Censys
censys.io
Provides a search engine and platform for discovering and analyzing Internet-connected hosts, services, certificates, and infrastructure for security operations and attack surface management.
The Censys API has freemium pricing; offers a free tier (Free account available for basic visibility into standard ports and services). Verified 2026-07-12 with per-field source links.
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Individual plan starts at $100 (credit-based); Security Operations and Threat Hunting plans are custom pricing (contact sales); free account also available
censys.com ↗Rate limits
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