IP Mac Address question
 

Is it possible to find out the MAC address of an IP address?

are you on the local machine or trying to pull this information remotely?

Remotely.

dont believe its possible remotely.

Thought so, just wanted to confirm :)

You can lookup MAC addresses on manageble switches by the port, in the router you can view the arp table where you can see the IP's used by a specific MAC address.

so do credit card companies have access to the MAC of fraudulent card users?

always wondered this

No reliable way to do this that I know of. If your trying to find the mac address of a windows machine, and it has port 137 open (NetBIOS) you can use nbtscan to find the mac address remotely. http://www.inetcat.org/software/nbtscan.html

Finding mac addresses of network cards on a LAN on the other hand is a bit easier.

They might if the card users ISP provides them with that information.. I have no idea if they share that or not, but it could easily be possible. Mac addresses can be changed, however so im not sure how valuble that information would be.

And in case they does, what do they want to do with your MAC address, it is useless, i mean you cant just block it with a PHP script or something.

I am sure they will collect IP info but MAC no, i am sure they wont be able to.

I think that it is not possible get it by server side script

No not without installing software on the clients machine. This information is not provided in the headers of a browser of which then a server could request it. There are no client side browser scripts that have this available to them either (ie javascript)

Only way is an intrusive program on the clients computer, which they would have to install. Or you would have to trick them into installing.