From 2015:
The UK is interested in developing and testing a tracking system that would allow officials to monitor all civilian drones flying at low altitudes (under 500 feet). The system may require drone operators to register their flight plans and follow a set of rules similar to those already in place for managing automobile traffic. Once in flight, the drone would be tracked possibly using the existing cell phone infrastructure as it moved along its route. Drone operators concerned about major changes to their hobby can rest easy for now as NASA is not expected to have a working prototype traffic management system in place until 2019.
…. The proposal includes a licensing or registration system that would require all drone operators to register their drones before they would be allowed to fly them. This database would be available online and possibly even tied to a smartphone app that would enable citizens to identify the owner of a drone flying overhead. Other proposals include the expanded use of geo-fencing to keep drones away from certain locations, such as airports and jails, where drone presence is not permitted.
Source: UK and NASA developing a drone tracking system | Digital Trends
