How to learn a wireless router's MAC address

Option-click on the Wi-Fi icon. Once the menu appears, press Option again. Now when you hover over any network a tooltip with the MAC address (BSSID) will appear after a short delay.

We can use system_profiler command.

"system_profiler SPNetworkDataType | grep RouterHardwareAddress"

Sample output: Network Signature: IPv4.Router=10.104.26.1;IPv4.RouterHardwareAddress=00:10:db:ff:81:70

Another way out is you can get the MAC address associated with an IP address. In your case, you need to find your router's IP address. Normally, it's your Default Gateway. You can do all of these using the command lines.

First, you need to get your Default Gateway. Type netstat -nr | grep default. The output should show something like this:

default            192.168.1.1        UGSc           31        0     en1

From that, you could pretty sure that your router's IP address is 192.168.1.1. Then, you must find the MAC address associated to this IP by using arp -a | grep 192.168.1.1 command. The output will show you the router's MAC address.

? (192.168.1.1) at 0:c:42:64:bd:10 on en1 ifscope ...

Hope that help :)