Passive DNS & Certificates
Explore public-records and open-source research resources, organized by category. Each source lists its jurisdiction, coverage, and access requirements. Some resources require registration or payment. Use each resource according to its terms and applicable access rules.
Passive DNS & Certificates
| Source | Jurisdiction | Coverage | Access |
|---|---|---|---|
| crt.sh Certificate Transparency ↗ | Global | TLS certificate logs and subdomains | Free |
| DNSDumpster ↗ | Global | DNS recon mapping | Free |
| SecurityTrails ↗ | Global | Historical DNS and WHOIS | Freemium |
| VirusTotal ↗ | Global | URL/file/domain reputation, passive DNS | Freemium |