Apparatus

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sensors Mode-S transponder

39C994

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-HSMU · AIRBUS HELICOPTERS EC-145

Hex
39C994
Octal
16344624
Decimal
3,787,156
Country
FR
Tail
F-HSMU
Type
EC45
No current signal · last broadcast 1d ago
Flights observed
9
Distinct callsigns
1
Country
FR
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 39C994.

Country allocation

The ICAO 24-bit address 39C994 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 1 distinct

Callsign Airline Flights Last seen
SAMU69 - 9 2026-04-13

Recent flights last 9

DateFlightRouteTakeoffLandingDuration
2026-04-13 SAMU69 - Apr 13, 17:15 UTCApr 13, 17:45 UTC30m
2026-04-13 SAMU69 - Apr 13, 15:55 UTCApr 13, 16:15 UTC20m
2026-04-13 SAMU69 - Apr 13, 15:00 UTCApr 13, 15:45 UTC45m
2026-04-13 SAMU69 - Apr 13, 13:45 UTCApr 13, 14:15 UTC30m
2026-04-13 SAMU69 - Apr 13, 13:05 UTCApr 13, 13:20 UTC15m
2026-04-13 SAMU69 - Apr 13, 11:55 UTCApr 13, 12:15 UTC20m
2026-04-13 SAMU69 - Apr 13, 10:00 UTCApr 13, 10:10 UTC10m
2026-04-13 SAMU69 - Apr 13, 09:15 UTCApr 13, 09:25 UTC10m
2026-04-13 SAMU69 - Apr 13, 06:00 UTCApr 13, 06:20 UTC19m

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-HSMU page for operator, model, and routing details .

Mode-S 39C994 frequently asked

What is Mode-S code 39C994?
39C994 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HSMU.
Where is Mode-S 39C994 registered?
Mode-S code 39C994 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 39C994 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 39C994, octal 16344624, decimal 3,787,156.
What flights does 39C994 operate?
Mode-S 39C994 has broadcast 1 distinct callsign, including SAMU69.