Hexadecimal digits are used as a shorthand for four binary digits.
Here is a 12 digit hex' number
0x0013205FF91F.
This looks hard but look at the same number in binary.
000000000001001100100000010111111111100100011111.
This is a computer MAC address and it's the kind of information you might need to read out on a telephone help line when your Internet connection is broken. Which type of number would you prefer to read out?
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