Apparatus

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sensors Mode-S transponder

A81E38

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N622FR · AIRBUS A-321neo · operated by BANK OF UTAH TRUSTEE

Hex
A81E38
Octal
52017070
Decimal
11,017,784
Country
US
Tail
N622FR
Type
A21N
No current signal · last broadcast 11h ago
Flights observed
482
Distinct callsigns
20
Country
US
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S A81E38.

Country allocation

The ICAO 24-bit address A81E38 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
FFT1407 - 6 2026-07-09
FFT3288 Frontier Airlines 5 2026-05-17
FFT4874 Frontier Airlines 4 2026-05-17
FFT4758 Frontier Airlines 4 2026-06-18
FFT4411 Frontier Airlines 4 2026-06-01
FFT4036 Frontier Airlines 4 2026-05-31
FFT3663 - 4 2026-07-11
FFT3599 Frontier Airlines 4 2026-06-05
FFT3287 Frontier Airlines 4 2026-05-17
FFT2885 - 4 2026-06-29
FFT2529 - 4 2026-07-11
FFT2232 Frontier Airlines 4 2026-05-04
FFT1550 Frontier Airlines 4 2026-05-29
FFT1516 - 4 2026-07-11
FFT87 Frontier Airlines 3 2026-07-03
FFT777 - 3 2026-06-18
FFT70 Frontier Airlines 3 2026-06-16
FFT4712 Frontier Airlines 3 2026-05-30
FFT4707 Frontier Airlines 3 2026-05-31
FFT45 Frontier Airlines 3 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 FFT3819 - Jul 13, 23:25 UTCJul 14, 01:25 UTC2h 0m
2026-07-13 FFT1620 - Jul 13, 19:45 UTCJul 13, 21:50 UTC2h 5m
2026-07-13 FFT1445 - Jul 13, 16:50 UTCJul 13, 18:00 UTC1h 10m
2026-07-13 FFT1446 - Jul 13, 13:45 UTCJul 13, 15:00 UTC1h 15m
2026-07-13 FFT2668 CLE → MCO Jul 13, 10:15 UTCJul 13, 12:15 UTC2h 0m
2026-07-13 FFT3568 DFW → CLE Jul 13, 04:40 UTCJul 13, 06:45 UTC2h 5m
2026-07-13 FFT3567 OKC → DFW Jul 13, 02:05 UTCJul 13, 02:45 UTC40m
2026-07-13 FFT3567 OKC → DFW Jul 13, 02:04 UTCJul 13, 02:42 UTC38m
2026-07-12 FFT3567 - Jul 12, 21:40 UTCJul 13, 00:40 UTC3h 0m
2026-07-12 FFT206 CUN → CLE Jul 12, 15:25 UTCJul 12, 18:45 UTC3h 20m
2026-07-12 FFT207 CLE → CUN Jul 12, 10:35 UTCJul 12, 13:40 UTC3h 5m
2026-07-12 FFT2279 MCO → CLE Jul 12, 00:45 UTCJul 12, 02:40 UTC1h 55m
2026-07-11 FFT3663 - Jul 11, 19:30 UTCJul 11, 21:15 UTC1h 45m
2026-07-11 FFT1516 DTW → BWI Jul 11, 16:55 UTCJul 11, 18:00 UTC1h 5m
2026-07-11 FFT1516 DTW → BWI Jul 11, 17:01 UTCJul 11, 17:59 UTC58m
2026-07-11 FFT2529 - Jul 11, 13:25 UTCJul 11, 15:30 UTC2h 5m
2026-07-11 FFT2529 MCO → DTW Jul 11, 13:20 UTCJul 11, 15:30 UTC2h 10m
2026-07-11 FFT4146 - Jul 11, 06:30 UTCJul 11, 11:05 UTC4h 35m
2026-07-11 FFT2858 - Jul 11, 03:45 UTCJul 11, 04:45 UTC1h 0m
2026-07-10 FFT1447 - Jul 10, 21:45 UTCJul 11, 02:05 UTC4h 20m
