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  1. or download this
    open(F,'C:\Temp\ipconfig.txt') || die "error($!)";
while(<F>)
...
my $fk="$ff:255.255.255.0";
$block4 = new2 Net::Netmask($fk);
print $block4->size();
  2. or download this
    my $ff="10.6.10.5"; 
my $fk="$ff:255.255.255.0";
$block4 = new2 Net::Netmask($fk);
print $block4->size();