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OCSP Certificate Status Checker

Check a TLS certificate's revocation status through OCSP, the CRL and the stapled response the server sends.

Examples:

Enter a domain to check its certificate revocation status

Related Tools

SSL/TLS Checker

Check a domain’s SSL certificate - expiry date, issuer, covered domains, and whether HTTPS is currently reachable.

CT Log Search

Search Certificate Transparency logs for all SSL/TLS certificates issued for a domain. Detect unauthorized certificates and track your issuance history via crt.sh.

HTTP Inspector

Inspect response headers and grade the HTTP security configuration for any URL. One request - raw headers and an A‑F security score side by side.

About this tool

OCSP (Online Certificate Status Protocol) allows browsers and clients to check in real time whether a TLS certificate has been revoked before its expiry date. Revocation happens when a certificate is compromised, mis-issued, or the domain owner requests it. This tool has VLANlab's server connect to the domain and read the certificate it presents, then asks the issuing CA: through its Certificate Revocation List (CRL), and through its OCSP responder when the certificate names one in its Authority Information Access (AIA) extension. Many certificates, including all from Let's Encrypt, no longer name an OCSP responder, so the CRL is often the only answer. When the web server staples an OCSP response to the connection (OCSP stapling, which saves clients a round-trip), the tool shows that response too.