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
496
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:35 UTC

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
FFT2265 Frontier Airlines 8 2026-07-26
FFT44 Frontier Airlines 6 2026-07-24
FFT316 - 6 2026-07-13
FFT2791 Frontier Airlines 6 2026-07-25
FFT87 Frontier Airlines 5 2026-07-24
FFT71 - 5 2026-07-13
FFT3206 - 5 2026-07-13
FFT2695 Frontier Airlines 5 2026-07-26
FFT2636 Frontier Airlines 5 2026-07-24
FFT4807 - 4 2026-04-13
FFT4702 - 4 2026-07-22
FFT4347 - 4 2026-07-01
FFT3346 Frontier Airlines 4 2026-07-25
FFT3287 - 4 2026-07-03
FFT2871 Frontier Airlines 4 2026-06-10
FFT2698 - 4 2026-07-15
FFT2697 - 4 2026-07-16
FFT2607 - 4 2026-07-04
FFT2538 - 4 2026-06-27
FFT2206 - 4 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FFT1774 BWI → SJU Jul 26, 20:15 UTCJul 26, 20:35 UTC20m
2026-07-26 FFT1774 BWI → SJU Jul 26, 17:05 UTCJul 26, 18:30 UTC1h 25m
2026-07-26 FFT2265 ATL → TPA Jul 26, 13:45 UTCJul 26, 15:35 UTC1h 50m
2026-07-26 FFT2265 ATL → TPA Jul 26, 11:55 UTCJul 26, 12:05 UTC10m
2026-07-26 FFT1726 PHL → SJU Jul 26, 03:45 UTCJul 26, 07:30 UTC3h 46m
2026-07-26 FFT2695 BWI → DFW Jul 26, 00:15 UTCJul 26, 02:00 UTC1h 45m
2026-07-25 FFT2695 BWI → DFW Jul 25, 22:30 UTCJul 25, 22:40 UTC10m
2026-07-25 FFT2695 BWI → DFW Jul 25, 22:15 UTCJul 26, 01:57 UTC3h 42m
2026-07-25 FFT1774 BWI → SJU Jul 25, 20:35 UTCJul 25, 20:55 UTC20m
2026-07-25 FFT1774 BWI → SJU Jul 25, 17:20 UTCJul 25, 18:30 UTC1h 10m
2026-07-25 FFT2265 ATL → TPA Jul 25, 14:10 UTCJul 25, 15:20 UTC1h 10m
2026-07-25 FFT2265 ATL → TPA Jul 25, 11:50 UTCJul 25, 12:05 UTC15m
2026-07-25 FFT3346 CLE → MCO Jul 25, 10:00 UTCJul 25, 10:15 UTC15m
2026-07-25 FFT3346 CLE → MCO Jul 25, 06:00 UTCJul 25, 08:25 UTC2h 25m
2026-07-25 FFT2791 PHX → SFO Jul 25, 01:25 UTCJul 25, 04:00 UTC2h 35m
2026-07-25 FFT2791 PHX → SFO Jul 25, 01:12 UTCJul 25, 03:53 UTC2h 41m
2026-07-24 FFT2636 STL → MCO Jul 24, 21:20 UTCJul 24, 23:30 UTC2h 10m
2026-07-24 FFT87 SJO → DEN Jul 24, 16:10 UTCJul 24, 18:55 UTC2h 45m
2026-07-24 FFT44 MCO → ORD Jul 24, 11:20 UTCJul 24, 14:15 UTC2h 55m
2026-07-24 FFT3136 IAH → ORD Jul 24, 03:05 UTCJul 24, 05:00 UTC1h 55m
2026-07-23 FFT3135 ORD → IAH Jul 23, 23:00 UTCJul 24, 01:20 UTC2h 20m
2026-07-23 FFT1342 DFW → ORD Jul 23, 18:45 UTCJul 23, 20:40 UTC1h 55m
2026-07-23 FFT3241 PHL → PBI Jul 23, 14:45 UTCJul 23, 16:30 UTC1h 45m
2026-07-23 FFT3241 PHL → PBI Jul 23, 14:43 UTCJul 23, 16:29 UTC1h 46m
2026-07-23 FFT1441 ATL → ORD Jul 23, 10:50 UTCJul 23, 12:30 UTC1h 40m
2026-07-22 FFT4702 - Jul 22, 21:45 UTCJul 22, 23:35 UTC1h 50m
2026-07-22 FFT4211 - Jul 22, 18:35 UTCJul 22, 20:20 UTC1h 45m
2026-07-22 FFT1404 IAH → ATL Jul 22, 15:20 UTCJul 22, 16:55 UTC1h 35m
2026-07-22 FFT4075 ATL → IAH Jul 22, 03:35 UTCJul 22, 05:05 UTC1h 30m
2026-07-21 FFT4209 CLE → ATL Jul 21, 22:45 UTCJul 22, 00:35 UTC1h 50m
2026-07-21 FFT4209 CLE → ATL Jul 21, 22:50 UTCJul 22, 00:34 UTC1h 44m
2026-07-21 FFT206 CUN → CLE Jul 21, 15:20 UTCJul 21, 18:30 UTC3h 10m
2026-07-21 FFT207 - Jul 21, 10:30 UTCJul 21, 13:40 UTC3h 10m
2026-07-21 FFT2184 TPA → CLE Jul 21, 02:40 UTCJul 21, 04:45 UTC2h 5m
2026-07-20 FFT1491 CLE → TPA Jul 20, 23:20 UTCJul 21, 01:20 UTC1h 59m
2026-07-20 FFT1491 CLE → TPA Jul 20, 23:18 UTCJul 21, 01:17 UTC1h 59m
2026-07-20 FFT3073 - Jul 20, 20:45 UTCJul 20, 21:50 UTC1h 5m
2026-07-20 FFT3074 - Jul 20, 18:15 UTCJul 20, 19:20 UTC1h 5m
2026-07-20 FFT2684 TPA → CLE Jul 20, 14:30 UTCJul 20, 16:40 UTC2h 10m
2026-07-20 FFT3679 - Jul 20, 10:35 UTCJul 20, 12:30 UTC1h 55m
2026-07-20 FFT3451 - Jul 20, 00:30 UTCJul 20, 02:45 UTC2h 15m
2026-07-19 FFT3452 CLE → FLL Jul 19, 20:30 UTCJul 19, 23:00 UTC2h 30m
2026-07-19 FFT1045 PPM → CLE Jul 19, 16:00 UTCJul 19, 18:30 UTC2h 30m
2026-07-19 FFT1045 FLL → CLE Jul 19, 15:47 UTCJul 19, 18:25 UTC2h 38m
2026-07-19 FFT1046 - Jul 19, 12:00 UTCJul 19, 14:20 UTC2h 20m
2026-07-19 FFT3451 PPM → CLE Jul 19, 00:25 UTCJul 19, 02:45 UTC2h 20m
2026-07-18 FFT3452 - Jul 18, 20:35 UTCJul 18, 23:15 UTC2h 40m
2026-07-18 FFT1045 - Jul 18, 16:10 UTCJul 18, 18:30 UTC2h 20m
2026-07-18 FFT1046 - Jul 18, 12:00 UTCJul 18, 14:25 UTC2h 25m
2026-07-18 FFT3232 LAS → CLE Jul 18, 02:00 UTCJul 18, 04:00 UTC2h 1m

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 FFT2265, FFT44, FFT316, FFT2791, FFT87.