And it would often give you the wrong information. The address->name mappings
in the public DNS database are not required to be the inverses of the
name->address mappings, and often aren't. Moreover, there is no requirement
that every IP address maps to a name. If an address->name lookup yields the
information that there is no such mapping in the public DNS database, then
_that is the case_. Believe it. Stop thinking that there is another,
different, answer to be had somewhere.