Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

39B331

ICAO 24-bit transponder address · allocated to France

Hex
39B331
Octal
16331461
Decimal
3,781,425
Country
FR
No current signal · last broadcast 18h ago
Flights observed
107
Distinct callsigns
8
Country
FR
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S 39B331.

Country allocation

The ICAO 24-bit address 39B331 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 8 distinct

Callsign Airline Flights Last seen
FHMZR - 99 2026-07-17
MZY039B - 2 2026-06-15
MZY15C - 1 2026-07-15
MZY039A - 1 2026-06-15
MZY039 - 1 2026-06-24
MZY032 - 1 2026-06-16
MZY026 - 1 2026-07-02
MZY015B - 1 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 FHMZR FNI → FNI Jul 17, 10:30 UTCJul 17, 11:10 UTC40m
2026-07-17 FHMZR FNI → FNI Jul 17, 09:10 UTCJul 17, 09:55 UTC45m
2026-07-17 FHMZR - Jul 17, 07:20 UTCJul 17, 08:00 UTC40m
2026-07-17 FHMZR FNI → FNI Jul 17, 06:00 UTCJul 17, 06:35 UTC35m
2026-07-16 FHMZR - Jul 16, 11:34 UTCJul 16, 12:00 UTC25m
2026-07-15 FHMZR FNI → FNI Jul 15, 16:35 UTCJul 15, 17:20 UTC45m
2026-07-15 MZY15C - Jul 15, 14:15 UTCJul 15, 15:20 UTC1h 5m
2026-07-13 FHMZR - Jul 13, 09:00 UTCJul 13, 10:20 UTC1h 20m
2026-07-13 FHMZR - Jul 13, 06:01 UTCJul 13, 06:25 UTC25m
2026-07-11 FHMZR - Jul 11, 09:10 UTCJul 11, 09:35 UTC25m
2026-07-11 FHMZR - Jul 11, 08:01 UTCJul 11, 08:25 UTC25m
2026-07-11 FHMZR - Jul 11, 07:00 UTCJul 11, 07:20 UTC20m
2026-07-10 FHMZR - Jul 10, 15:45 UTCJul 10, 16:25 UTC40m
2026-07-10 MZY015B FNI → FNI Jul 10, 08:40 UTCJul 10, 11:00 UTC2h 20m
2026-07-10 FHMZR FNI → FNI Jul 10, 06:30 UTCJul 10, 07:20 UTC50m
2026-07-09 FHMZR - Jul 9, 18:40 UTCJul 9, 19:15 UTC35m
2026-07-09 FHMZR FNI → FNI Jul 9, 17:35 UTCJul 9, 18:05 UTC30m
2026-07-09 FHMZR - Jul 9, 16:30 UTCJul 9, 17:00 UTC30m
2026-07-09 FHMZR - Jul 9, 09:20 UTCJul 9, 09:50 UTC30m
2026-07-09 FHMZR - Jul 9, 08:10 UTCJul 9, 08:45 UTC35m
2026-07-09 FHMZR FNI → FNI Jul 9, 07:15 UTCJul 9, 07:35 UTC20m
2026-07-09 FHMZR - Jul 9, 05:55 UTCJul 9, 06:30 UTC35m
2026-07-08 FHMZR FNI → FNI Jul 8, 08:40 UTCJul 8, 09:15 UTC35m
2026-07-08 FHMZR FNI → FNI Jul 8, 07:30 UTCJul 8, 08:00 UTC30m
2026-07-08 FHMZR FNI → FNI Jul 8, 05:45 UTCJul 8, 06:20 UTC35m
2026-07-07 FHMZR - Jul 7, 19:10 UTCJul 7, 19:40 UTC30m
2026-07-07 FHMZR - Jul 7, 18:10 UTCJul 7, 18:40 UTC30m
2026-07-07 FHMZR - Jul 7, 17:05 UTCJul 7, 17:35 UTC30m
2026-07-07 FHMZR - Jul 7, 09:55 UTCJul 7, 10:30 UTC35m
2026-07-07 FHMZR - Jul 7, 08:40 UTCJul 7, 09:10 UTC30m
2026-07-07 FHMZR - Jul 7, 07:00 UTCJul 7, 07:35 UTC35m
2026-07-07 FHMZR - Jul 7, 05:55 UTCJul 7, 06:25 UTC30m
2026-07-06 FHMZR - Jul 6, 09:40 UTCJul 6, 10:05 UTC25m
2026-07-06 FHMZR - Jul 6, 08:35 UTCJul 6, 09:00 UTC25m
2026-07-06 FHMZR - Jul 6, 07:30 UTCJul 6, 08:00 UTC30m
2026-07-06 FHMZR FNI → FNI Jul 6, 05:55 UTCJul 6, 06:30 UTC35m
2026-07-03 FHMZR - Jul 3, 11:05 UTCJul 3, 13:10 UTC2h 5m
2026-07-02 MZY026 - Jul 2, 07:40 UTCJul 2, 08:00 UTC20m
2026-07-01 FHMZR - Jul 1, 15:15 UTCJul 1, 16:10 UTC55m
2026-06-24 MZY039 - Jun 24, 04:50 UTCJun 24, 07:44 UTC2h 55m
2026-06-19 FHMZR - Jun 19, 05:49 UTCJun 19, 07:49 UTC2h 0m
2026-06-18 FHMZR - Jun 18, 06:40 UTCJun 18, 07:45 UTC1h 5m
2026-06-18 FHMZR - Jun 18, 05:30 UTCJun 18, 06:05 UTC35m
2026-06-16 MZY032 - Jun 16, 11:10 UTCJun 16, 12:05 UTC55m
2026-06-15 MZY039B - Jun 15, 14:34 UTCJun 15, 15:10 UTC35m
2026-06-15 MZY039B - Jun 15, 13:34 UTCJun 15, 13:45 UTC10m
2026-06-15 MZY039A - Jun 15, 11:10 UTCJun 15, 12:45 UTC1h 35m
2026-06-15 FHMZR - Jun 15, 06:10 UTCJun 15, 06:35 UTC25m
2026-06-12 FHMZR - Jun 12, 07:00 UTCJun 12, 07:30 UTC30m
2026-06-11 FHMZR - Jun 11, 06:45 UTCJun 11, 08:20 UTC1h 35m

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 39B331 frequently asked

What is Mode-S code 39B331?
39B331 is an ICAO 24-bit transponder address. Allocated to France.
Where is Mode-S 39B331 registered?
Mode-S code 39B331 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 39B331 broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 39B331, octal 16331461, decimal 3,781,425.
What flights does 39B331 operate?
Mode-S 39B331 has broadcast 8 distinct callsigns, including FHMZR, MZY039B, MZY15C, MZY039A, MZY039.