Show HN: Certificate Transparency search that groups related certificates

Overview

CertObserver's Certificate Transparency (CT) search tool allows users to explore CT logs and intelligently group related certificates by issuer, domain, or cryptographic parameters. This aids security researchers, DevOps teams, and penetration testers in understanding certificate issuance patterns, identifying misissuance, and tracking certificate chains. The web interface provides a straightforward way to query logs and visualize relationships between certificates.

Category: AI ChatbotsPricing: Check official siteRating: ★ 4.2Best for: Security researchers and DevOps teams monitoring certificate issuance

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Key Features

  • Search Certificate Transparency logs by domain, issuer, or serial number
  • Group related certificates using similarity heuristics
  • View certificate details and chain information
  • Filter results by time range and issuance events
  • Export search results

Pros

  • Helps identify certificate chains and potential misissuance
  • Free to use with no registration required
  • Intelligent grouping reduces manual analysis effort
  • Useful for security audits and incident response

Cons

  • Limited documentation on grouping algorithms
  • UI may be basic compared to commercial alternatives
  • No API access mentioned
  • Search performance may vary with large datasets

Who Is This Tool Best For?

Security researchers and DevOps teams monitoring certificate issuance