Shodan operates servers worldwide which crawl the internet 24/7 to provide the latest intelligence. This can include information about the server software, what options the service supports, a welcome message, or anything else that the client would like to know before interacting with the server. This is metadata about software that is running on a device. The devices powering the World Wide Web only make up a tiny fraction of internet connections and Shodan aims to provide a complete picture. Shodan queries go far beyond what the traditional web search engines can provide as Shodan crawls the internet - whereas traditional search engines crawl the World Wide Web. The types of devices that are indexed vary tremendously and range from small desktop computers to nuclear power plants, and everything in between. These connected devices are queried for various types of publicly available information. Shodan is a search engine that gathers data from internet-connected devices.
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