Apparatus

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sensors Mode-S transponder

A8584A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N637FR · operated by BANK OF UTAH TRUSTEE

Hex
A8584A
Octal
52054112
Decimal
11,032,650
Country
US
Tail
N637FR
Type
A21N
Broadcasting now · callsign FFT4978 · 31,925 ft
Flights observed
393
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Current position

A8584A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A8584A 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
FFT2836 - 7 2026-07-03
FFT317 Frontier Airlines 6 2026-06-11
FFT2609 - 6 2026-06-25
FFT2269 - 6 2026-07-02
FFT1984 - 6 2026-06-25
FFT2388 Frontier Airlines 5 2026-06-25
FFT1417 - 5 2026-06-28
FFT72 Frontier Airlines 4 2026-05-29
FFT4455 - 4 2026-06-24
FFT3346 - 4 2026-07-06
FFT3227 Frontier Airlines 4 2026-06-11
FFT2932 - 4 2026-06-24
FFT2667 - 4 2026-07-12
FFT239 Frontier Airlines 4 2026-07-06
FFT2025 Frontier Airlines 4 2026-06-25
FFT181 - 4 2026-07-02
FFT86 Frontier Airlines 3 2026-06-01
FFT4304 Frontier Airlines 3 2026-06-26
FFT3916 - 3 2026-07-12
FFT3311 Frontier Airlines 3 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 FFT3469 - Jul 13, 22:35 UTCJul 14, 00:35 UTC2h 0m
2026-07-13 FFT2769 - Jul 13, 16:45 UTCJul 13, 19:05 UTC2h 20m
2026-07-13 FFT2769 BDL → MCO Jul 13, 16:40 UTCJul 13, 19:05 UTC2h 25m
2026-07-13 FFT1684 MCO → BDL Jul 13, 12:55 UTCJul 13, 15:20 UTC2h 25m
2026-07-13 FFT1684 MCO → BDL Jul 13, 13:01 UTCJul 13, 15:19 UTC2h 18m
2026-07-13 FFT2287 ORF → MCO Jul 13, 02:30 UTCJul 13, 04:00 UTC1h 30m
2026-07-12 FFT2288 MCO → ORF Jul 12, 23:55 UTCJul 13, 01:25 UTC1h 30m
2026-07-12 FFT3916 - Jul 12, 19:35 UTCJul 12, 21:35 UTC2h 0m
2026-07-12 FFT2667 - Jul 12, 15:15 UTCJul 12, 17:10 UTC1h 55m
2026-07-12 FFT3273 - Jul 12, 11:01 UTCJul 12, 12:45 UTC1h 45m
2026-07-12 FFT2310 MCO → BWI Jul 12, 02:20 UTCJul 12, 04:05 UTC1h 45m
2026-07-11 FFT9637 MCO → MCO Jul 11, 22:55 UTCJul 11, 23:50 UTC55m
2026-07-08 FFT9137 - Jul 8, 18:35 UTCJul 8, 20:45 UTC2h 10m
2026-07-07 FFT7007 - Jul 7, 18:05 UTCJul 7, 18:35 UTC30m
2026-07-06 FFT239 BNA → DEN Jul 6, 13:35 UTCJul 6, 13:45 UTC10m
2026-07-06 FFT239 BNA → DEN Jul 6, 13:35 UTCJul 6, 13:59 UTC24m
2026-07-06 FFT3346 - Jul 6, 11:05 UTCJul 6, 11:25 UTC20m
2026-07-06 FFT3346 - Jul 6, 07:05 UTCJul 6, 09:35 UTC2h 30m
2026-07-06 FFT3345 - Jul 6, 02:15 UTCJul 6, 04:55 UTC2h 40m
2026-07-06 FFT3345 - Jul 6, 00:20 UTCJul 6, 00:35 UTC15m
