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Recognized Logs

The following table includes information about the Certificate Transparency Logs that are recognized by Chromium. It includes information about who operates the log, the name the log has been given, and the URL that can be used for logging certificates or inspecting the certificates that have been logged.

Note: The authoritative list is maintained in the Chromium code base. This is merely informational.

Log Name Log URL Log State Log Spec MMD Temporal Interval Start Temporal Interval End Log Operator Contact Info
Google 'Argon2025h1' log https://ct.googleapis.com/logs/us1/argon2025h1/ Usable RFC6962 86400 2025-01-01T00:00:00Z 2025-07-01T00:00:00Z Google [email protected]
Google 'Argon2025h2' log https://ct.googleapis.com/logs/us1/argon2025h2/ Usable RFC6962 86400 2025-07-01T00:00:00Z 2026-01-01T00:00:00Z Google [email protected]
Google 'Argon2026h1' log https://ct.googleapis.com/logs/us1/argon2026h1/ Usable RFC6962 86400 2026-01-01T00:00:00Z 2026-07-01T00:00:00Z Google [email protected]
Google 'Argon2026h2' log https://ct.googleapis.com/logs/us1/argon2026h2/ Usable RFC6962 86400 2026-07-01T00:00:00Z 2027-01-01T00:00:00Z Google [email protected]
Google 'Xenon2025h1' log https://ct.googleapis.com/logs/eu1/xenon2025h1/ Usable RFC6962 86400 2025-01-01T00:00:00Z 2025-07-01T00:00:00Z Google [email protected]
Google 'Xenon2025h2' log https://ct.googleapis.com/logs/eu1/xenon2025h2/ Usable RFC6962 86400 2025-07-01T00:00:00Z 2026-01-01T00:00:00Z Google [email protected]
Google 'Xenon2026h1' log https://ct.googleapis.com/logs/eu1/xenon2026h1/ Usable RFC6962 86400 2026-01-01T00:00:00Z 2026-07-01T00:00:00Z Google [email protected]
Google 'Xenon2026h2' log https://ct.googleapis.com/logs/eu1/xenon2026h2/ Usable RFC6962 86400 2026-07-01T00:00:00Z 2027-01-01T00:00:00Z Google [email protected]
Cloudflare 'Nimbus2025' https://ct.cloudflare.com/logs/nimbus2025/ Usable RFC6962 86400 2025-01-01T00:00:00Z 2026-01-01T00:00:00Z Cloudflare [email protected]
Cloudflare 'Nimbus2026' https://ct.cloudflare.com/logs/nimbus2026/ Qualified RFC6962 86400 2026-01-01T00:00:00Z 2027-01-01T00:00:00Z Cloudflare [email protected]
DigiCert Yeti2025 Log https://yeti2025.ct.digicert.com/log/ Usable RFC6962 86400 2025-01-01T00:00:00Z 2026-01-01T00:00:00Z DigiCert [email protected]
DigiCert Nessie2025 Log https://nessie2025.ct.digicert.com/log/ Usable RFC6962 86400 2025-01-01T00:00:00Z 2026-01-01T00:00:00Z DigiCert [email protected]
DigiCert 'Wyvern2025h1' Log https://wyvern.ct.digicert.com/2025h1/ Usable RFC6962 86400 2025-01-01T00:00:00Z 2025-07-07T00:00:00Z DigiCert [email protected]
DigiCert 'Wyvern2025h2' Log https://wyvern.ct.digicert.com/2025h2/ Usable RFC6962 86400 2025-07-01T00:00:00Z 2026-01-07T00:00:00Z DigiCert [email protected]
DigiCert 'Wyvern2026h1' https://wyvern.ct.digicert.com/2026h1/ Qualified RFC6962 86400 2026-01-01T00:00:00Z 2026-07-01T00:00:00Z DigiCert [email protected]
DigiCert 'Wyvern2026h2' https://wyvern.ct.digicert.com/2026h2/ Qualified RFC6962 86400 2026-07-01T00:00:00Z 2027-01-01T00:00:00Z DigiCert [email protected]
