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CRL distribution point checker

Extracts the CRL distribution points from a pasted PEM certificate, fetches each endpoint with a direct GET and the proxy as fallback, and reports whether the answer is a DER-encoded CRL, sniffed from the leading SEQUENCE bytes.
Certificate in PEM form

What this tool does not do: it never decides whether a serial number is revoked. That question needs the signed CRL downloaded, parsed, and checked against the issuer, and a half-done version of it produces confident wrong answers, so the check stops at endpoint liveness and the DER header. A certificate with no CRL distribution points is normal for short-lived certificates (Let's Encrypt issues 90-day certs with no CDP), and browsers mostly ignore CRLs anyway; many non-browser clients hard-fail when the endpoints are down. For the definitive answer, run the commands below against the real certificate and CRL.

The definitive revocation check, with your files

openssl x509 -in cert.pem -noout -text | grep -A4 "CRL Distribution Points"

curl -o crl.pem http://crl.example.com/intermediate.crl

openssl crl -in crl.pem -noout -text
Options

More web & auth tools

- Certificate & CSR (/web/certificate)
- HTTP header parser (/web/headers)
All web & auth tools (/web)

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Canonical HTML: https://nutter.tools/web/crl-distribution-point-checker
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