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 | MMD | Temporal Interval Start | Temporal Interval End | Log Operator | Contact Info |
|---|---|---|---|---|---|---|---|
| Google 'Argon2024' log | https://ct.googleapis.com/logs/us1/argon2024/ | Usable | 86400 | 2024-01-01T00:00:00Z | 2025-01-01T00:00:00Z | [email protected] | |
| Google 'Argon2025h1' log | https://ct.googleapis.com/logs/us1/argon2025h1/ | Usable | 86400 | 2025-01-01T00:00:00Z | 2025-07-01T00:00:00Z | [email protected] | |
| Google 'Argon2025h2' log | https://ct.googleapis.com/logs/us1/argon2025h2/ | Usable | 86400 | 2025-07-01T00:00:00Z | 2026-01-01T00:00:00Z | [email protected] | |
| Google 'Argon2026h1' log | https://ct.googleapis.com/logs/us1/argon2026h1/ | Usable | 86400 | 2026-01-01T00:00:00Z | 2026-07-01T00:00:00Z | [email protected] | |
| Google 'Argon2026h2' log | https://ct.googleapis.com/logs/us1/argon2026h2/ | Usable | 86400 | 2026-07-01T00:00:00Z | 2027-01-01T00:00:00Z | [email protected] | |
| Google 'Xenon2024' log | https://ct.googleapis.com/logs/eu1/xenon2024/ | Usable | 86400 | 2024-01-01T00:00:00Z | 2025-01-01T00:00:00Z | [email protected] | |
| Google 'Xenon2025h1' log | https://ct.googleapis.com/logs/eu1/xenon2025h1/ | Usable | 86400 | 2025-01-01T00:00:00Z | 2025-07-01T00:00:00Z | [email protected] | |
| Google 'Xenon2025h2' log | https://ct.googleapis.com/logs/eu1/xenon2025h2/ | Usable | 86400 | 2025-07-01T00:00:00Z | 2026-01-01T00:00:00Z | [email protected] | |
| Google 'Xenon2026h1' log | https://ct.googleapis.com/logs/eu1/xenon2026h1/ | Usable | 86400 | 2026-01-01T00:00:00Z | 2026-07-01T00:00:00Z | [email protected] | |
| Google 'Xenon2026h2' log | https://ct.googleapis.com/logs/eu1/xenon2026h2/ | Usable | 86400 | 2026-07-01T00:00:00Z | 2027-01-01T00:00:00Z | [email protected] | |
| Cloudflare 'Nimbus2024' Log | https://ct.cloudflare.com/logs/nimbus2024/ | Usable | 86400 | 2024-01-01T00:00:00Z | 2025-01-01T00:00:00Z | Cloudflare | [email protected] |
| Cloudflare 'Nimbus2025' | https://ct.cloudflare.com/logs/nimbus2025/ | Usable | 86400 | 2025-01-01T00:00:00Z | 2026-01-01T00:00:00Z | Cloudflare | [email protected] |
| Cloudflare 'Nimbus2026' | https://ct.cloudflare.com/logs/nimbus2026/ | Qualified | 86400 | 2026-01-01T00:00:00Z | 2027-01-01T00:00:00Z | Cloudflare | [email protected] |
| DigiCert Yeti2024 Log | https://yeti2024.ct.digicert.com/log/ | Usable | 86400 | 2024-01-01T00:00:00Z | 2025-01-01T00:00:00Z | DigiCert | [email protected] |
| DigiCert Yeti2025 Log | https://yeti2025.ct.digicert.com/log/ | Usable | 86400 | 2025-01-01T00:00:00Z | 2026-01-01T00:00:00Z | DigiCert | [email protected] |
| DigiCert Nessie2024 Log | https://nessie2024.ct.digicert.com/log/ | Retired | 86400 | 2024-01-01T00:00:00Z | 2025-01-01T00:00:00Z | DigiCert | [email protected] |
| DigiCert Nessie2025 Log | https://nessie2025.ct.digicert.com/log/ | Usable | 86400 | 2025-01-01T00:00:00Z | 2026-01-01T00:00:00Z | DigiCert | [email protected] |
| DigiCert 'Wyvern2024h2' Log | https://wyvern.ct.digicert.com/2024h2/ | Usable | 86400 | 2024-07-01T00:00:00Z | 2025-01-07T00:00:00Z | DigiCert | [email protected] |
| DigiCert 'Wyvern2025h1' Log | https://wyvern.ct.digicert.com/2025h1/ | Usable | 86400 | 2025-01-01T00:00:00Z | 2025-07-07T00:00:00Z | DigiCert | [email protected] |
| DigiCert 'Wyvern2025h2' Log | https://wyvern.ct.digicert.com/2025h2/ | Usable | 86400 | 2025-07-01T00:00:00Z | 2026-01-07T00:00:00Z | DigiCert | [email protected] |
| DigiCert 'Wyvern2026h1' | https://wyvern.ct.digicert.com/2026h1/ | Qualified | 86400 | 2026-01-01T00:00:00Z | 2026-07-01T00:00:00Z | DigiCert | [email protected] |
| DigiCert 'Wyvern2026h2' | https://wyvern.ct.digicert.com/2026h2/ | Qualified | 86400 | 2026-07-01T00:00:00Z | 2027-01-01T00:00:00Z | DigiCert | [email protected] |
