Shodan

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Shodan is a web-based search engine that looks for information saved on internet-connected devices.

• allows you to search for specific information
  • particular hardware, software, or open ports

Example

• If you knew of a vulnerable version of a specific File Transfer Protocol (FTP) service, you could ask Shodan for a list of all its instances in its database
• Ask Shodan for everything that it knows about a domain or server and instantly see where specific vulnerabilities might be present