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sensors Mode-S transponder

A9E03B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N73519 · CESSNA 172 Skyhawk · operated by USAEROFLIGHT LLC

Hex
A9E03B
Octal
52360073
Decimal
11,132,987
Country
US
Tail
N73519
Type
C172
No current signal · last broadcast 12d ago
Flights observed
167
Distinct callsigns
1
Country
US
Last broadcast
12d ago

Last known position

Most recent position reported by Mode-S A9E03B.

Country allocation

The ICAO 24-bit address A9E03B 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
N73519 - 165 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 N73519 - Jul 22, 17:15 UTCJul 22, 17:35 UTC20m
2026-07-22 N73519 - Jul 22, 11:40 UTCJul 22, 11:55 UTC15m
2026-07-21 N73519 - Jul 21, 14:45 UTCJul 21, 15:20 UTC35m
2026-07-20 N73519 - Jul 20, 14:40 UTCJul 20, 15:35 UTC55m
2026-07-20 N73519 - Jul 20, 11:40 UTCJul 20, 12:55 UTC1h 15m
2026-07-18 N73519 GDC → GDC Jul 18, 20:05 UTCJul 18, 20:30 UTC25m
2026-07-18 N73519 - Jul 18, 17:20 UTCJul 18, 18:00 UTC40m
2026-07-18 N73519 - Jul 18, 14:45 UTCJul 18, 15:30 UTC45m
2026-07-18 N73519 GMU → LQK Jul 18, 01:39 UTCJul 18, 03:15 UTC1h 36m
2026-07-17 N73519 - Jul 17, 19:35 UTCJul 17, 20:10 UTC35m
2026-07-17 N73519 - Jul 17, 17:44 UTCJul 17, 18:29 UTC45m
2026-07-17 N73519 - Jul 17, 11:35 UTCJul 17, 12:30 UTC55m
2026-07-16 - GDC → GDC Jul 16, 20:55 UTCJul 16, 21:05 UTC10m
2026-07-16 N73519 - Jul 16, 20:00 UTCJul 16, 20:25 UTC25m
2026-07-16 N73519 - Jul 16, 17:54 UTCJul 16, 18:40 UTC45m
2026-07-16 N73519 - Jul 16, 13:00 UTCJul 16, 13:15 UTC15m
2026-07-15 N73519 - Jul 15, 18:05 UTCJul 15, 18:45 UTC40m
2026-07-15 N73519 - Jul 15, 12:15 UTCJul 15, 12:40 UTC25m
2026-07-09 N73519 - Jul 9, 14:30 UTCJul 9, 15:25 UTC55m
2026-07-08 - - Jul 8, 20:15 UTCJul 8, 20:25 UTC10m
2026-07-08 N73519 - Jul 8, 11:00 UTCJul 8, 12:15 UTC1h 15m
2026-07-06 N73519 - Jul 6, 16:55 UTCJul 6, 17:40 UTC45m
2026-07-06 N73519 - Jul 6, 12:05 UTCJul 6, 12:15 UTC10m
2026-07-03 N73519 - Jul 3, 17:05 UTCJul 3, 19:10 UTC2h 5m
2026-07-03 N73519 - Jul 3, 14:30 UTCJul 3, 14:40 UTC10m
2026-07-03 N73519 - Jul 3, 12:20 UTCJul 3, 13:30 UTC1h 10m
2026-07-02 N73519 - Jul 2, 23:00 UTCJul 2, 23:15 UTC15m
2026-07-02 N73519 - Jul 2, 16:55 UTCJul 2, 17:05 UTC10m
2026-07-02 N73519 - Jul 2, 11:55 UTCJul 2, 12:05 UTC10m
2026-07-01 N73519 GDC → GMU Jul 1, 20:55 UTCJul 1, 21:25 UTC30m
2026-07-01 N73519 - Jul 1, 19:50 UTCJul 1, 20:20 UTC30m
2026-07-01 N73519 - Jul 1, 17:20 UTCJul 1, 18:20 UTC1h 0m
2026-07-01 N73519 - Jul 1, 14:55 UTCJul 1, 15:10 UTC15m
2026-06-30 N73519 - Jun 30, 20:10 UTCJun 30, 20:35 UTC25m
2026-06-30 N73519 - Jun 30, 17:10 UTCJun 30, 18:05 UTC55m
2026-06-29 N73519 GDC → GMU Jun 29, 18:14 UTCJun 29, 18:49 UTC35m
2026-06-29 N73519 - Jun 29, 14:54 UTCJun 29, 15:00 UTC5m
2026-06-29 N73519 - Jun 29, 11:50 UTCJun 29, 12:55 UTC1h 5m
2026-06-27 N73519 - Jun 27, 17:34 UTCJun 27, 18:49 UTC1h 15m
2026-06-27 N73519 - Jun 27, 14:39 UTCJun 27, 15:05 UTC25m
2026-06-27 N73519 - Jun 27, 11:44 UTCJun 27, 12:19 UTC35m
2026-06-26 N73519 - Jun 26, 19:45 UTCJun 26, 20:15 UTC30m
2026-06-25 N73519 - Jun 25, 17:20 UTCJun 25, 18:50 UTC1h 30m
2026-06-24 N73519 - Jun 24, 19:49 UTCJun 24, 21:04 UTC1h 15m
2026-06-24 N73519 - Jun 24, 17:55 UTCJun 24, 18:34 UTC40m
2026-06-24 N73519 - Jun 24, 14:39 UTCJun 24, 15:44 UTC1h 5m
2026-06-18 N73519 - Jun 18, 14:40 UTCJun 18, 15:30 UTC50m
2026-06-17 N73519 GMU → GMU Jun 17, 19:10 UTCJun 17, 19:45 UTC35m
2026-06-17 N73519 - Jun 17, 14:15 UTCJun 17, 15:50 UTC1h 35m
2026-06-17 N73519 - Jun 17, 12:00 UTCJun 17, 12:55 UTC55m

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 N73519 page for operator, model, and routing details .

Mode-S A9E03B frequently asked

What is Mode-S code A9E03B?
A9E03B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N73519.
Where is Mode-S A9E03B registered?
Mode-S code A9E03B 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 A9E03B broadcasting right now?
No active broadcast right now. Last signal was 12d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9E03B, octal 52360073, decimal 11,132,987.
What flights does A9E03B operate?
Mode-S A9E03B has broadcast 1 distinct callsign, including N73519.