Apparatus

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sensors Mode-S transponder

3990C1

ICAO 24-bit transponder address · allocated to France

Hex
3990C1
Octal
16310301
Decimal
3,772,609
Country
FR
No current signal · last broadcast 12d ago
Flights observed
74
Distinct callsigns
1
Country
FR
Last broadcast
12d ago

Last known position

Most recent position reported by Mode-S 3990C1.

Country allocation

The ICAO 24-bit address 3990C1 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
FHEGB - 74 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-24 FHEGB - Jun 24, 09:19 UTCJun 24, 11:24 UTC2h 5m
2026-06-24 FHEGB - Jun 24, 05:34 UTCJun 24, 07:44 UTC2h 10m
2026-06-24 FHEGB - Jun 24, 04:20 UTCJun 24, 04:34 UTC15m
2026-06-23 FHEGB - Jun 23, 13:19 UTCJun 23, 14:04 UTC45m
2026-06-23 FHEGB - Jun 23, 11:10 UTCJun 23, 11:19 UTC10m
2026-06-23 FHEGB - Jun 23, 08:00 UTCJun 23, 10:10 UTC2h 10m
2026-06-23 FHEGB - Jun 23, 04:50 UTCJun 23, 07:19 UTC2h 30m
2026-06-22 FHEGB - Jun 22, 14:40 UTCJun 22, 16:40 UTC2h 0m
2026-06-22 FHEGB - Jun 22, 08:04 UTCJun 22, 10:55 UTC2h 50m
2026-06-22 FHEGB - Jun 22, 06:05 UTCJun 22, 07:19 UTC1h 15m
2026-06-22 FHEGB - Jun 22, 04:19 UTCJun 22, 05:24 UTC1h 5m
2026-06-20 FHEGB - Jun 20, 09:05 UTCJun 20, 10:39 UTC1h 35m
2026-06-20 FHEGB - Jun 20, 07:24 UTCJun 20, 07:39 UTC15m
2026-06-19 FHEGB - Jun 19, 11:14 UTCJun 19, 12:34 UTC1h 20m
2026-06-19 FHEGB - Jun 19, 07:25 UTCJun 19, 10:19 UTC2h 55m
2026-06-19 FHEGB - Jun 19, 05:00 UTCJun 19, 06:10 UTC1h 10m
2026-06-18 FHEGB - Jun 18, 10:05 UTCJun 18, 10:15 UTC10m
2026-06-18 FHEGB - Jun 18, 08:40 UTCJun 18, 09:05 UTC25m
2026-06-18 FHEGB - Jun 18, 05:35 UTCJun 18, 07:30 UTC1h 55m
2026-06-17 FHEGB - Jun 17, 06:00 UTCJun 17, 06:20 UTC20m
2026-06-16 FHEGB - Jun 16, 15:24 UTCJun 16, 17:15 UTC1h 50m
2026-06-16 FHEGB - Jun 16, 09:30 UTCJun 16, 11:49 UTC2h 20m
2026-06-16 FHEGB - Jun 16, 05:50 UTCJun 16, 08:35 UTC2h 45m
2026-06-15 FHEGB - Jun 15, 15:10 UTCJun 15, 16:35 UTC1h 25m
2026-06-15 FHEGB - Jun 15, 14:05 UTCJun 15, 14:30 UTC25m
2026-06-15 FHEGB - Jun 15, 09:40 UTCJun 15, 13:10 UTC3h 30m
2026-06-13 FHEGB - Jun 13, 07:20 UTCJun 13, 08:40 UTC1h 20m
2026-06-11 FHEGB - Jun 11, 15:25 UTCJun 11, 16:20 UTC55m
2026-06-11 FHEGB - Jun 11, 12:05 UTCJun 11, 12:45 UTC40m
2026-06-11 FHEGB - Jun 11, 10:20 UTCJun 11, 11:10 UTC50m
2026-06-11 FHEGB - Jun 11, 08:40 UTCJun 11, 09:30 UTC50m
2026-06-10 FHEGB - Jun 10, 13:55 UTCJun 10, 14:10 UTC15m
2026-06-10 FHEGB - Jun 10, 10:10 UTCJun 10, 11:55 UTC1h 45m
2026-06-09 FHEGB - Jun 9, 16:45 UTCJun 9, 17:20 UTC35m
2026-06-09 FHEGB - Jun 9, 14:50 UTCJun 9, 15:50 UTC1h 0m
2026-06-09 FHEGB - Jun 9, 08:50 UTCJun 9, 10:30 UTC1h 40m
2026-06-09 FHEGB - Jun 9, 05:55 UTCJun 9, 08:10 UTC2h 15m
2026-06-08 FHEGB - Jun 8, 10:30 UTCJun 8, 13:05 UTC2h 35m
2026-06-08 FHEGB - Jun 8, 06:35 UTCJun 8, 08:20 UTC1h 45m
2026-06-06 FHEGB - Jun 6, 09:45 UTCJun 6, 11:30 UTC1h 45m
2026-06-05 FHEGB - Jun 5, 07:00 UTCJun 5, 07:10 UTC10m
2026-06-04 FHEGB - Jun 4, 12:45 UTCJun 4, 13:20 UTC35m
2026-06-03 FHEGB - Jun 3, 15:15 UTCJun 3, 16:45 UTC1h 30m
2026-06-03 FHEGB - Jun 3, 12:15 UTCJun 3, 14:20 UTC2h 5m
2026-06-02 FHEGB - Jun 2, 06:05 UTCJun 2, 07:45 UTC1h 40m
2026-06-01 FHEGB - Jun 1, 16:30 UTCJun 1, 16:55 UTC25m
2026-06-01 FHEGB - Jun 1, 13:05 UTCJun 1, 15:45 UTC2h 40m
2026-06-01 FHEGB - Jun 1, 11:25 UTCJun 1, 11:35 UTC10m
2026-06-01 FHEGB - Jun 1, 09:50 UTCJun 1, 10:35 UTC45m
2026-06-01 FHEGB - Jun 1, 05:50 UTCJun 1, 09:10 UTC3h 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.

Mode-S 3990C1 frequently asked

What is Mode-S code 3990C1?
3990C1 is an ICAO 24-bit transponder address. Allocated to France.
Where is Mode-S 3990C1 registered?
Mode-S code 3990C1 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3990C1 broadcasting right now?
No active broadcast right now. Last signal was 12d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3990C1, octal 16310301, decimal 3,772,609.
What flights does 3990C1 operate?
Mode-S 3990C1 has broadcast 1 distinct callsign, including FHEGB.