Apparatus

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sensors Mode-S transponder

A59D3D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4609Q · CESSNA 172 Skyhawk · operated by N4609Q LLC

Hex
A59D3D
Octal
51316475
Decimal
10,853,693
Country
US
Tail
N4609Q
Type
C172
No current signal · last broadcast 14h ago
Flights observed
155
Distinct callsigns
1
Country
US
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S A59D3D.

Country allocation

The ICAO 24-bit address A59D3D 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
N4609Q - 155 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 N4609Q - May 29, 19:30 UTCMay 29, 20:00 UTC30m
2026-05-29 N4609Q - May 29, 18:15 UTCMay 29, 18:50 UTC35m
2026-05-29 N4609Q - May 29, 13:00 UTCMay 29, 14:00 UTC1h 0m
2026-05-29 N4609Q - May 29, 10:05 UTCMay 29, 11:35 UTC1h 30m
2026-05-28 N4609Q OPF → OPF May 28, 22:20 UTCMay 28, 23:25 UTC1h 5m
2026-05-27 N4609Q OPF → OPF May 27, 22:50 UTCMay 27, 23:25 UTC35m
2026-05-27 N4609Q - May 27, 21:20 UTCMay 27, 21:50 UTC30m
2026-05-27 N4609Q - May 27, 15:45 UTCMay 27, 16:55 UTC1h 10m
2026-05-27 N4609Q - May 27, 12:45 UTCMay 27, 14:05 UTC1h 20m
2026-05-27 N4609Q - May 27, 10:40 UTCMay 27, 11:50 UTC1h 10m
2026-05-26 N4609Q - May 26, 16:40 UTCMay 26, 17:50 UTC1h 10m
2026-05-26 N4609Q - May 26, 13:54 UTCMay 26, 14:45 UTC50m
2026-05-26 N4609Q - May 26, 01:44 UTCMay 26, 02:44 UTC1h 0m
2026-05-25 N4609Q - May 25, 21:40 UTCMay 25, 22:49 UTC1h 10m
2026-05-25 N4609Q OPF → OPF May 25, 18:55 UTCMay 25, 19:50 UTC55m
2026-05-25 N4609Q - May 25, 16:45 UTCMay 25, 17:45 UTC1h 0m
2026-05-25 N4609Q - May 25, 13:55 UTCMay 25, 15:00 UTC1h 5m
2026-05-25 N4609Q OPF → OPF May 25, 11:30 UTCMay 25, 12:40 UTC1h 10m
2026-05-24 N4609Q - May 24, 23:00 UTCMay 24, 23:46 UTC46m
2026-05-24 N4609Q - May 24, 13:30 UTCMay 24, 15:00 UTC1h 30m
2026-05-24 N4609Q - May 24, 11:25 UTCMay 24, 12:15 UTC50m
2026-05-23 N4609Q - May 23, 17:05 UTCMay 23, 17:55 UTC50m
2026-05-23 N4609Q - May 23, 13:40 UTCMay 23, 15:00 UTC1h 20m
2026-05-23 N4609Q OPF → OPF May 23, 11:20 UTCMay 23, 12:00 UTC40m
2026-05-22 N4609Q - May 22, 22:10 UTCMay 22, 23:10 UTC1h 0m
2026-05-22 N4609Q OPF → OPF May 22, 16:50 UTCMay 22, 17:55 UTC1h 5m
2026-05-22 N4609Q - May 22, 14:00 UTCMay 22, 14:45 UTC45m
2026-05-22 N4609Q - May 22, 11:40 UTCMay 22, 12:35 UTC55m
2026-05-22 N4609Q - May 22, 00:35 UTCMay 22, 01:40 UTC1h 5m
2026-05-21 N4609Q - May 21, 21:35 UTCMay 21, 22:55 UTC1h 20m
2026-05-21 N4609Q - May 21, 18:45 UTCMay 21, 20:00 UTC1h 15m
2026-05-21 N4609Q - May 21, 16:40 UTCMay 21, 17:45 UTC1h 5m
2026-05-21 N4609Q - May 21, 13:50 UTCMay 21, 15:00 UTC1h 10m
2026-05-21 N4609Q - May 21, 11:45 UTCMay 21, 12:55 UTC1h 10m
2026-05-21 N4609Q - May 21, 00:30 UTCMay 21, 01:00 UTC30m
2026-05-20 N4609Q - May 20, 22:20 UTCMay 20, 23:30 UTC1h 10m
2026-05-20 N4609Q - May 20, 16:45 UTCMay 20, 17:45 UTC1h 0m
2026-05-20 N4609Q OPF → OPF May 20, 13:45 UTCMay 20, 14:15 UTC30m
2026-05-20 N4609Q - May 20, 11:35 UTCMay 20, 12:55 UTC1h 20m
2026-05-19 N4609Q - May 19, 21:40 UTCMay 19, 22:45 UTC1h 5m
2026-05-19 N4609Q - May 19, 16:45 UTCMay 19, 18:00 UTC1h 15m
2026-05-18 N4609Q OPF → OPF May 18, 13:45 UTCMay 18, 15:00 UTC1h 15m
2026-05-18 N4609Q - May 18, 11:40 UTCMay 18, 12:35 UTC55m
2026-05-17 N4609Q - May 17, 22:15 UTCMay 17, 22:50 UTC35m
2026-05-17 N4609Q OPF → OPF May 17, 16:25 UTCMay 17, 17:55 UTC1h 30m
2026-05-16 N4609Q - May 16, 18:55 UTCMay 16, 20:00 UTC1h 5m
2026-05-16 N4609Q - May 16, 16:55 UTCMay 16, 17:55 UTC1h 0m
2026-05-16 N4609Q - May 16, 11:51 UTCMay 16, 13:35 UTC1h 45m
2026-05-15 N4609Q - May 15, 20:20 UTCMay 15, 22:05 UTC1h 45m
2026-05-15 N4609Q - May 15, 16:55 UTCMay 15, 19:20 UTC2h 25m

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 N4609Q page for operator, model, and routing details .

Mode-S A59D3D frequently asked

What is Mode-S code A59D3D?
A59D3D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4609Q.
Where is Mode-S A59D3D registered?
Mode-S code A59D3D 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 A59D3D broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A59D3D, octal 51316475, decimal 10,853,693.
What flights does A59D3D operate?
Mode-S A59D3D has broadcast 1 distinct callsign, including N4609Q.