●The standard (IEEE 802) format for printing （72） in human-friendly form. is six groups of two hexadecimal digits, separated by hyphens (-) or colons (:), in transmission order, e.g. 01-23-45-67-89-ab, 01:23:45:67:89:ab. This form is also commonly used for EUI-64.（72）
- A hard disk logical block address
- B IP address
- C mail address
- D MAC address