Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

39AC4B

ICAO 24-bit transponder address · allocated to France

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

Hex
39AC4B
Octal
16326113
Decimal
3,779,659
Country
FR
Tail
F-HLCL
Type
EC35
No current signal · last broadcast 1d ago
Flights observed
119
Distinct callsigns
1
Country
FR
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 39AC4B.

Country allocation

The ICAO 24-bit address 39AC4B 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
SAMU66 - 118 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 SAMU66 - Jul 22, 14:40 UTCJul 22, 15:15 UTC35m
2026-07-22 SAMU66 - Jul 22, 13:00 UTCJul 22, 13:25 UTC25m
2026-07-21 SAMU66 - Jul 21, 16:00 UTCJul 21, 17:00 UTC1h 0m
2026-07-21 SAMU66 - Jul 21, 14:45 UTCJul 21, 15:20 UTC35m
2026-07-21 SAMU66 - Jul 21, 11:30 UTCJul 21, 11:50 UTC20m
2026-07-19 SAMU66 - Jul 19, 09:55 UTCJul 19, 10:05 UTC10m
2026-07-19 SAMU66 - Jul 19, 08:45 UTCJul 19, 08:55 UTC10m
2026-07-18 SAMU66 - Jul 18, 09:45 UTCJul 18, 10:15 UTC30m
2026-07-17 SAMU66 - Jul 17, 11:30 UTCJul 17, 11:50 UTC20m
2026-07-14 SAMU66 - Jul 14, 13:15 UTCJul 14, 14:00 UTC45m
2026-07-14 SAMU66 - Jul 14, 12:35 UTCJul 14, 13:10 UTC35m
2026-07-14 SAMU66 - Jul 14, 12:15 UTCJul 14, 12:30 UTC15m
2026-07-14 SAMU66 - Jul 14, 08:20 UTCJul 14, 08:35 UTC15m
2026-07-13 SAMU66 - Jul 13, 12:10 UTCJul 13, 12:50 UTC40m
2026-07-13 SAMU66 - Jul 13, 11:35 UTCJul 13, 11:40 UTC5m
2026-07-13 SAMU66 - Jul 13, 10:35 UTCJul 13, 11:10 UTC35m
2026-07-13 SAMU66 - Jul 13, 08:45 UTCJul 13, 08:55 UTC10m
2026-07-13 SAMU66 - Jul 13, 08:15 UTCJul 13, 08:25 UTC10m
2026-07-12 SAMU66 - Jul 12, 16:01 UTCJul 12, 16:15 UTC15m
2026-07-12 SAMU66 - Jul 12, 15:15 UTCJul 12, 15:25 UTC10m
2026-07-11 SAMU66 - Jul 11, 17:05 UTCJul 11, 17:15 UTC10m
2026-07-11 SAMU66 - Jul 11, 16:10 UTCJul 11, 16:25 UTC15m
2026-07-11 SAMU66 - Jul 11, 12:05 UTCJul 11, 12:15 UTC10m
2026-07-10 SAMU66 - Jul 10, 09:10 UTCJul 10, 10:50 UTC1h 40m
2026-07-10 SAMU66 - Jul 10, 07:55 UTCJul 10, 08:05 UTC10m
2026-07-10 SAMU66 - Jul 10, 06:35 UTCJul 10, 06:45 UTC10m
2026-07-09 SAMU66 - Jul 9, 09:30 UTCJul 9, 09:40 UTC10m
2026-07-08 SAMU66 - Jul 8, 10:15 UTCJul 8, 10:45 UTC30m
2026-07-08 SAMU66 - Jul 8, 08:45 UTCJul 8, 08:55 UTC10m
2026-07-07 SAMU66 - Jul 7, 16:45 UTCJul 7, 17:10 UTC25m
2026-07-07 SAMU66 - Jul 7, 15:25 UTCJul 7, 15:35 UTC10m
2026-07-07 SAMU66 - Jul 7, 11:55 UTCJul 7, 12:15 UTC20m
2026-07-07 SAMU66 - Jul 7, 11:00 UTCJul 7, 11:10 UTC10m
2026-07-05 SAMU66 - Jul 5, 11:35 UTCJul 5, 11:55 UTC20m
2026-07-05 SAMU66 - Jul 5, 10:40 UTCJul 5, 10:55 UTC15m
2026-07-04 SAMU66 - Jul 4, 08:40 UTCJul 4, 08:50 UTC10m
2026-07-04 SAMU66 - Jul 4, 06:30 UTCJul 4, 06:40 UTC10m
2026-07-01 SAMU66 - Jul 1, 17:30 UTCJul 1, 18:50 UTC1h 20m
2026-07-01 SAMU66 - Jul 1, 16:45 UTCJul 1, 17:15 UTC30m
2026-07-01 SAMU66 - Jul 1, 15:00 UTCJul 1, 15:10 UTC10m
2026-07-01 SAMU66 - Jul 1, 13:45 UTCJul 1, 13:55 UTC10m
2026-07-01 SAMU66 - Jul 1, 12:15 UTCJul 1, 12:25 UTC10m
2026-07-01 SAMU66 - Jul 1, 10:00 UTCJul 1, 10:30 UTC30m
2026-07-01 SAMU66 - Jul 1, 08:50 UTCJul 1, 09:25 UTC35m
2026-06-29 SAMU66 - Jun 29, 10:15 UTCJun 29, 10:50 UTC35m
2026-06-26 SAMU66 - Jun 26, 18:04 UTCJun 26, 18:15 UTC10m
2026-06-26 SAMU66 - Jun 26, 13:55 UTCJun 26, 14:05 UTC10m
2026-06-26 SAMU66 - Jun 26, 11:14 UTCJun 26, 11:49 UTC35m
2026-06-26 SAMU66 - Jun 26, 09:45 UTCJun 26, 09:59 UTC15m
2026-06-26 SAMU66 - Jun 26, 08:34 UTCJun 26, 08:45 UTC10m

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

Mode-S 39AC4B frequently asked

What is Mode-S code 39AC4B?
39AC4B is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HLCL.
Where is Mode-S 39AC4B registered?
Mode-S code 39AC4B is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 39AC4B 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 39AC4B, octal 16326113, decimal 3,779,659.
What flights does 39AC4B operate?
Mode-S 39AC4B has broadcast 1 distinct callsign, including SAMU66.