Why Passive DNS Matters
Live DNS records only show a domain's current configuration. Passive DNS databases capture historical resolution data collected independently over time by third-party monitoring infrastructure, making it possible to establish what IP addresses, name servers, and mail servers a domain pointed to on a specific past date, even long after those records have changed.
Building a DNS Change Timeline
A DNS change-history report lays out every material change — name server migrations, A/AAAA record changes, MX record changes — against precise dates, then correlates that timeline with content and ownership changes from other sources to determine whether the technical and factual timelines actually line up.
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