It is not clear what you are trying to achieve.

Your code shows attempts to explicitly specify domain name servers. Some issues that leave your approach and objectives hazy are:

• You explicitly specify Name SERVERS, not domain names. This is OK, if all you want are PTR records.
• 'wrnadc02.na.alarismed.com' does not seem to exist. In fact the "na" subdomain does not seem to exist
• "alarismed.com" seems to have the same name server(s) as "pyxis.com", so the reason for specifying different Name servers is not clear.
• You are re-creating a new $res object for each query.

If your "sub nsqry" works as you expect, the only change necessary is to "return $rr->ptrdname" after (or instead of) printing it.On failure, "return undef".

You can also use a modified example from the Net::DNS docs:

sub new-nsqry{
  my ($res, $IP) = @_;  # Note: $res is created OUTSIDE the sub ...
 
  my $query = $res->query($IP, "PTR");
  
  if ($query) {
      foreach $rr (grep { $_->type eq 'PTR' } $query->answer) {
          print $rr->ptrdname, " : $IP\n";
          return $rr->ptrdname;
      }
      return undef;
  }
  else {
      warn "query failed for $IP: ", $res->errorstring, "\n";
      return undef;
  }
}
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