N713 is taken. It's currently assigned to a 2020 Vans Aircraft Inc RV-12IS registered in Winfield Park, NJ.
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.
N713 has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N713 that aren't assigned or reserved: