Sometimes it’s necessary to discover the MAC address of a remote system on a network quickly (for example when setting up DHCP scope reservations). It’s fortunately a really easy process to determine this information.
First of all, ping the remote host, then run an
at the command line. This will give you the MAC details. The catch is that this only works on the same subnet – when trying to do this on a remote subnet (on the other side of a router, etc) you won’t get a response…there is a solution for this though, as long as the remote host you want to determine the MAC for is a Windows host.
NBTscan is a tool that can do this (and is available from the repositories on most linux distros (or at least on Debian, Ubuntu and Fedora, and is also downloadable for Windows ;))