Apparatus

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sensors Mode-S transponder

399042

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-HECC · CESSNA 172 Skyhawk

Hex
399042
Octal
16310102
Decimal
3,772,482
Country
FR
Tail
F-HECC
Type
C172
No current signal · last broadcast 20h ago
Flights observed
65
Distinct callsigns
1
Country
FR
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S 399042.

Country allocation

The ICAO 24-bit address 399042 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
FHECC - 65 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 FHECC DNR → RNS May 29, 08:30 UTCMay 29, 09:05 UTC35m
2026-05-29 FHECC - May 29, 07:15 UTCMay 29, 07:45 UTC30m
2026-05-27 FHECC - May 27, 12:05 UTCMay 27, 12:50 UTC45m
2026-05-27 FHECC - May 27, 08:05 UTCMay 27, 09:20 UTC1h 15m
2026-05-26 FHECC RNS → RNS May 26, 16:40 UTCMay 26, 16:59 UTC20m
2026-05-26 FHECC RNS → RNS May 26, 15:39 UTCMay 26, 16:05 UTC25m
2026-05-25 FHECC RNS → RNS May 25, 09:15 UTCMay 25, 09:30 UTC15m
2026-05-24 FHECC - May 24, 16:20 UTCMay 24, 18:20 UTC2h 0m
2026-05-23 FHECC - May 23, 09:50 UTCMay 23, 10:35 UTC45m
2026-05-23 FHECC RNS → LME May 23, 08:10 UTCMay 23, 09:00 UTC50m
2026-05-22 FHECC RNS → RNS May 22, 14:45 UTCMay 22, 15:35 UTC50m
2026-05-22 FHECC RNS → RNS May 22, 12:55 UTCMay 22, 13:45 UTC50m
2026-05-22 FHECC RNS → RNS May 22, 09:30 UTCMay 22, 09:45 UTC15m
2026-05-21 FHECC RNS → RNS May 21, 16:40 UTCMay 21, 17:15 UTC35m
2026-05-21 FHECC - May 21, 12:45 UTCMay 21, 13:30 UTC45m
2026-05-21 FHECC - May 21, 09:50 UTCMay 21, 10:15 UTC25m
2026-05-17 FHECC RNS → RNS May 17, 13:20 UTCMay 17, 14:01 UTC40m
2026-05-16 FHECC RNS → RNS May 16, 08:41 UTCMay 16, 09:45 UTC1h 5m
2026-05-15 FHECC RNS → RNS May 15, 15:00 UTCMay 15, 15:45 UTC45m
2026-05-15 FHECC RNS → RNS May 15, 09:35 UTCMay 15, 09:55 UTC20m
2026-05-13 FHECC RNS → RNS May 13, 14:51 UTCMay 13, 15:15 UTC25m
2026-05-13 FHECC RNS → RNS May 13, 10:55 UTCMay 13, 11:15 UTC20m
2026-05-12 FHECC RNS → RNS May 12, 13:05 UTCMay 12, 14:40 UTC1h 35m
2026-05-12 FHECC RNS → RNS May 12, 09:10 UTCMay 12, 09:45 UTC35m
2026-05-11 FHECC RNS → RNS May 11, 12:45 UTCMay 11, 13:50 UTC1h 5m
2026-05-09 FHECC RNS → RNS May 9, 16:45 UTCMay 9, 17:15 UTC30m
2026-05-08 FHECC RNS → RNS May 8, 15:55 UTCMay 8, 16:05 UTC10m
2026-05-08 FHECC RNS → RNS May 8, 15:20 UTCMay 8, 15:30 UTC10m
2026-05-08 FHECC RNS → RNS May 8, 13:15 UTCMay 8, 14:10 UTC55m
2026-05-08 FHECC RNS → RNS May 8, 10:04 UTCMay 8, 10:29 UTC25m
2026-05-08 FHECC RNS → RNS May 8, 07:39 UTCMay 8, 07:59 UTC20m
2026-05-07 FHECC RNS → RNS May 7, 15:35 UTCMay 7, 15:45 UTC10m
2026-05-02 FHECC RNS → RNS May 2, 08:15 UTCMay 2, 08:40 UTC25m
2026-05-01 FHECC RNS → RNS May 1, 13:30 UTCMay 1, 14:00 UTC30m
2026-05-01 FHECC RNS → RNS May 1, 08:45 UTCMay 1, 09:35 UTC50m
2026-04-29 FHECC RNS → RNS Apr 29, 08:30 UTCApr 29, 09:10 UTC41m
2026-04-28 FHECC RNS → RNS Apr 28, 12:40 UTCApr 28, 12:50 UTC10m
2026-04-28 FHECC RNS → RNS Apr 28, 09:35 UTCApr 28, 10:30 UTC55m
2026-04-27 FHECC RNS → RNS Apr 27, 17:20 UTCApr 27, 17:50 UTC30m
2026-04-27 FHECC RNS → RNS Apr 27, 13:45 UTCApr 27, 14:35 UTC50m
2026-04-27 FHECC RNS → RNS Apr 27, 08:45 UTCApr 27, 09:45 UTC1h 0m
2026-04-26 FHECC - Apr 26, 16:35 UTCApr 26, 17:35 UTC1h 0m
2026-04-26 FHECC - Apr 26, 14:40 UTCApr 26, 16:00 UTC1h 20m
2026-04-26 FHECC - Apr 26, 09:00 UTCApr 26, 10:20 UTC1h 20m
2026-04-26 FHECC - Apr 26, 06:50 UTCApr 26, 08:20 UTC1h 30m
2026-04-25 FHECC RNS → RNS Apr 25, 09:35 UTCApr 25, 10:00 UTC25m
2026-04-24 FHECC RNS → RNS Apr 24, 21:50 UTCApr 24, 22:05 UTC15m
2026-04-24 FHECC - Apr 24, 21:15 UTCApr 24, 21:25 UTC10m
2026-04-24 FHECC RNS → RNS Apr 24, 21:05 UTCApr 24, 21:10 UTC5m
2026-04-24 FHECC RNS → RNS Apr 24, 15:45 UTCApr 24, 16:30 UTC45m

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

Mode-S 399042 frequently asked

What is Mode-S code 399042?
399042 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HECC.
Where is Mode-S 399042 registered?
Mode-S code 399042 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 399042 broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 399042, octal 16310102, decimal 3,772,482.
What flights does 399042 operate?
Mode-S 399042 has broadcast 1 distinct callsign, including FHECC.