Apparatus

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sensors Mode-S transponder

A85FB8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N639FR · AIRBUS A-321neo · operated by BANK OF UTAH TRUSTEE

Hex
A85FB8
Octal
52057670
Decimal
11,034,552
Country
US
Tail
N639FR
Type
A21N
Transponder active on ground
Flights observed
430
Distinct callsigns
20
Country
US
Last broadcast
16m ago

Last known position

Most recent position reported by Mode-S A85FB8.

Country allocation

The ICAO 24-bit address A85FB8 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
FFT316 - 6 2026-07-13
FFT71 - 5 2026-07-13
FFT44 - 5 2026-06-26
FFT3206 - 5 2026-07-13
FFT87 Frontier Airlines 4 2026-06-26
FFT4807 - 4 2026-04-13
FFT4347 - 4 2026-07-01
FFT3287 - 4 2026-07-03
FFT2871 Frontier Airlines 4 2026-06-10
FFT2791 - 4 2026-06-27
FFT2636 - 4 2026-06-26
FFT2607 - 4 2026-07-04
FFT2538 - 4 2026-06-27
FFT2265 - 4 2026-06-30
FFT2206 - 4 2026-06-30
FFT2174 Frontier Airlines 4 2026-06-05
FFT1166 Frontier Airlines 4 2026-06-29
FFT4827 - 3 2026-07-08
FFT4702 Frontier Airlines 3 2026-06-06
FFT4639 Frontier Airlines 3 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 FFT2070 - Jul 15, 00:20 UTCJul 15, 01:35 UTC1h 15m
2026-07-14 FFT2069 LAS → SMF Jul 14, 22:05 UTCJul 14, 23:05 UTC59m
2026-07-14 FFT4967 DEN → LAS Jul 14, 19:00 UTCJul 14, 20:20 UTC1h 20m
2026-07-13 FFT71 - Jul 13, 22:15 UTCJul 14, 01:45 UTC3h 30m
2026-07-13 FFT316 - Jul 13, 18:55 UTCJul 13, 20:45 UTC1h 50m
2026-07-13 FFT3206 - Jul 13, 13:10 UTCJul 13, 15:00 UTC1h 50m
2026-07-12 FFT71 CUN → DEN Jul 12, 20:45 UTCJul 13, 00:30 UTC3h 45m
2026-07-12 FFT316 - Jul 12, 17:05 UTCJul 12, 18:55 UTC1h 50m
2026-07-12 FFT3206 - Jul 12, 13:05 UTCJul 12, 14:55 UTC1h 50m
2026-07-12 FFT1361 - Jul 12, 02:20 UTCJul 12, 05:20 UTC3h 0m
2026-07-11 FFT1362 - Jul 11, 22:01 UTCJul 12, 00:35 UTC2h 35m
2026-07-11 FFT1362 DEN → CLT Jul 11, 22:05 UTCJul 12, 00:36 UTC2h 31m
2026-07-11 FFT3199 MSP → DEN Jul 11, 18:20 UTCJul 11, 19:50 UTC1h 30m
2026-07-11 FFT1150 DEN → MSP Jul 11, 15:25 UTCJul 11, 16:55 UTC1h 30m
2026-07-11 FFT1279 - Jul 11, 10:10 UTCJul 11, 13:40 UTC3h 30m
2026-07-11 FFT1665 BWI → MIA Jul 11, 00:05 UTCJul 11, 02:20 UTC2h 15m
2026-07-10 FFT2940 - Jul 10, 20:00 UTCJul 10, 22:45 UTC2h 45m
2026-07-10 FFT67 - Jul 10, 12:10 UTCJul 10, 17:45 UTC5h 35m
2026-07-10 FFT1280 - Jul 10, 06:05 UTCJul 10, 09:30 UTC3h 25m
2026-07-09 FFT3227 - Jul 9, 23:35 UTCJul 10, 02:05 UTC2h 30m
2026-07-09 FFT317 - Jul 9, 19:10 UTCJul 9, 21:00 UTC1h 50m
