N-number Combinations & Current Availability
Type of N-number Example Possible Combinations Quantity
1 Number N1 9 numbers(FAA use only) 9
2 Numbers N12 9 numbers x 10 numbers(FAA use only) 90
3 Numbers N123 9 numbers x 10 numbers x 10 numbers 900
4 Numbers N1234 9 numbers x 10 numbers x 10 numbers x 10 numbers 9,000
5 Numbers N12345 9 numbers x 10 numbers x 10 numbers x 10 numbers x 10 numbers 90,000
1 Number + 1 Letter N1A 9 numbers x 24 letters 216
2 Numbers + 1 Letter N12A 9 numbers x 10 numbers x 24 letters 2,160
3 Numbers + 1 Letter N123A 9 numbers x 10 numbers x 10 numbers x 24 letters 21,600
4 Numbers + 1 Letter N1234A 9 numbers x 10 numbers x 10 numbers x 10 numbers x 24 letters 216,000
1 Number + 2 Letters N1AB 9 numbers x 24 letters x 24 letters 5,184
2 Numbers + 2 Letters N12AB 9 numbers x 10 numbers x 24 letters x 24 letters 51,840
3 Numbers + 2 Letters N123AB 9 numbers x 10 numbers x 10 numbers x 24 letters x 24 letters 518,400
Total N-number combinations 915,399
N1 through N99 are reserved for FAA use only -99
U.S. registered aircraft with assigned N-numbers (+/-) -293,000
N-numbers "Cancelled / Not assigned" and held by FAA (+/-) -65,000
N-numbers reserved by individuals & businesses, not assigned to aircraft (+/-) -37,300
N-numbers currently available from FAA.gov 520,000
N-numbers currently available from Short-N-Numbers.com 1,700
Notes:
Updated October 2018
N-numbers can not start with zero
N-numbers can not contain letters i or o