IN THE FIELD GUIDE
ctlogs
ctlogs.io
CTlogs.io is a web service and API platform that indexes public Certificate Transparency logs to allow users to search TLS/SSL certificate records by exact hostname or SHA-256 fingerprint. It provides fast, structured queries over billions of certificate records, showing certificate issuers, validity, and live checks of certificates served by hosts.
THE PRODUCT, BEYOND THE PITCH
Automatically researched · Not editorially reviewed · Sources checked Sep 10, 2026
A good fit for
- Security teams and researchers needing to monitor and investigate TLS/SSL certificates for domains and hosts.
Know the limitations
- Searches focus on currently valid certificates by default; historical and expired certificates are retained but not shown by default.
- The service does not provide subdomain or keyword searches; those are offered by a separate service called DomainKits.
What you can do
- Security teams use CTlogs to detect which certificates exist for a hostname, identify issuing authorities, and verify if a certificate seen in the wild matches the logged record.
- Detect misissued or fraudulent certificates quickly by auditing public Certificate Transparency logs.
Features
- Provides a public API with authentication, rate limits, and endpoints for certificate queries, stats, and account info.
Integrations
- MCP connector for AI tools to integrate certificate queries into workflows.
Platforms & data export
- Web-based search interface and REST API accessible over HTTPS.
- Export selected certificate records as CSV files.
THE COST FOR YOUR TEAM
Go beyond the starting price.
Published plan prices for your team size and usage. Results update as you type. Taxes, currency conversion and unlisted add-ons are excluded, and anything the source did not state is called out rather than guessed.
Known monthly subtotal
$0.00/month
1 of 1 tools could not be priced with these inputs, so this is not the full cost.
| Tool / plan | Monthly | Per year | What this assumes |
|---|---|---|---|
| No pricing recorded yet. Check the official site, or ask the owner to add it. | |||
Alternatives to explore
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