Orbi showing unknown device

[Yuniverse]

Orbi with 1.5.0.12 firmware showing a device with unknown name, unknown ip - only showing the MAC.  I tried to block it with access control but it just won't let me block it.

I don't know if i should list the MAC address of the device, but here it goes 

Please help

B4:75:0E:ED:31:6D

[loomis1975]

Its something made by Belkin, so it could be a Belkin or Linksys product I'm guessing.  Got any of those in your house?