Apparatus

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sensors Mode-S transponder

AAEF21

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N803XT · BOEING 737-800 · operated by UMB BANK NA TRUSTEE

Hex
AAEF21
Octal
52567441
Decimal
11,202,337
Country
US
Tail
N803XT
Type
B738
No current signal · last broadcast Jul 26, 21:00 UTC
Flights observed
337
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:00 UTC

Last known position

Most recent position reported by Mode-S AAEF21.

Country allocation

The ICAO 24-bit address AAEF21 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
VXP543 Mali Air Express 23 2026-07-26
VXP542 Mali Air Express 23 2026-07-26
VXP557 - 18 2026-07-23
VXP556 Mali Air Express 18 2026-07-23
VXP559 Mali Air Express 17 2026-07-24
VXP558 - 15 2026-07-24
VXP583 Mali Air Express 13 2026-07-26
VXP561 - 13 2026-07-13
VXP560 - 13 2026-07-13
VXP541 Mali Air Express 13 2026-06-15
VXP540 Mali Air Express 13 2026-06-15
VXP582 Mali Air Express 12 2026-07-25
VXP585 Mali Air Express 9 2026-07-25
VXP584 Mali Air Express 9 2026-07-24
VXP525 Mali Air Express 9 2026-07-23
VXP524 Mali Air Express 9 2026-07-23
VXP515 Mali Air Express 8 2026-07-26
VXP516 Mali Air Express 7 2026-07-26
VXP565 Mali Air Express 5 2026-07-19
VXP564 Mali Air Express 5 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 VXP516 MYR → ILG Jul 26, 19:45 UTCJul 26, 21:00 UTC1h 15m
2026-07-26 VXP515 ILG → MYR Jul 26, 17:35 UTCJul 26, 18:35 UTC1h 0m
2026-07-26 VXP543 FLL → ILG Jul 26, 14:05 UTCJul 26, 16:20 UTC2h 15m
2026-07-26 VXP542 FLL → ILG Jul 26, 10:40 UTCJul 26, 12:55 UTC2h 15m
2026-07-26 VXP583 SJU → ILG Jul 26, 01:35 UTCJul 26, 02:35 UTC1h 0m
2026-07-25 VXP583 SJU → ILG Jul 25, 23:05 UTCJul 25, 23:20 UTC15m
2026-07-25 VXP582 SAV → ILG Jul 25, 21:00 UTCJul 25, 21:25 UTC25m
2026-07-25 VXP582 SAV → ILG Jul 25, 17:40 UTCJul 25, 19:30 UTC1h 50m
2026-07-25 VXP562 MCO → ILG Jul 25, 14:25 UTCJul 25, 16:15 UTC1h 50m
2026-07-25 VXP563 ILG → RSW Jul 25, 11:05 UTCJul 25, 13:00 UTC1h 55m
2026-07-25 VXP585 SJU → ILG Jul 25, 02:05 UTCJul 25, 03:15 UTC1h 10m
2026-07-24 VXP585 SJU → ILG Jul 24, 23:45 UTCJul 24, 23:55 UTC10m
2026-07-24 VXP584 ILG → SJU Jul 24, 22:05 UTCJul 24, 22:25 UTC20m
2026-07-24 VXP584 ILG → SJU Jul 24, 18:55 UTCJul 24, 20:00 UTC1h 5m
2026-07-24 VXP558 RSW → ILG Jul 24, 14:35 UTCJul 24, 16:55 UTC2h 20m
2026-07-24 VXP559 ILG → MCO Jul 24, 10:55 UTCJul 24, 13:10 UTC2h 15m
2026-07-23 VXP525 ILG → GSP Jul 23, 22:45 UTCJul 24, 00:50 UTC2h 5m
2026-07-23 VXP524 ILG → LAL Jul 23, 19:35 UTCJul 23, 21:45 UTC2h 10m
2026-07-23 VXP557 RSW → ILG Jul 23, 15:15 UTCJul 23, 17:25 UTC2h 10m
