Q:

Finding out which wifi AP the device used to access the network

Is it possible to find out the MAC Addr of AP the device used to connect the network? I can get the MAC address and IP address of the device(maybe notebook or smartphone), and I have to check the MAC address of the wifi device. (I'm not saying about the gateway address) There are lots of AP with same ESSID and different channels here, and I want to get which AP was used.

A:

If you want to know which AP your computer is connected to.  You have two options.  

Use inSSIDer to investigate your wireless network.  The network that you are connected will be indicated by the green wireless icon.

2 . Use built-in netsh command in Windows 7 or Windows 8
To do so, go to your Command Prompt that you can find in Accessories or click on the Windows button (Windows 7) or press Windows button on keyboard (Windows 8), and then type cmd

Command Prompt will be listed in front of you.  Click on it and type the following command line
netsh wlan show interfaces

What you need to focus on is BSSID value.  This is the MAC address of the AP that you are being connected.  Now you can go check the MAC address on the APs’ information label to find out which one you are connected to.
please check thise link Which Access Point am I connected to?

