SSL Certificate Checker

The SSL Certificate Checker analyzes a domain's TLS certificate by connecting to the domain on port 443, retrieving the certificate chain, and extracting metadata such as validity window, issuer, and SANs. It returns a structured result including status, expiry date, days to expiry, issuer, SANs, and supported TLS versions for automation workflows. This enables security teams to verify domain trust, plan renewals, and ensure proper TLS deployment. The tool adheres to standard TLS terminology and renders data suitable for programmatic consumption by monitoring systems. It also provides optional revocation checks when available (OCSP/CRL) and can report on cipher suites and chain completeness for deeper TLS health analysis. The output is designed for integration into CI/CD pipelines, security dashboards, and incident response playbooks.\n
Use cases include pre-deployment TLS validation, post-renewal checks, ongoing TLS health monitoring, and rapid incident analysis. The approach focuses on certificate metadata rather than vulnerability scanning, delivering deterministic results that help teams maintain trust and uptime without introducing noise from non-TLS factors.\n
Unique value lies in structured, machine-friendly outputs with clear status interpretation (valid, expired, not_yet_valid, unknown), ISO date formatting, and UTC timestamps, enabling seamless automation and alerting across multi-domain environments.