Calculation of Link Local Address

fe80 :: 2 [2^nd octet MAC]: [3^rd octet MAC] ff: fe [4^th octet MAC]: [5^th octet MAC] [6^th octet MAC]

Example

MAC:
00: 16:91 : 12:34:56

IPv6:
fe80 :: 216: 91ff: fe12: 3456