Apparatus

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sensors Mode-S transponder

A874A4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N644FR · AIRBUS A-321neo · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A874A4
Octal
52072244
Decimal
11,039,908
Country
US
Tail
N644FR
Type
A21N
Broadcasting now · callsign FFT3017 · 14,875 ft
Flights observed
400
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Current position

A874A4 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A874A4 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
FFT4440 Frontier Airlines 7 2026-07-26
FFT4353 Frontier Airlines 7 2026-07-25
FFT9444 Frontier Airlines 6 2026-06-04
FFT2265 - 6 2026-07-05
FFT2269 - 5 2026-07-09
FFT2082 - 5 2026-07-03
FFT1983 Frontier Airlines 5 2026-07-25
FFT44 Frontier Airlines 4 2026-05-31
FFT4173 - 4 2026-07-11
FFT3306 - 4 2026-07-04
FFT153 - 4 2026-06-24
FFT1178 - 4 2026-07-16
FFT87 Frontier Airlines 3 2026-05-31
FFT4420 - 3 2026-06-22
FFT4145 Frontier Airlines 3 2026-04-16
FFT3500 - 3 2026-07-02
FFT3499 - 3 2026-07-01
FFT3409 Frontier Airlines 3 2026-05-28
FFT33 - 3 2026-06-23
FFT3227 - 3 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FFT2505 PHL → MCO Jul 26, 22:55 UTCJul 26, 23:00 UTC5m
2026-07-26 FFT2932 SFO → LAS Jul 26, 17:50 UTCJul 26, 20:00 UTC2h 10m
2026-07-26 FFT2007 DTW → FLL Jul 26, 13:50 UTCJul 26, 16:05 UTC2h 15m
2026-07-26 FFT2021 PHL → DTW Jul 26, 10:35 UTCJul 26, 11:50 UTC1h 15m
2026-07-26 FFT4440 FLL → PHL Jul 26, 02:20 UTCJul 26, 04:30 UTC2h 10m
2026-07-25 FFT1983 ISP → FLL Jul 25, 23:25 UTCJul 26, 00:50 UTC1h 25m
2026-07-25 FFT4353 PHL → CLT Jul 25, 20:50 UTCJul 25, 22:00 UTC1h 10m
2026-07-25 FFT1644 RDU → PHL Jul 25, 17:00 UTCJul 25, 19:20 UTC2h 20m
2026-07-25 FFT4781 PHL → MSY Jul 25, 13:30 UTCJul 25, 16:00 UTC2h 30m
2026-07-25 FFT2112 ORD → PHL Jul 25, 02:45 UTCJul 25, 04:05 UTC1h 20m
2026-07-24 FFT2111 PHL → ORD Jul 24, 23:05 UTCJul 25, 01:00 UTC1h 55m
2026-07-24 FFT23 PUJ → PHL Jul 24, 16:34 UTCJul 24, 20:17 UTC3h 43m
2026-07-24 FFT23 PUJ → PHL Jul 24, 11:50 UTCJul 24, 20:10 UTC8h 20m
2026-07-24 FFT1602 SNA → LAS Jul 24, 05:35 UTCJul 24, 09:50 UTC4h 15m
2026-07-24 FFT1647 DFW → LAS Jul 24, 01:50 UTCJul 24, 04:00 UTC2h 10m
2026-07-23 FFT1052 LAS → DFW Jul 23, 21:55 UTCJul 24, 00:10 UTC2h 15m
2026-07-23 FFT4967 DEN → LAS Jul 23, 18:55 UTCJul 23, 20:20 UTC1h 25m
2026-07-23 FFT4968 LAS → DEN Jul 23, 16:05 UTCJul 23, 17:30 UTC1h 25m
2026-07-23 FFT2015 CLE → LAS Jul 23, 12:20 UTCJul 23, 13:45 UTC1h 25m
2026-07-23 FFT2015 CLE → LAS Jul 23, 12:23 UTCJul 23, 13:44 UTC1h 21m
2026-07-23 FFT1483 ORD → DEN Jul 23, 05:05 UTCJul 23, 07:25 UTC2h 20m
