Apparatus

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sensors Mode-S transponder

39AC18

ICAO 24-bit transponder address · allocated to France

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

Hex
39AC18
Octal
16326030
Decimal
3,779,608
Country
FR
Tail
F-HLAY
Type
EC45
No current signal · last broadcast 12h ago
Flights observed
247
Distinct callsigns
2
Country
FR
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S 39AC18.

Country allocation

The ICAO 24-bit address 39AC18 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 2 distinct

Callsign Airline Flights Last seen
SAMU26 - 243 2026-07-06
FHLAY - 4 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-06 SAMU26 - Jul 6, 16:35 UTCJul 6, 17:15 UTC40m
2026-07-06 SAMU26 - Jul 6, 16:00 UTCJul 6, 16:10 UTC10m
2026-07-06 SAMU26 - Jul 6, 12:10 UTCJul 6, 12:30 UTC20m
2026-07-05 SAMU26 - Jul 5, 22:10 UTCJul 5, 23:15 UTC1h 5m
2026-07-05 SAMU26 - Jul 5, 16:50 UTCJul 5, 17:00 UTC10m
2026-07-05 SAMU26 - Jul 5, 15:50 UTCJul 5, 16:00 UTC10m
2026-07-05 SAMU26 - Jul 5, 15:10 UTCJul 5, 15:20 UTC10m
2026-07-05 SAMU26 - Jul 5, 10:10 UTCJul 5, 10:35 UTC25m
2026-07-05 SAMU26 - Jul 5, 09:05 UTCJul 5, 09:30 UTC25m
2026-07-05 SAMU26 - Jul 5, 06:55 UTCJul 5, 07:20 UTC25m
2026-07-05 SAMU26 - Jul 5, 06:00 UTCJul 5, 06:20 UTC20m
2026-07-04 SAMU26 - Jul 4, 16:25 UTCJul 4, 17:05 UTC40m
2026-07-04 SAMU26 - Jul 4, 15:25 UTCJul 4, 15:35 UTC10m
2026-07-04 SAMU26 - Jul 4, 14:30 UTCJul 4, 14:35 UTC5m
2026-07-04 SAMU26 - Jul 4, 11:35 UTCJul 4, 11:45 UTC10m
2026-07-04 SAMU26 - Jul 4, 10:30 UTCJul 4, 10:45 UTC15m
2026-07-04 SAMU26 - Jul 4, 09:45 UTCJul 4, 09:50 UTC5m
2026-07-04 SAMU26 - Jul 4, 08:35 UTCJul 4, 09:05 UTC30m
2026-07-04 SAMU26 - Jul 4, 05:30 UTCJul 4, 05:50 UTC20m
2026-07-04 SAMU26 - Jul 4, 04:50 UTCJul 4, 04:55 UTC5m
2026-07-04 SAMU26 - Jul 4, 04:05 UTCJul 4, 04:45 UTC40m
2026-07-04 SAMU26 - Jul 4, 02:50 UTCJul 4, 03:00 UTC10m
2026-07-03 SAMU26 - Jul 3, 14:25 UTCJul 3, 16:00 UTC1h 35m
2026-07-03 SAMU26 - Jul 3, 00:40 UTCJul 3, 01:30 UTC50m
2026-07-02 SAMU26 - Jul 2, 23:50 UTCJul 3, 00:05 UTC15m
2026-07-02 SAMU26 - Jul 2, 23:05 UTCJul 2, 23:15 UTC10m
2026-07-02 SAMU26 - Jul 2, 20:50 UTCJul 2, 21:15 UTC25m
2026-07-02 SAMU26 - Jul 2, 19:20 UTCJul 2, 19:30 UTC10m
2026-07-02 SAMU26 - Jul 2, 18:05 UTCJul 2, 18:20 UTC15m
2026-07-02 SAMU26 - Jul 2, 12:30 UTCJul 2, 12:50 UTC20m
2026-07-02 SAMU26 - Jul 2, 11:25 UTCJul 2, 11:50 UTC25m
2026-07-02 SAMU26 - Jul 2, 04:30 UTCJul 2, 05:10 UTC40m
2026-07-02 SAMU26 - Jul 2, 00:30 UTCJul 2, 00:40 UTC10m
2026-07-01 SAMU26 - Jul 1, 23:30 UTCJul 1, 23:40 UTC10m
2026-07-01 SAMU26 - Jul 1, 21:00 UTCJul 1, 21:10 UTC10m
2026-07-01 SAMU26 - Jul 1, 20:10 UTCJul 1, 20:20 UTC10m
2026-07-01 SAMU26 - Jul 1, 15:10 UTCJul 1, 15:50 UTC40m
2026-07-01 SAMU26 - Jul 1, 14:20 UTCJul 1, 14:30 UTC10m
2026-07-01 SAMU26 - Jul 1, 13:20 UTCJul 1, 13:30 UTC10m
2026-07-01 SAMU26 - Jul 1, 12:45 UTCJul 1, 13:05 UTC20m
2026-07-01 SAMU26 - Jul 1, 11:55 UTCJul 1, 12:20 UTC25m
2026-06-30 SAMU26 - Jun 30, 16:35 UTCJun 30, 16:45 UTC10m
2026-06-30 SAMU26 - Jun 30, 10:15 UTCJun 30, 10:25 UTC10m
2026-06-30 SAMU26 - Jun 30, 09:10 UTCJun 30, 09:20 UTC10m
2026-06-29 SAMU26 - Jun 29, 22:49 UTCJun 29, 23:05 UTC15m
2026-06-29 SAMU26 - Jun 29, 16:19 UTCJun 29, 16:59 UTC40m
2026-06-29 SAMU26 - Jun 29, 15:30 UTCJun 29, 15:39 UTC10m
2026-06-29 SAMU26 - Jun 29, 14:29 UTCJun 29, 14:39 UTC10m
2026-06-29 SAMU26 - Jun 29, 06:05 UTCJun 29, 06:40 UTC35m
2026-06-29 SAMU26 - Jun 29, 04:30 UTCJun 29, 05:24 UTC55m

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

Mode-S 39AC18 frequently asked

What is Mode-S code 39AC18?
39AC18 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HLAY.
Where is Mode-S 39AC18 registered?
Mode-S code 39AC18 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 39AC18 broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 39AC18, octal 16326030, decimal 3,779,608.
What flights does 39AC18 operate?
Mode-S 39AC18 has broadcast 2 distinct callsigns, including SAMU26, FHLAY.