It is sometimes possible to obtain a list of all machines in the DNS belonging to a specific organization by performing a zone transfer.

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A zone transfer is a type of DNS query that can be used to replicate DNS databases across a set of DNS servers. If improperly configured to allow requests from any source, it can be exploited to obtain a list of all the DNS records for a domain, revealing the names of machines within an organization's network.

It Is Sometimes Possible to Obtain a List of All