2026-07-23 FFT3174 CLE → PHL Jul 23, 01:15 UTCJul 23, 03:05 UTC1h 50m
2026-07-22 FFT1094 SFO → DEN Jul 22, 20:00 UTCJul 22, 23:05 UTC3h 5m
2026-07-22 FFT1229 DEN → SFO Jul 22, 16:25 UTCJul 22, 18:30 UTC2h 5m
2026-07-22 FFT1483 ORD → DEN Jul 22, 04:35 UTCJul 22, 05:25 UTC50m
2026-07-22 FFT3174 CLE → PHL Jul 22, 00:25 UTCJul 22, 02:20 UTC1h 55m
2026-07-21 FFT1094 SFO → DEN Jul 21, 20:45 UTCJul 21, 22:55 UTC2h 10m
2026-07-21 FFT1229 DEN → SFO Jul 21, 17:25 UTCJul 21, 19:00 UTC1h 35m
2026-07-21 FFT1229 DEN → SFO Jul 21, 17:18 UTCJul 21, 19:18 UTC2h 0m
2026-07-21 FFT3205 IAH → DEN Jul 21, 03:15 UTCJul 21, 05:05 UTC1h 50m
2026-07-21 FFT3228 DEN → IAH Jul 21, 00:10 UTCJul 21, 02:05 UTC1h 55m
2026-07-20 FFT3406 SEA → DEN Jul 20, 20:10 UTCJul 20, 22:20 UTC2h 10m
2026-07-20 FFT1175 PHL → MCO Jul 20, 15:20 UTCJul 20, 17:45 UTC2h 25m
2026-07-20 FFT3220 SLC → DEN Jul 20, 12:15 UTCJul 20, 13:15 UTC1h 0m
2026-07-20 FFT4251 DEN → SLC Jul 20, 04:40 UTCJul 20, 05:40 UTC1h 0m
2026-07-20 FFT4251 DEN → SLC Jul 20, 04:26 UTCJul 20, 05:37 UTC1h 11m
2026-07-19 FFT71 CUN → DEN Jul 19, 21:05 UTCJul 20, 00:25 UTC3h 20m
2026-07-19 FFT316 IAH → CUN Jul 19, 17:55 UTCJul 19, 19:40 UTC1h 45m
2026-07-19 FFT3206 DEN → IAH Jul 19, 13:10 UTCJul 19, 15:10 UTC2h 0m
2026-07-19 FFT3227 IAH → DEN Jul 19, 00:30 UTCJul 19, 02:20 UTC1h 50m
2026-07-18 FFT317 - Jul 18, 20:45 UTCJul 18, 21:00 UTC15m
2026-07-18 FFT317 CUN → IAH Jul 18, 20:36 UTCJul 18, 22:30 UTC1h 54m
2026-07-18 FFT70 DEN → CUN Jul 18, 15:40 UTCJul 18, 19:05 UTC3h 25m
2026-07-18 FFT1279 - Jul 18, 10:10 UTCJul 18, 13:30 UTC3h 20m
2026-07-18 FFT1279 MIA → DEN Jul 18, 10:13 UTCJul 18, 13:36 UTC3h 23m
2026-07-18 FFT1665 - Jul 18, 00:45 UTCJul 18, 02:50 UTC2h 6m
2026-07-17 FFT2940 - Jul 17, 20:44 UTCJul 17, 22:49 UTC2h 5m
2026-07-17 FFT67 - Jul 17, 12:10 UTCJul 17, 18:10 UTC6h 0m
2026-07-17 FFT1280 - Jul 17, 06:20 UTCJul 17, 09:45 UTC3h 25m
2026-07-17 FFT1176 SEA → DEN Jul 17, 02:25 UTCJul 17, 04:35 UTC2h 10m

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 N644FR page for operator, model, and routing details .

Mode-S A874A4 frequently asked

What is Mode-S code A874A4?
A874A4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N644FR.
Where is Mode-S A874A4 registered?
Mode-S code A874A4 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 A874A4 broadcasting right now?
Yes. Mode-S A874A4 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A874A4, octal 52072244, decimal 11,039,908.
What flights does A874A4 operate?
Mode-S A874A4 has broadcast 20 distinct callsigns, including FFT4440, FFT4353, FFT9444, FFT2265, FFT2269.