Need help with converting IP address to MAC address

[Sisqo]

Cisco press book (BCMSN) does not really explain well the concept.  I was
wondering if someone can help me break the barrier.

Example in the book:

224.163.163.45 = 01-00-5E-23-A3-2D

I thought 163=A3, why is the 2nd octet converted to 23?

Any help this would be appreciated.  Thanks


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