How do you get Mac address?

Answer 1

You don't "Get" one, because you already have one. A MAC Address uniquely identifies your computer's network interface card on the network. If you're asking how do you know what your MAC address is:

Windows:

Start>Run>type "cmd"

in the black window that appears type "ipconfig /all"

the MAC address will be listed as "Physical Address" and usually starts with 00-

In Mac OS X 10.5 and later, in the left column of the Network preference window that opens, click the name of your connection (e.g., AirPort, Ethernet, Built-in Ethernet). Click the Advanced... button, and in the sheet that drops down, click either the Ethernet or AirPort tab. The string of letters and numbers next to "Ethernet ID:" or "AirPort ID:" is your MAC address.

In Mac OS X 10.3 or 10.4, in the Network preference window that opens, make sure the pull-down menu next to "Show:" lists your connection (e.g., AirPort, Built-in Ethernet). Under the Ethernet or AirPort tab, the string of letters and numbers next to "Ethernet ID:" or "AirPort ID" is your MAC address.

Alternatively, you could use "ifconfig -a"

Linux:

Open a shell, use "ifconfig -a". This will display your current network settings for each interface available on your computer.

An example of what a MAC address would look like:

00-FF-20-58-C9-60

*NOTE* all devices that access the internet have a MAC address (iPhone, PS3, PSP, Switches, Firewalls, Routers, cable modems, cell phones, etc)

Wikipedia:

In computer networking, a Media Access Control address(MAC address) is a unique identifier assigned to most network adapters or network interface cards (NICs) by the manufacturer for identification, and used in the Media Access Control protocol sub-layer. If assigned by the manufacturer, a MAC address usually encodes the manufacturer's registered identification number. It may also be known as an Ethernet Hardware Address (EHA), hardware address, adapter address, or physical address.

http://en.wikipedia.org/wiki/Mac_address