Apparatus

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sensors Mode-S transponder

841043

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA04GR · BOEING 737-800

Hex
841043
Octal
41010103
Decimal
8,654,915
Country
JP
Tail
JA04GR
Type
B738
No current signal · last broadcast Jul 26, 12:55 UTC
Flights observed
152
Distinct callsigns
16
Country
JP
Last broadcast
Jul 26, 12:55 UTC

Last known position

Most recent position reported by Mode-S 841043.

Country allocation

The ICAO 24-bit address 841043 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 16 distinct

Callsign Airline Flights Last seen
JAL8680 - 40 2026-07-20
JAL8689 - 26 2026-07-19
JAL8695 - 24 2026-07-26
JAL8799 - 13 2026-07-07
JAL8790 - 10 2026-07-10
SJO858 Spring Japan 9 2026-07-26
SJO857 Spring Japan 9 2026-07-25
JAL8696 - 7 2026-07-23
SJO621 Spring Japan 5 2026-06-18
SJO622 - 3 2026-06-19
SJO9812 - 1 2026-06-14
SJO9811 - 1 2026-05-17
SJO9420 - 1 2026-06-20
SJO838 Spring Japan 1 2026-06-21
SJO752 Spring Japan 1 2026-06-21
SJO751 Spring Japan 1 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JAL8695 NRT → NRT Jul 26, 05:25 UTCJul 26, 12:45 UTC7h 21m
2026-07-26 SJO858 HKD → NRT Jul 26, 02:05 UTCJul 26, 03:05 UTC1h 0m
2026-07-25 SJO857 NRT → HKD Jul 25, 23:50 UTCJul 26, 01:00 UTC1h 10m
2026-07-25 JAL8695 NRT → NRT Jul 25, 05:15 UTCJul 25, 13:10 UTC7h 55m
2026-07-25 SJO858 HKD → NRT Jul 25, 02:05 UTCJul 25, 03:20 UTC1h 15m
2026-07-24 SJO857 NRT → HKD Jul 24, 23:50 UTCJul 25, 00:55 UTC1h 5m
2026-07-24 JAL8695 NRT → NRT Jul 24, 05:25 UTCJul 24, 12:25 UTC7h 0m
2026-07-24 SJO858 HKD → NRT Jul 24, 02:05 UTCJul 24, 03:10 UTC1h 5m
2026-07-23 SJO857 NRT → HKD Jul 23, 23:50 UTCJul 24, 01:00 UTC1h 10m
2026-07-23 JAL8696 NRT → NRT Jul 23, 05:20 UTCJul 23, 12:35 UTC7h 15m
2026-07-23 SJO858 HKD → NRT Jul 23, 02:05 UTCJul 23, 03:10 UTC1h 5m
2026-07-22 SJO857 NRT → HKD Jul 22, 23:45 UTCJul 23, 00:50 UTC1h 5m
2026-07-22 JAL8696 - Jul 22, 11:10 UTCJul 22, 12:25 UTC1h 15m
2026-07-22 SJO858 HKD → NRT Jul 22, 02:10 UTCJul 22, 03:20 UTC1h 10m
2026-07-21 SJO857 NRT → HKD Jul 21, 23:45 UTCJul 22, 00:50 UTC1h 5m
2026-07-21 JAL8695 NRT → NRT Jul 21, 05:25 UTCJul 21, 12:30 UTC7h 5m
2026-07-21 SJO858 HKD → NRT Jul 21, 02:15 UTCJul 21, 03:25 UTC1h 10m
2026-07-20 SJO857 NRT → HKD Jul 20, 23:55 UTCJul 21, 01:00 UTC1h 5m
2026-07-20 JAL8680 - Jul 20, 04:00 UTCJul 20, 06:15 UTC2h 15m
2026-07-20 JAL8680 - Jul 20, 03:10 UTCJul 20, 03:20 UTC10m
2026-07-19 JAL8689 - Jul 19, 09:25 UTCJul 19, 11:35 UTC2h 10m
