Apparatus

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sensors Mode-S transponder

A21BA0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N235FR · AIRBUS A-320 · operated by UMB BANK NA TRUSTEE

Hex
A21BA0
Octal
50415640
Decimal
10,623,904
Country
US
Tail
N235FR
Type
A320
No current signal · last broadcast Jul 26, 21:00 UTC
Flights observed
402
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:00 UTC

Last known position

Most recent position reported by Mode-S A21BA0.

Country allocation

The ICAO 24-bit address A21BA0 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
FFT9435 - 7 2026-07-15
FFT4371 - 6 2026-07-02
FFT3412 Frontier Airlines 6 2026-04-17
FFT4524 Frontier Airlines 5 2026-07-20
FFT4372 - 5 2026-07-02
FFT3981 - 5 2026-06-22
FFT1750 Frontier Airlines 5 2026-04-19
FFT1749 Frontier Airlines 5 2026-07-18
FFT687 - 4 2026-06-29
FFT3326 Frontier Airlines 4 2026-06-18
FFT3277 - 4 2026-06-25
FFT2908 Frontier Airlines 4 2026-06-04
FFT2615 Frontier Airlines 4 2026-05-20
FFT2147 - 4 2026-07-04
FFT1874 - 4 2026-06-29
FFT1713 Frontier Airlines 4 2026-04-17
FFT1127 - 4 2026-06-30
FFT690 Frontier Airlines 3 2026-07-07
FFT686 - 3 2026-06-29
FFT685 - 3 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FFT1371 MDW → DFW Jul 26, 19:55 UTCJul 26, 20:55 UTC1h 0m
2026-07-26 FFT3071 ORF → ATL Jul 26, 16:20 UTCJul 26, 17:40 UTC1h 20m
2026-07-26 FFT3072 ATL → ORF Jul 26, 13:44 UTCJul 26, 14:51 UTC1h 7m
2026-07-26 FFT3072 ATL → ORF Jul 26, 13:40 UTCJul 26, 15:00 UTC1h 20m
2026-07-26 FFT4873 FLL → ATL Jul 26, 10:30 UTCJul 26, 11:55 UTC1h 25m
2026-07-26 FFT2174 ATL → FLL Jul 26, 03:20 UTCJul 26, 04:35 UTC1h 15m
2026-07-25 FFT3500 MCI → ATL Jul 25, 23:15 UTCJul 26, 00:50 UTC1h 35m
2026-07-25 FFT3499 ATL → MCI Jul 25, 20:15 UTCJul 25, 21:55 UTC1h 40m
2026-07-25 FFT2144 LAS → PHL Jul 25, 17:20 UTCJul 25, 18:50 UTC1h 30m
2026-07-25 FFT2779 PHX → SNA Jul 25, 14:21 UTCJul 25, 15:57 UTC1h 36m
2026-07-25 FFT2779 PHX → SNA Jul 25, 14:35 UTCJul 25, 16:15 UTC1h 40m
2026-07-25 FFT1853 TPA → ATL Jul 25, 11:15 UTCJul 25, 12:30 UTC1h 15m
2026-07-24 FFT3355 ISP → TPA Jul 24, 23:45 UTCJul 25, 02:40 UTC2h 55m
2026-07-24 FFT3324 TPA → ISP Jul 24, 20:10 UTCJul 24, 22:30 UTC2h 20m
2026-07-24 FFT2953 IAD → TPA Jul 24, 16:35 UTCJul 24, 18:20 UTC1h 45m
2026-07-24 FFT2954 TPA → IAD Jul 24, 13:20 UTCJul 24, 15:10 UTC1h 50m
2026-07-24 FFT2746 DEN → TPA Jul 24, 07:05 UTCJul 24, 10:15 UTC3h 10m
2026-07-24 FFT2443 PNS → DEN Jul 24, 01:20 UTCJul 24, 04:25 UTC3h 5m
2026-07-23 FFT3930 DEN → PNS Jul 23, 21:35 UTCJul 24, 00:10 UTC2h 35m
2026-07-23 FFT3930 DEN → PNS Jul 23, 21:03 UTCJul 24, 00:08 UTC3h 5m
2026-07-23 FFT4639 - Jul 23, 16:25 UTCJul 23, 19:15 UTC2h 50m
2026-07-23 FFT1918 DEN → CLE Jul 23, 12:15 UTCJul 23, 14:45 UTC2h 30m
2026-07-23 FFT3311 MCO → DEN Jul 23, 02:45 UTCJul 23, 06:10 UTC3h 25m
2026-07-22 FFT186 GUA → MCO Jul 22, 21:00 UTCJul 22, 23:30 UTC2h 30m
2026-07-22 FFT186 GUA → MCO Jul 22, 21:00 UTCJul 22, 23:24 UTC2h 24m
2026-07-22 FFT186 GUA → MCO Jul 22, 19:40 UTCJul 22, 19:50 UTC10m
2026-07-22 FFT187 MCO → GUA Jul 22, 17:30 UTCJul 22, 19:10 UTC1h 40m
2026-07-22 FFT1056 CLE → MCO Jul 22, 12:55 UTCJul 22, 14:50 UTC1h 55m
2026-07-22 FFT1915 MCO → CLE Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-20 FFT4524 AUS → MCO Jul 20, 16:30 UTCJul 20, 19:20 UTC2h 50m
2026-07-20 FFT4524 AUS → MCO Jul 20, 14:55 UTCJul 20, 15:05 UTC10m
2026-07-20 FFT4523 MCO → AUS Jul 20, 11:50 UTCJul 20, 14:10 UTC2h 20m
2026-07-20 FFT2530 DTW → MCO Jul 20, 00:25 UTCJul 20, 02:30 UTC2h 5m
2026-07-19 FFT2713 MCO → DTW Jul 19, 20:55 UTCJul 19, 23:15 UTC2h 20m
2026-07-19 FFT362 DEN → SDF Jul 19, 12:30 UTCJul 19, 18:20 UTC5h 50m
2026-07-19 FFT2520 DEN → MCO Jul 19, 06:10 UTCJul 19, 09:15 UTC3h 5m
2026-07-19 FFT2520 DEN → MCO Jul 19, 06:05 UTCJul 19, 09:24 UTC3h 19m
2026-07-19 FFT3311 MCO → DEN Jul 19, 01:00 UTCJul 19, 04:15 UTC3h 15m
2026-07-18 FFT2548 CVG → MCO Jul 18, 21:10 UTCJul 18, 23:05 UTC1h 55m
2026-07-18 FFT26 CUN → CVG Jul 18, 16:30 UTCJul 18, 18:00 UTC1h 30m
2026-07-18 FFT26 CUN → CVG Jul 18, 16:05 UTCJul 18, 19:11 UTC3h 6m
2026-07-18 FFT27 - Jul 18, 11:50 UTCJul 18, 14:50 UTC3h 0m
2026-07-18 FFT1749 MCO → CVG Jul 18, 02:35 UTCJul 18, 04:20 UTC1h 46m
2026-07-17 FFT3554 MSY → MCO Jul 17, 23:30 UTCJul 18, 01:05 UTC1h 35m
2026-07-17 FFT3554 MSY → MCO Jul 17, 23:31 UTCJul 18, 01:00 UTC1h 29m
2026-07-17 FFT1431 MCO → MSY Jul 17, 21:00 UTCJul 17, 22:29 UTC1h 30m
2026-07-17 FFT1431 MCO → MSY Jul 17, 19:28 UTCJul 17, 22:25 UTC2h 57m
2026-07-17 FFT1654 - Jul 17, 15:00 UTCJul 17, 17:25 UTC2h 25m
2026-07-17 FFT1653 - Jul 17, 11:10 UTCJul 17, 13:29 UTC2h 20m
2026-07-17 FFT1612 CMH → MCO Jul 17, 00:55 UTCJul 17, 02:39 UTC1h 45m

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 N235FR page for operator, model, and routing details .

Mode-S A21BA0 frequently asked

What is Mode-S code A21BA0?
A21BA0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N235FR.
Where is Mode-S A21BA0 registered?
Mode-S code A21BA0 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 A21BA0 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A21BA0, octal 50415640, decimal 10,623,904.
What flights does A21BA0 operate?
Mode-S A21BA0 has broadcast 20 distinct callsigns, including FFT9435, FFT4371, FFT3412, FFT4524, FFT4372.