Apparatus

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sensors Mode-S transponder

3B9B21

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-HTNS · AIRBUS HELICOPTERS H-160

Hex
3B9B21
Octal
16715441
Decimal
3,906,337
Country
FR
Tail
F-HTNS
Type
H160
No current signal · last broadcast 1d ago
Flights observed
46
Distinct callsigns
2
Country
FR
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 3B9B21.

Country allocation

The ICAO 24-bit address 3B9B21 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 2 distinct

Callsign Airline Flights Last seen
BELIGOUT - 29 2026-07-24
RESCUEBT - 17 2026-07-26

Recent flights last 46

DateFlightRouteTakeoffLandingDuration
2026-07-26 RESCUEBT - Jul 26, 15:05 UTCJul 26, 15:55 UTC50m
2026-07-24 RESCUEBT - Jul 24, 15:55 UTCJul 24, 16:40 UTC45m
2026-07-24 BELIGOUT - Jul 24, 13:55 UTCJul 24, 15:00 UTC1h 5m
2026-07-23 BELIGOUT - Jul 23, 19:20 UTCJul 23, 20:55 UTC1h 35m
2026-07-23 BELIGOUT - Jul 23, 15:15 UTCJul 23, 16:15 UTC1h 0m
2026-07-22 BELIGOUT - Jul 22, 13:45 UTCJul 22, 14:25 UTC40m
2026-07-21 BELIGOUT - Jul 21, 18:20 UTCJul 21, 18:55 UTC35m
2026-07-21 BELIGOUT - Jul 21, 17:50 UTCJul 21, 18:15 UTC25m
2026-07-21 BELIGOUT - Jul 21, 12:40 UTCJul 21, 13:50 UTC1h 10m
2026-07-18 BELIGOUT - Jul 18, 12:40 UTCJul 18, 14:00 UTC1h 20m
2026-07-13 BELIGOUT - Jul 13, 19:50 UTCJul 13, 20:35 UTC45m
2026-07-13 BELIGOUT - Jul 13, 16:00 UTCJul 13, 16:40 UTC40m
2026-07-12 RESCUEBT TLN → TLN Jul 12, 17:10 UTCJul 12, 18:15 UTC1h 5m
2026-07-12 BELIGOUT - Jul 12, 15:30 UTCJul 12, 16:10 UTC40m
2026-07-12 BELIGOUT - Jul 12, 14:05 UTCJul 12, 14:50 UTC45m
2026-07-12 RESCUEBT - Jul 12, 10:30 UTCJul 12, 11:01 UTC30m
2026-07-11 BELIGOUT - Jul 11, 19:40 UTCJul 11, 21:15 UTC1h 35m
2026-07-09 BELIGOUT - Jul 9, 13:35 UTCJul 9, 14:20 UTC45m
2026-07-09 BELIGOUT - Jul 9, 12:50 UTCJul 9, 13:00 UTC10m
2026-07-08 BELIGOUT - Jul 8, 19:55 UTCJul 8, 21:35 UTC1h 40m
2026-07-07 RESCUEBT - Jul 7, 19:10 UTCJul 7, 19:20 UTC10m
2026-07-07 RESCUEBT - Jul 7, 18:05 UTCJul 7, 18:30 UTC25m
2026-07-07 RESCUEBT - Jul 7, 16:20 UTCJul 7, 17:20 UTC1h 0m
2026-07-07 RESCUEBT - Jul 7, 16:00 UTCJul 7, 16:15 UTC15m
2026-07-07 BELIGOUT - Jul 7, 14:05 UTCJul 7, 14:55 UTC50m
2026-07-05 RESCUEBT - Jul 5, 13:40 UTCJul 5, 13:50 UTC10m
2026-07-05 RESCUEBT - Jul 5, 12:30 UTCJul 5, 13:05 UTC35m
2026-07-05 RESCUEBT TLN → LTT Jul 5, 11:15 UTCJul 5, 11:55 UTC40m
2026-06-30 BELIGOUT - Jun 30, 15:00 UTCJun 30, 15:40 UTC40m
2026-06-29 BELIGOUT - Jun 29, 12:09 UTCJun 29, 12:55 UTC45m
2026-06-28 BELIGOUT - Jun 28, 07:54 UTCJun 28, 08:39 UTC45m
2026-06-27 BELIGOUT - Jun 27, 12:45 UTCJun 27, 14:09 UTC1h 25m
2026-06-27 BELIGOUT - Jun 27, 08:55 UTCJun 27, 09:04 UTC10m
2026-06-27 BELIGOUT - Jun 27, 06:25 UTCJun 27, 06:40 UTC15m
2026-06-25 BELIGOUT - Jun 25, 19:29 UTCJun 25, 21:59 UTC2h 30m
2026-06-23 RESCUEBT - Jun 23, 02:45 UTCJun 23, 03:04 UTC20m
2026-06-21 RESCUEBT - Jun 21, 13:54 UTCJun 21, 15:44 UTC1h 50m
2026-06-18 BELIGOUT - Jun 18, 17:45 UTCJun 18, 18:30 UTC45m
2026-06-17 BELIGOUT - Jun 17, 14:50 UTCJun 17, 16:00 UTC1h 10m
2026-06-14 RESCUEBT - Jun 14, 02:35 UTCJun 14, 03:15 UTC40m
2026-06-13 RESCUEBT - Jun 13, 11:15 UTCJun 13, 11:55 UTC40m
2026-06-12 BELIGOUT - Jun 12, 08:25 UTCJun 12, 09:00 UTC35m
2026-06-10 RESCUEBT - Jun 10, 19:00 UTCJun 10, 20:00 UTC1h 0m
2026-06-10 RESCUEBT - Jun 10, 17:15 UTCJun 10, 17:25 UTC10m
2026-06-10 BELIGOUT - Jun 10, 13:00 UTCJun 10, 13:40 UTC40m
2026-06-09 BELIGOUT - Jun 9, 14:35 UTCJun 9, 15:10 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-HTNS page for operator, model, and routing details .

Mode-S 3B9B21 frequently asked

What is Mode-S code 3B9B21?
3B9B21 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HTNS.
Where is Mode-S 3B9B21 registered?
Mode-S code 3B9B21 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3B9B21 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3B9B21, octal 16715441, decimal 3,906,337.
What flights does 3B9B21 operate?
Mode-S 3B9B21 has broadcast 2 distinct callsigns, including BELIGOUT, RESCUEBT.