2026-07-09 FFT70 DEN → CUN Jul 9, 14:15 UTCJul 9, 17:40 UTC3h 25m
2026-07-08 FFT3227 - Jul 8, 23:45 UTCJul 9, 02:10 UTC2h 25m
2026-07-08 FFT317 - Jul 8, 19:05 UTCJul 8, 20:55 UTC1h 50m
2026-07-08 FFT70 DEN → CUN Jul 8, 14:00 UTCJul 8, 17:30 UTC3h 30m
2026-07-08 FFT4827 - Jul 8, 01:20 UTCJul 8, 01:50 UTC30m
2026-07-07 FFT4827 - Jul 7, 23:50 UTCJul 8, 01:50 UTC2h 0m
2026-07-07 FFT4827 MCI → DEN Jul 7, 23:18 UTCJul 8, 01:05 UTC1h 47m
2026-07-07 FFT8701 - Jul 7, 18:15 UTCJul 7, 20:10 UTC1h 55m
2026-07-07 FFT8701 SLC → MCI Jul 7, 18:12 UTCJul 7, 20:10 UTC1h 58m
2026-07-07 FFT4235 DEN → SLC Jul 7, 15:00 UTCJul 7, 16:05 UTC1h 5m
2026-07-07 FFT3220 SLC → DEN Jul 7, 12:20 UTCJul 7, 13:15 UTC55m
2026-07-07 FFT4251 DEN → SLC Jul 7, 04:25 UTCJul 7, 05:35 UTC1h 10m
2026-07-06 FFT71 CUN → DEN Jul 6, 21:00 UTCJul 7, 00:45 UTC3h 45m
2026-07-06 FFT316 - Jul 6, 17:10 UTCJul 6, 18:55 UTC1h 45m
2026-07-06 FFT3206 - Jul 6, 13:10 UTCJul 6, 15:00 UTC1h 50m
2026-07-05 FFT71 CUN → DEN Jul 5, 20:45 UTCJul 6, 00:20 UTC3h 35m
2026-07-05 FFT316 - Jul 5, 17:00 UTCJul 5, 18:50 UTC1h 50m
2026-07-05 FFT316 IAH → CUN Jul 5, 17:02 UTCJul 5, 18:47 UTC1h 45m
2026-07-05 FFT3206 - Jul 5, 13:10 UTCJul 5, 15:10 UTC2h 0m
2026-07-05 FFT2016 LAS → DEN Jul 5, 08:05 UTCJul 5, 09:30 UTC1h 25m
2026-07-05 FFT4113 PHX → LAS Jul 5, 05:30 UTCJul 5, 06:10 UTC40m
2026-07-05 FFT4671 - Jul 5, 00:25 UTCJul 5, 04:00 UTC3h 35m
2026-07-05 FFT4671 DTW → PHX Jul 5, 00:12 UTCJul 5, 03:49 UTC3h 37m
2026-07-04 FFT1958 - Jul 4, 20:05 UTCJul 4, 22:25 UTC2h 20m
2026-07-04 FFT4184 PHX → IAH Jul 4, 16:28 UTCJul 4, 18:25 UTC1h 57m
2026-07-04 FFT4184 - Jul 4, 16:25 UTCJul 4, 18:25 UTC2h 0m
2026-07-04 FFT2607 - Jul 4, 02:40 UTCJul 4, 06:05 UTC3h 25m
2026-07-03 FFT1846 PHX → DTW Jul 3, 23:15 UTCJul 4, 00:15 UTC1h 0m
2026-07-03 FFT4771 ATL → CVG Jul 3, 15:45 UTCJul 3, 16:40 UTC55m

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 N639FR page for operator, model, and routing details .

Mode-S A85FB8 frequently asked

What is Mode-S code A85FB8?
A85FB8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N639FR.
Where is Mode-S A85FB8 registered?
Mode-S code A85FB8 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 A85FB8 broadcasting right now?
Mode-S A85FB8 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A85FB8, octal 52057670, decimal 11,034,552.
What flights does A85FB8 operate?
Mode-S A85FB8 has broadcast 20 distinct callsigns, including FFT316, FFT71, FFT44, FFT3206, FFT87.