Unknown Android Device - Can't Delete

I have an unknown Android device in my device list (see table entry below from Firefox router interface). I don't have any Android devices that I know of. I can't get rid of it. If I go into the app on my iPhone, there is no "Delete This Device" button like there is for my other devices.

I changed the wifi password and rebooted my router but the device persists. All my other devices the my WebTV, a Rasberry Pi, my computer, and my iPhone are all in the IP address range of 192.168.1.2 to 192.168.1.9 The Android is at 192.168.1.239.

Anyone have any thoughts?

Allowed

--- ANDROID-F59324B2BCDF9582 192.168.1.239 192.168.1.239 C8:FC:40:18:94:A5 2.4G Orbi Router 78:D2:94:36:1D:91