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sensors Mode-S transponder

3949C4

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-GSOE · AEROSPATIALE AS-350 Ecureuil

Hex
3949C4
Octal
16244704
Decimal
3,754,436
Country
FR
Tail
F-GSOE
Type
AS50
No current signal · last broadcast 10h ago
Flights observed
84
Distinct callsigns
1
Country
FR
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 3949C4.

Country allocation

The ICAO 24-bit address 3949C4 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
FGSOE - 84 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 FGSOE - Jul 20, 07:15 UTCJul 20, 07:40 UTC25m
2026-07-17 FGSOE - Jul 17, 12:15 UTCJul 17, 12:25 UTC10m
2026-07-17 FGSOE - Jul 17, 08:54 UTCJul 17, 09:10 UTC15m
2026-07-16 FGSOE - Jul 16, 08:20 UTCJul 16, 08:30 UTC10m
2026-07-15 FGSOE - Jul 15, 12:50 UTCJul 15, 13:00 UTC10m
2026-07-15 FGSOE - Jul 15, 06:30 UTCJul 15, 06:45 UTC15m
2026-07-13 FGSOE - Jul 13, 05:45 UTCJul 13, 05:55 UTC10m
2026-07-10 FGSOE - Jul 10, 05:50 UTCJul 10, 06:00 UTC10m
2026-07-09 FGSOE - Jul 9, 14:05 UTCJul 9, 14:45 UTC40m
2026-07-09 FGSOE - Jul 9, 03:35 UTCJul 9, 04:15 UTC40m
2026-07-08 FGSOE - Jul 8, 11:30 UTCJul 8, 12:10 UTC40m
2026-07-06 FGSOE - Jul 6, 08:40 UTCJul 6, 08:55 UTC15m
2026-07-06 FGSOE - Jul 6, 06:50 UTCJul 6, 08:00 UTC1h 10m
2026-07-05 FGSOE - Jul 5, 13:40 UTCJul 5, 14:25 UTC45m
2026-07-05 FGSOE - Jul 5, 07:50 UTCJul 5, 08:30 UTC40m
2026-07-05 FGSOE - Jul 5, 06:45 UTCJul 5, 07:05 UTC20m
2026-07-04 FGSOE - Jul 4, 18:10 UTCJul 4, 18:25 UTC15m
2026-07-04 FGSOE - Jul 4, 13:15 UTCJul 4, 14:10 UTC55m
2026-07-03 FGSOE - Jul 3, 14:35 UTCJul 3, 15:05 UTC30m
2026-07-03 FGSOE - Jul 3, 09:25 UTCJul 3, 11:15 UTC1h 50m
2026-07-02 FGSOE - Jul 2, 11:00 UTCJul 2, 11:10 UTC10m
2026-07-01 FGSOE - Jul 1, 16:35 UTCJul 1, 17:10 UTC35m
2026-06-30 FGSOE - Jun 30, 14:15 UTCJun 30, 14:55 UTC40m
2026-06-30 FGSOE - Jun 30, 08:20 UTCJun 30, 08:55 UTC35m
2026-06-30 FGSOE - Jun 30, 07:00 UTCJun 30, 07:10 UTC10m
2026-06-25 FGSOE - Jun 25, 12:35 UTCJun 25, 13:14 UTC40m
2026-06-25 FGSOE - Jun 25, 06:35 UTCJun 25, 07:00 UTC25m
2026-06-25 FGSOE - Jun 25, 05:44 UTCJun 25, 05:55 UTC10m
2026-06-24 FGSOE - Jun 24, 07:44 UTCJun 24, 08:14 UTC30m
2026-06-24 FGSOE - Jun 24, 06:25 UTCJun 24, 06:50 UTC25m
2026-06-23 FGSOE - Jun 23, 07:09 UTCJun 23, 07:19 UTC10m
2026-06-20 FGSOE - Jun 20, 06:54 UTCJun 20, 07:14 UTC20m
2026-06-20 FGSOE - Jun 20, 04:49 UTCJun 20, 05:24 UTC35m
2026-06-16 FGSOE - Jun 16, 06:35 UTCJun 16, 06:45 UTC10m
2026-06-12 FGSOE - Jun 12, 08:10 UTCJun 12, 08:25 UTC15m
2026-06-11 FGSOE - Jun 11, 15:15 UTCJun 11, 15:45 UTC30m
2026-06-11 FGSOE - Jun 11, 03:40 UTCJun 11, 04:15 UTC35m
2026-06-10 FGSOE - Jun 10, 14:00 UTCJun 10, 14:55 UTC55m
2026-06-10 FGSOE - Jun 10, 10:25 UTCJun 10, 10:35 UTC10m
2026-06-10 FGSOE - Jun 10, 06:30 UTCJun 10, 06:40 UTC10m
2026-06-09 FGSOE - Jun 9, 08:10 UTCJun 9, 08:15 UTC5m
2026-06-09 FGSOE - Jun 9, 05:50 UTCJun 9, 06:40 UTC50m
2026-06-08 FGSOE - Jun 8, 06:40 UTCJun 8, 06:50 UTC10m
2026-06-08 FGSOE - Jun 8, 05:20 UTCJun 8, 05:30 UTC10m
2026-06-05 FGSOE - Jun 5, 06:15 UTCJun 5, 07:50 UTC1h 35m
2026-06-04 FGSOE - Jun 4, 11:55 UTCJun 4, 12:05 UTC10m
2026-06-04 FGSOE - Jun 4, 03:50 UTCJun 4, 04:00 UTC10m
2026-06-02 FGSOE - Jun 2, 12:25 UTCJun 2, 12:45 UTC20m
2026-05-28 FGSOE - May 28, 09:00 UTCMay 28, 10:55 UTC1h 55m
2026-05-28 FGSOE - May 28, 08:05 UTCMay 28, 08:55 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 F-GSOE page for operator, model, and routing details .

Mode-S 3949C4 frequently asked

What is Mode-S code 3949C4?
3949C4 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-GSOE.
Where is Mode-S 3949C4 registered?
Mode-S code 3949C4 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3949C4 broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3949C4, octal 16244704, decimal 3,754,436.
What flights does 3949C4 operate?
Mode-S 3949C4 has broadcast 1 distinct callsign, including FGSOE.