Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A54B2A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N440FR · operated by FRONTIER AIRLINES INC.

Hex
A54B2A
Octal
51245452
Decimal
10,832,682
Country
US
Tail
N440FR
Broadcasting now · callsign FFT1102 · 675 ft
Flights observed
120
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

A54B2A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A54B2A 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
FFT3306 Frontier Airlines 4 2026-06-03
FFT4725 Frontier Airlines 3 2026-06-03
FFT3371 Frontier Airlines 3 2026-05-15
FFT2250 Frontier Airlines 3 2026-06-01
FFT1668 Frontier Airlines 3 2026-05-15
FFT1303 Frontier Airlines 3 2026-05-15
FFT1241 Frontier Airlines 3 2026-06-12
FFT67 Frontier Airlines 2 2026-05-27
FFT4455 Frontier Airlines 2 2026-06-19
FFT3976 Frontier Airlines 2 2026-06-06
FFT3782 Frontier Airlines 2 2026-05-20
FFT3560 Frontier Airlines 2 2026-06-06
FFT3559 Frontier Airlines 2 2026-06-06
FFT3378 Frontier Airlines 2 2026-05-30
FFT3305 Frontier Airlines 2 2026-06-03
FFT2940 Frontier Airlines 2 2026-05-24
FFT2797 Frontier Airlines 2 2026-05-21
FFT2730 Frontier Airlines 2 2026-05-15
FFT2443 Frontier Airlines 2 2026-05-27
FFT2284 Frontier Airlines 2 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-19 FFT1147 SJU → BDL Jun 19, 20:59 UTCJun 19, 22:45 UTC1h 45m
2026-06-19 FFT2932 SFO → LAS Jun 19, 16:25 UTCJun 19, 18:39 UTC2h 15m
2026-06-19 FFT4455 PHL → FLL Jun 19, 12:25 UTCJun 19, 14:39 UTC2h 15m
2026-06-19 FFT4455 PHL → FLL Jun 19, 12:16 UTCJun 19, 14:34 UTC2h 18m
2026-06-19 FFT1102 - Jun 19, 03:44 UTCJun 19, 05:14 UTC1h 30m
2026-06-12 FFT1241 MCO → ATL Jun 12, 14:30 UTCJun 12, 15:30 UTC1h 0m
2026-06-11 FFT1097 ISP → MCO Jun 11, 18:10 UTCJun 11, 19:05 UTC55m
2026-06-11 FFT1098 MCO → BQN Jun 11, 12:50 UTCJun 11, 13:30 UTC40m
2026-06-11 FFT1098 MCO → BQN Jun 11, 12:53 UTCJun 11, 15:00 UTC2h 7m
2026-06-09 FFT4837 MCO → IND Jun 9, 19:50 UTCJun 9, 21:00 UTC1h 10m
2026-06-09 FFT2511 GRR → TPA Jun 9, 16:45 UTCJun 9, 17:45 UTC1h 0m
2026-06-09 FFT2512 MCO → EWR Jun 9, 11:50 UTCJun 9, 14:00 UTC2h 10m
2026-06-09 FFT1750 CVG → MCO Jun 9, 01:40 UTCJun 9, 03:20 UTC1h 40m
2026-06-08 FFT1477 FLL → CVG Jun 8, 21:55 UTCJun 9, 00:00 UTC2h 5m
2026-06-08 FFT1047 CVG → FLL Jun 8, 18:45 UTCJun 8, 20:50 UTC2h 5m
2026-06-08 FFT1565 MCO → CVG Jun 8, 15:50 UTCJun 8, 17:35 UTC1h 45m
2026-06-08 FFT1056 CLE → MCO Jun 8, 12:55 UTCJun 8, 14:45 UTC1h 50m
2026-06-08 FFT1915 MCO → CLE Jun 8, 09:25 UTCJun 8, 11:30 UTC2h 5m
2026-06-07 FFT1555 CLT → MCO Jun 7, 17:30 UTCJun 7, 18:35 UTC1h 5m
2026-06-07 FFT1446 MCO → CLT Jun 7, 14:31 UTCJun 7, 15:38 UTC1h 7m
