sensors Mode-S transponder

A8E3B3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N672FR · AIRBUS A-321neo · operated by FRONTIER AIRLINES INC.

Hex
A8E3B3
Octal
52161663
Decimal
11,068,339
Country
US
Tail
N672FR
Type
A21N
No current signal · last broadcast 12h ago
Flights observed
14
Distinct callsigns
9
Country
US
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S A8E3B3.

Country allocation

The ICAO 24-bit address A8E3B3 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 9 distinct

Callsign Airline Flights Last seen
FFT2494 Frontier Airlines 3 2026-04-13
FFT3499 - 2 2026-04-13
FFT3021 - 2 2026-04-13
FFT2008 - 2 2026-04-13
FFT4874 - 1 2026-04-13
FFT3500 - 1 2026-04-13
FFT3287 - 1 2026-04-14
FFT3072 - 1 2026-04-12
FFT2899 - 1 2026-04-13

Recent flights last 14

DateFlightRouteTakeoffLandingDuration
2026-04-14 FFT3287 - Apr 14, 10:40 UTCApr 14, 11:05 UTC25m
2026-04-13 FFT3500 - Apr 13, 22:30 UTCApr 13, 23:45 UTC1h 15m
2026-04-13 FFT3499 - Apr 13, 19:50 UTCApr 13, 20:55 UTC1h 5m
2026-04-13 FFT3499 - Apr 13, 18:52 UTCApr 13, 20:57 UTC2h 5m
2026-04-13 FFT2494 TPA → DTW Apr 13, 16:15 UTCApr 13, 17:20 UTC1h 5m
2026-04-13 FFT2494 TPA → DTW Apr 13, 15:50 UTCApr 13, 17:20 UTC1h 30m
2026-04-13 FFT2494 TPA → DTW Apr 13, 15:30 UTCApr 13, 17:18 UTC1h 48m
2026-04-13 FFT3021 - Apr 13, 12:20 UTCApr 13, 13:55 UTC1h 35m
2026-04-13 FFT3021 - Apr 13, 12:05 UTCApr 13, 12:15 UTC10m
2026-04-13 FFT2899 - Apr 13, 08:53 UTCApr 13, 10:43 UTC1h 50m
2026-04-13 FFT2008 - Apr 13, 04:46 UTCApr 13, 07:34 UTC2h 48m
2026-04-13 FFT2008 - Apr 13, 04:26 UTCApr 13, 07:02 UTC2h 36m
2026-04-13 FFT4874 - Apr 13, 01:40 UTCApr 13, 03:10 UTC1h 30m
2026-04-12 FFT3072 - Apr 12, 20:01 UTCApr 12, 21:20 UTC1h 19m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N672FR page for operator, model, and routing details .

Mode-S A8E3B3 frequently asked

What is Mode-S code A8E3B3?
A8E3B3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N672FR.
Where is Mode-S A8E3B3 registered?
Mode-S code A8E3B3 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A8E3B3 broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8E3B3, octal 52161663, decimal 11,068,339.
What flights does A8E3B3 operate?
Mode-S A8E3B3 has broadcast 9 distinct callsigns, including FFT2494, FFT3499, FFT3021, FFT2008, FFT4874.