Apparatus

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sensors Mode-S transponder

841FF4

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA08XJ · AIRBUS A-350-900

Hex
841FF4
Octal
41017764
Decimal
8,658,932
Country
JP
Tail
JA08XJ
Type
A359
No current signal · last broadcast 2h ago
Flights observed
310
Distinct callsigns
20
Country
JP
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 841FF4.

Country allocation

The ICAO 24-bit address 841FF4 falls within the block assigned to Japan (JP) by ICAO Annex 10, Volume III. Every aircraft registered in Japan 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
JAL915 - 17 2026-07-13
JAL306 - 16 2026-07-13
JAL914 - 15 2026-07-13
JAL333 - 15 2026-07-13
JAL314 Japan Airlines 15 2026-06-06
JAL303 - 13 2026-07-12
JAL302 - 13 2026-07-13
JAL328 Japan Airlines 12 2026-06-06
JAL313 Japan Airlines 11 2026-06-06
JAL325 Japan Airlines 10 2026-06-06
JAL504 - 7 2026-07-11
JAL503 - 7 2026-07-10
JAL335 - 7 2026-07-08
JAL327 - 7 2026-07-12
JAL322 - 7 2026-07-08
JAL321 - 7 2026-07-08
JAL310 - 7 2026-07-08
JAL307 Japan Airlines 7 2026-07-07
JAL300 - 7 2026-07-08
JAL909 - 6 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 JAL302 - Jul 13, 22:45 UTCJul 14, 00:15 UTC1h 30m
2026-07-13 JAL333 - Jul 13, 11:15 UTCJul 13, 12:20 UTC1h 5m
2026-07-13 JAL914 - Jul 13, 08:35 UTCJul 13, 09:45 UTC1h 10m
2026-07-13 JAL914 - Jul 13, 07:05 UTCJul 13, 07:20 UTC15m
2026-07-13 JAL915 - Jul 13, 03:40 UTCJul 13, 05:35 UTC1h 55m
2026-07-13 JAL306 - Jul 13, 00:25 UTCJul 13, 01:50 UTC1h 25m
2026-07-12 JAL303 - Jul 12, 21:40 UTCJul 12, 22:45 UTC1h 5m
2026-07-12 JAL330 - Jul 12, 11:30 UTCJul 12, 13:01 UTC1h 30m
2026-07-12 JAL327 - Jul 12, 08:35 UTCJul 12, 09:45 UTC1h 10m
2026-07-12 JAL316 - Jul 12, 05:25 UTCJul 12, 06:50 UTC1h 25m
2026-07-12 JAL315 - Jul 12, 02:30 UTCJul 12, 03:30 UTC1h 0m
2026-07-11 JAL304 - Jul 11, 23:40 UTCJul 12, 01:05 UTC1h 25m
2026-07-11 JAL331 - Jul 11, 10:20 UTCJul 11, 11:20 UTC1h 0m
2026-07-11 JAL320 - Jul 11, 07:10 UTCJul 11, 08:35 UTC1h 25m
2026-07-11 JAL319 - Jul 11, 04:15 UTCJul 11, 05:20 UTC1h 5m
2026-07-11 JAL504 - Jul 11, 01:15 UTCJul 11, 02:30 UTC1h 15m
2026-07-10 JAL503 - Jul 10, 22:40 UTCJul 11, 00:00 UTC1h 20m
2026-07-09 JAL526 - Jul 9, 11:45 UTCJul 9, 13:05 UTC1h 20m
2026-07-09 JAL525 HND → CTS Jul 9, 09:20 UTCJul 9, 10:35 UTC1h 15m
2026-07-09 JAL910 - Jul 9, 06:00 UTCJul 9, 06:50 UTC50m
2026-07-09 JAL910 - Jul 9, 04:40 UTCJul 9, 05:00 UTC20m
