Certificate Transparency Checker

Certificate Transparency

SHA-256 {{ sha256Hex }}

{{ entryCount }} entr{{ entryCount === 1 ? 'y' : 'ies' }} First notBefore {{ firstNotBefore }} Last notAfter {{ lastNotAfter }} Revoked flag present

Certificate:

ID	notBefore	notAfter	Revoked	Issuer	DNS names	Copy
{{ row.id }}	{{ row.not_before_local }}	{{ row.not_after_local }}	{{ row.revoked ? 'Yes' : 'No' }}	{{ row.issuer_friendly \|\| row.issuer_name }}	{{ row.dns_names.join(', ') }} —
No CT entries returned for this certificate fingerprint.

Tags: Diagnostics , Networking , PKI , Security

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Certificate Transparency Checker

This tool checks whether a given X.509 certificate appears in Certificate Transparency (CT) logs. It computes the certificate SHA-256 fingerprint, queries CT data, and returns matching log entries.

What You Can Paste

PEM certificate: -----BEGIN CERTIFICATE----- …
Base64-encoded DER certificate

Notes

This tool uses the public Cert Spotter CT API for lookups.
Some certificates may not appear immediately after issuance due to log submission and aggregation delays.