Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

851CA8

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA347J · BOEING 737-800

Hex
851CA8
Octal
41216250
Decimal
8,723,624
Country
JP
Tail
JA347J
Type
B738
No current signal · last broadcast 20d ago
Flights observed
161
Distinct callsigns
20
Country
JP
Last broadcast
20d ago

Last known position

Most recent position reported by Mode-S 851CA8.

Country allocation

The ICAO 24-bit address 851CA8 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
JAL375 Japan Airlines 4 2026-04-28
JL2004 Japan Airlines 3 2026-04-13
JAL672 Japan Airlines 3 2026-04-26
JAL590 Japan Airlines 3 2026-04-25
JAL558 Japan Airlines 3 2026-05-06
JAL542 Japan Airlines 3 2026-05-01
JAL434 Japan Airlines 3 2026-04-27
JAL376 Japan Airlines 3 2026-04-28
JAL242 Japan Airlines 3 2026-05-04
JAL239 Japan Airlines 3 2026-05-04
JAL145 Japan Airlines 3 2026-05-06
JAL667 Japan Airlines 2 2026-04-26
JAL616 Japan Airlines 2 2026-05-05
JAL613M Japan Airlines 2 2026-05-05
JAL599 Japan Airlines 2 2026-04-25
JAL567 Japan Airlines 2 2026-05-03
JAL564 Japan Airlines 2 2026-05-03
JAL557 Japan Airlines 2 2026-05-06
JAL552 Japan Airlines 2 2026-05-03
JAL551 Japan Airlines 2 2026-05-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-09 JAL4122 HND → NRT May 9, 12:30 UTCMay 9, 12:50 UTC20m
2026-05-09 JAL674 OIT → HND May 9, 10:25 UTCMay 9, 11:25 UTC1h 0m
2026-05-09 JAL669 HND → OIT May 9, 08:00 UTCMay 9, 09:15 UTC1h 15m
2026-05-09 JAL436 MYJ → HND May 9, 05:40 UTCMay 9, 06:50 UTC1h 10m
2026-05-09 JAL435 HND → MYJ May 9, 03:30 UTCMay 9, 04:35 UTC1h 5m
2026-05-09 JAL476 TAK → HND May 9, 01:00 UTCMay 9, 01:50 UTC50m
2026-05-08 JAL475 HND → TAK May 8, 23:10 UTCMay 9, 00:05 UTC55m
2026-05-08 JAL544 KUH → HND May 8, 08:59 UTCMay 8, 12:39 UTC3h 40m
2026-05-08 JAL586 HKD → HND May 8, 06:25 UTCMay 8, 07:44 UTC1h 20m
2026-05-08 JAL587 HND → HKD May 8, 04:00 UTCMay 8, 05:00 UTC1h 0m
2026-05-08 JAL540 KUH → HND May 8, 01:59 UTCMay 8, 02:39 UTC40m
2026-05-07 JAL541 HND → KUH May 7, 23:05 UTCMay 7, 23:34 UTC30m
2026-05-07 JAL698 KMI → HND May 7, 10:45 UTCMay 7, 11:35 UTC50m
2026-05-07 JAL695 HND → KMI May 7, 07:40 UTCMay 7, 08:40 UTC1h 0m
2026-05-07 JAL120 ITM → HND May 7, 05:45 UTCMay 7, 06:45 UTC1h 0m
2026-05-07 JAL117 HND → ITM May 7, 03:55 UTCMay 7, 04:35 UTC40m
2026-05-07 JAL112 ITM → HND May 7, 01:40 UTCMay 7, 02:30 UTC50m
2026-05-06 JAL107 HND → ITM May 6, 23:45 UTCMay 7, 00:30 UTC45m
2026-05-06 JAL558 AKJ → HND May 6, 11:10 UTCMay 6, 12:40 UTC1h 30m
2026-05-06 JAL557 HND → AKJ May 6, 08:50 UTCMay 6, 10:01 UTC1h 10m
2026-05-06 JAL146 AOJ → HND May 6, 06:35 UTCMay 6, 07:40 UTC1h 5m
