This may have already been mentioned, but I'll mention it again:

C:\> arp -a <ip-address> (Windows)

or

$ /sbin/arp <ip-address> (Linux)

will give you the MAC address of the specified IP address. You will need to parse the output if you are using this in a script, but the third field (HWaddress) is the one you want to look at.

update: arp will only return valid information about an IP address for other addresses on the same subnet. So, if the IP address you are asking about is beyond a router (or switch), then you will only be able to get information about the nearside router interface. Thanks to yibC for pointing this out.

"Ex Libris un Peut de Tout"

In reply to Re: Re: Re: MAC address for Linux Machine by nimdokk
in thread MAC address for Linux Machine by vvrao_2000

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