Hello, If you see "localhost" listed as a device on your eero network, there is no need to be concerned. "localhost" is a term commonly used in computer networking to refer to the current device or the loopback address (127.0.0.1). It is a way for a device to refer to itself. In the context of your eero network, seeing "localhost" listed simply means that the eero system is recognizing the device itself. It is not indicative of any external threat or issue with your network.