According to the FAA:
Recreational drone pilots may register once and apply their registration number to all the devices listed within their inventory. During registration, you must list the serial number(s) of each Standard Remote ID drone and/or the Remote ID broadcast module. If you use a Remote ID broadcast module, the Remote ID serial number attached to the module must be listed for each drone not equipped with Standard Remote ID you add to your inventory. This will permit you to move the module from one drone not equipped with Standard Remote ID to another so long as each of the drones make/model are listed within the same inventory.
This is not the case for Part 107 pilots who must register each individual device (Standard Remote ID drone or Remote ID broadcast module) separately within their inventory and each device will get a unique registration number
Remote Identification of Drones | Federal Aviation Administration (faa.gov)
It’s a bit confusing – somewhat detailed instructions are at the FAA link.
Recreational Flyers
If your drone transmits RID, or you add an external RID module to any drone that does not come with built-in RID, then yes, you need to register your drone with the FAA – even for hobbyist and recreational users.
Drones under 250 grams do not require RID – BUT, the way this is worded, if it has RID built-in, then you still need to register it with the FAA.
Recreational users pay a single $5 fee for 3 years and can register all of their drones under that single registration.
Part 107 Remote Pilots
All drones used for any purpose under Part 107 operations – regardless of their weight – must be registered individually with the FAA. Cost is $5 per drone. Part 107 users are required to register each drone individually. Who knows why?
