There is a widespread practice by webmasters and administrators of websites and servers to create specific sub-domains to access hidden areas, administration or database. There is a way to retrieve the list of subdomains of a normal domain, and although it is easily lockable by the site owner, as a rule is enabled. I'm talking about the record AXFR , whose original purpose is to allow the transfer of control from one domain to another or the creation of servers DNS support to the primary. There are many web pages that use the programs that I will describe below, for example Magic-Net , but I want to explain in which they rely to get the information you show us.
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