Setting Up Renewal Reminders
Check certificates for all your domains regularly. Create a calendar reminder 30 days before expiry. For auto-renewal setups (Let's Encrypt + Certbot), verify that the renewal cron job is actually running — it can silently fail if DNS changes or file permissions break.
Common SSL Issues
Mixed content warnings (HTTPS page loading HTTP resources). Mismatched CN (certificate issued for www.domain.com but accessed via domain.com). Chain incomplete (intermediate certificate not installed). Self-signed certificate (no trusted CA). FreeIPLookup's SSL checker flags all of these.
Frequently Asked Questions
Check your SSL certificate
Use FreeIPLookup's SSL checker to verify certificate validity, expiry date, and issuer — free, no sign-up.
Open SSL Checker