How to find a MAC ADDRESS?

[John Alexander Sanabria Ordonez]

Hello:

Recently i saw that exist one machine that had used my IP address. The
only thing that i know its mac address.

What command exist to let me know more information releated about who is
used my ip address?

Thanks in advanced. 

John Sanabria
Ingeniero de Sistemas 
Universidad del Valle
Cali, Colombia


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