Censys

Censys is an internet scanning and host reconnaissance platform that indexes exposed services, certificates, and infrastructure across the global internet. It provides a web interface, API, and data feeds for security teams to map attack surfaces and investigate threats.

Discovering and monitoring internet-facing assets, certificates, and adversary infrastructure.

• +Internet-wide scan data on hosts, services, domains, and certificates.
• +Continuous scanning that rescans known services older than 24 hours, with historical data and API access.
• +Useful for attack-surface mapping and threat-hunting pivots.

• +Free accounts receive 100 credits per month and cover basic protocols and services only.
• +Paid platform plans are priced through sales rather than published rates.

Identifying unknown internet-exposed assets, expired certificates, and adversary infrastructure during threat hunting.