Sometimes a device named "Circle" might appear in your devices list in the Circle app. What is this and why is it there?
Check the MAC address
With some network setups, Circle can detect itself as a device on your network. You'll know this is the case if the MAC address for the Circle device matches the Circle Device ID that appears under Menu > Manage. If that's the case we suggest setting this Circle to "Unmanaged". Tap on it, then "Assigned to..." and check the box next to "Unmanaged". You can also try plugging Circle in via Ethernet and then tapping "Remove from Circle" at the bottom of this device's settings page.
Hmm...
Sometimes a device named "Circle" might appear with a different MAC address than the one that appears under Menu > Manage. If that's the case it could be that an extender is seeing Circle and changing the MAC address slightly. Make sure to plug in Circle via ethernet and then open this device and tap "Remove from Circle". It's also possible that someone is trying to circumvent Circle's controls and doing what's called "MAC spoofing" to create a device that looks like Circle. If you try and remove the "Circle" device and it reappears, and has a different MAC address than your Circle Device ID you might be seeing some MAC spoofing. In that case try Pausing the device and see if anyone in your house complains. *smile*
I have Circle on Netgear
I have a Circle device