The IEEE MAC address is part of the device certificate as a Subject Alternative Name (SAN)
serial number object. The MAC address adheres to the IEEE EUI-48 standard for MAC addresses.
This address is a unique identifier for LAN, WiFi or Bluetooth networks. This value is
programmed into the ATECC608A-TNGTLS during device
provisioning. The MAC address is a 6 byte (48-bit) value. It is stored as ASCII Hex characters
in the first 12 bytes of the data slot.
MAC EUI-48 Example
- 1.The EUI-48 value is represented as 6-bytes of hex separated by a dash.
- 2.The individual hex digits are interpreted as ASCII Characters
- 3.Each of these characters are then translated to their actual ASCII hexadecimal code. So
a 6-byte hexadecimal value will convert to a 12-byte ASCII-Hex value. Note the
conversion between the ASCII character and the ASCII code in both decimal and hexadecimal
are shown in Table 1.
Table 1. Hex ASCII Conversion
| Hex / ASCII Char |
ASCII Code |
|
Hex / ASCII Char |
ASCII Code |
| DEC |
HEX |
DEC |
HEX |
| “0” |
48 |
0x30 |
|
“8” |
56 |
0x38 |
| “1” |
49 |
0x31 |
|
“9” |
57 |
0x39 |
| “2” |
50 |
0x32 |
|
“A” |
65 |
0x41 |
| “3” |
51 |
0x33 |
|
“B” |
66 |
0x42 |
| “4” |
52 |
0x34 |
|
“C” |
67 |
0x43 |
| “5” |
53 |
0x35 |
|
“D” |
68 |
0x44 |
| “6” |
54 |
0x36 |
|
“E” |
69 |
0x45 |
| “7” |
55 |
0x37 |
|
“F” |
70 |
0x46 |
Table 2. MAC EUI-48 Example
(34-C8-CE-AD-21-60)
| |
Byte 0 |
Byte 1 |
Byte 2 |
Byte 3 |
Byte 4 |
Byte 5 |
| ASCII Char |
3 |
4 |
C |
8 |
C |
E |
A |
D |
2 |
1 |
6 |
0 |
| ASCII Code(DEC)(1) |
51 |
52 |
67 |
56 |
67 |
69 |
65 |
68 |
50 |
49 |
54 |
48 |
| ASCII Code(HEX)(1) |
33 |
34 |
43 |
38 |
43 |
45 |
41 |
44 |
32 |
31 |
36 |
30 |
Note: (1) This is the actual 12-byte value
stored in the data slot that represents the MAC IEEE EUI-48 Identifier.