my $mask = 0x06000003; # or whatever

my $val = $mask;
for (;;) {
  #printf("0x%08X\n", $val);        # Print big to small.
   printf("0x%08X\n", $mask-$val);  # Print small to big.
   last if not $val;
   $val = ($val - 1) & $mask;
}