2026-07-18 JAL8680 - Jul 18, 10:50 UTCJul 19, 06:20 UTC19h 30m
2026-07-18 JAL8680 NRT → NRT Jul 18, 09:25 UTCJul 19, 06:20 UTC20h 55m
2026-07-17 JAL8680 - Jul 17, 10:55 UTCJul 18, 06:20 UTC19h 26m
2026-07-17 JAL8680 - Jul 17, 09:30 UTCJul 18, 06:20 UTC20h 51m
2026-07-17 JAL8680 - Jul 17, 04:44 UTCJul 17, 06:50 UTC2h 5m
2026-07-16 JAL8680 - Jul 16, 10:50 UTCJul 17, 06:50 UTC20h 0m
2026-07-16 JAL8689 NRT → NRT Jul 16, 09:30 UTCJul 17, 06:50 UTC21h 20m
2026-07-16 JAL8680 - Jul 16, 04:00 UTCJul 16, 06:15 UTC2h 15m
2026-07-16 JAL8680 - Jul 16, 03:05 UTCJul 16, 03:15 UTC10m
2026-07-15 JAL8689 - Jul 15, 09:05 UTCJul 15, 11:20 UTC2h 15m
2026-07-15 JAL8680 - Jul 15, 04:05 UTCJul 15, 06:10 UTC2h 5m
2026-07-14 JAL8689 - Jul 14, 09:30 UTCJul 14, 11:25 UTC1h 55m
2026-07-14 JAL8680 - Jul 14, 04:10 UTCJul 14, 06:20 UTC2h 10m
2026-07-13 JAL8689 - Jul 13, 09:25 UTCJul 13, 11:25 UTC2h 0m
2026-07-13 JAL8680 - Jul 13, 04:20 UTCJul 13, 06:35 UTC2h 15m
2026-07-12 JAL8689 - Jul 12, 09:20 UTCJul 12, 11:15 UTC1h 55m
2026-07-12 JAL8680 - Jul 12, 04:20 UTCJul 12, 06:35 UTC2h 15m
2026-07-11 JAL8689 - Jul 11, 09:25 UTCJul 11, 11:20 UTC1h 55m
2026-07-10 JAL8790 - Jul 10, 10:50 UTCJul 11, 05:01 UTC18h 11m
2026-07-10 JAL8790 NRT → NRT Jul 10, 10:40 UTCJul 11, 05:01 UTC18h 21m
2026-07-10 JAL8680 - Jul 10, 04:30 UTCJul 10, 06:40 UTC2h 10m
2026-07-10 JAL8680 - Jul 10, 03:30 UTCJul 10, 03:45 UTC15m
2026-07-09 JAL8689 - Jul 9, 09:20 UTCJul 9, 11:25 UTC2h 5m
2026-07-08 JAL8680 - Jul 8, 10:50 UTCJul 9, 06:30 UTC19h 40m
2026-07-08 JAL8689 NRT → NRT Jul 8, 09:25 UTCJul 9, 06:30 UTC21h 5m
2026-07-07 JAL8790 - Jul 7, 10:50 UTCJul 8, 05:15 UTC18h 25m
2026-07-07 JAL8799 - Jul 7, 10:40 UTCJul 8, 05:15 UTC18h 35m
2026-07-06 JAL8799 NRT → NRT Jul 6, 11:05 UTCJul 7, 05:15 UTC18h 10m
2026-07-06 JAL8680 - Jul 6, 05:15 UTCJul 6, 07:15 UTC2h 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 JA04GR page for operator, model, and routing details .

Mode-S 841043 frequently asked

What is Mode-S code 841043?
841043 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA04GR.
Where is Mode-S 841043 registered?
Mode-S code 841043 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 841043 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 12:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 841043, octal 41010103, decimal 8,654,915.
What flights does 841043 operate?
Mode-S 841043 has broadcast 16 distinct callsigns, including JAL8680, JAL8689, JAL8695, JAL8799, JAL8790.