Your ethernet hardware address is a unique 12 digit hexadecimal address that the ethernet card manufacturer assigns to your card. This address is also sometimes called a MAC address, Node address, and Adapter address. This address is also seen in a variety of formats. There are a variety of ways you can determine your hardware address. Perhaps the simplest way is to look at the card itself.
Some manufacturers place a sticker on the card with the hardware address.
Others engrave the address on the card itself. Another way to determine the hardware address is to use the diagnostics software that should have come on disk with the card. The location of this software depends on the card. Some operating systems have the ability to determine the ethernet hardware address for a card that is installed. Below are instructions for determining the hardware address on some of the more common operating systems.