If you have wireless capable devices like LG Nexus 4 phone and want to connect to the WiFi network, you need a unique numeric code called MAC address (media access control) for Mac Filtering.
How to Find WiFi Mac Address on LG Nexus 4 Android smartphone
* From Home screen, tap "Settings" > "Wireless & networks" > "Wi-Fi", and turn the switch to On.
* Press the Menu and choose Advanced. The information what you need is there.
* You can also go to Setting. Scroll down and tap on "About device" > "Status", then you will see Wi-Fi Mac address.