Question: what is a hex number?
Answer: Hexadecimal (or hex) is a base 16 system used to simplify how binary is represented. A hex digit can be any of the following 16 digits: 0 1 2 3 4 5 6 7 8 9 A B C D E F. ... This means an 8-bit binary number can be written using only two different hex digits - one hex digit for each nibble (or group of 4-bits).