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Unknown device connected to network

Hello Fing Community,
Recently I took notice an unknown device has been connected to my AT&T home WiFi network. Yet, Fing and my AT&T app don’t show it connected. Only when I log into my router directly does it show. The device also renamed itself as an iPhone and now today it doesn't have a name and the connection Type is masked. All that is shown is the MAC address.
i believe an ex friend of mine planted something in my apartment and that it is hidden in my bathroom. Previously it showed showed a signal strength of in the red, which is what my own phone has in the bathroom area. This ex friend of mine would spend a lot of time in bathroom and recently before we ended the friendship, I caught him lying about using the bathroom. Also the previous signal strength showed red just like my phone would in the bathroom. He is good with technology or knows people that are. How can I locate this device. I feel like it’s a spy cam. The weird thing is the MAC address registers as apple. Oh and I was able to get an IP address, because the one time it renamed itself as from unknown to an iPhone it had an IP address associated with it. Please see below the screen shots of this device accessing my WiFi. You will see based on the dates how the person has tried to mask or alter the device on the site. The only way I recognize it is by the MAC address. Anyone, I’d greatly appreciate the help on locating this device.
IP Address: 192.168.1.231
MAC address: 74:42:8b:b5:e3:44
Answers
Not sure how you can locate the device but you can change your wireless login information to your router and it will no longer be able to connect.
If the device has night vision it should be easy to find. Make the room as dark as possible so the Nightvision kicks on. Then take out your phone and turn your phone camera on. Look around the room with your phone camera.
If there is a Nightvision device in there then it should show purple lights on your screen.