Shodan

Shodan is a search engine that indexes internet-connected devices and systems, including servers, webcams, routers, industrial control systems, and IoT devices. It continuously scans public IP addresses across the internet and catalogs metadata such as open ports, running services, banners, and software versions. Security researchers, penetration testers, and network administrators use it to discover exposed assets, assess attack surfaces, and identify vulnerable or misconfigured devices. The platform offers a web interface, API access, and command-line tools that allow users to query its database, filter results by location, organization, or service type, and integrate findings into other security workflows. Beyond ad hoc searches, it provides monitoring capabilities, vulnerability data tied to specific device fingerprints, and reports that help organizations track their own internet-facing infrastructure over time.