Apparatus

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sensors Mode-S transponder

39AC43

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-HLCD · AIRBUS HELICOPTERS EC-135/635

Hex
39AC43
Octal
16326103
Decimal
3,779,651
Country
FR
Tail
F-HLCD
Type
EC35
No current signal · last broadcast 4h ago
Flights observed
42
Distinct callsigns
4
Country
FR
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 39AC43.

Country allocation

The ICAO 24-bit address 39AC43 falls within the block assigned to France (FR) by ICAO Annex 10, Volume III. Every aircraft registered in France 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 4 distinct

Callsign Airline Flights Last seen
SAMU03A - 23 2026-06-21
FHLCD00 - 14 2026-05-12
FHLCD - 4 2026-06-14
FHLCD2 - 1 2026-05-28

Recent flights last 42

DateFlightRouteTakeoffLandingDuration
2026-06-21 SAMU03A - Jun 21, 09:24 UTCJun 21, 09:35 UTC10m
2026-06-20 SAMU03A - Jun 20, 17:19 UTCJun 20, 17:34 UTC15m
2026-06-20 SAMU03A - Jun 20, 16:09 UTCJun 20, 16:24 UTC15m
2026-06-20 SAMU03A - Jun 20, 15:14 UTCJun 20, 15:24 UTC10m
2026-06-20 SAMU03A - Jun 20, 10:55 UTCJun 20, 11:05 UTC10m
2026-06-20 SAMU03A - Jun 20, 07:04 UTCJun 20, 07:14 UTC10m
2026-06-18 SAMU03A - Jun 18, 16:05 UTCJun 18, 16:50 UTC45m
2026-06-18 SAMU03A - Jun 18, 14:05 UTCJun 18, 14:15 UTC10m
2026-06-18 SAMU03A - Jun 18, 13:10 UTCJun 18, 13:25 UTC15m
2026-06-18 SAMU03A - Jun 18, 11:55 UTCJun 18, 12:15 UTC20m
2026-06-18 SAMU03A - Jun 18, 10:35 UTCJun 18, 10:45 UTC10m
2026-06-18 SAMU03A - Jun 18, 06:55 UTCJun 18, 07:25 UTC30m
2026-06-16 SAMU03A - Jun 16, 17:05 UTCJun 16, 17:15 UTC10m
2026-06-16 SAMU03A - Jun 16, 10:20 UTCJun 16, 10:35 UTC15m
2026-06-16 SAMU03A - Jun 16, 09:25 UTCJun 16, 09:50 UTC25m
2026-06-16 SAMU03A - Jun 16, 08:39 UTCJun 16, 08:49 UTC10m
2026-06-15 SAMU03A - Jun 15, 17:10 UTCJun 15, 17:25 UTC15m
2026-06-15 SAMU03A - Jun 15, 16:15 UTCJun 15, 16:30 UTC15m
2026-06-15 SAMU03A - Jun 15, 14:40 UTCJun 15, 15:00 UTC20m
2026-06-15 SAMU03A - Jun 15, 06:49 UTCJun 15, 07:00 UTC10m
2026-06-14 SAMU03A - Jun 14, 17:10 UTCJun 14, 17:20 UTC10m
2026-06-14 SAMU03A - Jun 14, 14:40 UTCJun 14, 15:00 UTC20m
2026-06-14 SAMU03A - Jun 14, 11:45 UTCJun 14, 12:05 UTC20m
2026-06-14 FHLCD - Jun 14, 10:30 UTCJun 14, 11:10 UTC40m
2026-06-12 FHLCD - Jun 12, 07:00 UTCJun 12, 07:30 UTC30m
2026-06-02 FHLCD - Jun 2, 08:25 UTCJun 2, 08:45 UTC20m
2026-05-28 FHLCD2 - May 28, 07:55 UTCMay 28, 09:35 UTC1h 40m
2026-05-13 FHLCD - May 13, 08:10 UTCMay 13, 09:25 UTC1h 15m
2026-05-12 FHLCD00 - May 12, 08:20 UTCMay 12, 09:50 UTC1h 30m
2026-05-11 FHLCD00 - May 11, 11:00 UTCMay 11, 11:30 UTC30m
2026-05-11 FHLCD00 - May 11, 09:00 UTCMay 11, 09:20 UTC20m
2026-05-08 FHLCD00 - May 8, 07:24 UTCMay 8, 07:55 UTC30m
2026-05-08 FHLCD00 - May 8, 06:30 UTCMay 8, 06:39 UTC10m
2026-05-07 FHLCD00 - May 7, 20:20 UTCMay 7, 21:25 UTC1h 5m
2026-05-07 FHLCD00 - May 7, 16:05 UTCMay 7, 17:30 UTC1h 25m
2026-05-07 FHLCD00 - May 7, 12:10 UTCMay 7, 12:25 UTC15m
2026-05-07 FHLCD00 - May 7, 10:40 UTCMay 7, 11:00 UTC20m
2026-05-07 FHLCD00 - May 7, 09:50 UTCMay 7, 10:05 UTC15m
2026-05-07 FHLCD00 - May 7, 08:55 UTCMay 7, 09:15 UTC20m
2026-05-06 FHLCD00 - May 6, 09:45 UTCMay 6, 10:01 UTC15m
2026-05-06 FHLCD00 - May 6, 08:50 UTCMay 6, 09:10 UTC20m
2026-05-05 FHLCD00 - May 5, 07:15 UTCMay 5, 08:35 UTC1h 20m

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 F-HLCD page for operator, model, and routing details .

Mode-S 39AC43 frequently asked

What is Mode-S code 39AC43?
39AC43 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HLCD.
Where is Mode-S 39AC43 registered?
Mode-S code 39AC43 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 39AC43 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 39AC43, octal 16326103, decimal 3,779,651.
What flights does 39AC43 operate?
Mode-S 39AC43 has broadcast 4 distinct callsigns, including SAMU03A, FHLCD00, FHLCD, FHLCD2.