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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 Jul 25, 16:40 UTC
Flights observed
137
Distinct callsigns
1
Country
FR
Last broadcast
Jul 25, 16:40 UTC

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 - 137 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 FHECC - Jul 25, 15:35 UTCJul 25, 16:35 UTC1h 0m
2026-07-25 FHECC - Jul 25, 11:45 UTCJul 25, 12:25 UTC40m
2026-07-24 FHECC - Jul 24, 14:50 UTCJul 24, 15:55 UTC1h 5m
2026-07-24 FHECC - Jul 24, 12:25 UTCJul 24, 13:00 UTC35m
2026-07-23 FHECC RNS → RNS Jul 23, 17:50 UTCJul 23, 18:30 UTC40m
2026-07-23 FHECC RNS → RNS Jul 23, 13:50 UTCJul 23, 14:15 UTC25m
2026-07-22 FHECC - Jul 22, 13:55 UTCJul 22, 14:35 UTC40m
2026-07-22 FHECC RNS → RNS Jul 22, 13:00 UTCJul 22, 13:15 UTC15m
2026-07-22 FHECC RNS → RNS Jul 22, 11:35 UTCJul 22, 11:40 UTC5m
2026-07-21 FHECC RNS → RNS Jul 21, 08:50 UTCJul 21, 09:35 UTC45m
2026-07-21 FHECC RNS → RNS Jul 21, 07:10 UTCJul 21, 07:15 UTC5m
2026-07-21 FHECC RNS → RNS Jul 21, 06:25 UTCJul 21, 07:05 UTC40m
2026-07-20 FHECC LBY → RNS Jul 20, 15:35 UTCJul 20, 16:20 UTC45m
2026-07-20 FHECC RNS → LBY Jul 20, 12:05 UTCJul 20, 12:45 UTC40m
2026-07-19 FHECC RNS → RNS Jul 19, 14:25 UTCJul 19, 15:20 UTC55m
2026-07-19 FHECC RNS → RNS Jul 19, 08:20 UTCJul 19, 09:15 UTC55m
2026-07-18 FHECC - Jul 18, 16:35 UTCJul 18, 17:00 UTC25m
2026-07-18 FHECC - Jul 18, 15:15 UTCJul 18, 15:40 UTC25m
2026-07-18 FHECC - Jul 18, 14:20 UTCJul 18, 14:40 UTC20m
2026-07-18 FHECC - Jul 18, 13:00 UTCJul 18, 13:20 UTC20m
2026-07-18 FHECC RNS → RNS Jul 18, 09:25 UTCJul 18, 09:55 UTC30m
2026-07-17 FHECC RNS → RNS Jul 17, 09:30 UTCJul 17, 09:55 UTC25m
2026-07-10 FHECC RNS → RNS Jul 10, 08:00 UTCJul 10, 08:15 UTC15m
2026-07-09 FHECC RNS → RNS Jul 9, 08:30 UTCJul 9, 08:55 UTC25m
2026-07-08 FHECC RNS → RNS Jul 8, 11:20 UTCJul 8, 11:55 UTC35m
2026-07-08 FHECC RNS → RNS Jul 8, 08:05 UTCJul 8, 08:55 UTC50m
2026-07-07 FHECC RNS → RNS Jul 7, 19:45 UTCJul 7, 20:30 UTC45m
2026-07-07 FHECC RNS → RNS Jul 7, 05:45 UTCJul 7, 06:05 UTC20m
2026-07-06 FHECC RNS → RNS Jul 6, 08:25 UTCJul 6, 08:45 UTC20m
2026-07-05 FHECC RNS → RNS Jul 5, 15:20 UTCJul 5, 16:15 UTC55m
2026-07-05 FHECC - Jul 5, 12:50 UTCJul 5, 13:35 UTC45m
2026-07-05 FHECC - Jul 5, 09:10 UTCJul 5, 09:50 UTC40m
2026-07-04 FHECC RNS → RNS Jul 4, 17:50 UTCJul 4, 18:15 UTC25m
2026-07-04 FHECC RNS → RNS Jul 4, 16:10 UTCJul 4, 16:15 UTC5m
2026-07-04 FHECC RNS → RNS Jul 4, 14:20 UTCJul 4, 15:05 UTC45m
2026-07-04 FHECC RNS → RNS Jul 4, 12:05 UTCJul 4, 13:00 UTC55m
2026-07-04 FHECC RNS → RNS Jul 4, 09:15 UTCJul 4, 10:10 UTC55m
2026-07-03 FHECC RNS → RNS Jul 3, 18:10 UTCJul 3, 19:15 UTC1h 5m
2026-07-03 FHECC RNS → RNS Jul 3, 13:30 UTCJul 3, 15:20 UTC1h 50m
2026-07-03 FHECC RNS → RNS Jul 3, 09:40 UTCJul 3, 09:55 UTC15m
2026-07-03 FHECC RNS → RNS Jul 3, 08:10 UTCJul 3, 08:55 UTC45m
2026-07-02 FHECC RNS → RNS Jul 2, 09:10 UTCJul 2, 09:25 UTC15m
2026-07-01 FHECC RNS → RNS Jul 1, 11:25 UTCJul 1, 11:40 UTC15m
2026-06-30 FHECC RNS → RNS Jun 30, 09:30 UTCJun 30, 10:10 UTC40m
2026-06-29 FHECC RNS → RNS Jun 29, 19:44 UTCJun 29, 20:40 UTC55m
2026-06-28 FHECC RNS → RNS Jun 28, 15:29 UTCJun 28, 16:14 UTC45m
2026-06-28 FHECC RNS → RNS Jun 28, 08:09 UTCJun 28, 08:50 UTC40m
2026-06-27 FHECC RNS → RNS Jun 27, 17:44 UTCJun 27, 18:45 UTC1h 0m
2026-06-27 FHECC RNS → RNS Jun 27, 16:14 UTCJun 27, 16:55 UTC40m
2026-06-20 FHECC - Jun 20, 10:15 UTCJun 20, 10:49 UTC35m

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 Jul 25, 16:40 UTC.
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.