Open: terminal (Ubuntu: open the dash, type terminal, hit ↵)
Enter: ifconfig -a
The wireless ethernet devices are called wlan0, wlp1s0, wlp2s0 and so on; The MAC address is in the first line of the output, labeled HWaddr (it will look like cc:ff::aa:bb:11:ee).
Windows (two methods)
Method 1:
Click on Start button. Then type cmd in Search field.
Click on cmd to open console window. Then type getmac /v and press Enter ↵.
Check the Connection Name with Wireless Network or Wi-Fi for its Physical Address which will look like cc:ff::aa:bb:11:ee
Method 2:
(Note: Should be connected to any WiFi before you try this method)
Go to Control Panel --> Network and Internet --> Network and Sharing Center
Click on Change adapter settings to go to Network Connections Window
Double click on the Wi-Fi icon to get Wi-Fi Status Tab
Then Click on details and then view Physical Address section mentioned similar to cc:ff::aa:bb:11:ee
(click to enlarge)
Click on the Apple menu then System Preferences then Network
MAC address for wireless connections:
Select AirPortorWi-Fi from the list on the left.
Click the Advanced button.
On the AirPort or Wi-Fi tab, the AirPort ID or Wi-Fi Address is your MAC address.
(Click to enlarge)
Android
Go to Settings.
Select About Phone-->Status-->WiFi Mac Address
Kindle
From the Home screen press Menu
Select Settings
The Wi-Fi MAC Address is located toward the bottom of the screen in the Device Info section.
From the Home menu, tap on Settings.
Tap on General
Tap on About
Scroll down to Wi-Fi Address and write down the address. This is your MAC address.
Note : In latest versions disable Private address.