Shodanhq is a computer program designed to help someone find the files that are stored in a computer, for example, in a public server on the web (WWW) or the computer itself. The search engine allows us to ask for media content with specific criteria (typically those containing a word or phrase that you specify) and obtain a list of files that meet these criteria. Search engines usually use the index (which was made before and updated on a regular basis) to locate the file after the user enters search criteria. (Http://id.wikipedia.org / wiki
search engines like google, bing, yahoo and others is an excellent search engine for finding websites, but if we want to find a computer that is running softwere (like apache) or want to know which version of IIS is the most popular, or would like to know how much FTP servers can be logged as a nonymous, or may also want mengathui vulnerability is new and we want to know how many are still using the type / types affected by these vulnerabilities, the search engine standard (traditional) will not answer those questions.
most of the data in the grab of the "banner" is a meta-data information from a server that is sent back to the client (such as HTTP HEADER) may contain information inforamsi server software support services, or a form of data messages sent to the client before berintraksi with server, for example, a message stating that the ftp server is ready to run
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