One way:

use strict;
use warnings;

my $h = 'F23CC481AAE190180000000014000008';
my $bin;
$bin .= sprintf '%04b', hex $_ for split //, $h;
print $bin;

__END__

1111001000111100110001001000000110101010111000011001000000011000000000
+0000000000000000000000000000010100000000000000000000001000
[download]

See also:

• perldoc -q convert
• How do I convert between numeric representations/bases/radixes?