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 Jul 26, 11:40 UTC
Flights observed
179
Distinct callsigns
20
Country
FR
Last broadcast
Jul 26, 11:40 UTC

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
AFR181 Air France 12 2026-07-24
AFR202 Air France 11 2026-07-21
AFR182 Air France 11 2026-07-23
AFR923 - 10 2026-07-12
AFR201 Air France 10 2026-07-22
AFR074 Air France 9 2026-06-15
AFR75K - 8 2026-06-15
AFR926 - 7 2026-07-11
AFR940 Air France 6 2026-04-26
AFR902 Air France 6 2026-04-29
AFR551 - 6 2026-07-15
AFR343 - 6 2026-07-05
AFR342T - 6 2026-07-05
AFR570 - 5 2026-07-14
AFR471 - 5 2026-07-09
AFR468 - 5 2026-07-08
AFR32J Air France 5 2026-05-21
AFR194 Air France 5 2026-07-25
AFR191 Air France 5 2026-07-25
AFR754 - 4 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AFR722 CDG → FIH Jul 26, 10:10 UTCJul 26, 11:40 UTC1h 30m
2026-07-25 AFR191 BLR → CDG Jul 25, 21:00 UTCJul 26, 06:00 UTC9h 0m
2026-07-25 AFR191 BLR → CDG Jul 25, 20:15 UTCJul 25, 20:25 UTC10m
2026-07-25 AFR194 CDG → BLR Jul 25, 17:55 UTCJul 25, 18:10 UTC15m
2026-07-25 AFR194 CDG → BLR Jul 25, 09:10 UTCJul 25, 13:15 UTC4h 5m
2026-07-24 AFR181 SIN → CDG Jul 24, 03:10 UTCJul 24, 16:05 UTC12h 55m
2026-07-23 AFR182 CDG → SIN Jul 23, 12:35 UTCJul 24, 00:30 UTC11h 55m
2026-07-22 AFR201 PEK → CDG Jul 22, 19:40 UTCJul 23, 03:40 UTC8h 0m
2026-07-22 AFR201 PEK → CDG Jul 22, 15:55 UTCJul 22, 16:10 UTC15m
2026-07-21 AFR202 CDG → BOM Jul 21, 21:15 UTCJul 22, 01:05 UTC3h 50m
2026-07-21 AFR181 - Jul 21, 03:10 UTCJul 21, 16:10 UTC13h 0m
2026-07-20 AFR182 - Jul 20, 12:10 UTCJul 20, 23:55 UTC11h 44m
2026-07-19 AFR191 BLR → CDG Jul 19, 21:10 UTCJul 20, 06:15 UTC9h 5m
2026-07-19 AFR191 BLR → CDG Jul 19, 20:20 UTCJul 19, 20:35 UTC15m
2026-07-19 AFR194 - Jul 19, 17:35 UTCJul 19, 17:50 UTC15m
2026-07-19 AFR194 - Jul 19, 08:50 UTCJul 19, 12:50 UTC4h 0m
2026-07-17 AFR201 - Jul 17, 15:29 UTCJul 18, 03:25 UTC11h 56m
2026-07-17 AFR202 - Jul 17, 07:35 UTCJul 17, 07:50 UTC15m
2026-07-16 AFR202 - Jul 16, 22:10 UTCJul 17, 02:10 UTC4h 0m
2026-07-15 AFR551 - Jul 15, 02:35 UTCJul 15, 06:40 UTC4h 5m
2026-07-15 AFR551 - Jul 15, 02:20 UTCJul 15, 02:30 UTC10m
2026-07-14 AFR570 - Jul 14, 20:25 UTCJul 15, 00:10 UTC3h 44m
2026-07-14 AFR181 - Jul 14, 03:55 UTCJul 14, 16:40 UTC12h 45m
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

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 Jul 26, 11:40 UTC.
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 AFR181, AFR202, AFR182, AFR923, AFR201.