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
No current signal · last broadcast Jul 25, 10:50 UTC
Flights observed
195
Distinct callsigns
1
Country
FR
Last broadcast
Jul 25, 10:50 UTC

Last known position

Most recent position reported by Mode-S 39B171.

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 - 195 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 FHMLR RNS → RNS Jul 25, 10:05 UTCJul 25, 10:45 UTC40m
2026-07-25 FHMLR RNS → RNS Jul 25, 08:40 UTCJul 25, 09:20 UTC40m
2026-07-24 FHMLR RNS → RNS Jul 24, 16:45 UTCJul 24, 17:10 UTC25m
2026-07-24 FHMLR RNS → RNS Jul 24, 12:35 UTCJul 24, 13:10 UTC35m
2026-07-24 FHMLR RNS → RNS Jul 24, 07:35 UTCJul 24, 09:10 UTC1h 35m
2026-07-23 FHMLR RNS → RNS Jul 23, 16:15 UTCJul 23, 16:35 UTC20m
2026-07-23 FHMLR RNS → RNS Jul 23, 12:55 UTCJul 23, 13:20 UTC25m
2026-07-23 FHMLR RNS → RNS Jul 23, 10:40 UTCJul 23, 11:30 UTC50m
2026-07-23 FHMLR RNS → RNS Jul 23, 08:40 UTCJul 23, 09:15 UTC35m
2026-07-23 FHMLR RNS → RNS Jul 23, 07:05 UTCJul 23, 07:25 UTC20m
2026-07-23 FHMLR RNS → RNS Jul 23, 06:30 UTCJul 23, 06:55 UTC25m
2026-07-22 FHMLR RNS → RNS Jul 22, 17:35 UTCJul 22, 18:25 UTC50m
2026-07-22 FHMLR RNS → RNS Jul 22, 13:30 UTCJul 22, 13:45 UTC15m
2026-07-19 FHMLR RNS → RNS Jul 19, 09:30 UTCJul 19, 10:05 UTC35m
2026-07-18 FHMLR RNS → RNS Jul 18, 08:10 UTCJul 18, 09:25 UTC1h 15m
2026-07-18 FHMLR RNS → RNS Jul 18, 05:50 UTCJul 18, 06:05 UTC15m
2026-07-17 FHMLR RNS → RNS Jul 17, 17:20 UTCJul 17, 17:44 UTC25m
2026-07-17 FHMLR RNS → RNS Jul 17, 14:20 UTCJul 17, 15:15 UTC55m
2026-07-17 FHMLR - Jul 17, 13:05 UTCJul 17, 13:40 UTC35m
2026-07-17 FHMLR RNS → LBY Jul 17, 11:10 UTCJul 17, 11:45 UTC35m
2026-07-17 FHMLR RNS → RNS Jul 17, 09:04 UTCJul 17, 09:40 UTC35m
2026-07-17 FHMLR RNS → RNS Jul 17, 07:20 UTCJul 17, 07:55 UTC35m
2026-07-16 FHMLR - Jul 16, 09:30 UTCJul 16, 10:15 UTC45m
2026-07-16 FHMLR RNS → RNS Jul 16, 08:05 UTCJul 16, 08:50 UTC45m
2026-07-15 FHMLR RNS → RNS Jul 15, 08:25 UTCJul 15, 08:45 UTC20m
2026-07-14 FHMLR - Jul 14, 17:10 UTCJul 14, 18:15 UTC1h 5m
2026-07-14 FHMLR - Jul 14, 14:05 UTCJul 14, 14:25 UTC20m
2026-07-14 FHMLR RNS → LBY Jul 14, 11:10 UTCJul 14, 11:50 UTC40m
2026-07-14 FHMLR RNS → RNS Jul 14, 08:40 UTCJul 14, 09:05 UTC25m
2026-07-10 FHMLR RNS → RNS Jul 10, 08:35 UTCJul 10, 08:50 UTC15m
2026-07-10 FHMLR RNS → RNS Jul 10, 06:25 UTCJul 10, 07:00 UTC35m
2026-07-09 FHMLR RNS → RNS Jul 9, 08:10 UTCJul 9, 08:45 UTC35m
2026-07-09 FHMLR RNS → RNS Jul 9, 06:00 UTCJul 9, 06:35 UTC35m
2026-07-08 FHMLR RNS → RNS Jul 8, 08:30 UTCJul 8, 09:20 UTC50m
2026-07-06 FHMLR RNS → RNS Jul 6, 11:55 UTCJul 6, 12:00 UTC5m
2026-07-06 FHMLR RNS → RNS Jul 6, 09:10 UTCJul 6, 09:55 UTC45m
2026-07-05 FHMLR RNS → RNS Jul 5, 15:10 UTCJul 5, 16:50 UTC1h 40m
2026-07-05 FHMLR RNS → RNS Jul 5, 13:05 UTCJul 5, 13:30 UTC25m
2026-07-05 FHMLR RNS → RNS Jul 5, 10:20 UTCJul 5, 10:50 UTC30m
2026-07-05 FHMLR RNS → RNS Jul 5, 08:50 UTCJul 5, 09:15 UTC25m
2026-07-04 FHMLR RNS → RNS Jul 4, 14:00 UTCJul 4, 14:35 UTC35m
2026-07-04 FHMLR RNS → RNS Jul 4, 12:35 UTCJul 4, 13:10 UTC35m
2026-07-04 FHMLR RNS → RNS Jul 4, 10:35 UTCJul 4, 11:05 UTC30m
2026-07-04 FHMLR RNS → RNS Jul 4, 08:25 UTCJul 4, 09:50 UTC1h 25m
2026-07-03 FHMLR RNS → RNS Jul 3, 15:55 UTCJul 3, 16:35 UTC40m
2026-07-03 FHMLR RNS → RNS Jul 3, 14:35 UTCJul 3, 15:00 UTC25m
2026-07-03 FHMLR - Jul 3, 13:00 UTCJul 3, 13:40 UTC40m
2026-07-03 FHMLR RNS → RNS Jul 3, 11:55 UTCJul 3, 12:20 UTC25m
2026-07-03 FHMLR RNS → RNS Jul 3, 10:45 UTCJul 3, 11:05 UTC20m
2026-07-03 FHMLR RNS → RNS Jul 3, 09:00 UTCJul 3, 09:35 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-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?
No active broadcast right now. Last signal was Jul 25, 10:50 UTC.
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.