N400B is reserved. Fee-paid reservation held by N-Num.Com LLC — if it isn't renewed, the FAA releases it on Dec 20, 2026 (in about 6 months).
Reserved by an individual or company for $10 per year.
Reservations lapse more often than you'd think. Check back around Dec 20, 2026 — if the holder doesn't renew, it becomes available. See everything scheduled to free up in December 2026.
N400B has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N400B that aren't assigned or reserved: