Apparatus

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sensors Mode-S transponder

A3904C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N329FR · AIRBUS A-320neo · operated by BANK OF UTAH TRUSTEE

Hex
A3904C
Octal
50710114
Decimal
10,719,308
Country
US
Tail
N329FR
Type
A20N
No current signal · last broadcast 1h ago
Flights observed
398
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A3904C.

Country allocation

The ICAO 24-bit address A3904C 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
FFT3871 Frontier Airlines 6 2026-06-05
FFT2526 Frontier Airlines 5 2026-06-07
FFT4685 Frontier Airlines 4 2026-07-10
FFT3923 - 4 2026-06-21
FFT3872 Frontier Airlines 4 2026-06-05
FFT3560 - 4 2026-07-10
FFT3045 - 4 2026-07-14
FFT2979 Frontier Airlines 4 2026-06-12
FFT1572 Frontier Airlines 4 2026-06-03
FFT1555 Frontier Airlines 4 2026-05-10
FFT1116 Frontier Airlines 4 2026-06-21
FFT689 Frontier Airlines 3 2026-04-17
FFT4957 Frontier Airlines 3 2026-06-06
FFT4793 Frontier Airlines 3 2026-07-04
FFT4420 Frontier Airlines 3 2026-05-06
FFT4092 Frontier Airlines 3 2026-04-13
FFT3559 - 3 2026-07-10
FFT3292 Frontier Airlines 3 2026-06-14
FFT3231 Frontier Airlines 3 2026-04-15
FFT3053 Frontier Airlines 3 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 FFT1157 - Jul 15, 02:55 UTCJul 15, 04:35 UTC1h 40m
2026-07-14 FFT1158 ATL → EWR Jul 14, 23:50 UTCJul 15, 01:40 UTC1h 50m
2026-07-14 FFT3046 MSP → ATL Jul 14, 19:45 UTCJul 14, 21:55 UTC2h 10m
2026-07-14 FFT3045 ATL → MSP Jul 14, 16:15 UTCJul 14, 18:15 UTC2h 0m
2026-07-14 FFT4601 EWR → ATL Jul 14, 10:05 UTCJul 14, 11:55 UTC1h 50m
2026-07-14 FFT9529 - Jul 14, 04:20 UTCJul 14, 04:30 UTC10m
2026-07-14 FFT3454 - Jul 14, 01:15 UTCJul 14, 03:10 UTC1h 55m
2026-07-13 FFT3975 MCO → ATL Jul 13, 21:35 UTCJul 13, 22:45 UTC1h 10m
2026-07-13 FFT3941 - Jul 13, 15:00 UTCJul 13, 17:15 UTC2h 15m
2026-07-13 FFT3942 - Jul 13, 11:30 UTCJul 13, 13:45 UTC2h 15m
2026-07-13 FFT1540 - Jul 13, 02:15 UTCJul 13, 04:05 UTC1h 50m
2026-07-13 FFT1540 IND → MCO Jul 13, 02:11 UTCJul 13, 04:03 UTC1h 52m
2026-07-12 FFT4837 MCO → IND Jul 12, 23:05 UTCJul 13, 00:55 UTC1h 50m
2026-07-12 FFT362 - Jul 12, 19:10 UTCJul 12, 19:25 UTC15m
2026-07-12 FFT362 SAP → MCO Jul 12, 16:27 UTCJul 12, 18:51 UTC2h 24m
2026-07-12 FFT363 MCO → MCO Jul 12, 12:45 UTCJul 12, 19:25 UTC6h 40m
2026-07-12 FFT2520 DEN → MCO Jul 12, 06:05 UTCJul 12, 09:10 UTC3h 5m
2026-07-12 FFT3311 MCO → DEN Jul 12, 00:45 UTCJul 12, 04:05 UTC3h 20m
2026-07-11 FFT2548 - Jul 11, 19:05 UTCJul 11, 21:05 UTC2h 0m
2026-07-11 FFT26 CUN → CVG Jul 11, 14:25 UTCJul 11, 17:20 UTC2h 55m
2026-07-11 FFT27 - Jul 11, 10:15 UTCJul 11, 13:10 UTC2h 55m
2026-07-11 FFT27 CVG → CUN Jul 11, 10:15 UTCJul 11, 13:05 UTC2h 50m
2026-07-11 FFT1749 MCO → CVG Jul 11, 02:05 UTCJul 11, 03:50 UTC1h 45m
2026-07-10 FFT3560 - Jul 10, 22:15 UTCJul 11, 00:15 UTC2h 0m
2026-07-10 FFT3559 MCO → BNA Jul 10, 19:00 UTCJul 10, 20:35 UTC1h 35m
2026-07-10 FFT4685 PSE → MCO Jul 10, 14:25 UTCJul 10, 16:55 UTC2h 30m
2026-07-10 FFT4686 - Jul 10, 10:40 UTCJul 10, 11:30 UTC50m
2026-07-10 FFT1541 - Jul 10, 02:35 UTCJul 10, 04:35 UTC2h 0m
2026-07-10 FFT3272 - Jul 10, 00:05 UTCJul 10, 01:15 UTC1h 10m
2026-07-10 FFT3272 MYR → PHL Jul 10, 00:14 UTCJul 10, 01:13 UTC59m
2026-07-09 FFT1681 - Jul 9, 19:30 UTCJul 9, 20:50 UTC1h 20m
2026-07-09 FFT1682 MYR → ISP Jul 9, 17:13 UTCJul 9, 18:04 UTC51m
2026-07-09 FFT1682 - Jul 9, 16:55 UTCJul 9, 18:05 UTC1h 10m
2026-07-09 FFT3271 - Jul 9, 14:15 UTCJul 9, 15:20 UTC1h 5m
2026-07-09 FFT3271 - Jul 9, 13:55 UTCJul 9, 14:00 UTC5m
2026-07-09 FFT2506 MCO → PHL Jul 9, 10:30 UTCJul 9, 12:30 UTC2h 0m
2026-07-09 FFT4192 DFW → MCO Jul 9, 02:15 UTCJul 9, 04:35 UTC2h 20m
2026-07-09 FFT4192 DFW → MCO Jul 9, 01:20 UTCJul 9, 04:30 UTC3h 10m
2026-07-08 FFT4993 MSY → DFW Jul 8, 19:45 UTCJul 8, 21:00 UTC1h 15m
2026-07-08 FFT4994 - Jul 8, 17:10 UTCJul 8, 18:25 UTC1h 15m
2026-07-08 FFT2219 - Jul 8, 10:40 UTCJul 8, 15:10 UTC4h 30m
2026-07-08 FFT2220 - Jul 8, 08:35 UTCJul 8, 08:50 UTC15m
2026-07-08 FFT2220 - Jul 8, 04:35 UTCJul 8, 07:05 UTC2h 30m
2026-07-08 FFT3175 - Jul 8, 00:35 UTCJul 8, 02:40 UTC2h 5m
2026-07-07 FFT3990 SAN → DFW Jul 7, 19:40 UTCJul 7, 21:50 UTC2h 10m
2026-07-07 FFT3366 DEN → DFW Jul 7, 16:30 UTCJul 7, 18:00 UTC1h 30m
2026-07-07 FFT3666 SMF → DEN Jul 7, 00:05 UTCJul 7, 02:00 UTC1h 55m
2026-07-06 FFT3665 DEN → SMF Jul 6, 21:05 UTCJul 6, 23:05 UTC2h 0m
2026-07-06 FFT3665 DEN → SMF Jul 6, 21:13 UTCJul 6, 23:00 UTC1h 47m
2026-07-06 FFT3220 SLC → DEN Jul 6, 18:45 UTCJul 6, 19:45 UTC1h 0m

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 N329FR page for operator, model, and routing details .

Mode-S A3904C frequently asked

What is Mode-S code A3904C?
A3904C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N329FR.
Where is Mode-S A3904C registered?
Mode-S code A3904C 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 A3904C broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3904C, octal 50710114, decimal 10,719,308.
What flights does A3904C operate?
Mode-S A3904C has broadcast 20 distinct callsigns, including FFT3871, FFT2526, FFT4685, FFT3923, FFT3872.