Hexadecimal Notation

IPv6 addresses contain both letters and numbers. This format is called hexadecimal (hex for short) notation because it represents a base 16 counting system. This means you count 1 to 16 bits; then increment your units. Each hex digit represents 4 bits, using the letters A to F to supplement the familiar decimal digits 0-9 (see Table 14-1).

From Table 14-1 you should be able to get a much better idea of how hexadecimal notation works, which numbers are represented, and how they fall in sequence.