How to Check if an N-Number Is Available (And Reserve One)

Want a custom N-number? Here's how to check availability, what makes a valid N-number, and how to reserve one through the FAA — including costs, restrictions, and processing times.

How to Check if an N-Number Is Available (And Reserve One)

Every civil aircraft registered in the United States has an N-number — the alphanumeric identifier painted on the fuselage and encoded in your registration. Most aircraft get assigned a number sequentially, but you can request a specific custom N-number if you want one. Here's how the process works.

What Makes a Valid N-Number?

N-numbers follow specific FAA rules:

  • Must begin with the letter N
  • Can be 1-5 characters after the N (total including N: 2-6 characters)
  • Can contain digits (1-9 for the first digit after N, 0-9 after that) and the letters A-Z, except I and O (which look too similar to 1 and 0)
  • Cannot end in more than two letters
  • The number portion cannot begin with 0

Valid examples: N1, N12345, N172SP, N747BA Invalid examples: N012 (starts with 0), N1234IO (contains I or O)

How to Check Availability

The FAA's aircraft registry is publicly searchable. If an N-number returns no results, it may be available — but "available" in the registry doesn't always mean unencumbered. Some numbers are reserved, canceled, or held in administrative limbo.

Aeradex lets you check N-number availability at aeradex.com/pilot/documents with a real-time lookup against FAA registry data. The tool is free to use — searches are rate-limited to 20 per day per account to prevent bulk scraping.

How to Reserve an N-Number

Once you've found an available N-number you want, the reservation process:

Through the FAA directly:

  • Submit FAA Form 8050-64 (Application for Reservation or Assignment of Special Registration Number)
  • Pay the $10 reservation fee
  • Mail to the FAA Civil Aviation Registry in Oklahoma City

Reservations are good for one year and can be renewed. Once reserved, the number is held in your name and cannot be assigned to another aircraft.

Processing time: 4-8 weeks for confirmation. The FAA does not hold the number until your application is processed and accepted, so there's a small window where someone else could submit for the same number simultaneously. Act promptly once you've identified the N-number you want.

What Does It Cost?

  • Availability check: free
  • Reservation: $10 FAA fee
  • If using Aeradex's reservation service ($29.99): Aeradex handles the Form 8050-64 filing, tracks the application, and manages any follow-up paperwork

Changing Your Existing N-Number

If you already own an aircraft and want to change its N-number to a custom one:

  • Reserve the new N-number
  • Once reservation is confirmed, submit an application to reassign the number to your aircraft
  • Update your airworthiness certificate and re-paint the aircraft with the new number (required within a set timeframe)

Changing an existing N-number is more involved than reserving one for a new registration. Factor in the cost of re-painting or re-decaling the aircraft.

Is a Custom N-Number Worth It?

For most GA pilots, the sequential number assigned at registration is perfectly fine. Custom N-numbers make the most sense for:

  • Aircraft used for business where the N-number appears on marketing materials
  • Type-specific numbers that reference the aircraft (N172SR on a Cessna 172, for example)
  • Personal significance — initials, memorable numbers

It's a small administrative process with a modest cost. If you have a number in mind, check availability first — you might be surprised what's still available.