Apparatus

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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
No current signal · last broadcast 15d ago
Flights observed
343
Distinct callsigns
20
Country
US
Last broadcast
15d ago

Last known position

Most recent position reported by Mode-S A54B2A.

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
FFT4725 - 5 2026-06-25
FFT3306 - 5 2026-06-25
FFT4771 Frontier Airlines 4 2026-07-19
FFT4242 Frontier Airlines 4 2026-07-26
FFT4241 Frontier Airlines 4 2026-07-26
FFT3378 - 4 2026-07-16
FFT3288 - 4 2026-07-13
FFT2899 Frontier Airlines 4 2026-07-23
FFT1846 Frontier Airlines 4 2026-07-19
FFT1158 Frontier Airlines 4 2026-07-23
FFT1157 Frontier Airlines 4 2026-07-24
FFT4707 - 3 2026-07-12
FFT4129 Frontier Airlines 3 2026-07-07
FFT4076 Frontier Airlines 3 2026-07-20
FFT3371 Frontier Airlines 3 2026-05-15
FFT3305 - 3 2026-06-25
FFT3287 - 3 2026-07-13
FFT2898 Frontier Airlines 3 2026-07-23
FFT2631 - 3 2026-07-04
FFT2297 Frontier Airlines 3 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FFT4505 MCI → LAS Jul 26, 21:45 UTCJul 26, 22:30 UTC45m
2026-07-26 FFT4506 LAS → MCI Jul 26, 17:55 UTCJul 26, 20:20 UTC2h 25m
2026-07-26 FFT2801 MCO → DEN Jul 26, 12:40 UTCJul 26, 16:25 UTC3h 45m
2026-07-26 FFT2802 DEN → MCO Jul 26, 07:15 UTCJul 26, 10:40 UTC3h 25m
2026-07-26 FFT4242 MIA → MDW Jul 26, 03:50 UTCJul 26, 04:50 UTC1h 0m
2026-07-26 FFT4241 MDW → MIA Jul 26, 01:40 UTCJul 26, 02:35 UTC55m
2026-07-25 FFT4158 SFO → LAS Jul 25, 23:05 UTCJul 26, 00:15 UTC1h 10m
2026-07-25 FFT3581 SNA → SFO Jul 25, 20:20 UTCJul 25, 21:15 UTC55m
2026-07-25 FFT1699 CVG → ATL Jul 25, 18:35 UTCJul 25, 19:15 UTC40m
2026-07-25 FFT4108 BUR → LAS Jul 25, 16:30 UTCJul 25, 17:15 UTC45m
2026-07-25 FFT4107 LAS → BUR Jul 25, 14:05 UTCJul 25, 14:50 UTC45m
2026-07-25 FFT3923 ATL → LAS Jul 25, 01:20 UTCJul 25, 04:55 UTC3h 35m
2026-07-24 FFT3046 MSP → ATL Jul 24, 21:30 UTCJul 24, 23:55 UTC2h 25m
2026-07-24 FFT3045 ATL → MSP Jul 24, 17:05 UTCJul 24, 19:35 UTC2h 30m
2026-07-24 FFT2297 PHL → FLL Jul 24, 13:10 UTCJul 24, 15:10 UTC2h 0m
2026-07-24 FFT1004 ATL → PHL Jul 24, 09:25 UTCJul 24, 11:00 UTC1h 35m
2026-07-24 FFT1157 ORD → MCO Jul 24, 03:00 UTCJul 24, 04:45 UTC1h 45m
2026-07-24 FFT1157 ORD → MCO Jul 24, 02:42 UTCJul 24, 04:44 UTC2h 2m
2026-07-23 FFT1158 ATL → EWR Jul 23, 23:20 UTCJul 24, 01:10 UTC1h 50m
