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They show screenshots of those systems, which provided the warning banner " DEATH MAY OCCUR !!!" upon connecting. In May 2013, CNN Money released an article detailing how Shodan can be used to find vulnerable systems on the Internet, including traffic light controls. Shodan has since been used to find systems including control systems for water plants, power grids and a cyclotron.

The website began as Matherly's pet project, based on the fact that large numbers of devices and computer systems are connected to the Internet. The name Shodan is a reference to SHODAN, a character from the System Shock video game series. It was launched in 2009 by computer programmer John Matherly, who, in 2003, conceived the idea of searching devices linked to the Internet. The latter can be used to access webcams and their video streams. Shodan collects data mostly on web servers ( HTTP/ HTTPS – ports 80, 8080, 443, 8443), as well as FTP (port 21), SSH (port 22), Telnet (port 23), SNMP (port 161), IMAP (ports 143, or (encrypted) 993), SMTP (port 25), SIP (port 5060), and Real Time Streaming Protocol (RTSP, port 554). This can be information about the server software, what options the service supports, a welcome message or anything else that the client can find out before interacting with the server. Some have also described it as a search engine of service banners, which are metadata that the server sends back to the client.

Shodan is a search engine that lets users search for various types of servers ( webcams, routers, servers, etc.) connected to the internet using a variety of filters. Please help update this article to reflect recent events or newly available information.