% ./scandns.pl 209.197.123.153/29
209.197.123.153 is an invalid address.
% 

##</code><code>##

% ./scandns.pl 209.197.123.153/29
209.197.123.152 => renku.org => 4.79.43.173 
209.197.123.153 => perlmonks.pair.com 
209.197.123.154 => taidsaccount.com 
209.197.123.155 => murphyworld.com => 208.91.197.132 
209.197.123.156 => beetz.at 
209.197.123.157 => best-kids-bedding-prices-online.com => best-kids-bedding-prices-online.com has no A record
209.197.123.158 => lowest-prices-for-kids-bedding.com => lowest-prices-for-kids-bedding.com has no A record
209.197.123.159 => no PTR record
%