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I would like to retrieve the ethernet address of the network interface that is used to access a particular website.
How can this be done in Java?
Solution Note that the accepted solution of getHardwareAddress is only available in Java 6. There does not seem to be a solution for Java 5 aside from executing i(f|p)confing.
java.net.NetworkInterface.getHardwareAddress (method added in Java 6)
It has to be called on the machine you are interested in – the MAC is not transferred across network boundaries (i.e. LAN and WAN). If you want to make use of it on a website server to interrogate the clients, you’d have to run an applet that would report the result back to you.
For Java 5 and older I found code parsing output of command line tools on various systems.