Apparatus

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sensors Mode-S transponder

A85C01

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N638FR · AIRBUS A-321neo · operated by BANK OF UTAH TRUSTEE

Hex
A85C01
Octal
52056001
Decimal
11,033,601
Country
US
Tail
N638FR
Type
A21N
Broadcasting now · callsign FFT3273 · 15,650 ft
Flights observed
532
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:25 UTC

Current position

A85C01 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A85C01 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
FFT2082 Frontier Airlines 9 2026-05-17
FFT1015 - 8 2026-07-15
FFT2871 Frontier Airlines 6 2026-05-16
FFT2791 Frontier Airlines 6 2026-07-26
FFT2529 Frontier Airlines 6 2026-07-25
FFT1016 Frontier Airlines 6 2026-05-16
FFT87 Frontier Airlines 5 2026-07-02
FFT7 - 5 2026-05-18
FFT4671 Frontier Airlines 5 2026-07-24
FFT44 - 5 2026-07-02
FFT3692 Frontier Airlines 5 2026-05-29
FFT3663 Frontier Airlines 5 2026-07-25
FFT3136 Frontier Airlines 5 2026-07-02
FFT2836 - 5 2026-07-13
FFT2675 Frontier Airlines 5 2026-06-08
FFT2636 - 5 2026-07-02
FFT2136 Frontier Airlines 5 2026-06-08
FFT1516 Frontier Airlines 5 2026-07-25
FFT1165 Frontier Airlines 5 2026-05-17
FFT4113 - 4 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FFT33 CLE → DEN Jul 26, 17:55 UTCJul 26, 20:25 UTC2h 30m
2026-07-26 FFT239 BNA → DEN Jul 26, 13:55 UTCJul 26, 14:05 UTC10m
2026-07-26 FFT3346 CLE → MCO Jul 26, 09:50 UTCJul 26, 10:05 UTC15m
2026-07-26 FFT3346 CLE → MCO Jul 26, 05:55 UTCJul 26, 08:10 UTC2h 16m
2026-07-26 FFT2791 PHX → SFO Jul 26, 01:20 UTCJul 26, 03:45 UTC2h 25m
2026-07-26 FFT2791 PHX → SFO Jul 26, 01:12 UTCJul 26, 03:44 UTC2h 32m
2026-07-25 FFT3663 BWI → MCO Jul 25, 19:35 UTCJul 25, 21:20 UTC1h 45m
2026-07-25 FFT1516 DTW → BWI Jul 25, 16:55 UTCJul 25, 17:55 UTC1h 0m
2026-07-25 FFT2529 MCO → DTW Jul 25, 13:20 UTCJul 25, 15:35 UTC2h 15m
2026-07-25 FFT1086 PHX → MCO Jul 25, 07:40 UTCJul 25, 11:30 UTC3h 50m
2026-07-24 FFT4671 DTW → PHX Jul 24, 23:50 UTCJul 25, 03:20 UTC3h 30m
2026-07-24 FFT1958 IAH → DTW Jul 24, 20:05 UTCJul 24, 22:20 UTC2h 15m
2026-07-24 FFT4184 PHX → IAH Jul 24, 16:20 UTCJul 24, 18:45 UTC2h 25m
2026-07-24 FFT4655 DFW → PHX Jul 24, 03:40 UTCJul 24, 05:30 UTC1h 50m
2026-07-24 FFT3972 PHX → DFW Jul 24, 00:15 UTCJul 24, 02:15 UTC2h 0m
2026-07-23 FFT1062 MCO → CVG Jul 23, 21:40 UTCJul 23, 22:55 UTC1h 15m
2026-07-23 FFT3303 PHX → LAX Jul 23, 19:05 UTCJul 23, 20:00 UTC55m
2026-07-23 FFT1085 MCO → PHX Jul 23, 13:55 UTCJul 23, 17:45 UTC3h 50m
2026-07-23 FFT4146 LAX → MCO Jul 23, 07:45 UTCJul 23, 12:10 UTC4h 25m
2026-07-23 FFT2858 SFO → LAX Jul 23, 05:10 UTCJul 23, 06:05 UTC55m
