Apparatus

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sensors Mode-S transponder

A2F3D4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N29HD · AEROSPATIALE AS-350 Ecureuil · operated by HELINET AVIATION SERVICES LLC

Hex
A2F3D4
Octal
50571724
Decimal
10,679,252
Country
US
Tail
N29HD
Type
AS50
No current signal · last broadcast 4d ago
Flights observed
98
Distinct callsigns
1
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S A2F3D4.

Country allocation

The ICAO 24-bit address A2F3D4 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
N29HD - 98 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 N29HD - Jul 16, 21:25 UTCJul 16, 23:15 UTC1h 50m
2026-07-16 N29HD - Jul 16, 19:30 UTCJul 16, 19:45 UTC15m
2026-07-13 N29HD ONT → VNY Jul 13, 23:00 UTCJul 14, 00:40 UTC1h 40m
2026-07-13 N29HD VNY → ONT Jul 13, 21:35 UTCJul 13, 22:20 UTC45m
2026-07-10 N29HD - Jul 10, 23:40 UTCJul 11, 01:05 UTC1h 25m
2026-07-10 N29HD - Jul 10, 21:20 UTCJul 10, 23:00 UTC1h 40m
2026-07-10 N29HD VNY → VNY Jul 10, 19:55 UTCJul 10, 20:25 UTC30m
2026-07-10 N29HD VNY → VNY Jul 10, 17:50 UTCJul 10, 18:35 UTC45m
2026-07-03 N29HD - Jul 3, 20:25 UTCJul 3, 21:40 UTC1h 15m
2026-07-02 N29HD - Jul 2, 20:40 UTCJul 2, 22:00 UTC1h 20m
2026-06-30 N29HD - Jun 30, 21:35 UTCJun 30, 21:45 UTC10m
2026-06-24 N29HD - Jun 24, 18:55 UTCJun 24, 19:59 UTC1h 5m
2026-06-22 N29HD - Jun 22, 18:40 UTCJun 22, 18:54 UTC15m
2026-06-19 N29HD - Jun 19, 11:20 UTCJun 19, 11:45 UTC25m
2026-06-17 N29HD - Jun 17, 23:20 UTCJun 18, 00:35 UTC1h 15m
2026-06-16 N29HD - Jun 16, 22:35 UTCJun 16, 22:45 UTC10m
2026-06-13 N29HD - Jun 13, 05:05 UTCJun 13, 05:15 UTC10m
2026-06-13 N29HD VNY → VNY Jun 13, 02:50 UTCJun 13, 03:20 UTC30m
2026-06-12 N29HD - Jun 12, 23:55 UTCJun 13, 01:15 UTC1h 20m
2026-06-12 N29HD - Jun 12, 21:40 UTCJun 12, 23:10 UTC1h 30m
2026-06-12 N29HD - Jun 12, 03:45 UTCJun 12, 04:05 UTC20m
2026-06-11 N29HD - Jun 11, 22:50 UTCJun 11, 23:35 UTC45m
2026-06-11 N29HD - Jun 11, 16:40 UTCJun 11, 18:50 UTC2h 10m
2026-06-11 N29HD - Jun 11, 15:10 UTCJun 11, 16:10 UTC1h 0m
2026-06-11 N29HD - Jun 11, 12:30 UTCJun 11, 14:00 UTC1h 30m
2026-06-11 N29HD - Jun 11, 00:50 UTCJun 11, 01:00 UTC10m
2026-06-10 N29HD VNY → LGB Jun 10, 22:40 UTCJun 11, 00:05 UTC1h 25m
2026-06-10 N29HD - Jun 10, 17:00 UTCJun 10, 18:40 UTC1h 40m
2026-06-05 N29HD - Jun 5, 21:00 UTCJun 6, 00:20 UTC3h 20m
2026-06-05 N29HD VNY → VNY Jun 5, 19:50 UTCJun 5, 20:50 UTC1h 0m
2026-06-04 N29HD - Jun 4, 22:25 UTCJun 4, 23:15 UTC50m
2026-06-04 N29HD - Jun 4, 05:00 UTCJun 4, 05:35 UTC35m
2026-06-04 N29HD - Jun 4, 02:30 UTCJun 4, 03:05 UTC35m
2026-06-04 N29HD - Jun 4, 00:30 UTCJun 4, 01:35 UTC1h 5m
2026-06-03 N29HD - Jun 3, 17:40 UTCJun 3, 19:05 UTC1h 25m
2026-06-03 N29HD - Jun 3, 00:45 UTCJun 3, 01:30 UTC45m
2026-06-02 N29HD VNY → VNY Jun 2, 23:00 UTCJun 2, 23:10 UTC10m
2026-05-29 N29HD - May 29, 04:55 UTCMay 29, 05:35 UTC40m
2026-05-28 N29HD - May 28, 23:50 UTCMay 29, 01:00 UTC1h 10m
2026-05-28 N29HD - May 28, 21:35 UTCMay 28, 23:15 UTC1h 40m
2026-05-28 N29HD - May 28, 16:20 UTCMay 28, 16:40 UTC20m
2026-05-28 N29HD VNY → VNY May 28, 03:10 UTCMay 28, 03:20 UTC10m
2026-05-27 N29HD WHP → VNY May 27, 21:20 UTCMay 27, 21:35 UTC15m
2026-05-27 N29HD - May 27, 04:04 UTCMay 27, 04:45 UTC40m
2026-05-25 N29HD - May 25, 05:55 UTCMay 25, 06:55 UTC1h 0m
2026-05-25 N29HD - May 25, 03:05 UTCMay 25, 04:50 UTC1h 45m
2026-05-24 N29HD - May 24, 05:25 UTCMay 24, 07:00 UTC1h 35m
2026-05-24 N29HD - May 24, 02:50 UTCMay 24, 04:00 UTC1h 10m
2026-05-24 N29HD - May 24, 00:45 UTCMay 24, 01:45 UTC1h 0m
2026-05-23 N29HD - May 23, 22:50 UTCMay 23, 23:40 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 N29HD page for operator, model, and routing details .

Mode-S A2F3D4 frequently asked

What is Mode-S code A2F3D4?
A2F3D4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N29HD.
Where is Mode-S A2F3D4 registered?
Mode-S code A2F3D4 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 A2F3D4 broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2F3D4, octal 50571724, decimal 10,679,252.
What flights does A2F3D4 operate?
Mode-S A2F3D4 has broadcast 1 distinct callsign, including N29HD.