2026-07-23 VXP556 ILG → RSW Jul 23, 11:40 UTCJul 23, 13:55 UTC2h 15m
2026-07-23 VXP583 SJU → ILG Jul 23, 01:30 UTCJul 23, 02:20 UTC50m
2026-07-22 VXP583 SJU → ILG Jul 22, 22:55 UTCJul 22, 23:10 UTC15m
2026-07-22 VXP582 SAV → ILG Jul 22, 20:45 UTCJul 22, 21:10 UTC25m
2026-07-22 VXP582 SAV → ILG Jul 22, 17:40 UTCJul 22, 18:25 UTC45m
2026-07-21 VXP585 SJU → ILG Jul 21, 01:40 UTCJul 21, 03:25 UTC1h 45m
2026-07-20 VXP585 SJU → ILG Jul 20, 23:40 UTCJul 20, 23:50 UTC10m
2026-07-20 VXP584 ILG → SJU Jul 20, 21:55 UTCJul 20, 22:15 UTC20m
2026-07-20 VXP584 ILG → SJU Jul 20, 18:35 UTCJul 20, 19:55 UTC1h 20m
2026-07-20 VXP558 RSW → ILG Jul 20, 14:35 UTCJul 20, 16:40 UTC2h 5m
2026-07-20 VXP559 ILG → MCO Jul 20, 10:50 UTCJul 20, 13:00 UTC2h 10m
2026-07-20 VXP564 RSW → ILG Jul 20, 01:50 UTCJul 20, 03:45 UTC1h 55m
2026-07-19 VXP565 ILG → MCO Jul 19, 22:40 UTCJul 20, 00:40 UTC2h 0m
2026-07-19 VXP516 MYR → ILG Jul 19, 20:10 UTCJul 19, 21:10 UTC1h 0m
2026-07-19 VXP515 ILG → MYR Jul 19, 17:40 UTCJul 19, 18:40 UTC1h 0m
2026-07-19 VXP543 FLL → ILG Jul 19, 14:20 UTCJul 19, 16:25 UTC2h 5m
2026-07-19 VXP542 FLL → ILG Jul 19, 10:40 UTCJul 19, 12:50 UTC2h 10m
2026-07-19 VXP583 - Jul 19, 01:20 UTCJul 19, 02:35 UTC1h 15m
2026-07-18 VXP583 - Jul 18, 22:55 UTCJul 18, 23:05 UTC10m
2026-07-18 VXP582 SAV → ILG Jul 18, 18:00 UTCJul 18, 21:35 UTC3h 35m
2026-07-18 VXP562 - Jul 18, 14:45 UTCJul 18, 16:50 UTC2h 5m
2026-07-18 VXP563 - Jul 18, 11:15 UTCJul 18, 13:15 UTC2h 0m
2026-07-18 VXP585 SJU → ILG Jul 18, 02:00 UTCJul 18, 03:15 UTC1h 16m
2026-07-17 VXP585 SJU → ILG Jul 17, 23:39 UTCJul 17, 23:50 UTC10m
2026-07-17 VXP584 ILG → SJU Jul 17, 18:19 UTCJul 17, 21:44 UTC3h 25m
2026-07-17 VXP558 - Jul 17, 14:20 UTCJul 17, 16:34 UTC2h 15m
2026-07-17 VXP559 ILG → MCO Jul 17, 10:44 UTCJul 17, 12:55 UTC2h 10m
2026-07-17 VXP564 - Jul 17, 01:59 UTCJul 17, 03:55 UTC1h 55m
2026-07-16 VXP565 - Jul 16, 22:40 UTCJul 17, 00:35 UTC1h 55m
2026-07-16 VXP516 - Jul 16, 20:09 UTCJul 16, 21:19 UTC1h 10m
2026-07-16 VXP515 - Jul 16, 17:49 UTCJul 16, 18:55 UTC1h 5m

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 N803XT page for operator, model, and routing details .

Mode-S AAEF21 frequently asked

What is Mode-S code AAEF21?
AAEF21 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N803XT.
Where is Mode-S AAEF21 registered?
Mode-S code AAEF21 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 AAEF21 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAEF21, octal 52567441, decimal 11,202,337.
What flights does AAEF21 operate?
Mode-S AAEF21 has broadcast 20 distinct callsigns, including VXP543, VXP542, VXP557, VXP556, VXP559.