2026-07-22 FFT1447 ATL → SFO Jul 22, 23:05 UTCJul 23, 03:25 UTC4h 20m
2026-07-22 FFT4731 JFK → ATL Jul 22, 18:55 UTCJul 22, 20:40 UTC1h 45m
2026-07-22 FFT4732 ATL → JFK Jul 22, 14:55 UTCJul 22, 17:15 UTC2h 20m
2026-07-22 FFT2551 ATL → TPA Jul 22, 04:25 UTCJul 22, 12:25 UTC8h 0m
2026-07-22 FFT2505 PHL → MCO Jul 22, 00:35 UTCJul 22, 02:55 UTC2h 20m
2026-07-21 FFT2538 TPA → PHL Jul 21, 19:45 UTCJul 21, 22:00 UTC2h 15m
2026-07-21 FFT2538 TPA → PHL Jul 21, 19:20 UTCJul 21, 21:58 UTC2h 38m
2026-07-21 FFT4807 PHL → TPA Jul 21, 13:20 UTCJul 21, 15:45 UTC2h 25m
2026-07-21 FFT4807 PHL → TPA Jul 21, 13:16 UTCJul 21, 15:22 UTC2h 6m
2026-07-21 FFT1602 SNA → LAS Jul 21, 06:45 UTCJul 21, 11:15 UTC4h 30m
2026-07-21 FFT1647 DFW → LAS Jul 21, 01:50 UTCJul 21, 04:05 UTC2h 15m
2026-07-20 FFT1052 LAS → DFW Jul 20, 21:35 UTCJul 20, 23:55 UTC2h 20m
2026-07-20 FFT1052 LAS → DFW Jul 20, 21:35 UTCJul 20, 23:49 UTC2h 14m
2026-07-20 FFT1051 - Jul 20, 17:40 UTCJul 20, 19:50 UTC2h 10m
2026-07-20 FFT3978 - Jul 20, 13:30 UTCJul 20, 15:50 UTC2h 20m
2026-07-20 FFT2334 PHX → PHL Jul 20, 04:40 UTCJul 20, 05:25 UTC45m
2026-07-20 FFT2333 LAS → LAX Jul 20, 02:20 UTCJul 20, 03:00 UTC40m
2026-07-19 FFT2349 - Jul 19, 22:40 UTCJul 20, 00:05 UTC1h 25m
2026-07-19 FFT4919 MCO → DEN Jul 19, 17:25 UTCJul 19, 20:40 UTC3h 15m
2026-07-19 FFT4646 - Jul 19, 12:05 UTCJul 19, 15:15 UTC3h 10m
2026-07-18 FFT2142 PHX → DEN Jul 18, 23:55 UTCJul 19, 01:20 UTC1h 25m
2026-07-18 FFT1062 MCO → CVG Jul 18, 21:30 UTCJul 18, 22:25 UTC55m
2026-07-18 FFT3303 PHX → LAX Jul 18, 18:50 UTCJul 18, 19:50 UTC1h 0m
2026-07-18 FFT1085 - Jul 18, 13:30 UTCJul 18, 17:20 UTC3h 50m
2026-07-18 FFT4146 LAX → MCO Jul 18, 06:45 UTCJul 18, 11:15 UTC4h 30m
2026-07-18 FFT2858 SFO → LAX Jul 18, 04:25 UTCJul 18, 05:25 UTC1h 0m
2026-07-17 FFT1447 ATL → SFO Jul 17, 22:10 UTCJul 18, 02:29 UTC4h 20m
2026-07-17 FFT3600 - Jul 17, 16:55 UTCJul 17, 19:45 UTC2h 50m
2026-07-17 FFT2350 LAS → DEN Jul 17, 13:13 UTCJul 17, 14:40 UTC1h 27m
2026-07-17 FFT2350 - Jul 17, 13:15 UTCJul 17, 14:15 UTC1h 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 N638FR page for operator, model, and routing details .

Mode-S A85C01 frequently asked

What is Mode-S code A85C01?
A85C01 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N638FR.
Where is Mode-S A85C01 registered?
Mode-S code A85C01 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 A85C01 broadcasting right now?
Yes. Mode-S A85C01 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A85C01, octal 52056001, decimal 11,033,601.
What flights does A85C01 operate?
Mode-S A85C01 has broadcast 20 distinct callsigns, including FFT2082, FFT1015, FFT2871, FFT2791, FFT2529.