N23U is reserved. Post-cancellation hold held by Cancelled/Not Assigned — if it isn't renewed, the FAA releases it on Dec 31, 2027 (in about 18 months).
This tail was recently cancelled. The FAA holds cancelled N-numbers before releasing them back to the public.
Reservations lapse more often than you'd think. Check back around Dec 31, 2027 — if the holder doesn't renew, it becomes available. See everything scheduled to free up in December 2027.
N23U has been worn before. Past registrations from FAA deregistration records: