my @range = map { unpack "L", pack "C4", split /\./ } qw(10.0.0.0 10.1
+.0.0);
print "@range\n"; # the numbers themselves
print $range[1]-$range[0]+1, "\n"; # how many addresses
for ($range[0]..$range[1]) {
  print join(".", unpack "C4", pack "N", $_), "\n";
}
[download]

When i do the above it reverses the input to 0.0.0.10 -> 0.0.1.10 I can fix this up I guess, but why is it doing that?

Am I using the wrong unpack data type?

After some stuffing around I came up with a solution:

The large integers are never a problem until the 'for' loop, so I just used the ACTUAL host count instead of the numbers representing each address, then added the original address representation that was subtracted when it is joined.

I have limited the width of the range regardless because what I am doing with the IPs is fruitless when there are more than 1 million. So BigInt is useless anyway.

my @range = map { unpack "N", pack "C4", split /\./ } $ARGV[0], $ARGV[
+1];
for (0..$range[1]-$range[0]) {
  print join(".", unpack "C4", pack "N", $_+$range[0]), "\n";
}
[download]

I can't fault the code now, does exactly what I want in every case.

Thanks.