| DigiCert 'Sphinx2024h2' Log | https://sphinx.ct.digicert.com/2024h2/ | Usable | 86400 | 2024-07-01T00:00:00Z | 2025-01-07T00:00:00Z | DigiCert | [email protected] |
| DigiCert 'Sphinx2025h1' Log | https://sphinx.ct.digicert.com/2025h1/ | Usable | 86400 | 2025-01-01T00:00:00Z | 2025-07-07T00:00:00Z | DigiCert | [email protected] |
| DigiCert 'Sphinx2025h2' Log | https://sphinx.ct.digicert.com/2025h2/ | Usable | 86400 | 2025-07-01T00:00:00Z | 2026-01-07T00:00:00Z | DigiCert | [email protected] |
| DigiCert 'Sphinx2026h1' | https://sphinx.ct.digicert.com/2026h1/ | Qualified | 86400 | 2026-01-01T00:00:00Z | 2026-07-01T00:00:00Z | DigiCert | [email protected] |
| DigiCert 'Sphinx2026h2' | https://sphinx.ct.digicert.com/2026h2/ | Qualified | 86400 | 2026-07-01T00:00:00Z | 2027-01-01T00:00:00Z | DigiCert | [email protected] |
| Sectigo 'Sabre' CT log | https://sabre.ct.comodo.com/ | ReadOnly | 86400 | Sectigo | [email protected] | ||
| Sectigo 'Sabre2024h2' | https://sabre2024h2.ct.sectigo.com/ | Usable | 86400 | 2024-07-01T00:00:00Z | 2025-01-01T00:00:00Z | Sectigo | [email protected] |
| Sectigo 'Sabre2025h1' | https://sabre2025h1.ct.sectigo.com/ | Usable | 86400 | 2025-01-01T00:00:00Z | 2025-07-01T00:00:00Z | Sectigo | [email protected] |
| Sectigo 'Sabre2025h2' | https://sabre2025h2.ct.sectigo.com/ | Usable | 86400 | 2025-07-01T00:00:00Z | 2026-01-01T00:00:00Z | Sectigo | [email protected] |
| Sectigo 'Mammoth2024h2' | https://mammoth2024h2.ct.sectigo.com/ | Usable | 86400 | 2024-07-01T00:00:00Z | 2025-01-01T00:00:00Z | Sectigo | [email protected] |
| Sectigo 'Mammoth2025h1' | https://mammoth2025h1.ct.sectigo.com/ | Usable | 86400 | 2025-01-01T00:00:00Z | 2025-07-01T00:00:00Z | Sectigo | [email protected] |
| Sectigo 'Mammoth2025h2' | https://mammoth2025h2.ct.sectigo.com/ | Usable | 86400 | 2025-07-01T00:00:00Z | 2026-01-01T00:00:00Z | Sectigo | [email protected] |
| Sectigo 'Mammoth2026h1' | https://mammoth2026h1.ct.sectigo.com/ | Qualified | 86400 | 2026-01-01T00:00:00Z | 2026-07-01T00:00:00Z | Sectigo | [email protected] |
| Sectigo 'Mammoth2026h2' | https://mammoth2026h2.ct.sectigo.com/ | Qualified | 86400 | 2026-07-01T00:00:00Z | 2027-01-01T00:00:00Z | Sectigo | [email protected] |
| Sectigo 'Sabre2026h1' | https://sabre2026h1.ct.sectigo.com/ | Qualified | 86400 | 2026-01-01T00:00:00Z | 2026-07-01T00:00:00Z | Sectigo | [email protected] |
| Sectigo 'Sabre2026h2' | https://sabre2026h2.ct.sectigo.com/ | Qualified | 86400 | 2026-07-01T00:00:00Z | 2027-01-01T00:00:00Z | Sectigo | [email protected] |
| Let's Encrypt 'Oak2024H2' log | https://oak.ct.letsencrypt.org/2024h2/ | Usable | 86400 | 2024-06-20T00:00:00Z | 2025-01-20T00:00:00Z | Let's Encrypt | [email protected] |
| Let's Encrypt 'Oak2025h1' | https://oak.ct.letsencrypt.org/2025h1/ | Usable | 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 | 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 | 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 | 86400 | 2026-06-20T00:00:00Z | 2027-01-20T00:00:00Z | Let's Encrypt | [email protected] |
| Trust Asia Log2024-2 | https://ct2024.trustasia.com/log2024/ | Usable | 86400 | 2024-01-01T00:00:00Z | 2025-01-01T00:00:00Z | TrustAsia | [email protected] |
| TrustAsia Log2025a | https://ct2025-a.trustasia.com/log2025a/ | Usable | 86400 | 2025-01-01T00:00:00Z | 2026-01-01T00:00:00Z | TrustAsia | [email protected] |
| TrustAsia Log2025b | https://ct2025-b.trustasia.com/log2025b/ | Usable | 86400 | 2025-01-01T00:00:00Z | 2026-01-01T00:00:00Z | TrustAsia | [email protected] |
| TrustAsia 'log2026a' | https://ct2026-a.trustasia.com/log2026a/ | Usable | 86400 | 2025-12-24T00:00:00Z | 2027-01-08T00:00:00Z | TrustAsia | [email protected] |
| TrustAsia 'log2026b' | https://ct2026-b.trustasia.com/log2026b/ | Usable | 86400 | 2025-12-24T00:00:00Z | 2027-01-08T00:00:00Z | TrustAsia | [email protected] |