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
Transponder active on ground
Flights observed
463
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A85C01.

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
FFT2871 Frontier Airlines 6 2026-05-16
FFT1016 Frontier Airlines 6 2026-05-16
FFT87 Frontier Airlines 5 2026-07-02
FFT7 - 5 2026-05-18
FFT44 - 5 2026-07-02
FFT3692 Frontier Airlines 5 2026-05-29
FFT3136 Frontier Airlines 5 2026-07-02
FFT2836 - 5 2026-07-13
FFT2675 Frontier Airlines 5 2026-06-08
FFT2636 - 5 2026-07-02
FFT2529 Frontier Airlines 5 2026-07-05
FFT2136 Frontier Airlines 5 2026-06-08
FFT1165 Frontier Airlines 5 2026-05-17
FFT1015 - 5 2026-07-10
FFT4671 - 4 2026-07-08
FFT4113 - 4 2026-07-08
FFT3663 - 4 2026-07-05
FFT3086 Frontier Airlines 4 2026-05-17
FFT3085 Frontier Airlines 4 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 FFT2582 - Jul 14, 01:35 UTCJul 14, 03:45 UTC2h 10m
2026-07-13 FFT2499 - Jul 13, 21:35 UTCJul 13, 23:45 UTC2h 10m
2026-07-13 FFT2499 - Jul 13, 21:31 UTCJul 13, 23:43 UTC2h 12m
2026-07-13 FFT2060 RDU → PHL Jul 13, 18:55 UTCJul 13, 19:55 UTC1h 0m
2026-07-13 FFT2060 RDU → PHL Jul 13, 18:53 UTCJul 13, 19:53 UTC1h 0m
2026-07-13 FFT2730 TPA → RDU Jul 13, 16:15 UTCJul 13, 17:35 UTC1h 20m
2026-07-13 FFT4807 PHL → TPA Jul 13, 12:05 UTCJul 13, 14:15 UTC2h 10m
2026-07-13 FFT2836 - Jul 13, 05:20 UTCJul 13, 05:31 UTC10m
2026-07-13 FFT2836 - Jul 13, 03:15 UTCJul 13, 05:15 UTC2h 0m
2026-07-12 FFT2269 PHL → TPA Jul 12, 23:15 UTCJul 13, 01:30 UTC2h 15m
2026-07-12 FFT181 PHL → PHL Jul 12, 11:30 UTCJul 12, 19:45 UTC8h 15m
2026-07-12 FFT2836 - Jul 12, 05:40 UTCJul 12, 07:35 UTC1h 55m
2026-07-12 FFT2269 PHL → TPA Jul 12, 02:05 UTCJul 12, 04:15 UTC2h 10m
2026-07-11 FFT23 - Jul 11, 12:10 UTCJul 11, 20:40 UTC8h 30m
2026-07-11 FFT2836 TPA → PHL Jul 11, 04:50 UTCJul 11, 06:45 UTC1h 55m
2026-07-11 FFT2836 TPA → PHL Jul 11, 04:30 UTCJul 11, 06:45 UTC2h 15m
2026-07-10 FFT2215 - Jul 10, 23:40 UTCJul 11, 00:30 UTC50m
2026-07-10 FFT2215 - Jul 10, 21:45 UTCJul 10, 21:55 UTC10m
2026-07-10 FFT1166 MCO → PHL Jul 10, 19:00 UTCJul 10, 19:20 UTC20m
2026-07-10 FFT1166 MCO → PHL Jul 10, 16:05 UTCJul 10, 16:50 UTC45m
2026-07-10 FFT1015 - Jul 10, 13:40 UTCJul 10, 14:20 UTC40m
2026-07-10 FFT1015 - Jul 10, 11:00 UTCJul 10, 11:10 UTC10m
2026-07-10 FFT1226 - Jul 10, 04:10 UTCJul 10, 04:30 UTC20m
2026-07-10 FFT1226 - Jul 10, 01:30 UTCJul 10, 02:30 UTC1h 0m
2026-07-10 FFT1226 RDU → SJU Jul 10, 01:35 UTCJul 10, 04:36 UTC3h 1m
2026-07-09 FFT1225 - Jul 9, 23:50 UTCJul 10, 00:15 UTC25m
2026-07-09 FFT1225 - Jul 9, 21:25 UTCJul 9, 21:35 UTC10m
2026-07-09 FFT3018 - Jul 9, 19:55 UTCJul 9, 20:05 UTC10m
2026-07-09 FFT3018 - Jul 9, 17:45 UTCJul 9, 18:10 UTC25m
2026-07-09 FFT2205 - Jul 9, 13:25 UTCJul 9, 16:00 UTC2h 35m
2026-07-09 FFT2446 - Jul 9, 07:25 UTCJul 9, 11:00 UTC3h 35m
2026-07-09 FFT1183 - Jul 9, 04:35 UTCJul 9, 05:15 UTC40m
2026-07-09 FFT1183 LAS → LAX Jul 9, 04:13 UTCJul 9, 05:14 UTC1h 1m
2026-07-08 FFT1466 SAN → LAS Jul 8, 23:00 UTCJul 8, 23:50 UTC50m
2026-07-08 FFT1466 SAN → LAS Jul 8, 22:41 UTCJul 8, 23:50 UTC1h 9m
2026-07-08 FFT1325 LAS → SAN Jul 8, 20:35 UTCJul 8, 21:20 UTC45m
2026-07-08 FFT4277 IAD → LAS Jul 8, 14:50 UTCJul 8, 18:55 UTC4h 5m
2026-07-08 FFT4278 - Jul 8, 08:55 UTCJul 8, 13:10 UTC4h 15m
2026-07-08 FFT4113 PHX → LAS Jul 8, 06:20 UTCJul 8, 07:00 UTC40m
2026-07-08 FFT4671 - Jul 8, 01:35 UTCJul 8, 04:55 UTC3h 20m
2026-07-08 FFT4671 DTW → PHX Jul 8, 01:12 UTCJul 8, 04:55 UTC3h 43m
2026-07-07 FFT1958 - Jul 7, 21:25 UTCJul 8, 00:00 UTC2h 35m
2026-07-07 FFT4184 - Jul 7, 17:20 UTCJul 7, 19:35 UTC2h 15m
2026-07-07 FFT4184 PHX → IAH Jul 7, 17:18 UTCJul 7, 19:35 UTC2h 17m
2026-07-07 FFT4949 SLC → PHX Jul 7, 03:25 UTCJul 7, 04:40 UTC1h 15m
2026-07-07 FFT3394 SFO → SLC Jul 7, 00:30 UTCJul 7, 01:55 UTC1h 25m
2026-07-06 FFT1191 PHX → SFO Jul 6, 21:05 UTCJul 6, 22:45 UTC1h 40m
2026-07-06 FFT1703 - Jul 6, 17:20 UTCJul 6, 19:35 UTC2h 15m
2026-07-06 FFT1703 IAH → PHX Jul 6, 17:04 UTCJul 6, 19:31 UTC2h 27m
2026-07-06 FFT1957 - Jul 6, 13:15 UTCJul 6, 15:40 UTC2h 25m

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?
Mode-S A85C01 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 A85C01, octal 52056001, decimal 11,033,601.
What flights does A85C01 operate?
Mode-S A85C01 has broadcast 20 distinct callsigns, including FFT2082, FFT2871, FFT1016, FFT87, FFT7.