Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 Jul 26, 14:00 UTC
Flights observed
362
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 14:00 UTC

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
JAL314 Japan Airlines 17 2026-07-26
JAL306 - 16 2026-07-13
JAL914 - 15 2026-07-13
JAL333 - 15 2026-07-13
JAL302 Japan Airlines 14 2026-07-25
JAL328 - 13 2026-07-14
JAL313 Japan Airlines 13 2026-07-26
JAL303 - 13 2026-07-12
JAL325 - 11 2026-07-14
JAL504 Japan Airlines 10 2026-07-25
JAL503 Japan Airlines 10 2026-07-24
JAL526 Japan Airlines 8 2026-07-21
JAL525 Japan Airlines 8 2026-07-21
JAL508 Japan Airlines 8 2026-07-22
JAL507 Japan Airlines 8 2026-07-22
JAL327 Japan Airlines 8 2026-07-26
JAL335 - 7 2026-07-08
JAL330 Japan Airlines 7 2026-07-26
JAL322 - 7 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JAL330 FUK → HND Jul 26, 12:40 UTCJul 26, 13:55 UTC1h 15m
2026-07-26 JAL327 HND → FUK Jul 26, 09:30 UTCJul 26, 10:30 UTC1h 0m
2026-07-26 JAL314 FUK → HND Jul 26, 05:35 UTCJul 26, 06:55 UTC1h 21m
2026-07-26 JAL313 HND → FUK Jul 26, 01:40 UTCJul 26, 03:05 UTC1h 25m
2026-07-25 JAL302 FUK → HND Jul 25, 22:50 UTCJul 26, 00:15 UTC1h 25m
2026-07-25 JAL331 HND → FUK Jul 25, 10:55 UTCJul 25, 12:10 UTC1h 15m
2026-07-25 JAL320 FUK → HND Jul 25, 07:30 UTCJul 25, 08:50 UTC1h 20m
2026-07-25 JAL319 HND → FUK Jul 25, 04:25 UTCJul 25, 05:45 UTC1h 20m
2026-07-25 JAL504 CTS → HND Jul 25, 01:30 UTCJul 25, 02:35 UTC1h 5m
2026-07-24 JAL503 HND → CTS Jul 24, 22:55 UTCJul 25, 00:10 UTC1h 15m
2026-07-24 JAL528 CTS → HND Jul 24, 14:25 UTCJul 24, 15:50 UTC1h 25m
2026-07-24 JAL527 HND → CTS Jul 24, 11:55 UTCJul 24, 13:10 UTC1h 15m
2026-07-24 JAL516 CTS → HND Jul 24, 08:35 UTCJul 24, 10:10 UTC1h 35m
2026-07-24 JAL517 HND → CTS Jul 24, 05:10 UTCJul 24, 06:30 UTC1h 20m
2026-07-24 JAL506 CTS → HND Jul 24, 02:35 UTCJul 24, 03:45 UTC1h 10m
2026-07-24 JAL505 HND → CTS Jul 24, 00:00 UTCJul 24, 01:15 UTC1h 15m
2026-07-22 JAL508 CTS → HND Jul 22, 03:05 UTCJul 22, 04:20 UTC1h 15m
2026-07-22 JAL507 HND → CTS Jul 22, 00:25 UTCJul 22, 01:35 UTC1h 10m
2026-07-21 JAL526 CTS → HND Jul 21, 12:35 UTCJul 21, 13:45 UTC1h 10m
2026-07-21 JAL525 HND → CTS Jul 21, 10:10 UTCJul 21, 11:20 UTC1h 10m
2026-07-21 JAL514 CTS → HND Jul 21, 07:05 UTCJul 21, 08:25 UTC1h 20m
2026-07-21 JAL515 HND → CTS Jul 21, 04:30 UTCJul 21, 05:40 UTC1h 10m
2026-07-21 JAL504 CTS → HND Jul 21, 01:25 UTCJul 21, 02:40 UTC1h 15m
2026-07-20 JAL503 HND → CTS Jul 20, 22:45 UTCJul 20, 23:55 UTC1h 9m
2026-07-20 JAL528 CTS → HND Jul 20, 14:10 UTCJul 20, 15:35 UTC1h 25m
2026-07-20 JAL527 HND → CTS Jul 20, 11:35 UTCJul 20, 12:45 UTC1h 10m
2026-07-20 JAL516 CTS → HND Jul 20, 08:45 UTCJul 20, 09:55 UTC1h 10m
2026-07-20 JAL517 HND → CTS Jul 20, 06:00 UTCJul 20, 07:05 UTC1h 5m
2026-07-20 JAL508 CTS → HND Jul 20, 03:00 UTCJul 20, 04:20 UTC1h 20m
2026-07-20 JAL507 HND → CTS Jul 20, 00:30 UTCJul 20, 01:40 UTC1h 10m
2026-07-19 JAL332 FUK → HND Jul 19, 12:45 UTCJul 19, 14:05 UTC1h 20m
2026-07-19 JAL329 HND → FUK Jul 19, 10:00 UTCJul 19, 11:05 UTC1h 5m
2026-07-19 JAL514 CTS → HND Jul 19, 07:05 UTCJul 19, 08:15 UTC1h 10m
2026-07-19 JAL515 HND → CTS Jul 19, 04:30 UTCJul 19, 05:45 UTC1h 15m
2026-07-19 JAL504 - Jul 19, 01:35 UTCJul 19, 02:50 UTC1h 15m
2026-07-18 JAL503 HND → CTS Jul 18, 23:00 UTCJul 19, 00:15 UTC1h 15m
2026-07-18 JAL920 - Jul 18, 12:25 UTCJul 18, 13:10 UTC45m
2026-07-18 JAL920 - Jul 18, 11:05 UTCJul 18, 11:20 UTC15m
2026-07-18 JAL921 - Jul 18, 09:10 UTCJul 18, 09:30 UTC20m
2026-07-18 JAL921 - Jul 18, 07:35 UTCJul 18, 08:15 UTC40m
2026-07-17 JAL508 - Jul 17, 03:34 UTCJul 17, 04:44 UTC1h 10m
2026-07-17 JAL507 - Jul 17, 00:45 UTCJul 17, 01:59 UTC1h 15m
2026-07-16 JAL526 - Jul 16, 12:00 UTCJul 16, 13:10 UTC1h 10m
2026-07-16 JAL525 - Jul 16, 09:20 UTCJul 16, 10:35 UTC1h 15m
2026-07-16 JAL506 - Jul 16, 03:00 UTCJul 16, 04:20 UTC1h 20m
2026-07-16 JAL505 - Jul 16, 00:30 UTCJul 16, 01:40 UTC1h 10m
2026-07-15 JAL508 - Jul 15, 03:40 UTCJul 15, 04:50 UTC1h 10m
2026-07-15 JAL507 HND → CTS Jul 15, 01:00 UTCJul 15, 02:15 UTC1h 15m
2026-07-14 JAL328 - Jul 14, 10:20 UTCJul 14, 11:45 UTC1h 25m
2026-07-14 JAL325 - Jul 14, 07:25 UTCJul 14, 08:25 UTC1h 0m

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 Jul 26, 14:00 UTC.
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, JAL314, JAL306, JAL914, JAL333.