Apparatus

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sensors Mode-S transponder

A21432

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N233FR · AIRBUS A-320 · operated by UMB BANK NA TRUSTEE

Hex
A21432
Octal
50412062
Decimal
10,622,002
Country
US
Tail
N233FR
Type
A320
No current signal · last broadcast 3h ago
Flights observed
432
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A21432.

Country allocation

The ICAO 24-bit address A21432 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 20 distinct

Callsign Airline Flights Last seen
FFT685 - 5 2026-06-20
FFT4794 - 5 2026-07-10
FFT4435 Frontier Airlines 5 2026-06-29
FFT4092 Frontier Airlines 5 2026-05-10
FFT3624 - 5 2026-07-13
FFT1713 - 5 2026-07-13
FFT689 - 4 2026-07-10
FFT4091 Frontier Airlines 4 2026-05-10
FFT3312 - 4 2026-07-11
FFT3054 - 4 2026-06-28
FFT2912 - 4 2026-06-29
FFT2818 - 4 2026-06-23
FFT1823 Frontier Airlines 4 2026-06-07
FFT1500 - 4 2026-07-07
FFT690 Frontier Airlines 3 2026-06-19
FFT688 - 3 2026-07-09
FFT686 Frontier Airlines 3 2026-05-17
FFT4989 Frontier Airlines 3 2026-05-29
FFT4828 Frontier Airlines 3 2026-07-07
FFT4771 - 3 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 FFT2868 - Jul 14, 20:30 UTCJul 14, 21:00 UTC30m
2026-07-14 FFT363 MCO → MCO Jul 14, 12:20 UTCJul 14, 18:05 UTC5h 45m
2026-07-14 FFT1785 - Jul 14, 01:50 UTCJul 14, 03:15 UTC1h 25m
2026-07-13 FFT1234 MCO → RDU Jul 13, 22:05 UTCJul 14, 00:05 UTC2h 0m
2026-07-13 FFT1432 MSY → MCO Jul 13, 18:20 UTCJul 13, 19:45 UTC1h 25m
2026-07-13 FFT1432 MSY → MCO Jul 13, 18:09 UTCJul 13, 19:41 UTC1h 32m
2026-07-13 FFT3553 MCO → MSY Jul 13, 15:00 UTCJul 13, 16:30 UTC1h 30m
2026-07-13 FFT3624 - Jul 13, 11:25 UTCJul 13, 13:05 UTC1h 40m
2026-07-13 FFT1713 - Jul 13, 02:20 UTCJul 13, 04:10 UTC1h 50m
2026-07-12 FFT3560 BNA → MCO Jul 12, 23:05 UTCJul 13, 00:40 UTC1h 35m
2026-07-12 FFT3559 MCO → BNA Jul 12, 20:20 UTCJul 12, 21:55 UTC1h 35m
2026-07-12 FFT4685 - Jul 12, 15:55 UTCJul 12, 16:50 UTC55m
2026-07-12 FFT4685 - Jul 12, 14:20 UTCJul 12, 14:30 UTC10m
2026-07-12 FFT4686 - Jul 12, 10:15 UTCJul 12, 10:50 UTC35m
2026-07-12 FFT2309 - Jul 12, 02:20 UTCJul 12, 04:05 UTC1h 45m
2026-07-12 FFT2309 BWI → MCO Jul 12, 02:20 UTCJul 12, 04:05 UTC1h 45m
2026-07-11 FFT4004 - Jul 11, 22:35 UTCJul 12, 00:50 UTC2h 15m
2026-07-11 FFT3312 - Jul 11, 17:15 UTCJul 11, 20:30 UTC3h 15m
2026-07-11 FFT3312 DEN → MCO Jul 11, 17:23 UTCJul 11, 20:20 UTC2h 57m
2026-07-11 FFT1376 PHX → DEN Jul 11, 13:55 UTCJul 11, 15:20 UTC1h 25m