2026-07-05 FFT4420 - Jul 5, 18:10 UTCJul 5, 21:45 UTC3h 35m
2026-07-05 FFT3937 SJU → BDL Jul 5, 15:35 UTCJul 5, 16:45 UTC1h 10m
2026-07-05 FFT3937 SJU → BDL Jul 5, 13:00 UTCJul 5, 13:15 UTC15m
2026-07-05 FFT2216 - Jul 5, 04:05 UTCJul 5, 04:20 UTC15m
2026-07-05 FFT2216 - Jul 5, 01:40 UTCJul 5, 02:30 UTC50m
2026-07-04 FFT2215 SJU → TPA Jul 4, 23:15 UTCJul 5, 00:00 UTC45m
2026-07-04 FFT2215 SJU → TPA Jul 4, 21:30 UTCJul 4, 21:45 UTC15m
2026-07-04 FFT3018 - Jul 4, 19:30 UTCJul 4, 19:45 UTC15m
2026-07-04 FFT3018 - Jul 4, 17:35 UTCJul 4, 18:00 UTC25m
2026-07-04 FFT3018 FLL → SJU Jul 4, 17:23 UTCJul 4, 19:43 UTC2h 20m
2026-07-04 FFT2205 - Jul 4, 13:10 UTCJul 4, 15:45 UTC2h 35m
2026-07-04 FFT2446 - Jul 4, 07:20 UTCJul 4, 10:55 UTC3h 35m
2026-07-03 FFT2749 - Jul 3, 23:45 UTCJul 4, 04:55 UTC5h 10m
2026-07-03 FFT23 PUJ → PHL Jul 3, 17:44 UTCJul 3, 21:34 UTC3h 50m
2026-07-03 FFT23 - Jul 3, 12:25 UTCJul 3, 21:35 UTC9h 10m
2026-07-03 FFT2836 - Jul 3, 02:50 UTCJul 3, 04:55 UTC2h 5m
2026-07-02 FFT2269 - Jul 2, 22:55 UTCJul 3, 01:05 UTC2h 10m
2026-07-02 FFT180 - Jul 2, 19:00 UTCJul 2, 19:55 UTC55m
2026-07-02 FFT181 - Jul 2, 11:30 UTCJul 2, 12:10 UTC40m
2026-07-01 FFT23 - Jul 1, 20:00 UTCJul 1, 20:40 UTC40m
2026-07-01 FFT22 - Jul 1, 12:10 UTCJul 1, 12:45 UTC35m
2026-07-01 FFT22 PHL → PUJ Jul 1, 12:13 UTCJul 1, 15:25 UTC3h 12m
2026-07-01 FFT1602 - Jul 1, 05:55 UTCJul 1, 10:10 UTC4h 15m
2026-07-01 FFT3449 - Jul 1, 02:10 UTCJul 1, 03:40 UTC1h 30m
2026-06-30 FFT3450 - Jun 30, 23:35 UTCJul 1, 00:50 UTC1h 15m
2026-06-30 FFT2575 SLC → LAS Jun 30, 20:25 UTCJun 30, 21:25 UTC1h 0m
2026-06-30 FFT1268 LAX → SLC Jun 30, 17:35 UTCJun 30, 19:00 UTC1h 25m
2026-06-30 FFT3291 LAS → LAX Jun 30, 15:45 UTCJun 30, 16:45 UTC1h 0m
2026-06-30 FFT1106 PDX → LAS Jun 30, 03:45 UTCJun 30, 05:30 UTC1h 45m
2026-06-30 FFT1105 LAS → PDX Jun 30, 00:45 UTCJun 30, 02:35 UTC1h 51m

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 N637FR page for operator, model, and routing details .

Mode-S A8584A frequently asked

What is Mode-S code A8584A?
A8584A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N637FR.
Where is Mode-S A8584A registered?
Mode-S code A8584A 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 A8584A broadcasting right now?
Yes. Mode-S A8584A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8584A, octal 52054112, decimal 11,032,650.
What flights does A8584A operate?
Mode-S A8584A has broadcast 20 distinct callsigns, including FFT2836, FFT317, FFT2609, FFT2269, FFT1984.