2026-07-09 JAL909 - Jul 9, 01:10 UTCJul 9, 03:10 UTC2h 0m
2026-07-08 JAL300 - Jul 8, 22:20 UTCJul 8, 23:50 UTC1h 30m
2026-07-08 JAL335 - Jul 8, 10:55 UTCJul 8, 12:15 UTC1h 20m
2026-07-08 JAL322 - Jul 8, 08:00 UTCJul 8, 09:20 UTC1h 20m
2026-07-08 JAL321 - Jul 8, 05:05 UTCJul 8, 06:05 UTC1h 0m
2026-07-08 JAL310 - Jul 8, 02:20 UTCJul 8, 03:40 UTC1h 20m
2026-07-07 JAL307 HND → FUK Jul 7, 23:25 UTCJul 8, 00:25 UTC1h 0m
2026-07-07 JAL526 - Jul 7, 11:30 UTCJul 7, 12:40 UTC1h 10m
2026-07-07 JAL525 - Jul 7, 08:45 UTCJul 7, 10:00 UTC1h 15m
2026-07-07 JAL910 - Jul 7, 04:30 UTCJul 7, 06:30 UTC2h 0m
2026-07-07 JAL909 - Jul 7, 01:00 UTCJul 7, 03:05 UTC2h 5m
2026-07-06 JAL300 - Jul 6, 22:20 UTCJul 6, 23:40 UTC1h 20m
2026-07-06 JAL335 - Jul 6, 11:10 UTCJul 6, 12:15 UTC1h 5m
2026-07-06 JAL322 - Jul 6, 07:55 UTCJul 6, 09:15 UTC1h 20m
2026-07-06 JAL321 - Jul 6, 05:10 UTCJul 6, 06:15 UTC1h 5m
2026-07-06 JAL310 - Jul 6, 02:20 UTCJul 6, 03:35 UTC1h 15m
2026-07-05 JAL307 HND → FUK Jul 5, 23:25 UTCJul 6, 00:40 UTC1h 15m
2026-07-04 JAL8154 - Jul 4, 20:10 UTCJul 4, 21:40 UTC1h 30m
2026-06-10 JAL8151 - Jun 10, 18:10 UTCJun 10, 19:35 UTC1h 25m
2026-06-10 JAL326 FUK → HND Jun 10, 09:45 UTCJun 10, 10:55 UTC1h 10m
2026-06-10 JAL323 HND → FUK Jun 10, 06:45 UTCJun 10, 08:00 UTC1h 15m
2026-06-10 JAL508 CTS → HND Jun 10, 02:50 UTCJun 10, 04:15 UTC1h 25m
2026-06-10 JAL507 HND → CTS Jun 10, 00:30 UTCJun 10, 01:35 UTC1h 5m
2026-06-09 JAL330 FUK → HND Jun 9, 11:25 UTCJun 9, 12:45 UTC1h 20m
2026-06-09 JAL327 HND → FUK Jun 9, 08:30 UTCJun 9, 09:40 UTC1h 10m
2026-06-09 JAL316 FUK → HND Jun 9, 05:40 UTCJun 9, 07:00 UTC1h 20m
2026-06-09 JAL315 HND → FUK Jun 9, 02:50 UTCJun 9, 04:00 UTC1h 10m
2026-06-08 JAL304 FUK → HND Jun 8, 23:30 UTCJun 9, 00:35 UTC1h 5m
2026-06-08 JAL331 HND → FUK Jun 8, 10:20 UTCJun 8, 11:35 UTC1h 15m

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 JA08XJ page for operator, model, and routing details .

Mode-S 841FF4 frequently asked

What is Mode-S code 841FF4?
841FF4 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA08XJ.
Where is Mode-S 841FF4 registered?
Mode-S code 841FF4 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 841FF4 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 841FF4, octal 41017764, decimal 8,658,932.
What flights does 841FF4 operate?
Mode-S 841FF4 has broadcast 20 distinct callsigns, including JAL915, JAL306, JAL914, JAL333, JAL314.