TailLookup

Tail numbers explained: what an N-number tells you

TailLookup · updated Jul 7, 2026

A tail number is a US aircraft's registration mark: the letter N followed by up to five digits and letters, assigned by the FAA. It identifies the registration — not the physical aircraft — and the same number can be reassigned to different airframes over the decades.

A US tail number is the aircraft’s registration mark: the letter N (the US country prefix) followed by one to five characters — digits first, optionally ending in one or two letters. N1258C, N747, and N12345 are all valid.

The number is not the aircraft

The single most misunderstood fact about tail numbers: they get reused. When an aircraft is deregistered — exported, scrapped, or re-marked — its number eventually returns to the pool. The same N-number can serve entirely unrelated airframes across decades. Any honest history report must separate the airframe (identified by serial number and model) from the mark it currently wears; TailLookup does this on every record and lists earlier aircraft that held the number.

Vanity numbers

Owners can reserve specific N-numbers (shorter and letter-suffixed ones are prized), which is why registrations move between aircraft in the first place.

What you can learn from one

With just the tail number you can pull the aircraft’s make, model, year, serial number, registered owner, registration status and history, and every NTSB accident record — here’s the full walkthrough.

Frequently asked

Why do US tail numbers start with N?
International agreements assign each country a registration prefix; the United States received N in the 1920s. Other examples: C for Canada, G for the United Kingdom.
Can two planes have the same tail number?
Not at the same time — but sequentially, yes. When an aircraft is deregistered, its number can eventually be reassigned to an unrelated aircraft, which is why history checks must match the serial number.
What can I learn from a tail number alone?
The aircraft's make, model, year, serial number, registered owner, registration status, and any NTSB accident records — all public, all free to look up.

Cite: TailLookup, “Tail numbers explained: what an N-number tells you”, https://taillookup.com/guides/tail-numbers-explained (updated 2026-07-07).

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