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sensors Mode-S transponder

AA9000

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N78US · DIAMOND DA-40 Club Star · operated by UTAH STATE UNIVERSITY

Hex
AA9000
Octal
52510000
Decimal
11,177,984
Country
US
Tail
N78US
Type
DA40
No current signal · last broadcast Jul 26, 17:05 UTC
Flights observed
202
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 17:05 UTC

Last known position

Most recent position reported by Mode-S AA9000.

Country allocation

The ICAO 24-bit address AA9000 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
N78US - 202 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N78US LGU → LGU Jul 26, 15:40 UTCJul 26, 17:00 UTC1h 20m
2026-07-25 N78US LGU → LGU Jul 25, 18:00 UTCJul 25, 19:15 UTC1h 15m
2026-07-25 N78US - Jul 25, 16:35 UTCJul 25, 16:50 UTC15m
2026-07-24 N78US LGU → LGU Jul 24, 18:05 UTCJul 24, 19:30 UTC1h 25m
2026-07-24 N78US - Jul 24, 16:05 UTCJul 24, 16:25 UTC20m
2026-07-24 N78US - Jul 24, 15:10 UTCJul 24, 15:30 UTC20m
2026-07-24 N78US - Jul 24, 01:20 UTCJul 24, 01:55 UTC35m
2026-07-23 N78US - Jul 23, 22:30 UTCJul 23, 22:35 UTC5m
2026-07-23 N78US LGU → LGU Jul 23, 15:55 UTCJul 23, 16:00 UTC5m
2026-07-23 N78US LGU → LGU Jul 23, 12:55 UTCJul 23, 14:50 UTC1h 55m
2026-07-22 N78US LGU → LGU Jul 22, 15:25 UTCJul 22, 16:05 UTC40m
2026-07-17 N78US LGU → LGU Jul 17, 14:04 UTCJul 17, 15:55 UTC1h 50m
2026-07-16 N78US LGU → LGU Jul 16, 17:10 UTCJul 16, 18:19 UTC1h 10m
2026-07-16 N78US - Jul 16, 16:09 UTCJul 16, 16:19 UTC10m
2026-07-16 N78US - Jul 16, 15:14 UTCJul 16, 15:19 UTC5m
2026-07-15 N78US LGU → LGU Jul 15, 16:35 UTCJul 15, 17:45 UTC1h 10m
2026-07-14 N78US - Jul 14, 18:00 UTCJul 14, 18:40 UTC40m
2026-07-14 N78US - Jul 14, 15:15 UTCJul 14, 15:50 UTC35m
2026-07-14 N78US LGU → LGU Jul 14, 13:20 UTCJul 14, 14:30 UTC1h 10m
2026-07-14 N78US LGU → LGU Jul 14, 03:50 UTCJul 14, 04:25 UTC35m
2026-07-14 N78US LGU → LGU Jul 14, 01:10 UTCJul 14, 02:20 UTC1h 10m
2026-07-13 N78US LGU → LGU Jul 13, 22:00 UTCJul 13, 23:00 UTC1h 0m
2026-07-13 N78US - Jul 13, 18:00 UTCJul 13, 18:35 UTC35m
2026-07-13 N78US - Jul 13, 16:00 UTCJul 13, 16:35 UTC35m
2026-07-11 N78US - Jul 11, 16:10 UTCJul 11, 16:25 UTC15m
2026-07-11 N78US - Jul 11, 14:35 UTCJul 11, 15:00 UTC25m
2026-07-10 N78US LGU → LGU Jul 10, 18:20 UTCJul 10, 19:20 UTC1h 0m
2026-07-10 N78US LGU → LGU Jul 10, 17:45 UTCJul 10, 18:15 UTC30m
2026-07-10 N78US LGU → LGU Jul 10, 16:30 UTCJul 10, 16:45 UTC15m
2026-07-10 N78US LGU → LGU Jul 10, 15:25 UTCJul 10, 16:25 UTC1h 0m
2026-07-10 N78US - Jul 10, 03:50 UTCJul 10, 04:55 UTC1h 5m
2026-07-10 N78US LGU → LGU Jul 10, 03:25 UTCJul 10, 03:35 UTC10m
2026-07-09 N78US LGU → LGU Jul 9, 22:30 UTCJul 9, 23:40 UTC1h 10m
2026-07-09 N78US - Jul 9, 16:40 UTCJul 9, 18:35 UTC1h 55m
2026-07-09 N78US LGU → LGU Jul 9, 14:10 UTCJul 9, 15:50 UTC1h 40m
2026-07-09 N78US - Jul 9, 05:10 UTCJul 9, 05:30 UTC20m
2026-07-09 N78US LGU → LGU Jul 9, 04:55 UTCJul 9, 05:05 UTC10m
2026-07-08 N78US LGU → LGU Jul 8, 15:25 UTCJul 8, 16:20 UTC55m
2026-07-07 N78US - Jul 7, 16:00 UTCJul 7, 16:20 UTC20m
2026-07-07 N78US - Jul 7, 15:00 UTCJul 7, 15:20 UTC20m
2026-07-07 N78US LGU → LGU Jul 7, 13:35 UTCJul 7, 14:15 UTC40m
2026-07-06 N78US LGU → LGU Jul 6, 20:25 UTCJul 6, 21:35 UTC1h 10m
2026-07-06 N78US LGU → LGU Jul 6, 15:15 UTCJul 6, 16:30 UTC1h 15m
2026-07-03 N78US LGU → LGU Jul 3, 15:15 UTCJul 3, 17:00 UTC1h 45m
2026-07-03 N78US LGU → LGU Jul 3, 03:50 UTCJul 3, 06:05 UTC2h 15m
2026-07-02 N78US LGU → LGU Jul 2, 15:45 UTCJul 2, 17:25 UTC1h 40m
2026-07-01 N78US LGU → LGU Jul 1, 18:30 UTCJul 1, 19:40 UTC1h 10m
2026-07-01 N78US - Jul 1, 17:10 UTCJul 1, 17:30 UTC20m
2026-07-01 N78US - Jul 1, 15:55 UTCJul 1, 16:25 UTC30m
2026-07-01 N78US - Jul 1, 00:55 UTCJul 1, 01:40 UTC45m

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 N78US page for operator, model, and routing details .

Mode-S AA9000 frequently asked

What is Mode-S code AA9000?
AA9000 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N78US.
Where is Mode-S AA9000 registered?
Mode-S code AA9000 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 AA9000 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA9000, octal 52510000, decimal 11,177,984.
What flights does AA9000 operate?
Mode-S AA9000 has broadcast 1 distinct callsign, including N78US.