DigiCert 'Sphinx2025h1' Log https://sphinx.ct.digicert.com/2025h1/ Usable RFC6962 86400 2025-01-01T00:00:00Z 2025-07-07T00:00:00Z DigiCert [email protected]
DigiCert 'Sphinx2025h2' Log https://sphinx.ct.digicert.com/2025h2/ Usable RFC6962 86400 2025-07-01T00:00:00Z 2026-01-07T00:00:00Z DigiCert [email protected]
DigiCert 'Sphinx2026h1' https://sphinx.ct.digicert.com/2026h1/ Qualified RFC6962 86400 2026-01-01T00:00:00Z 2026-07-01T00:00:00Z DigiCert [email protected]
DigiCert 'Sphinx2026h2' https://sphinx.ct.digicert.com/2026h2/ Qualified RFC6962 86400 2026-07-01T00:00:00Z 2027-01-01T00:00:00Z DigiCert [email protected]
Sectigo 'Sabre' CT log https://sabre.ct.comodo.com/ ReadOnly RFC6962 86400 Sectigo [email protected]
Sectigo 'Sabre2025h1' https://sabre2025h1.ct.sectigo.com/ Usable RFC6962 86400 2025-01-01T00:00:00Z 2025-07-01T00:00:00Z Sectigo [email protected]
Sectigo 'Sabre2025h2' https://sabre2025h2.ct.sectigo.com/ Usable RFC6962 86400 2025-07-01T00:00:00Z 2026-01-01T00:00:00Z Sectigo [email protected]
Sectigo 'Mammoth2025h1' https://mammoth2025h1.ct.sectigo.com/ Usable RFC6962 86400 2025-01-01T00:00:00Z 2025-07-01T00:00:00Z Sectigo [email protected]
Sectigo 'Mammoth2025h2' https://mammoth2025h2.ct.sectigo.com/ Usable RFC6962 86400 2025-07-01T00:00:00Z 2026-01-01T00:00:00Z Sectigo [email protected]
Sectigo 'Mammoth2026h1' https://mammoth2026h1.ct.sectigo.com/ Qualified RFC6962 86400 2026-01-01T00:00:00Z 2026-07-01T00:00:00Z Sectigo [email protected]
Sectigo 'Mammoth2026h2' https://mammoth2026h2.ct.sectigo.com/ Qualified RFC6962 86400 2026-07-01T00:00:00Z 2027-01-01T00:00:00Z Sectigo [email protected]
Sectigo 'Sabre2026h1' https://sabre2026h1.ct.sectigo.com/ Qualified RFC6962 86400 2026-01-01T00:00:00Z 2026-07-01T00:00:00Z Sectigo [email protected]
Sectigo 'Sabre2026h2' https://sabre2026h2.ct.sectigo.com/ Qualified RFC6962 86400 2026-07-01T00:00:00Z 2027-01-01T00:00:00Z Sectigo [email protected]
Let's Encrypt 'Oak2025h1' https://oak.ct.letsencrypt.org/2025h1/ Usable RFC6962 86400 2024-12-20T00:00:00Z 2025-07-20T00:00:00Z Let's Encrypt [email protected]
Let's Encrypt 'Oak2025h2' https://oak.ct.letsencrypt.org/2025h2/ Usable RFC6962 86400 2025-06-20T00:00:00Z 2026-01-20T00:00:00Z Let's Encrypt [email protected]
Let's Encrypt 'Oak2026h1' https://oak.ct.letsencrypt.org/2026h1/ Qualified RFC6962 86400 2025-12-20T00:00:00Z 2026-07-20T00:00:00Z Let's Encrypt [email protected]
Let's Encrypt 'Oak2026h2' https://oak.ct.letsencrypt.org/2026h2/ Qualified RFC6962 86400 2026-06-20T00:00:00Z 2027-01-20T00:00:00Z Let's Encrypt [email protected]
TrustAsia Log2025a https://ct2025-a.trustasia.com/log2025a/ Usable RFC6962 86400 2025-01-01T00:00:00Z 2026-01-01T00:00:00Z TrustAsia [email protected]
TrustAsia Log2025b https://ct2025-b.trustasia.com/log2025b/ Usable RFC6962 86400 2025-01-01T00:00:00Z 2026-01-01T00:00:00Z TrustAsia [email protected]
TrustAsia 'log2026a' https://ct2026-a.trustasia.com/log2026a/ Usable RFC6962 86400 2025-12-24T00:00:00Z 2027-01-08T00:00:00Z TrustAsia [email protected]
TrustAsia 'log2026b' https://ct2026-b.trustasia.com/log2026b/ Usable RFC6962 86400 2025-12-24T00:00:00Z 2027-01-08T00:00:00Z TrustAsia [email protected]