People have suggested ways of working with numbers. I think it's faster to work with strings in this case (because it reduces greatly the number of calls to sprintf):

my @bytes = map { sprintf('%02X', $_) } 0..255;

foreach my $i (@bytes) {
foreach my $j (@bytes) {
foreach my $k (@bytes) {
foreach my $l (@bytes) {
foreach my $m (@bytes) {
foreach my $n (@bytes) {
   print("$i$j$k$l$m$n\n");
}}}}}}

[download]

Or you could use NestedLoops in Algorithm::Loops:

use Algorithm::Loops qw( NestedLoops );

my @bytes = map { sprintf('%02X', $_) } 0..255;

my $num_bytes = 6;

NestedLoops(
   [ ( [ @bytes ] ) x $bytes ],
   sub {
      print(join('', @_), "\n");
   }
);

[download]

In reply to Re: Very Large Hex Combinations by ikegami
in thread Very Large Hex Combinations by danambroseUK

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