Yesterday, theFAA announcedthat recreational drones need to be registered by February 19, 2016.
Not all drones require registration, however, and it can be a bit confusing.
TheFAA has its own list of drone examplesthat require registration, but its not very thorough.
you could see the full list at the link below.
Do I Need to Register My Drone?
(You Do if Its on This List)| Wired