Hexadecimal numbering system

1. Base 16, generally abbreviated as hex, the hexadecimal numbering system uses combinations of 16 character digits to represent all numerical values. In addition to the 10 used in the familiar decimal system (0, 1, 2, 3, 4, 5, 6, 7, 8 and 9), hexadecimal uses the letters A through F to create a hexadecimal number.

Additional information about hexadecimal as well as how to covert it to other formats can be found here.