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  1. or download this
    
  use Socket;
...
  $\ = $/;
  print defined $a ? inet_ntoa($a) : "Can't resolve '$address'";
  2. or download this
    % ./sample_resolver.pl
Usage: ./sample_resolver.pl address
...
% ./sample_resolver.pl 256.0.1
Can't resolve '256.0.1'