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Table of Contents

Known Logs

The list of CT Logs that are currently compliant with Chrome's CT policy (or have been and were disqualified), and are included in Chrome: https://www.gstatic.com/ct/log_list/v3/log_list.json

The list of all known and announced CT Logs: https://www.gstatic.com/ct/log_list/v3/all_logs_list.json

log_list.json and all_logs_list.json are signed by Google, the signatures being hosted at: https://www.gstatic.com/ct/log_list/v3/log_list.sig and https://www.gstatic.com/ct/log_list/v3/all_logs_list.sig respectively.

log_list.json and the corresponding log_list.sig can also be obtained by downloading the zip file containing both of them, found at: https://www.gstatic.com/ct/log_list/v3/log_list.zip

Similarly, all_logs_list.json and the corresponding all_logs_list.sig can be obtained by downloading the zip file containing both of them, found at: https://www.gstatic.com/ct/log_list/v3/all_logs_list.zip

The public key to verify log_list.sig and all_logs_list.sig can be found at: https://www.gstatic.com/ct/log_list/v3/log_list_pubkey.pem

Both log_list.json and all_logs_list.json conform with the following schema: https://www.gstatic.com/ct/log_list/v3/log_list_schema.json

To check whether Logs are currently pending inclusion in Chrome, check the Chromium inclusion bugs: https://crbug.com/?q=component%3AInternals>Network>CertTrans

Special Purpose Logs

https://ct.googleapis.com/daedalus/
Base64 Log ID: HQJLjrFJizRN/YfqPvwJlvdQbyNdHUlwYaR3PEOcJfs=
Operator: Google
Contact: google-ct-logs@googlegroups.com

Daedalus is not trusted by Chrome. It only logs certificates that have expired. See the announcement post.

https://ct.googleapis.com/submariner/
Base64 Log ID: qJnYeAySkKr0YvMYgMz71SRR6XDQ+/WR73Ww2ZtkVoE=
Operator: Google
Contact: google-ct-logs@googlegroups.com

Submariner is not trusted by Chrome. It only logs certificates that chain to roots that are on track for inclusion in browser roots or were trusted at some previous point announcement blog post.

Mirrors

These logs are hosted by Google and mirror the logs served at Source URL. These mirrors run with no SLA.

https://ct.googleapis.com/logs/eu1/mirrors/letsencrypt_oak2023/
Source URL: https://oak.ct.letsencrypt.org/2023/
Base64 Log ID: tz77JN+cTbp18jnFulj0bF38Qs96nzXEnh0JgSXttJk=
Operator: Let’s Encrypt
Contact: sre@letsencrypt.org

https://ct.googleapis.com/logs/eu1/mirrors/letsencrypt_oak2022/
Source URL: https://oak.ct.letsencrypt.org/2022/
Base64 Log ID: 36Veq2iCTx9sre64X04+WurNohKkal6OOxLAIERcKnM=
Operator: Let’s Encrypt
Contact: sre@letsencrypt.org

https://ct.googleapis.com/logs/eu1/mirrors/digicert_yeti2022_2/
Source URL: https://yeti2022-2.ct.digicert.com/log/
Base64 Log ID: BZwB0yDgB4QTlYBJjRF8kDJmr69yULWvO0akPhGEDUo=
Operator: DigiCert
Contact: ctops@digicert.com

https://ct.googleapis.com/logs/eu1/mirrors/digicert_yeti2023/
Source URL: https://yeti2023.ct.digicert.com/log/
Base64 Log ID: Nc8ZG7+xbFe/D61MbULLu7YnICZR6j/hKu+oA8M71kw=
Operator: DigiCert
Contact: ctops@digicert.com

https://ct.googleapis.com/logs/us1/mirrors/digicert_nessie2022/
Source URL: https://nessie2022.ct.digicert.com/log/
Base64 Log ID: UaOw9f0BeZxWbbg3eI8MpHrMGyfL956IQpoN/tSLBeU=
Operator: DigiCert
Contact: ctops@digicert.com

https://ct.googleapis.com/logs/us1/mirrors/digicert_nessie2023/
Source URL: https://nessie2023.ct.digicert.com/log/
Base64 Log ID: s3N3B+GEUPhjhtYFqdwRCUp5LbFnDAuH3PADDnk2pZo=
Operator: DigiCert
Contact: ctops@digicert.com

https://ct.googleapis.com/logs/us1/mirrors/cloudflare_nimbus2022/
Source URL: https://ct.cloudflare.com/logs/nimbus2022/
Base64 Log ID: QcjKsd8iRkoQxqE6CUKHXk4xixsD6+tLx2jwkGKWBvY=
Operator: Cloudflare
Contact: ct-logs@cloudflare.com

https://ct.googleapis.com/logs/us1/mirrors/cloudflare_nimbus2023/
Source URL: https://ct.cloudflare.com/logs/nimbus2023/
Base64 Log ID: ejKMVNi3LbYg6jjgUh7phBZwMhOFTTvSK8E6V6NS61I=
Operator: Cloudflare
Contact: ct-logs@cloudflare.com

https://ct.googleapis.com/logs/us1/mirrors/cloudflare_nimbus2024/
Source URL: https://ct.cloudflare.com/logs/nimbus2024/
Base64 Log ID: 2ra/az+1tiKfm8K7XGvocJFxbLtRhIU0vaQ9MEjX+6s=
Operator: Cloudflare
Contact: ct-logs@cloudflare.com

https://ct.googleapis.com/logs/us1/mirrors/cloudflare_nimbus2025/
Source URL: https://ct.cloudflare.com/logs/nimbus2025/
Base64 Log ID: zPsPaoVxCWX+lZtTzumyfCLphVwNl422qX5UwP5MDbA=
Operator: Cloudflare
Contact: ct-logs@cloudflare.com

https://ct.googleapis.com/logs/us1/mirrors/comodo_mammoth/
Source URL: https://mammoth.ct.comodo.com/
Base64 Log ID: b1N2rDHwMRnYmQCkURX/dxUcEdkCwQApBo2yCJo32RM=
Operator: Sectigo
Contact: ctops@sectigo.com

https://ct.googleapis.com/logs/us1/mirrors/comodo_sabre/
Source URL: https://sabre.ct.comodo.com/
Base64 Log ID: VYHUwhaQNgFK6gubVzxT8MDkOHhwJQgXL6OqHQcT0ww=
Operator: Sectigo
Contact: ctops@sectigo.com

