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10.0.1.252
10.0.1.253
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10.0.2.3
10.0.2.4
10.0.2.5

sub ip_fr_dotted { unpack 'N', pack 'C4', split /\./, $_[0] }
sub ip_to_dotted { join '.', unpack 'C4', pack 'N', $_[0] }
...
for (my $ip=$start; $ip<=$end; $ip++) {
   print(ip_to_dotted($ip), "\n");
}