Shodan

Shodan is an online search engine that indexes devices and services connected to the internet. It allows users to find exposed IoT devices, webcams, industrial controllers, and network services, including misconfigured or vulnerable systems. Security researchers, network engineers, and attackers alike use Shodan to assess the attack surface of internet-facing assets. Shodan provides filters for geography, port, device type, and software version, enabling precise searches. It also offers APIs and commercial subscriptions for automated monitoring, alerting, and integration with security workflows.