Apparatus

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sensors Mode-S transponder

39B171

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-HMLR · BRM AERO Bristell B23

Hex
39B171
Octal
16330561
Decimal
3,780,977
Country
FR
Tail
F-HMLR
Type
BR23
Broadcasting now · callsign FHMLR · 25 ft
Flights observed
90
Distinct callsigns
1
Country
FR
Last broadcast
31m ago

Current position

39B171 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 39B171 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
FHMLR - 90 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 FHMLR RNS → RNS May 30, 08:20 UTCMay 30, 09:30 UTC1h 10m
2026-05-29 FHMLR RNS → RNS May 29, 11:05 UTCMay 29, 11:45 UTC40m
2026-05-28 FHMLR RNS → RNS May 28, 09:05 UTCMay 28, 09:45 UTC40m
2026-05-24 FHMLR RNS → RNS May 24, 08:15 UTCMay 24, 08:30 UTC15m
2026-05-22 FHMLR RNS → RNS May 22, 12:35 UTCMay 22, 13:25 UTC50m
2026-05-22 FHMLR RNS → RNS May 22, 09:55 UTCMay 22, 10:30 UTC35m
2026-05-18 FHMLR RNS → RNS May 18, 08:30 UTCMay 18, 08:55 UTC25m
2026-05-17 FHMLR - May 17, 16:01 UTCMay 17, 16:30 UTC30m
2026-05-17 FHMLR RNS → RNS May 17, 14:35 UTCMay 17, 15:25 UTC50m
2026-05-17 FHMLR RNS → RNS May 17, 09:50 UTCMay 17, 10:20 UTC30m
2026-05-16 FHMLR RNS → RNS May 16, 14:55 UTCMay 16, 15:40 UTC45m
2026-05-16 FHMLR RNS → RNS May 16, 12:45 UTCMay 16, 13:41 UTC55m
2026-05-15 FHMLR RNS → RNS May 15, 13:05 UTCMay 15, 14:05 UTC1h 0m
2026-05-15 FHMLR RNS → RNS May 15, 09:35 UTCMay 15, 10:00 UTC25m
2026-05-15 FHMLR RNS → RNS May 15, 08:05 UTCMay 15, 08:30 UTC25m
2026-05-11 FHMLR RNS → RNS May 11, 09:50 UTCMay 11, 10:25 UTC35m
2026-05-09 FHMLR RNS → RNS May 9, 14:10 UTCMay 9, 14:50 UTC40m
2026-05-08 FHMLR RNS → RNS May 8, 15:05 UTCMay 8, 15:45 UTC40m
2026-05-07 FHMLR RNS → RNS May 7, 12:25 UTCMay 7, 13:15 UTC50m
2026-05-07 FHMLR RNS → RNS May 7, 09:40 UTCMay 7, 10:30 UTC50m
2026-05-07 FHMLR RNS → RNS May 7, 08:00 UTCMay 7, 08:45 UTC45m
2026-05-06 FHMLR RNS → RNS May 6, 15:20 UTCMay 6, 15:50 UTC30m
2026-05-06 FHMLR RNS → RNS May 6, 13:15 UTCMay 6, 13:30 UTC15m
2026-05-06 FHMLR RNS → RNS May 6, 10:55 UTCMay 6, 11:20 UTC25m
2026-05-06 FHMLR - May 6, 09:20 UTCMay 6, 09:50 UTC30m
2026-05-06 FHMLR - May 6, 08:10 UTCMay 6, 08:45 UTC35m
2026-05-03 FHMLR RNS → RNS May 3, 15:35 UTCMay 3, 16:15 UTC40m
2026-05-03 FHMLR RNS → RNS May 3, 14:00 UTCMay 3, 14:35 UTC35m
2026-05-03 FHMLR RNS → RNS May 3, 12:25 UTCMay 3, 13:00 UTC35m
2026-05-02 FHMLR RNS → RNS May 2, 13:35 UTCMay 2, 14:00 UTC25m
2026-05-01 FHMLR RNS → RNS May 1, 13:35 UTCMay 1, 13:50 UTC15m
2026-05-01 FHMLR RNS → RNS May 1, 12:45 UTCMay 1, 13:05 UTC20m
2026-05-01 FHMLR RNS → RNS May 1, 11:35 UTCMay 1, 11:55 UTC20m
2026-05-01 FHMLR RNS → RNS May 1, 10:05 UTCMay 1, 10:40 UTC35m
2026-05-01 FHMLR RNS → RNS May 1, 08:25 UTCMay 1, 08:55 UTC30m
2026-04-29 FHMLR RNS → RNS Apr 29, 08:50 UTCApr 29, 09:45 UTC56m
2026-04-28 FHMLR RNS → RNS Apr 28, 15:55 UTCApr 28, 16:20 UTC25m
2026-04-28 FHMLR RNS → RNS Apr 28, 13:50 UTCApr 28, 14:10 UTC20m
2026-04-28 FHMLR RNS → RNS Apr 28, 12:25 UTCApr 28, 12:40 UTC15m
2026-04-28 FHMLR RNS → RNS Apr 28, 10:30 UTCApr 28, 11:00 UTC30m
2026-04-27 FHMLR RNS → RNS Apr 27, 17:50 UTCApr 27, 18:10 UTC20m
2026-04-27 FHMLR - Apr 27, 16:00 UTCApr 27, 16:25 UTC25m
2026-04-27 FHMLR RNS → RNS Apr 27, 15:35 UTCApr 27, 15:45 UTC10m
2026-04-27 FHMLR RNS → RNS Apr 27, 12:20 UTCApr 27, 13:30 UTC1h 10m
2026-04-27 FHMLR RNS → RNS Apr 27, 10:10 UTCApr 27, 10:25 UTC15m
2026-04-27 FHMLR RNS → RNS Apr 27, 09:30 UTCApr 27, 10:00 UTC30m
2026-04-26 FHMLR RNS → RNS Apr 26, 16:05 UTCApr 26, 16:20 UTC15m
2026-04-26 FHMLR RNS → RNS Apr 26, 15:45 UTCApr 26, 16:00 UTC15m
2026-04-26 FHMLR RNS → RNS Apr 26, 14:35 UTCApr 26, 15:00 UTC25m
2026-04-26 FHMLR RNS → RNS Apr 26, 12:25 UTCApr 26, 13:10 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-HMLR page for operator, model, and routing details .

Mode-S 39B171 frequently asked

What is Mode-S code 39B171?
39B171 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HMLR.
Where is Mode-S 39B171 registered?
Mode-S code 39B171 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 39B171 broadcasting right now?
Yes. Mode-S 39B171 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 39B171, octal 16330561, decimal 3,780,977.
What flights does 39B171 operate?
Mode-S 39B171 has broadcast 1 distinct callsign, including FHMLR.