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Certificate Transparency

Every certificate ever issued for a domain

Certificate Transparency logs are a public, append-only record of every SSL/TLS certificate a CA issues. Search any domain to see its certificates, who issued them, what's new, and which subdomains they reveal.

Try: github.com · cloudflare.com
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What you'll see
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Issuers & timeline
Which CAs issued certs, and what's been issued recently (7/30/90 days).
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Subdomains from SANs
An inventory of hostnames discovered in certificate Subject Alternative Names.
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Sensitive hosts & wildcards
Flags admin/VPN/staging-style hostnames and wildcard certificates.

Catch certificates you didn't request

Monitoring alerts you when a new certificate is issued for your domain — an early signal of mis-issuance or shadow IT.

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