Apparatus

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sensors Mode-S transponder

851848

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA331J · BOEING 737-800

Hex
851848
Octal
41214110
Decimal
8,722,504
Country
JP
Tail
JA331J
Type
B738
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
614
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S 851848.

Country allocation

The ICAO 24-bit address 851848 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
JAL487 Japan Airlines 7 2026-07-23
JAL474 Japan Airlines 7 2026-07-23
JAL266 Japan Airlines 7 2026-07-24
JAL265 Japan Airlines 7 2026-07-24
JAL614 - 6 2026-07-03
JAL542 Japan Airlines 6 2026-07-25
JAL479 Japan Airlines 6 2026-07-21
JAL376 Japan Airlines 6 2026-07-24
JAL375 Japan Airlines 6 2026-07-24
JAL480 Japan Airlines 5 2026-07-21
JAL478 Japan Airlines 5 2026-07-24
JAL477 Japan Airlines 5 2026-07-24
JAL465 Japan Airlines 5 2026-07-22
JAL462 - 5 2026-07-10
JAL461 - 5 2026-07-10
JAL452 Japan Airlines 5 2026-07-22
JAL438 Japan Airlines 5 2026-07-21
JAL437 Japan Airlines 5 2026-07-21
JAL434 - 5 2026-07-02
JAL433 - 5 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JAL623 HND → KMJ Jul 26, 21:35 UTCJul 26, 22:00 UTC25m
2026-07-25 JAL566 MMB → HND Jul 25, 11:20 UTCJul 25, 12:50 UTC1h 30m
2026-07-25 JAL569 HND → MMB Jul 25, 09:05 UTCJul 25, 10:30 UTC1h 25m
2026-07-25 JAL542 KUH → HND Jul 25, 06:20 UTCJul 25, 07:55 UTC1h 35m
2026-07-25 JAL543 HND → KUH Jul 25, 03:45 UTCJul 25, 04:50 UTC1h 5m
2026-07-25 JAL112 ITM → HND Jul 25, 01:35 UTCJul 25, 02:30 UTC55m
2026-07-24 JAL107 HND → ITM Jul 24, 23:50 UTCJul 25, 00:35 UTC45m
2026-07-24 JAL266 HIJ → HND Jul 24, 12:25 UTCJul 24, 13:30 UTC1h 5m
2026-07-24 JAL265 HND → HIJ Jul 24, 10:35 UTCJul 24, 11:35 UTC1h 0m
2026-07-24 JAL376 KKJ → HND Jul 24, 07:10 UTCJul 24, 09:00 UTC1h 50m
2026-07-24 JAL375 HND → KKJ Jul 24, 05:05 UTCJul 24, 06:05 UTC1h 0m
2026-07-24 JAL478 TAK → HND Jul 24, 02:50 UTCJul 24, 03:50 UTC1h 0m
2026-07-24 JAL477 HND → TAK Jul 24, 01:05 UTCJul 24, 01:50 UTC45m
2026-07-23 JAL474 TAK → HND Jul 23, 22:25 UTCJul 23, 23:25 UTC1h 0m
2026-07-23 JAL487 HND → TAK Jul 23, 11:40 UTCJul 23, 12:30 UTC50m
2026-07-23 JAL264 - Jul 23, 09:15 UTCJul 23, 10:25 UTC1h 10m
2026-07-23 JAL3406 CTS → HIJ Jul 23, 06:15 UTCJul 23, 07:50 UTC1h 35m
2026-07-23 JAL3513 FUK → CTS Jul 23, 03:20 UTCJul 23, 05:20 UTC2h 0m
2026-07-23 JAL309 HND → FUK Jul 23, 00:25 UTCJul 23, 01:30 UTC1h 5m
2026-07-22 JAL452 TKS → HND Jul 22, 22:15 UTCJul 22, 23:15 UTC1h 0m
2026-07-22 JAL465 HND → TKS Jul 22, 11:10 UTCJul 22, 11:45 UTC35m