Test Logs

These logs are intended for testing purposes only and will only log certificates that chain to a test root explicitly added to it.

To add a test root to the Google test Logs, please email google-ct-logs@googlegroups.com

A test root should:

  1. have a certificate Subject field that:

    a) includes the word test, dev, demo or staging (to reduce the chance of real certificates being mixed up with test certificates).

    b) identifies the organization that the test root is for (to allow easy classification of test traffic).

  2. not allow real certificates to chain to it, either because:

    a) it is a self-signed root CA certificate identified as a test certificate (as above).

    b) it is an intermediate CA certificate that chains to a root certificate that is also identified as a test certificate.

  3. be a CA certificate, by:

    a) having CA:TRUE in the Basic Constraints extension.

    b) include the 'Certificate Sign' bit in the Key Usage extension.

  4. be in PEM format (with a .cer or .pem extension).

For historical reasons, Google's test logs include some test roots that do not comply with all of the above requirements.

Google's test Logs are:

https://ct.googleapis.com/logs/crucible/
Base64 Log ID: w78Dp+HKiEHGB7rj/0Jw/KXsRbGG675OLPP8d4Yw9fY=
Operator: Google
Contact: google-ct-logs@googlegroups.com

https://ct.googleapis.com/logs/solera2018/
Base64 Log ID: UutLIl7IlpdIUGdfI+Q7wdAh4yFM5S7NX6h8IDzfygM=
Expiry range: Jan 01 2018 00:00:00Z inclusive to Jan 01 2019 00:00:00Z exclusive
Operator: Google
Contact: google-ct-logs@googlegroups.com

https://ct.googleapis.com/logs/solera2019/
Base64 Log ID: C3YOmouaaC+ImFsV6UdQGlZEa7qIMHhcOEKZQ4ZFDAA=
Expiry range: Jan 01 2019 00:00:00Z inclusive to Jan 01 2020 00:00:00Z exclusive
Operator: Google
Contact: google-ct-logs@googlegroups.com

https://ct.googleapis.com/logs/solera2020/
Base64 Log ID: H8cs5aG3mfQAw1m/+WyjkTVI6GRCIGEJUum6F3T3usc=
Expiry range: Jan 01 2020 00:00:00Z inclusive to Jan 01 2021 00:00:00Z exclusive
Operator: Google
Contact: google-ct-logs@googlegroups.com

https://ct.googleapis.com/logs/solera2021/
Base64 Log ID: o8mYRegKt84AFXs3Qt8CB90nKytgLs+Y7iwS25xa5+c=
Expiry range: Jan 01 2021 00:00:00Z inclusive to Jan 01 2022 00:00:00Z exclusive
Operator: Google
Contact: google-ct-logs@googlegroups.com

https://ct.googleapis.com/logs/solera2022/
Base64 Log ID: aXqvyhprU2+uISBQRt661+Dq6hPSQy5unY+zefK5qvM=
Expiry range: Jan 01 2022 00:00:00Z inclusive to Jan 01 2023 00:00:00Z exclusive
Operator: Google
Contact: google-ct-logs@googlegroups.com

https://ct.googleapis.com/logs/solera2023/
Base64 Log ID: +X6XuNM+96FZAqU6GeF5kOXcQGoDGCW6rZPpj5ucacs=
Expiry range: Jan 01 2023 00:00:00Z inclusive to Jan 01 2024 00:00:00Z exclusive
Operator: Google
Contact: google-ct-logs@googlegroups.com

https://ct.googleapis.com/logs/eu1/solera2024/
Base64 Log ID: MCTOfusWiGJyS+pwLv/5ks/kVkNBkapZWyX4AibIABc=
Expiry range: Jan 01 2024 00:00:00Z inclusive to Jan 01 2025 00:00:00Z exclusive
Operator: Google
Contact: google-ct-logs@googlegroups.com

https://ct.googleapis.com/logs/eu1/solera2025h1/
Base64 Log ID: P+HLRu1HNXmvAUH5ck2dxENHLXVuhedxnFWCSF3U4eQ=
Expiry range: Jan 01 2025 00:00:00Z inclusive to Jul 01 2025 00:00:00Z exclusive
Operator: Google
Contact: google-ct-logs@googlegroups.com

https://ct.googleapis.com/logs/eu1/solera2025h2/
Base64 Log ID: JgI5SIdM9/zQ+2RxpD6EfrsgCubi+iQjbfbRpgZjD7E=
Expiry range: Jul 01 2025 00:00:00Z inclusive to Jan 01 2026 00:00:00Z exclusive
Operator: Google
Contact: google-ct-logs@googlegroups.com

https://ct.googleapis.com/testtube/
Base64 Log ID: sMyD5aX5fWuvfAnMKEkEhyrH6IsTLGNQt8b9JuFsbHc=
Operator: Google
Contact: google-ct-logs@googlegroups.com