2026-05-06 JAL145 HND → AOJ May 6, 04:30 UTCMay 6, 05:30 UTC1h 0m
2026-05-06 JAL626 KMJ → HND May 6, 01:50 UTCMay 6, 03:00 UTC1h 10m
2026-05-05 JAL625 HND → KMJ May 5, 23:15 UTCMay 6, 00:40 UTC1h 25m
2026-05-05 JAL616 NGS → HND May 5, 12:25 UTCMay 5, 13:40 UTC1h 15m
2026-05-05 JAL613M HND → NGS May 5, 09:50 UTCMay 5, 11:15 UTC1h 25m
2026-05-05 JAL613M HND → NGS May 5, 06:45 UTCMay 5, 08:15 UTC1h 30m
2026-05-05 JAL609 HND → NGS May 5, 03:50 UTCMay 5, 05:15 UTC1h 25m
2026-05-04 JAL573 HND → OBO May 4, 23:15 UTCMay 5, 02:45 UTC3h 30m
2026-05-04 JAL242 OKJ → HND May 4, 11:00 UTCMay 4, 11:55 UTC55m
2026-05-04 JAL239 HND → OKJ May 4, 08:55 UTCMay 4, 09:45 UTC50m
2026-05-04 JAL482 TAK → HND May 4, 06:50 UTCMay 4, 07:55 UTC1h 5m
2026-05-04 JAL481 HND → TAK May 4, 04:55 UTCMay 4, 05:45 UTC50m
2026-05-04 JAL690 KMI → HND May 4, 02:39 UTCMay 4, 03:24 UTC45m
2026-05-03 JAL687 HND → KMI May 3, 23:39 UTCMay 4, 00:45 UTC1h 5m
2026-05-03 JAL638 KMJ → HND May 3, 12:10 UTCMay 3, 13:25 UTC1h 15m
2026-05-03 JAL637 HND → KMJ May 3, 09:25 UTCMay 3, 11:00 UTC1h 35m
2026-05-03 JAL564 MMB → HND May 3, 06:25 UTCMay 3, 08:10 UTC1h 45m
2026-05-03 JAL567 HND → MMB May 3, 03:45 UTCMay 3, 05:10 UTC1h 25m
2026-05-03 JAL552 AKJ → HND May 3, 01:00 UTCMay 3, 02:30 UTC1h 30m
2026-05-02 JAL551 HND → AKJ May 2, 22:50 UTCMay 2, 23:55 UTC1h 5m
2026-05-02 JAL616 NGS → HND May 2, 12:05 UTCMay 2, 13:25 UTC1h 20m
2026-05-02 JAL613 HND → NGS May 2, 09:30 UTCMay 2, 10:55 UTC1h 25m
2026-05-02 JAL612 NGS → HND May 2, 06:45 UTCMay 2, 08:20 UTC1h 35m
2026-05-02 JL609 HND → NGS May 2, 04:10 UTCMay 2, 05:35 UTC1h 25m
2026-05-02 JAL608 NGS → HND May 2, 01:35 UTCMay 2, 03:00 UTC1h 25m
2026-05-01 JAL605 HND → NGS May 1, 23:00 UTCMay 2, 00:25 UTC1h 25m
2026-05-01 JAL566 MMB → HND May 1, 11:10 UTCMay 1, 13:00 UTC1h 50m
2026-05-01 JAL569 HND → MMB May 1, 09:00 UTCMay 1, 10:15 UTC1h 15m
2026-05-01 JAL542 KUH → HND May 1, 03:35 UTCMay 1, 07:45 UTC4h 10m

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 JA347J page for operator, model, and routing details .

Mode-S 851CA8 frequently asked

What is Mode-S code 851CA8?
851CA8 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA347J.
Where is Mode-S 851CA8 registered?
Mode-S code 851CA8 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 851CA8 broadcasting right now?
No active broadcast right now. Last signal was 20d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 851CA8, octal 41216250, decimal 8,723,624.
What flights does 851CA8 operate?
Mode-S 851CA8 has broadcast 20 distinct callsigns, including JAL375, JL2004, JAL672, JAL590, JAL558.