How can WiFi Scanner detect hidden SSIDs?

Detecting hidden SSIDs on Mac OS using WiFi Scanner requires the use of Apple's native scanner.

Detecting hidden SSIDs on Mac OS using WiFi Scanner requires the use of Apple's native scanner.

1. Launch WiFi Scanner
2. While holding the Option key, click on the WiFi Signal on your Mac Menu Bar. 
3. Then, in the drop down, click on the option Open Wireless Diagnostics...
   
4. Now, press Command and 4 on the keyboard at the same time. The Scan window should appear on your screen.
5. Press Scan Now in this window, a few times.  This will ensure you are scanning for the latest information.  If you see rows with no Network Name, then these are the Hidden SSIDs in your area.