Uses ssh to search to the unifi mongo db for a mac address.
The unoffical unifi API doesn't have a simple way to search by mac address.
Here's a bash script to do it for you.
Download to anywhere you can run bash scripts from and reach the cli of your unifi server.
If you are using Windows, I recommend checking out mobaxterm.
Modify the server and username (lines 18 & 19) appropriately.
sh checkUnifi.sh aa:bb:cc:dd:ee:ff
It'll ask for your password, connect to your unifi server, and use mongodb commands to search for the mac and the site information.
FAQ:
Why?
While most people install wifi equipment that never moves, I have the pleasure of working with rental equipment that moves all over the place as needed. We have multiple unifi servers with anywhere from 20 to 60 sites each and ometimes inventory control just doesn't work the way it should I often end with with a box of dusty devices on my desk with faded ID labels that may or may not have been reset ( or cleaned ).
Why not use the API?
The Unifi API is not officially supported by Ubiquiti. ( https://ubntwiki.com/products/software/unifi-controller/api ) In my opinion, it is much more likely that the front-end devs will change something in a future update that affects the "api", than it is for the back-end database structure to be changed.
That said, I make no guarantees.