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github.com

One hostname map per apex domain — certificate transparency and passive DNS from several providers, merged, resolved, scored and kept up to date.

Product

Subdomain search
Explore the index
DNS & TLS utilities
API reference
About us
Account & API keys

Tools

Certificate inspection
Mail authentication
DNS lookup
Security scoring

The dataset records observations, not liveness — a returned hostname is not necessarily resolving today. Use only against domains you are authorised to assess.