Apparatus

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sensors Mode-S transponder

A531A4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4337V · PIPER PA-28-140/150/160/180 · operated by THUNDERBIRD AIRCRAFT CO

Hex
A531A4
Octal
51230644
Decimal
10,826,148
Country
US
Tail
N4337V
Type
P28A
No current signal · last broadcast Jul 25, 15:55 UTC
Flights observed
140
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 15:55 UTC

Last known position

Most recent position reported by Mode-S A531A4.

Country allocation

The ICAO 24-bit address A531A4 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
N4337V - 140 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N4337V MIC → MIC Jul 25, 14:40 UTCJul 25, 15:55 UTC1h 15m
2026-07-24 N4337V - Jul 24, 15:00 UTCJul 24, 15:45 UTC45m
2026-07-24 N4337V - Jul 24, 02:45 UTCJul 24, 03:40 UTC55m
2026-07-23 N4337V - Jul 23, 21:45 UTCJul 23, 22:35 UTC50m
2026-07-23 N4337V - Jul 23, 20:10 UTCJul 23, 20:35 UTC25m
2026-07-23 N4337V - Jul 23, 14:15 UTCJul 23, 15:00 UTC45m
2026-07-23 N4337V - Jul 23, 02:30 UTCJul 23, 03:00 UTC30m
2026-07-23 N4337V - Jul 23, 01:25 UTCJul 23, 01:50 UTC25m
2026-07-23 N4337V - Jul 23, 00:15 UTCJul 23, 00:50 UTC35m
2026-07-22 N4337V - Jul 22, 18:15 UTCJul 22, 19:00 UTC45m
2026-07-22 N4337V - Jul 22, 16:45 UTCJul 22, 17:35 UTC50m
2026-07-22 N4337V - Jul 22, 14:55 UTCJul 22, 16:15 UTC1h 20m
2026-07-21 N4337V - Jul 21, 18:55 UTCJul 21, 20:00 UTC1h 5m
2026-07-21 N4337V MIC → MIC Jul 21, 17:15 UTCJul 21, 17:35 UTC20m
2026-07-20 N4337V - Jul 20, 16:35 UTCJul 20, 17:40 UTC1h 5m
2026-07-20 N4337V - Jul 20, 14:30 UTCJul 20, 15:50 UTC1h 20m
2026-07-19 N4337V MIC → MIC Jul 19, 18:30 UTCJul 19, 19:20 UTC50m
2026-07-19 N4337V MIC → MIC Jul 19, 03:25 UTCJul 19, 04:15 UTC50m
2026-07-18 N4337V - Jul 18, 16:50 UTCJul 18, 17:40 UTC50m
2026-07-18 N4337V - Jul 18, 13:15 UTCJul 18, 13:50 UTC35m
2026-07-14 N4337V MIC → MIC Jul 14, 16:35 UTCJul 14, 18:00 UTC1h 25m
2026-07-14 N4337V - Jul 14, 14:45 UTCJul 14, 15:55 UTC1h 10m
2026-07-14 N4337V - Jul 14, 12:40 UTCJul 14, 13:50 UTC1h 10m
2026-07-13 N4337V - Jul 13, 20:40 UTCJul 13, 21:50 UTC1h 10m
2026-07-13 N4337V MIC → MIC Jul 13, 16:20 UTCJul 13, 17:20 UTC1h 0m
2026-07-13 N4337V MIC → MIC Jul 13, 12:40 UTCJul 13, 12:55 UTC15m
2026-07-13 N4337V MIC → MIC Jul 13, 03:10 UTCJul 13, 06:25 UTC3h 15m
2026-07-12 N4337V - Jul 12, 17:15 UTCJul 12, 18:10 UTC55m
2026-07-12 N4337V - Jul 12, 13:55 UTCJul 12, 14:30 UTC35m
2026-07-11 N4337V - Jul 11, 17:05 UTCJul 11, 20:50 UTC3h 45m
2026-07-11 N4337V - Jul 11, 14:40 UTCJul 11, 16:00 UTC1h 20m
2026-07-11 N4337V - Jul 11, 13:15 UTCJul 11, 13:50 UTC35m
2026-07-11 N4337V - Jul 11, 04:30 UTCJul 11, 07:10 UTC2h 40m
2026-07-11 N4337V MIC → MIC Jul 11, 03:05 UTCJul 11, 03:20 UTC15m
2026-07-10 N4337V - Jul 10, 23:10 UTCJul 10, 23:55 UTC45m
2026-07-10 N4337V - Jul 10, 13:40 UTCJul 10, 14:25 UTC45m
2026-07-10 N4337V - Jul 10, 00:45 UTCJul 10, 01:35 UTC50m
2026-07-09 N4337V - Jul 9, 23:25 UTCJul 10, 00:00 UTC35m
2026-07-09 N4337V - Jul 9, 17:40 UTCJul 9, 18:15 UTC35m
2026-07-09 N4337V - Jul 9, 16:10 UTCJul 9, 17:00 UTC50m
2026-07-08 N4337V - Jul 8, 22:30 UTCJul 8, 23:05 UTC35m
2026-07-08 N4337V MIC → MIC Jul 8, 20:40 UTCJul 8, 21:45 UTC1h 5m
2026-07-08 N4337V MIC → MIC Jul 8, 18:30 UTCJul 8, 19:00 UTC30m
2026-07-07 N4337V MIC → MIC Jul 7, 21:25 UTCJul 7, 22:50 UTC1h 25m
2026-07-07 N4337V MIC → MIC Jul 7, 18:40 UTCJul 7, 19:45 UTC1h 5m
2026-07-07 N4337V MIC → MIC Jul 7, 16:40 UTCJul 7, 17:45 UTC1h 5m
2026-07-07 N4337V - Jul 7, 14:30 UTCJul 7, 16:00 UTC1h 30m
2026-07-06 N4337V - Jul 6, 19:25 UTCJul 6, 20:50 UTC1h 25m
2026-07-06 N4337V MIC → MIC Jul 6, 16:50 UTCJul 6, 17:45 UTC55m
2026-07-05 N4337V - Jul 5, 19:40 UTCJul 5, 21:05 UTC1h 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 N4337V page for operator, model, and routing details .

Mode-S A531A4 frequently asked

What is Mode-S code A531A4?
A531A4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4337V.
Where is Mode-S A531A4 registered?
Mode-S code A531A4 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 A531A4 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 15:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A531A4, octal 51230644, decimal 10,826,148.
What flights does A531A4 operate?
Mode-S A531A4 has broadcast 1 distinct callsign, including N4337V.