in reply to Hexadecimal to binary

my $bin = pack("H*", "F23CC481AAE190180000000014000008"); # + $bin is a 16-byte/128-bit value

Or. visualized as an ASCII bitstring:

print unpack("B*", pack("H*", "F23CC481AAE190180000000014000008")); # + "1111001000111100110..."