2026-07-11 FFT4753 DEN → PHX Jul 11, 04:50 UTCJul 11, 06:15 UTC1h 25m
2026-07-11 FFT2107 FSD → DEN Jul 11, 01:15 UTCJul 11, 02:25 UTC1h 10m
2026-07-11 FFT2107 FSD → DEN Jul 11, 01:22 UTCJul 11, 02:28 UTC1h 6m
2026-07-10 FFT2108 DEN → FSD Jul 10, 22:55 UTCJul 11, 00:05 UTC1h 10m
2026-07-10 FFT4793 - Jul 10, 19:40 UTCJul 10, 21:05 UTC1h 25m
2026-07-10 FFT4794 - Jul 10, 17:00 UTCJul 10, 18:30 UTC1h 30m
2026-07-10 FFT1815 - Jul 10, 13:05 UTCJul 10, 14:45 UTC1h 40m
2026-07-10 FFT2890 - Jul 10, 09:55 UTCJul 10, 11:35 UTC1h 40m
2026-07-10 FFT689 - Jul 10, 03:40 UTCJul 10, 07:20 UTC3h 40m
2026-07-10 FFT689 - Jul 10, 00:50 UTCJul 10, 01:20 UTC30m
2026-07-09 FFT688 - Jul 9, 18:20 UTCJul 9, 22:10 UTC3h 50m
2026-07-09 FFT2549 DFW → DEN Jul 9, 14:20 UTCJul 9, 15:55 UTC1h 35m
2026-07-09 FFT2550 DEN → DFW Jul 9, 11:10 UTCJul 9, 12:30 UTC1h 20m
2026-07-09 FFT4625 - Jul 9, 01:15 UTCJul 9, 04:00 UTC2h 45m
2026-07-08 FFT4626 DEN → MEM Jul 8, 22:15 UTCJul 9, 00:00 UTC1h 45m
2026-07-08 FFT3565 - Jul 8, 17:55 UTCJul 8, 20:30 UTC2h 35m
2026-07-08 FFT3566 DEN → DTW Jul 8, 14:10 UTCJul 8, 16:35 UTC2h 25m
2026-07-08 FFT3566 DEN → DTW Jul 8, 13:54 UTCJul 8, 16:27 UTC2h 33m
2026-07-08 FFT1927 OKC → DEN Jul 8, 01:20 UTCJul 8, 02:50 UTC1h 30m
2026-07-07 FFT1928 DEN → OKC Jul 7, 22:30 UTCJul 8, 00:00 UTC1h 30m
2026-07-07 FFT3375 - Jul 7, 19:00 UTCJul 7, 20:20 UTC1h 20m
2026-07-07 FFT3375 MCI → DEN Jul 7, 18:56 UTCJul 7, 20:13 UTC1h 17m
2026-07-07 FFT4828 DEN → MCI Jul 7, 16:25 UTCJul 7, 17:40 UTC1h 15m
2026-07-07 FFT4828 DEN → MCI Jul 7, 16:29 UTCJul 7, 17:36 UTC1h 7m
2026-07-07 FFT1500 - Jul 7, 13:20 UTCJul 7, 15:05 UTC1h 45m
2026-07-07 FFT1261 DEN → ONT Jul 7, 05:15 UTCJul 7, 07:10 UTC1h 55m
2026-07-07 FFT4567 STL → DEN Jul 7, 01:50 UTCJul 7, 03:35 UTC1h 45m
2026-07-06 FFT3302 DEN → STL Jul 6, 23:15 UTCJul 7, 00:55 UTC1h 40m
2026-07-06 FFT3375 - Jul 6, 19:10 UTCJul 6, 20:25 UTC1h 15m
2026-07-06 FFT4828 DEN → MCI Jul 6, 16:35 UTCJul 6, 17:50 UTC1h 15m

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 N233FR page for operator, model, and routing details .

Mode-S A21432 frequently asked

What is Mode-S code A21432?
A21432 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N233FR.
Where is Mode-S A21432 registered?
Mode-S code A21432 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 A21432 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A21432, octal 50412062, decimal 10,622,002.
What flights does A21432 operate?
Mode-S A21432 has broadcast 20 distinct callsigns, including FFT685, FFT4794, FFT4435, FFT4092, FFT3624.