Data Collection

The domains collection is composed of the Alexa top 1 million domains, fetched and resolved daily and then scanned. When scanning, we collect relevant security information about the DNS configuration of the domain, SMTP (and any STARTTLS certificates), and websites (both HTTP and HTTPS).

Table Structure

The domains table is composed of several top-level objects:

  1. p0. DNS information, including AXFR, SPF, and DMARC records.
  2. p25. SMTP information, including STARTTLS information if available.
  3. p80. HTTP information.
  4. p443. HTTPS information, including TLS certificate information.
  5. p465. SMTP information, including STARTTLS information if available.
  6. metadata. Metadata about the inclusion of the record in Censys, including alexa_rank  and device information, if available. 
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