Apparatus

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sensors Mode-S transponder

AA9E1F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N78303 · CESSNA 172 Skyhawk · operated by CITIZEN AIR LLC

Hex
AA9E1F
Octal
52517037
Decimal
11,181,599
Country
US
Tail
N78303
Type
C172
No current signal · last broadcast 15h ago
Flights observed
181
Distinct callsigns
1
Country
US
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S AA9E1F.

Country allocation

The ICAO 24-bit address AA9E1F 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
N78303 - 181 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 N78303 - May 29, 20:35 UTCMay 29, 21:20 UTC45m
2026-05-29 N78303 - May 29, 04:25 UTCMay 29, 06:15 UTC1h 50m
2026-05-28 N78303 CLM → CLM May 28, 22:00 UTCMay 28, 23:10 UTC1h 10m
2026-05-28 N78303 - May 28, 17:55 UTCMay 28, 19:10 UTC1h 15m
2026-05-28 N78303 - May 28, 15:40 UTCMay 28, 17:05 UTC1h 25m
2026-05-27 N78303 CLM → CLM May 27, 18:55 UTCMay 27, 20:40 UTC1h 45m
2026-05-26 N78303 CLM → CLM May 26, 19:34 UTCMay 26, 21:00 UTC1h 25m
2026-05-26 N78303 - May 26, 16:05 UTCMay 26, 18:59 UTC2h 55m
2026-05-26 N78303 - May 26, 02:04 UTCMay 26, 03:00 UTC55m
2026-05-25 N78303 CLM → CLM May 25, 23:14 UTCMay 26, 00:29 UTC1h 15m
2026-05-25 N78303 CLM → CLM May 25, 20:34 UTCMay 25, 20:55 UTC20m
2026-05-25 N78303 - May 25, 16:55 UTCMay 25, 17:50 UTC55m
2026-05-25 N78303 - May 25, 01:55 UTCMay 25, 04:20 UTC2h 25m
2026-05-24 N78303 CLM → CLM May 24, 23:30 UTCMay 24, 23:46 UTC16m
2026-05-24 N78303 - May 24, 19:40 UTCMay 24, 21:45 UTC2h 5m
2026-05-24 N78303 - May 24, 17:45 UTCMay 24, 18:25 UTC40m
2026-05-24 N78303 - May 24, 16:15 UTCMay 24, 17:05 UTC50m
2026-05-23 N78303 CLM → CLM May 23, 18:35 UTCMay 23, 19:15 UTC40m
2026-05-22 N78303 - May 22, 23:00 UTCMay 22, 23:55 UTC55m
2026-05-22 N78303 CLM → TWD May 22, 21:30 UTCMay 22, 21:50 UTC20m
2026-05-22 N78303 - May 22, 18:45 UTCMay 22, 20:25 UTC1h 40m
2026-05-22 N78303 CLM → CLM May 22, 17:35 UTCMay 22, 17:50 UTC15m
2026-05-22 N78303 - May 22, 00:55 UTCMay 22, 01:35 UTC40m
2026-05-21 N78303 - May 21, 23:55 UTCMay 22, 00:35 UTC40m
2026-05-21 N78303 CLM → CLM May 21, 22:00 UTCMay 21, 22:50 UTC50m
2026-05-21 N78303 CLM → CLM May 21, 19:30 UTCMay 21, 21:10 UTC1h 40m
2026-05-21 N78303 - May 21, 16:40 UTCMay 21, 18:15 UTC1h 35m
2026-05-21 N78303 - May 21, 15:30 UTCMay 21, 16:05 UTC35m
2026-05-21 N78303 CLM → BFI May 21, 14:20 UTCMay 21, 15:00 UTC40m
2026-05-21 N78303 CLM → CLM May 21, 00:05 UTCMay 21, 01:35 UTC1h 30m
2026-05-20 N78303 - May 20, 22:00 UTCMay 20, 23:15 UTC1h 15m
2026-05-20 N78303 CLM → CLM May 20, 21:15 UTCMay 20, 21:30 UTC15m
2026-05-20 N78303 CLM → CLM May 20, 20:25 UTCMay 20, 21:05 UTC40m
2026-05-20 N78303 CLM → CLM May 20, 17:20 UTCMay 20, 19:05 UTC1h 45m
2026-05-20 N78303 - May 20, 15:15 UTCMay 20, 16:55 UTC1h 40m
2026-05-20 N78303 - May 20, 02:05 UTCMay 20, 02:35 UTC30m
2026-05-20 N78303 - May 20, 00:35 UTCMay 20, 01:15 UTC40m
2026-05-19 N78303 - May 19, 23:25 UTCMay 19, 23:45 UTC20m
2026-05-19 N78303 - May 19, 22:20 UTCMay 19, 23:05 UTC45m
2026-05-19 N78303 - May 19, 21:10 UTCMay 19, 21:45 UTC35m
2026-05-19 N78303 CLM → BFI May 19, 19:50 UTCMay 19, 20:35 UTC45m
2026-05-17 N78303 - May 17, 17:25 UTCMay 17, 21:10 UTC3h 45m
2026-05-15 N78303 CLM → CLM May 15, 22:50 UTCMay 15, 23:20 UTC30m
2026-05-15 N78303 SQV → CLM May 15, 22:00 UTCMay 15, 22:25 UTC25m
2026-05-15 N78303 - May 15, 18:55 UTCMay 15, 21:00 UTC2h 5m
2026-05-15 N78303 - May 15, 17:40 UTCMay 15, 18:25 UTC45m
2026-05-15 N78303 - May 15, 00:30 UTCMay 15, 01:35 UTC1h 5m
2026-05-14 N78303 - May 14, 23:15 UTCMay 15, 00:00 UTC45m
2026-05-14 N78303 CLM → CLM May 14, 20:05 UTCMay 14, 20:45 UTC40m
2026-05-14 N78303 TIW → CLM May 14, 18:25 UTCMay 14, 19:10 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 N78303 page for operator, model, and routing details .

Mode-S AA9E1F frequently asked

What is Mode-S code AA9E1F?
AA9E1F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N78303.
Where is Mode-S AA9E1F registered?
Mode-S code AA9E1F 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 AA9E1F broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA9E1F, octal 52517037, decimal 11,181,599.
What flights does AA9E1F operate?
Mode-S AA9E1F has broadcast 1 distinct callsign, including N78303.