A computer program product and a computer system for monitoring an operation status of a disconnected device by a mobile device and an audio analysis system in an infrastructure. The mobile device has connectivity to the infrastructure while the disconnected device has no connectivity to the infrastructure. The mobile device invokes passive listening of the mobile device to a sound generated by the disconnected device, determines whether the sound can be detected by the mobile device, and steams audio with information of a location of the mobile device to the audio analysis system. The audio analysis system determines whether the audio is recorded from the disconnected device, compares the audio with pre-recorded sounds of the disconnected device, determines the operation status of the disconnected device, and sends to the mobile device a notification of the operation status of the disconnected device.