How to find MAC address

[uday kumar kunta <udaykumar_kunta () yahoo com>]

Hi all,
   
   I am not able to get the MAC address if the IP address is not in the same class.
  Can you please tell me the Nmap Option which finds the MAC for any IP address.
   
  For example: I using the IP 171.11.22.35(My system)
  $nmap -O 171.11.22.0-255    => It is showing the MAC addresses resp.
  But when i am running nmap for other series of IP it is not showing the MAC.
  $nmap -O 171.11.25.0-255  =>It is not showing the MAC details.
   
  Please help me.
   
  Regards,
  Uday.

                
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