N4852K is taken. It's currently assigned to a 1949 Ryan NAVION A registered in Elk River, MN.
See the full aircraft record →A tail number only frees up if the owner deregisters the aircraft or moves it to a different N-number — and even then the FAA holds it before releasing it to the public.
N4852K has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N4852K that aren't assigned or reserved: