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Application & OT Security · Intermediate

Censys

An internet-wide scanning and search platform for hosts, services and certificates.

Definition

Censys scans the IPv4 space and indexes services and TLS certificates, providing structured data for attack surface discovery. It is similar to Shodan but with strong certificate search capabilities. Defenders also use it for external attack surface management.

Example

Searching Censys for certificates with example.com in the subject to find unknown hosts.

Exam tip

Treat Censys as a Shodan alternative for passive host and certificate discovery.

Related terms