2026-06-07 FFT1446 MCO → CLT Jun 7, 14:25 UTCJun 7, 15:45 UTC1h 20m
2026-06-06 FFT3560 BNA → MCO Jun 6, 22:10 UTCJun 6, 23:35 UTC1h 25m
2026-06-06 FFT3559 MCO → BNA Jun 6, 19:24 UTCJun 6, 21:00 UTC1h 35m
2026-06-06 FFT3976 ATL → MCO Jun 6, 17:05 UTCJun 6, 18:09 UTC1h 5m
2026-06-06 FFT1241 MCO → ATL Jun 6, 14:14 UTCJun 6, 15:15 UTC1h 0m
2026-06-06 FFT1039 RDU → MCO Jun 6, 00:10 UTCJun 6, 01:25 UTC1h 15m
2026-06-05 FFT1234 MCO → RDU Jun 5, 21:30 UTCJun 5, 22:50 UTC1h 20m
2026-06-05 FFT3762 ATL → MDW Jun 5, 18:00 UTCJun 5, 19:50 UTC1h 50m
2026-06-05 FFT1539 MCO → IND Jun 5, 14:45 UTCJun 5, 16:45 UTC2h 0m
2026-06-05 FFT1714 CVG → MCO Jun 5, 11:15 UTCJun 5, 13:00 UTC1h 45m
2026-06-05 FFT1714 CVG → MCO Jun 5, 11:15 UTCJun 5, 12:57 UTC1h 42m
2026-06-05 FFT2547 MCO → CVG Jun 5, 02:00 UTCJun 5, 03:45 UTC1h 45m
2026-06-04 FFT3560 BNA → MCO Jun 4, 22:10 UTCJun 4, 23:35 UTC1h 25m
2026-06-04 FFT3559 MCO → BNA Jun 4, 19:15 UTCJun 4, 20:50 UTC1h 35m
2026-06-04 FFT3976 ATL → MCO Jun 4, 16:50 UTCJun 4, 17:55 UTC1h 5m
2026-06-04 FFT1241 MCO → ATL Jun 4, 14:05 UTCJun 4, 15:10 UTC1h 5m
2026-06-03 FFT4725 SJU → MCO Jun 3, 22:00 UTCJun 3, 22:45 UTC45m
2026-06-03 FFT4725 SJU → MCO Jun 3, 20:00 UTCJun 3, 20:10 UTC10m
2026-06-03 FFT3306 JAX → SJU Jun 3, 18:00 UTCJun 3, 18:35 UTC35m
2026-06-03 FFT3306 JAX → SJU Jun 3, 15:40 UTCJun 3, 16:30 UTC50m
2026-06-03 FFT3305 SJU → JAX Jun 3, 11:10 UTCJun 3, 14:10 UTC3h 0m
2026-06-01 FFT2250 ATL → BDL Jun 1, 16:40 UTCJun 1, 17:05 UTC25m
2026-06-01 FFT2250 ATL → BDL Jun 1, 14:40 UTCJun 1, 15:15 UTC35m
2026-06-01 FFT2250 ATL → BDL Jun 1, 14:34 UTCJun 1, 17:00 UTC2h 26m
2026-05-31 FFT4725 SJU → MCO May 31, 20:45 UTCMay 31, 23:25 UTC2h 40m
2026-05-31 FFT3306 JAX → SJU May 31, 15:35 UTCMay 31, 18:10 UTC2h 35m
2026-05-31 FFT3306 JAX → SJU May 31, 15:41 UTCMay 31, 18:14 UTC2h 33m
2026-05-31 FFT3305 SJU → JAX May 31, 11:05 UTCMay 31, 14:05 UTC3h 0m
2026-05-30 FFT2695 BWI → DFW May 30, 22:55 UTCMay 30, 23:10 UTC15m
2026-05-30 FFT3004 CLT → SJU May 30, 17:50 UTCMay 30, 20:50 UTC3h 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 N440FR page for operator, model, and routing details .

Mode-S A54B2A frequently asked

What is Mode-S code A54B2A?
A54B2A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N440FR.
Where is Mode-S A54B2A registered?
Mode-S code A54B2A 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 A54B2A broadcasting right now?
Yes. Mode-S A54B2A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54B2A, octal 51245452, decimal 10,832,682.
What flights does A54B2A operate?
Mode-S A54B2A has broadcast 20 distinct callsigns, including FFT3306, FFT4725, FFT3371, FFT2250, FFT1668.