Apparatus

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sensors Mode-S transponder

39C421

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-HRBB · BOEING 787-9 Dreamliner

Hex
39C421
Octal
16342041
Decimal
3,785,761
Country
FR
Tail
F-HRBB
Type
B789
No current signal · last broadcast 1h ago
Flights observed
157
Distinct callsigns
20
Country
FR
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 39C421.

Country allocation

The ICAO 24-bit address 39C421 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 20 distinct

Callsign Airline Flights Last seen
AFR923 - 10 2026-07-12
AFR181 - 10 2026-07-14
AFR182 - 9 2026-07-13
AFR074 Air France 9 2026-06-15
AFR75K - 8 2026-06-15
AFR202 - 8 2026-07-03
AFR926 - 7 2026-07-11
AFR201 - 7 2026-07-03
AFR940 Air France 6 2026-04-26
AFR902 Air France 6 2026-04-29
AFR343 - 6 2026-07-05
AFR342T - 6 2026-07-05
AFR471 - 5 2026-07-09
AFR468 - 5 2026-07-08
AFR32J Air France 5 2026-05-21
AFR754 - 4 2026-06-30
AFR570 - 4 2026-07-09
AFR551 - 4 2026-07-10
AFR416 Air France 4 2026-05-12
AFR415 Air France 4 2026-05-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AFR181 - Jul 14, 03:55 UTCJul 14, 04:45 UTC50m
2026-07-13 AFR182 - Jul 13, 13:35 UTCJul 14, 01:50 UTC12h 15m
2026-07-13 AFR722 - Jul 13, 04:25 UTCJul 13, 06:20 UTC1h 55m
2026-07-12 AFR722 - Jul 12, 10:20 UTCJul 13, 06:20 UTC20h 0m
2026-07-12 AFR722 - Jul 12, 09:25 UTCJul 13, 06:20 UTC20h 55m
2026-07-12 AFR923 - Jul 12, 02:01 UTCJul 12, 04:15 UTC2h 15m
2026-07-11 AFR926 - Jul 11, 09:45 UTCJul 11, 16:20 UTC6h 35m
2026-07-10 AFR191 - Jul 10, 20:20 UTCJul 11, 05:50 UTC9h 31m
2026-07-10 AFR194 - Jul 10, 08:55 UTCJul 10, 17:35 UTC8h 40m
2026-07-10 AFR551 - Jul 10, 00:45 UTCJul 10, 04:40 UTC3h 55m
2026-07-09 AFR570 - Jul 9, 18:40 UTCJul 9, 22:30 UTC3h 50m
2026-07-09 AFR471 - Jul 9, 03:15 UTCJul 9, 15:35 UTC12h 20m
2026-07-08 AFR468 - Jul 8, 12:00 UTCJul 9, 00:50 UTC12h 50m
2026-07-07 AFR923 - Jul 7, 09:30 UTCJul 8, 03:25 UTC17h 55m
2026-07-06 AFR736 - Jul 6, 10:20 UTCJul 7, 05:05 UTC18h 45m
2026-07-06 AFR736 - Jul 6, 09:50 UTCJul 7, 05:05 UTC19h 15m
2026-07-05 AFR343 YUL → CDG Jul 5, 21:25 UTCJul 6, 03:20 UTC5h 55m
2026-07-05 AFR342T - Jul 5, 09:05 UTCJul 5, 15:55 UTC6h 50m
2026-07-04 AFR343 YUL → CDG Jul 4, 21:20 UTCJul 5, 03:25 UTC6h 5m
2026-07-04 AFR342T - Jul 4, 08:55 UTCJul 4, 15:55 UTC7h 0m
2026-07-03 AFR201 - Jul 3, 15:35 UTCJul 4, 03:35 UTC12h 0m
2026-07-03 AFR202 - Jul 3, 07:10 UTCJul 3, 07:30 UTC20m
2026-07-02 AFR202 - Jul 2, 21:20 UTCJul 3, 01:25 UTC4h 5m
2026-07-02 AFR291 - Jul 2, 02:50 UTCJul 2, 17:00 UTC14h 10m
2026-07-01 AFR292 - Jul 1, 12:25 UTCJul 2, 00:30 UTC12h 5m
2026-06-30 AFR754 - Jun 30, 10:20 UTCJul 1, 04:55 UTC18h 35m
2026-06-30 AFR754 - Jun 30, 10:05 UTCJul 1, 04:55 UTC18h 50m
2026-06-30 AFR551 - Jun 30, 01:50 UTCJun 30, 05:40 UTC3h 50m
2026-06-29 AFR570 - Jun 29, 19:20 UTCJun 29, 23:05 UTC3h 45m
2026-06-29 AFR471 CCS → CDG Jun 29, 03:20 UTCJun 29, 15:49 UTC12h 30m
2026-06-28 AFR468 - Jun 28, 12:15 UTCJun 29, 01:10 UTC12h 55m
2026-06-27 AFR754 - Jun 27, 10:19 UTCJun 28, 04:50 UTC18h 30m
2026-06-27 AFR754 - Jun 27, 09:44 UTCJun 28, 04:50 UTC19h 5m
2026-06-26 AFR923 - Jun 26, 09:45 UTCJun 27, 03:20 UTC17h 35m
2026-06-21 AFR181 - Jun 21, 07:59 UTCJun 21, 21:14 UTC13h 15m
2026-06-20 AFR182 - Jun 20, 12:04 UTCJun 20, 23:45 UTC11h 40m
2026-06-19 AFR343 YUL → CDG Jun 19, 21:39 UTCJun 20, 03:44 UTC6h 5m
2026-06-19 AFR342T - Jun 19, 08:50 UTCJun 19, 15:39 UTC6h 50m
2026-06-16 AFR923 - Jun 16, 09:04 UTCJun 17, 03:35 UTC18h 31m
2026-06-15 AFR75K - Jun 15, 22:30 UTCJun 16, 05:20 UTC6h 50m
2026-06-15 AFR074 CDG → RDU Jun 15, 11:30 UTCJun 15, 19:39 UTC8h 10m
2026-06-15 AFR551 - Jun 15, 00:55 UTCJun 15, 04:55 UTC4h 0m
2026-06-14 AFR570 - Jun 14, 18:30 UTCJun 14, 21:55 UTC3h 25m
2026-06-14 AFR471 CCS → CDG Jun 14, 03:20 UTCJun 14, 15:40 UTC12h 20m
2026-06-13 AFR468 CDG → EZE Jun 13, 11:55 UTCJun 14, 01:00 UTC13h 5m
2026-06-11 AFR471 CCS → CDG Jun 11, 03:10 UTCJun 11, 15:25 UTC12h 15m
2026-06-10 AFR468 CDG → CCS Jun 10, 11:55 UTCJun 11, 00:45 UTC12h 50m
2026-06-09 AFR923 LBV → CDG Jun 9, 01:10 UTCJun 9, 03:45 UTC2h 35m
2026-06-08 AFR926 CDG → LBV Jun 8, 09:30 UTCJun 8, 16:05 UTC6h 35m
2026-06-06 AFR923 LBV → CDG Jun 6, 00:50 UTCJun 6, 03:35 UTC2h 45m

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-HRBB page for operator, model, and routing details .

Mode-S 39C421 frequently asked

What is Mode-S code 39C421?
39C421 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HRBB.
Where is Mode-S 39C421 registered?
Mode-S code 39C421 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 39C421 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 39C421, octal 16342041, decimal 3,785,761.
What flights does 39C421 operate?
Mode-S 39C421 has broadcast 20 distinct callsigns, including AFR923, AFR181, AFR182, AFR074, AFR75K.