AWS IoT Device Management is a service that allows you to onboard, organize, monitor, and remotely manage connected devices at scale. Within AWS IoT Device Management, fleet indexing allows you to index the Registry, Device Shadow, and connection state for every device in your fleet, as well as search for devices based on any combination of these attributes. You can use fleet indexing to query which devices are running a particular version of firmware, or to query which devices are actively connected to AWS IoT.