68.168.192.17 => 'ns1.a'

##</code><code>##

'68.168.192.17' => ns1.a

##</code><code>##

if ($ours{$_} eq 'ns1.t') {
  print OUT "$_\n";
}
elsif ($theirs{$_} eq 'ns1.a') {
  print OUT1 "$_\n";
}