Shodan is a search engine that lets the user find specific types of computers (webcams, routers, servers, etc.) connected to the internet using a variety of filters. Some have also described it as a search engine of service banners, which are metadata that the server sends back to the client. 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.
Shodan collects data mostly on web servers (HTTP/HTTPS - port 80, 8080, 443, 8443), as well as FTP (port 21), SSH (port 22), Telnet(port 23), SNMP (port 161), IMAP (port 993), SIP (port 5060),and Real Time Streaming Protocol (RTSP, port 554). The latter can be used to access webcams and their video stream.
It was launched in 2009 by computer programmer John Matherly, who, in 2003, conceived the idea of searching devices linked to the Internet. The name Shodan is a reference to SHODAN, a character from the System Shock video game series.
Automated search tools
Bulk searching and processing of SHODAN queries can be performed using SHODAN Diggity (part of SearchDiggity, Bishop Fox's free search engine attack tool suite). The free tool provides an easy-to-use scanning interface to the popular hacking search engine via the SHODAN API.
SHODAN Diggity comes equipped with convenient list of 167 search queries ready in a pre-made dictionary file, known as the SHODAN Hacking Database (SHDB).This dictionary helps target various technologies including webcams, printers, VoIP devices, routers, toasters, switches, and even SCADA/Industrial Control Systems (ICS) to name just a few.
Shodan (Sentient Hyper-Optimised Data Access Network) is a search engine designed to map and gather information about internet-connected devices and systems. Shodan is sometimes referred to as a search engine for the internet of things (IoT). Applications of the software include market research, vulnerability analysis and penetration testing, as well as hacking.
Shodan makes it possible to detect devices that are connected to the internet at any given time, the locations of those devices and their current users. Such devices could be in almost any type of system, including business networks, surveillance cameras, industrial control systems (ICS) and smart homes. Shodan attempts to grab the system’s banner directly, gathering the data by way of the associated server’s ports. Banner grabbing is a key step for penetration testing as it helps identify vulnerable systems. Shodan also searches corresponding exploits in the search platform’s exploit section.
Shodan supports Boolean operators and provides filters to improve the efficiency of searching. The search engine provides 50 results for free and offers paid subscriptions for more extensive results.
John Matherly came up with the idea of searching Internet-connected devices in 2003 and launched Shodan in 2009. It quickly became apparent that hackers could use the tool to find vulnerable systems and that, furthermore, many systems all over the world were readily accessible and inadequately protected from hardware attacks, industrial espionage and sabotage.
Shodan is named for a character from a video game series called System Shock.
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