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DomainLens is independent and free to use. Servers and data providers are funded out of pocket. If it's useful to you, a small contribution helps keep it running. Support DomainLens

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stripe.com

DomainLens

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

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