use CGI;
use Net::Whois::ARIN;
use Regexp::Common qw /net/;


my $w = Net::Whois::ARIN->new(
host    => 'whois.arin.net',
port    => 43,
timeout => 30,
);

print "content-type:text/html; charset=utf-8\n\n";
print $head;
my $q = new CGI;
my $ip = $q->param('ip');
if (!$ip){print $formm;
}else{
my @records = $w->network($ip=~ /^$RE{net}{IPv4}$/);
foreach my $net (@records)  {

# print ...;
  }
}