2026-07-22 JAL3510 CTS → FUK Jul 22, 01:55 UTCJul 22, 04:15 UTC2h 20m
2026-07-21 JAL3101 NGO → CTS Jul 21, 23:20 UTCJul 22, 00:40 UTC1h 20m
2026-07-21 JAL209 HND → NGO Jul 21, 11:20 UTCJul 21, 11:55 UTC35m
2026-07-21 JAL438 MYJ → HND Jul 21, 08:55 UTCJul 21, 10:10 UTC1h 15m
2026-07-21 JAL437 HND → MYJ Jul 21, 06:50 UTCJul 21, 07:50 UTC1h 0m
2026-07-21 JAL480 TAK → HND Jul 21, 04:30 UTCJul 21, 05:30 UTC1h 0m
2026-07-21 JAL479 HND → TAK Jul 21, 02:30 UTCJul 21, 03:25 UTC55m
2026-07-21 JAL278 IZO → HND Jul 21, 00:30 UTCJul 21, 01:25 UTC55m
2026-07-20 JAL277 HND → IZO Jul 20, 22:25 UTCJul 20, 23:15 UTC50m
2026-07-20 JAL440 MYJ → HND Jul 20, 10:30 UTCJul 20, 11:40 UTC1h 10m
2026-07-20 JAL439 HND → MYJ Jul 20, 08:25 UTCJul 20, 09:25 UTC1h 0m
2026-07-20 JAL224 KIX → HND Jul 20, 06:10 UTCJul 20, 07:10 UTC1h 0m
2026-07-20 JAL225 HND → KIX Jul 20, 03:55 UTCJul 20, 05:00 UTC1h 5m
2026-07-20 JAL540 KUH → HND Jul 20, 01:30 UTCJul 20, 02:45 UTC1h 15m
2026-07-19 JAL541 - Jul 19, 23:05 UTCJul 20, 00:15 UTC1h 10m
2026-07-19 JAL440 MYJ → HND Jul 19, 10:25 UTCJul 19, 11:35 UTC1h 10m
2026-07-19 JAL439 HND → MYJ Jul 19, 08:10 UTCJul 19, 09:05 UTC55m
2026-07-19 JAL224 KIX → HND Jul 19, 05:55 UTCJul 19, 06:55 UTC1h 0m
2026-07-19 JAL225 HND → KIX Jul 19, 03:55 UTCJul 19, 04:50 UTC55m
2026-07-19 JAL540 KUH → HND Jul 19, 01:20 UTCJul 19, 02:35 UTC1h 15m
2026-07-18 JAL541 - Jul 18, 23:05 UTCJul 19, 00:10 UTC1h 5m
2026-07-18 JAL464 TKS → HND Jul 18, 11:40 UTCJul 18, 12:40 UTC1h 0m
2026-07-18 JAL463 HND → TKS Jul 18, 09:50 UTCJul 18, 10:40 UTC50m
2026-07-18 JAL632 KMJ → HND Jul 18, 07:00 UTCJul 18, 08:25 UTC1h 25m
2026-07-18 JAL631 - Jul 18, 04:40 UTCJul 18, 05:55 UTC1h 15m
2026-07-18 JAL626 - Jul 18, 01:54 UTCJul 18, 03:20 UTC1h 26m
2026-07-17 JAL625 - Jul 17, 23:35 UTCJul 18, 00:50 UTC1h 15m
2026-07-17 JAL266 HIJ → HND Jul 17, 11:55 UTCJul 17, 13:00 UTC1h 5m
2026-07-17 JAL265 HND → HIJ Jul 17, 10:00 UTCJul 17, 10:55 UTC55m

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 JA331J page for operator, model, and routing details .

Mode-S 851848 frequently asked

What is Mode-S code 851848?
851848 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA331J.
Where is Mode-S 851848 registered?
Mode-S code 851848 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 851848 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 851848, octal 41214110, decimal 8,722,504.
What flights does 851848 operate?
Mode-S 851848 has broadcast 20 distinct callsigns, including JAL487, JAL474, JAL266, JAL265, JAL614.