Since Circle uses MAC addresses to track devices this could lead to new 'Unknown devices' appearing in your device list. For both operating systems this feature is enabled by default.
Have any devices with Android 10 or iOS 14 (or versions above that) on your network? These OS versions and above include a feature to use randomized MAC addresses when a device connects to a network. Why is Circle finding these 'Unknown' devices? Are you suddenly seeing a large number of 'Unknown Devices' appearing in your Circle device list or a device with the same name, but multiple entries and MAC addresses? This might be caused by one of your devices using a new privacy feature, a settings change on a Windows 10 device, or some software on the device.