2026-07-23 FFT2899 DTW → ATL Jul 23, 19:35 UTCJul 23, 21:05 UTC1h 30m
2026-07-23 FFT2898 ATL → DTW Jul 23, 16:40 UTCJul 23, 18:10 UTC1h 30m
2026-07-23 FFT2297 PHL → FLL Jul 23, 12:35 UTCJul 23, 14:10 UTC1h 35m
2026-07-23 FFT1004 ATL → PHL Jul 23, 09:30 UTCJul 23, 11:05 UTC1h 35m
2026-07-23 FFT1157 ORD → MCO Jul 23, 03:40 UTCJul 23, 05:25 UTC1h 45m
2026-07-23 FFT1158 ATL → EWR Jul 23, 00:40 UTCJul 23, 02:30 UTC1h 50m
2026-07-23 FFT1158 ATL → EWR Jul 23, 00:17 UTCJul 23, 02:24 UTC2h 7m
2026-07-22 FFT124 MBJ → ATL Jul 22, 20:00 UTCJul 22, 21:35 UTC1h 35m
2026-07-22 FFT124 MBJ → ATL Jul 22, 19:12 UTCJul 22, 21:33 UTC2h 21m
2026-07-22 FFT125 ATL → MBJ Jul 22, 15:41 UTCJul 22, 17:52 UTC2h 11m
2026-07-22 FFT125 ATL → MBJ Jul 22, 15:35 UTCJul 22, 17:00 UTC1h 25m
2026-07-22 FFT2292 MDW → ATL Jul 22, 11:20 UTCJul 22, 12:45 UTC1h 25m
2026-07-22 FFT2291 ATL → MDW Jul 22, 01:05 UTCJul 22, 03:00 UTC1h 55m
2026-07-21 FFT2972 MSY → ATL Jul 21, 22:20 UTCJul 21, 23:20 UTC1h 0m
2026-07-21 FFT1371 MDW → DFW Jul 21, 19:45 UTCJul 21, 20:55 UTC1h 10m
2026-07-21 FFT1123 - Jul 21, 16:15 UTCJul 21, 17:35 UTC1h 20m
2026-07-21 FFT1123 FLL → ATL Jul 21, 16:15 UTCJul 21, 17:33 UTC1h 18m
2026-07-21 FFT2177 - Jul 21, 13:05 UTCJul 21, 14:45 UTC1h 40m
2026-07-21 FFT1168 ATL → RDU Jul 21, 10:50 UTCJul 21, 11:45 UTC55m
2026-07-20 FFT3453 LGA → ATL Jul 20, 23:30 UTCJul 21, 01:10 UTC1h 39m
2026-07-20 FFT3454 - Jul 20, 19:45 UTCJul 20, 21:35 UTC1h 50m
2026-07-20 FFT4076 IAH → ATL Jul 20, 16:15 UTCJul 20, 17:50 UTC1h 35m
2026-07-20 FFT2399 ATL → IAH Jul 20, 12:55 UTCJul 20, 14:25 UTC1h 30m
2026-07-20 FFT3216 LAX → ATL Jul 20, 07:00 UTCJul 20, 11:10 UTC4h 10m
2026-07-20 FFT4082 SJC → LAX Jul 20, 04:20 UTCJul 20, 05:15 UTC55m
2026-07-20 FFT2457 PNS → DEN Jul 20, 01:45 UTCJul 20, 02:30 UTC45m
2026-07-20 FFT2457 PNS → DEN Jul 20, 01:23 UTCJul 20, 02:30 UTC1h 7m
2026-07-19 FFT3215 - Jul 19, 20:20 UTCJul 20, 00:25 UTC4h 5m
2026-07-19 FFT1846 PHX → DTW Jul 19, 16:30 UTCJul 19, 17:40 UTC1h 10m
2026-07-19 FFT4771 ATL → CVG Jul 19, 14:05 UTCJul 19, 15:00 UTC55m
2026-07-19 FFT4601 EWR → ATL Jul 19, 10:05 UTCJul 19, 11:50 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 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?
No active broadcast right now. Last signal was 15d ago.
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 FFT4725, FFT3306, FFT4771, FFT4242, FFT4241.