Apparatus

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sensors Mode-S transponder

A3A78E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N33439 · operated by WHITEHEAD CHRISTOPHER L

Hex
A3A78E
Octal
50723616
Decimal
10,725,262
Country
US
Tail
N33439
Type
P28A
No current signal · last broadcast 17h ago
Flights observed
188
Distinct callsigns
1
Country
US
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S A3A78E.

Country allocation

The ICAO 24-bit address A3A78E 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
N33439 - 188 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N33439 FTY → FTY Jul 26, 16:20 UTCJul 26, 19:40 UTC3h 20m
2026-07-23 N33439 FTY → FTY Jul 23, 19:35 UTCJul 23, 20:20 UTC45m
2026-07-18 N33439 - Jul 18, 17:00 UTCJul 18, 17:25 UTC25m
2026-07-18 N33439 FTY → FTY Jul 18, 16:35 UTCJul 18, 16:50 UTC15m
2026-07-18 N33439 FTY → FTY Jul 18, 14:00 UTCJul 18, 15:00 UTC1h 0m
2026-07-17 N33439 FTY → FTY Jul 17, 23:05 UTCJul 17, 23:25 UTC20m
2026-07-17 N33439 FTY → FTY Jul 17, 14:39 UTCJul 17, 15:20 UTC40m
2026-07-17 N33439 FTY → FTY Jul 17, 11:30 UTCJul 17, 12:35 UTC1h 5m
2026-07-16 N33439 - Jul 16, 15:10 UTCJul 16, 15:19 UTC10m
2026-07-16 N33439 FTY → FTY Jul 16, 14:10 UTCJul 16, 15:05 UTC55m
2026-07-16 N33439 FTY → FTY Jul 16, 11:34 UTCJul 16, 12:49 UTC1h 15m
2026-07-12 N33439 FTY → FTY Jul 12, 13:35 UTCJul 12, 14:45 UTC1h 10m
2026-07-11 N33439 FTY → FTY Jul 11, 12:00 UTCJul 11, 13:00 UTC1h 0m
2026-07-10 N33439 FTY → FTY Jul 10, 14:00 UTCJul 10, 15:15 UTC1h 15m
2026-07-10 N33439 FTY → FTY Jul 10, 11:45 UTCJul 10, 12:30 UTC45m
2026-07-09 N33439 - Jul 9, 17:25 UTCJul 9, 17:50 UTC25m
2026-07-09 N33439 FTY → FTY Jul 9, 13:50 UTCJul 9, 15:10 UTC1h 20m
2026-07-08 N33439 FTY → FTY Jul 8, 19:20 UTCJul 8, 20:40 UTC1h 20m
2026-07-08 N33439 FTY → FTY Jul 8, 16:35 UTCJul 8, 17:45 UTC1h 10m
2026-07-08 N33439 FTY → FTY Jul 8, 11:30 UTCJul 8, 13:40 UTC2h 10m
2026-07-07 N33439 FTY → FTY Jul 7, 21:10 UTCJul 7, 21:55 UTC45m
2026-07-07 N33439 FTY → FTY Jul 7, 12:30 UTCJul 7, 12:45 UTC15m
2026-07-07 N33439 FTY → FTY Jul 7, 11:55 UTCJul 7, 12:25 UTC30m
2026-07-03 N33439 FTY → FTY Jul 3, 14:50 UTCJul 3, 15:50 UTC1h 0m
2026-07-03 N33439 FTY → FTY Jul 3, 12:05 UTCJul 3, 12:45 UTC40m
2026-07-02 N33439 FTY → FTY Jul 2, 21:40 UTCJul 2, 21:55 UTC15m
2026-07-02 N33439 FTY → FTY Jul 2, 18:30 UTCJul 2, 20:05 UTC1h 35m
2026-07-02 N33439 - Jul 2, 17:00 UTCJul 2, 17:10 UTC10m
2026-07-02 N33439 - Jul 2, 16:25 UTCJul 2, 16:55 UTC30m
2026-07-02 N33439 FTY → FTY Jul 2, 14:15 UTCJul 2, 15:50 UTC1h 35m
2026-07-02 N33439 FTY → FTY Jul 2, 11:40 UTCJul 2, 13:05 UTC1h 25m
2026-07-01 N33439 FTY → FTY Jul 1, 15:10 UTCJul 1, 15:30 UTC20m
2026-07-01 N33439 FTY → FTY Jul 1, 14:50 UTCJul 1, 15:05 UTC15m
2026-07-01 N33439 - Jul 1, 04:55 UTCJul 1, 06:00 UTC1h 5m
2026-06-30 N33439 - Jun 30, 23:35 UTCJul 1, 00:40 UTC1h 5m
2026-06-30 N33439 FTY → FTY Jun 30, 19:10 UTCJun 30, 20:30 UTC1h 20m
2026-06-30 N33439 FTY → FTY Jun 30, 15:35 UTCJun 30, 15:50 UTC15m
2026-06-30 N33439 FTY → FTY Jun 30, 14:20 UTCJun 30, 15:15 UTC55m
2026-06-30 N33439 FTY → FTY Jun 30, 11:25 UTCJun 30, 12:55 UTC1h 30m
2026-06-30 N33439 FTY → FTY Jun 30, 00:49 UTCJun 30, 02:15 UTC1h 26m
2026-06-29 N33439 FTY → FTY Jun 29, 18:44 UTCJun 29, 20:40 UTC1h 55m
2026-06-29 N33439 FTY → FTY Jun 29, 15:00 UTCJun 29, 16:44 UTC1h 45m
2026-06-29 N33439 FTY → FTY Jun 29, 11:35 UTCJun 29, 13:04 UTC1h 30m
2026-06-28 N33439 FTY → FTY Jun 28, 16:25 UTCJun 28, 17:00 UTC35m
2026-06-28 N33439 FTY → FTY Jun 28, 14:09 UTCJun 28, 15:40 UTC1h 30m
2026-06-27 N33439 - Jun 27, 22:25 UTCJun 27, 23:10 UTC45m
2026-06-25 N33439 - Jun 25, 21:25 UTCJun 25, 21:59 UTC35m
2026-06-23 N33439 FTY → FTY Jun 23, 21:24 UTCJun 23, 22:34 UTC1h 10m
2026-06-19 N33439 FTY → FTY Jun 19, 21:19 UTCJun 19, 21:44 UTC25m
2026-06-15 N33439 FTY → FTY Jun 15, 14:24 UTCJun 15, 15:15 UTC50m

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 N33439 page for operator, model, and routing details .

Mode-S A3A78E frequently asked

What is Mode-S code A3A78E?
A3A78E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N33439.
Where is Mode-S A3A78E registered?
Mode-S code A3A78E 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 A3A78E broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3A78E, octal 50723616, decimal 10,725,262.
What flights does A3A78E operate?
Mode-S A3A78E has broadcast 1 distinct callsign, including N33439.