Find out MAC Adress from an IP

[lukelukeluke]

Hi there,
I been working on a php/web project.

Now I wonder if there is any way to find out the mac address from someone you know the ip. Not with php but generally...
I wanted to integrate a user-block system by mac address...

Any ideas?

 

[manarth]

If you're searching for stuff, the keyword is ARP/ Address Resolution Protocol.

MAC addresses are non-routed: they're only available to the local subnet. To discover a MAC address you must be on the same subnet, or have software which runs on the target machine or a machine on the same subnet.

A typical trick for a one-time find the MAC is to ping the target IP, and then examine your machine's MAC cache. I'm sure more practical PHP solutions exist!

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