Threat Investigation

crt.sh

High Traffic Tranco #60,738

crt.sh operates primarily as a search engine, focusing on ssl certificate search. crt.sh is a specialized search engine that allows users to query and view SSL/TLS certificates issued for domains. It is a primary tool for security researchers and administrators to monitor certificate transparency logs. It is operated by Sectigo, a subsidiary of Sectigo.

SSLTLSCertificate TransparencyCybersecurity
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GET /api/v1/classify?domain=crt.sh
{
  "domain": "crt.sh",
  "confidence": "high",
  "category": {
    "purpose": "search_engine",
    "specialization": "SSL Certificate Search"
  },
  "identity": {
    "headline": "Certificate Transparency log search engine",
    "summary": "crt.sh is a specialized search engine that allows users to query and view SSL/TLS certificates issued for domains. It is a primary tool for security researchers and administrators to monitor certificate transparency logs.",
    "operator": "Sectigo",
    "parent_entity": "Sectigo",
    "topics": [
      "SSL",
      "TLS",
      "Certificate Transparency",
      "Cybersecurity",
      "Domain Security"
    ]
  },
  "functions": {
    "is_ugc_platform": false,
    "is_file_host": false,
    "is_url_shortener": false,
    "is_public_idp": false,
    "is_crypto_platform": false,
    "allows_user_subdomains": false,
    "is_form_builder": false,
    "is_document_host": false
  },
  "facts": {
    "registered_date": "2015-05-14T16:54:28Z",
    "rank": 60738,
    "hosting_provider": "Sectigo Sectigo Limited"
  }
}

Hosting

Sectigo Sectigo Limited

Registered

May 14, 2015

Last Updated

Mar 15, 2026

Domain data sourced from WHOIS, Tranco rankings, and URLert's classification engine.