Apparatus

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sensors Mode-S transponder

A2D554

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2819Q · CESSNA 172 Skyhawk · operated by AIRBORNE LLC

Hex
A2D554
Octal
50552524
Decimal
10,671,444
Country
US
Tail
N2819Q
Type
C172
No current signal · last broadcast 2d ago
Flights observed
111
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A2D554.

Country allocation

The ICAO 24-bit address A2D554 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
N2819Q - 111 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 N2819Q - Jul 15, 15:40 UTCJul 15, 16:35 UTC55m
2026-07-14 N2819Q SPZ → SPZ Jul 14, 17:05 UTCJul 14, 17:30 UTC25m
2026-07-14 N2819Q - Jul 14, 14:00 UTCJul 14, 14:50 UTC50m
2026-07-13 N2819Q - Jul 13, 21:10 UTCJul 13, 22:00 UTC50m
2026-07-13 N2819Q - Jul 13, 17:05 UTCJul 13, 17:15 UTC10m
2026-07-13 N2819Q - Jul 13, 15:30 UTCJul 13, 15:50 UTC20m
2026-07-11 N2819Q - Jul 11, 00:05 UTCJul 11, 01:25 UTC1h 20m
2026-07-10 N2819Q SPZ → SPZ Jul 10, 19:40 UTCJul 10, 21:35 UTC1h 55m
2026-07-10 N2819Q SPZ → SPZ Jul 10, 16:05 UTCJul 10, 16:40 UTC35m
2026-07-09 N2819Q - Jul 9, 18:45 UTCJul 9, 19:50 UTC1h 5m
2026-07-09 N2819Q SPZ → SPZ Jul 9, 14:45 UTCJul 9, 15:00 UTC15m
2026-07-08 N2819Q SPZ → SPZ Jul 8, 20:05 UTCJul 8, 20:20 UTC15m
2026-07-08 N2819Q - Jul 8, 17:55 UTCJul 8, 18:40 UTC45m
2026-07-08 N2819Q - Jul 8, 15:40 UTCJul 8, 16:55 UTC1h 15m
2026-07-08 N2819Q - Jul 8, 14:30 UTCJul 8, 15:05 UTC35m
2026-07-07 N2819Q - Jul 7, 22:50 UTCJul 7, 23:30 UTC40m
2026-07-07 N2819Q - Jul 7, 19:35 UTCJul 7, 20:30 UTC55m
2026-07-07 N2819Q SPZ → SPZ Jul 7, 17:35 UTCJul 7, 18:35 UTC1h 0m
2026-07-07 N2819Q SPZ → SPZ Jul 7, 15:25 UTCJul 7, 17:00 UTC1h 35m
2026-07-06 N2819Q - Jul 6, 13:30 UTCJul 6, 16:45 UTC3h 15m
2026-07-04 N2819Q - Jul 4, 14:50 UTCJul 4, 15:45 UTC55m
2026-07-03 N2819Q SPZ → SPZ Jul 3, 20:50 UTCJul 3, 21:40 UTC50m
2026-07-03 N2819Q SPZ → SPZ Jul 3, 18:20 UTCJul 3, 19:20 UTC1h 0m
2026-07-03 N2819Q SPZ → SPZ Jul 3, 16:35 UTCJul 3, 17:00 UTC25m
2026-07-03 N2819Q - Jul 3, 03:00 UTCJul 3, 03:50 UTC50m
2026-07-02 N2819Q - Jul 2, 19:40 UTCJul 2, 20:35 UTC55m
2026-07-02 N2819Q - Jul 2, 16:00 UTCJul 2, 16:40 UTC40m
2026-07-02 N2819Q - Jul 2, 13:45 UTCJul 2, 15:05 UTC1h 20m
2026-07-01 N2819Q SPZ → SPZ Jul 1, 14:40 UTCJul 1, 16:45 UTC2h 5m
2026-07-01 N2819Q - Jul 1, 02:25 UTCJul 1, 02:55 UTC30m
2026-07-01 N2819Q - Jul 1, 01:00 UTCJul 1, 01:20 UTC20m
2026-06-30 N2819Q - Jun 30, 18:25 UTCJun 30, 18:35 UTC10m
2026-06-29 N2819Q - Jun 29, 20:54 UTCJun 29, 22:00 UTC1h 5m
2026-06-28 N2819Q - Jun 28, 19:49 UTCJun 28, 20:54 UTC1h 5m
2026-06-27 N2819Q SPZ → SPZ Jun 27, 22:15 UTCJun 27, 23:19 UTC1h 5m
2026-06-26 N2819Q SPZ → SPZ Jun 26, 19:24 UTCJun 26, 20:29 UTC1h 5m
2026-06-26 N2819Q - Jun 26, 13:10 UTCJun 26, 15:05 UTC1h 55m
2026-06-25 N2819Q SPZ → SPZ Jun 25, 16:45 UTCJun 25, 17:14 UTC30m
2026-06-20 N2819Q SPZ → SPZ Jun 20, 13:34 UTCJun 20, 16:59 UTC3h 25m
2026-06-19 N2819Q - Jun 19, 20:24 UTCJun 19, 22:24 UTC2h 0m
2026-06-16 N2819Q SPZ → SPZ Jun 16, 20:20 UTCJun 16, 21:05 UTC45m
2026-06-16 N2819Q - Jun 16, 17:49 UTCJun 16, 19:10 UTC1h 20m
2026-06-16 N2819Q - Jun 16, 15:45 UTCJun 16, 17:00 UTC1h 15m
2026-06-16 N2819Q - Jun 16, 14:00 UTCJun 16, 15:00 UTC1h 0m
2026-06-16 N2819Q SPZ → SPZ Jun 16, 02:29 UTCJun 16, 03:45 UTC1h 15m
2026-06-15 N2819Q - Jun 15, 20:10 UTCJun 15, 21:14 UTC1h 5m
2026-06-15 N2819Q - Jun 15, 17:50 UTCJun 15, 18:55 UTC1h 5m
2026-06-15 N2819Q - Jun 15, 15:50 UTCJun 15, 17:10 UTC1h 20m
2026-06-15 N2819Q - Jun 15, 13:34 UTCJun 15, 15:10 UTC1h 35m
2026-06-13 N2819Q - Jun 13, 18:50 UTCJun 13, 19:10 UTC20m

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 N2819Q page for operator, model, and routing details .

Mode-S A2D554 frequently asked

What is Mode-S code A2D554?
A2D554 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2819Q.
Where is Mode-S A2D554 registered?
Mode-S code A2D554 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 A2D554 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 A2D554, octal 50552524, decimal 10,671,444.
What flights does A2D554 operate?
Mode-S A2D554 has broadcast 1 distinct callsign, including N2819Q.