Apparatus

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sensors Mode-S transponder

AAAA9A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N787AU · PIPER PA-44 Seminole · operated by AUBURN UNIVERSITY

Hex
AAAA9A
Octal
52525232
Decimal
11,184,794
Country
US
Tail
N787AU
Type
PA44
No current signal · last broadcast 2d ago
Flights observed
115
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S AAAA9A.

Country allocation

The ICAO 24-bit address AAAA9A 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 1 distinct

Callsign Airline Flights Last seen
AUB1787 - 115 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 AUB1787 AUO → AUO Jul 17, 21:30 UTCJul 17, 22:29 UTC1h 0m
2026-07-17 AUB1787 AUO → AUO Jul 17, 14:50 UTCJul 17, 15:35 UTC45m
2026-07-16 AUB1787 AUO → AUO Jul 16, 23:59 UTCJul 17, 01:20 UTC1h 20m
2026-07-16 AUB1787 AUO → AUO Jul 16, 21:50 UTCJul 16, 22:59 UTC1h 10m
2026-07-15 AUB1787 AUO → AUO Jul 15, 23:50 UTCJul 16, 00:55 UTC1h 5m
2026-07-15 AUB1787 AUO → AUO Jul 15, 21:35 UTCJul 15, 22:35 UTC1h 0m
2026-07-13 AUB1787 AUO → AUO Jul 13, 17:45 UTCJul 13, 19:25 UTC1h 40m
2026-07-11 AUB1787 - Jul 11, 16:00 UTCJul 11, 16:20 UTC20m
2026-07-11 AUB1787 - Jul 11, 14:40 UTCJul 11, 15:00 UTC20m
2026-07-09 AUB1787 - Jul 9, 15:15 UTCJul 9, 16:40 UTC1h 25m
2026-07-09 AUB1787 AUO → AUO Jul 9, 13:10 UTCJul 9, 14:25 UTC1h 15m
2026-07-09 AUB1787 - Jul 9, 00:30 UTCJul 9, 00:45 UTC15m
2026-07-09 AUB1787 - Jul 9, 00:15 UTCJul 9, 00:25 UTC10m
2026-07-08 AUB1787 AUO → AUO Jul 8, 23:50 UTCJul 8, 23:55 UTC5m
2026-07-08 AUB1787 AUO → AUO Jul 8, 21:25 UTCJul 8, 22:25 UTC1h 0m
2026-07-08 AUB1787 AUO → AUO Jul 8, 17:50 UTCJul 8, 18:50 UTC1h 0m
2026-07-08 AUB1787 AUO → AUO Jul 8, 14:45 UTCJul 8, 16:10 UTC1h 25m
2026-07-07 AUB1787 AUO → AUO Jul 7, 23:15 UTCJul 8, 00:20 UTC1h 5m
2026-07-07 AUB1787 - Jul 7, 20:30 UTCJul 7, 20:55 UTC25m
2026-07-07 AUB1787 - Jul 7, 19:35 UTCJul 7, 19:50 UTC15m
2026-07-07 AUB1787 AUO → AUO Jul 7, 17:30 UTCJul 7, 18:50 UTC1h 20m
2026-07-07 AUB1787 AUO → AUO Jul 7, 15:15 UTCJul 7, 16:20 UTC1h 5m
2026-07-07 AUB1787 AUO → AUO Jul 7, 13:15 UTCJul 7, 14:05 UTC50m
2026-07-07 AUB1787 AUO → AUO Jul 7, 11:50 UTCJul 7, 11:55 UTC5m
2026-07-06 AUB1787 - Jul 6, 15:55 UTCJul 6, 16:00 UTC5m
2026-07-06 AUB1787 - Jul 6, 14:50 UTCJul 6, 15:45 UTC55m
2026-07-02 AUB1787 AUO → AUO Jul 2, 20:40 UTCJul 2, 21:45 UTC1h 5m
2026-06-05 AUB1787 - Jun 5, 19:15 UTCJun 5, 19:35 UTC20m
2026-06-04 AUB1787 - Jun 4, 14:45 UTCJun 4, 15:45 UTC1h 0m
2026-06-03 AUB1787 AUO → AUO Jun 3, 23:20 UTCJun 4, 00:25 UTC1h 5m
2026-06-03 AUB1787 AUO → AUO Jun 3, 21:20 UTCJun 3, 22:00 UTC40m
2026-06-03 AUB1787 AUO → AUO Jun 3, 19:10 UTCJun 3, 20:10 UTC1h 0m
2026-06-03 AUB1787 AUO → AUO Jun 3, 15:30 UTCJun 3, 16:45 UTC1h 15m
2026-06-03 AUB1787 AUO → AUO Jun 3, 11:50 UTCJun 3, 12:50 UTC1h 0m
2026-06-02 AUB1787 AUO → AUO Jun 2, 20:40 UTCJun 2, 21:50 UTC1h 10m
2026-06-02 AUB1787 - Jun 2, 18:45 UTCJun 2, 18:55 UTC10m
2026-06-02 AUB1787 - Jun 2, 17:40 UTCJun 2, 17:55 UTC15m
2026-06-02 AUB1787 AUO → AUO Jun 2, 13:30 UTCJun 2, 14:35 UTC1h 5m
2026-06-01 AUB1787 AUO → AUO Jun 1, 19:45 UTCJun 1, 20:45 UTC1h 0m
2026-05-28 AUB1787 AUO → AUO May 28, 21:20 UTCMay 28, 21:45 UTC25m
2026-05-28 AUB1787 AUO → AUO May 28, 14:30 UTCMay 28, 15:05 UTC35m
2026-05-28 AUB1787 AUO → AUO May 28, 02:00 UTCMay 28, 04:20 UTC2h 20m
2026-05-22 AUB1787 SAV → AUO May 22, 16:30 UTCMay 22, 18:35 UTC2h 5m
2026-05-22 AUB1787 AUO → SAV May 22, 12:10 UTCMay 22, 15:10 UTC3h 0m
2026-05-21 AUB1787 AUO → AUO May 21, 23:25 UTCMay 22, 00:50 UTC1h 25m
2026-05-21 AUB1787 AUO → AUO May 21, 21:35 UTCMay 21, 22:20 UTC45m
2026-05-21 AUB1787 - May 21, 00:10 UTCMay 21, 00:50 UTC40m
2026-05-20 AUB1787 - May 20, 23:55 UTCMay 21, 00:00 UTC5m
2026-05-20 AUB1787 AUO → AUO May 20, 23:40 UTCMay 20, 23:45 UTC5m
2026-05-19 AUB1787 - May 19, 22:35 UTCMay 19, 22:50 UTC15m

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 N787AU page for operator, model, and routing details .

Mode-S AAAA9A frequently asked

What is Mode-S code AAAA9A?
AAAA9A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N787AU.
Where is Mode-S AAAA9A registered?
Mode-S code AAAA9A 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 AAAA9A broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAAA9A, octal 52525232, decimal 11,184,794.
What flights does AAAA9A operate?
Mode-S AAAA9A has broadcast 1 distinct callsign, including AUB1787.