2026-07-10 FFT4731 - Jul 10, 17:20 UTCJul 10, 19:05 UTC1h 45m
2026-07-10 FFT4732 - Jul 10, 13:50 UTCJul 10, 15:35 UTC1h 45m
2026-07-10 FFT4732 - Jul 10, 10:25 UTCJul 10, 11:20 UTC55m
2026-07-10 FFT1670 ATL → RDU Jul 10, 03:25 UTCJul 10, 04:25 UTC1h 0m
2026-07-09 FFT4702 - Jul 9, 23:45 UTCJul 10, 01:25 UTC1h 40m
2026-07-09 FFT4211 ATL → AUS Jul 9, 20:35 UTCJul 9, 22:25 UTC1h 50m
2026-07-09 FFT1407 BUF → ATL Jul 9, 15:45 UTCJul 9, 17:30 UTC1h 45m
2026-07-09 FFT1407 BUF → ATL Jul 9, 15:42 UTCJul 9, 17:25 UTC1h 43m
2026-07-09 FFT1408 ATL → BUF Jul 9, 12:30 UTCJul 9, 14:00 UTC1h 30m
2026-07-09 FFT2428 LAS → ATL Jul 9, 07:03 UTCJul 9, 10:58 UTC3h 55m
2026-07-09 FFT2428 LAS → ATL Jul 9, 07:20 UTCJul 9, 10:50 UTC3h 30m
2026-07-09 FFT2408 SEA → LAS Jul 9, 03:30 UTCJul 9, 05:30 UTC2h 0m
2026-07-09 FFT2408 SEA → LAS Jul 9, 03:26 UTCJul 9, 05:27 UTC2h 1m
2026-07-08 FFT2275 ONT → SEA Jul 8, 23:10 UTCJul 9, 01:20 UTC2h 10m
2026-07-08 FFT1357 LAS → ONT Jul 8, 21:05 UTCJul 8, 21:45 UTC40m
2026-07-08 FFT1357 LAS → ONT Jul 8, 21:18 UTCJul 8, 21:41 UTC23m
2026-07-08 FFT4891 ATL → LAS Jul 8, 15:40 UTCJul 8, 19:10 UTC3h 30m
2026-07-08 FFT1241 MCO → ATL Jul 8, 11:50 UTCJul 8, 12:55 UTC1h 5m
2026-07-08 FFT1242 ATL → MCO Jul 8, 09:35 UTCJul 8, 10:30 UTC55m
2026-07-08 FFT2871 - Jul 8, 00:20 UTCJul 8, 01:55 UTC1h 35m
2026-07-07 FFT2871 - Jul 7, 22:35 UTCJul 7, 22:50 UTC15m
2026-07-07 FFT1774 - Jul 7, 17:25 UTCJul 7, 20:50 UTC3h 25m
2026-07-07 FFT1774 BWI → SJU Jul 7, 16:48 UTCJul 7, 20:51 UTC4h 3m
2026-07-06 FFT2265 - Jul 6, 11:45 UTCJul 6, 15:05 UTC3h 20m
2026-07-06 FFT240 - Jul 6, 01:50 UTCJul 6, 02:05 UTC15m
2026-07-05 FFT241 - Jul 5, 23:15 UTCJul 5, 23:30 UTC15m
2026-07-05 FFT241 SJU → PUJ Jul 5, 23:27 UTCJul 5, 23:46 UTC19m
2026-07-05 FFT38 - Jul 5, 20:35 UTCJul 5, 20:45 UTC10m
2026-07-05 FFT32 - Jul 5, 14:30 UTCJul 5, 15:40 UTC1h 10m
2026-07-05 FFT1838 ATL → CLE Jul 5, 11:15 UTCJul 5, 12:30 UTC1h 15m

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 N622FR page for operator, model, and routing details .

Mode-S A81E38 frequently asked

What is Mode-S code A81E38?
A81E38 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N622FR.
Where is Mode-S A81E38 registered?
Mode-S code A81E38 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 A81E38 broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A81E38, octal 52017070, decimal 11,017,784.
What flights does A81E38 operate?
Mode-S A81E38 has broadcast 20 distinct callsigns, including FFT1407, FFT3288, FFT4874, FFT4758, FFT4411.