For 10 points, name this base 16 numeral system.
This is the most commonly used system in which there are no cyclic numbers. Vim is distributed with xxd so it can work with files in this system. The smallest unit of this system is equivalent to a "nibble". The printf format "percent a" prints a floating-point number in this system. This system is identifiable by the prefix zero x. Eight groups of four numbers in this system are used to represent an IPv6 address. A "dump" in this system is commonly assessed when debugging. Because each digit in this system maps to four bits, it is more readable than, and very easy to convert to and from, binary. This system uses the digits 0 through 9 and A through F. For 10 points, name this base 16 numeral system.
This is the most commonly used system in which there are no cyclic numbers.
hexadecimal [or base 16 until it is read]