Apparatus

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sensors Mode-S transponder

851BBA

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA340J · BOEING 737-800

Hex
851BBA
Octal
41215672
Decimal
8,723,386
Country
JP
Tail
JA340J
Type
B738
No current signal · last broadcast Jul 26, 14:10 UTC
Flights observed
600
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 14:10 UTC

Last known position

Most recent position reported by Mode-S 851BBA.

Country allocation

The ICAO 24-bit address 851BBA 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
JAL542 Japan Airlines 7 2026-07-20
JAL540 - 7 2026-07-10
JAL482 Japan Airlines 7 2026-07-21
JAL481 Japan Airlines 7 2026-07-21
JAL638 Japan Airlines 6 2026-07-21
JAL637 Japan Airlines 6 2026-07-21
JAL626 - 6 2026-07-15
JAL625 - 6 2026-07-14
JAL440 - 6 2026-07-10
JAL439 - 6 2026-07-10
JAL225 - 6 2026-07-10
JAL668 Japan Airlines 5 2026-07-26
JAL663 Japan Airlines 5 2026-07-26
JAL572 Japan Airlines 5 2026-07-23
JAL545 - 5 2026-06-17
JAL543 Japan Airlines 5 2026-07-20
JAL541 - 5 2026-07-09
JAL486 Japan Airlines 5 2026-07-26
JAL485 Japan Airlines 5 2026-07-26
JAL3118 Japan Airlines 5 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JAL486 TAK → HND Jul 26, 13:10 UTCJul 26, 14:05 UTC55m
2026-07-26 JAL485 HND → TAK Jul 26, 11:15 UTCJul 26, 12:05 UTC50m
2026-07-26 JAL262 HIJ → HND Jul 26, 08:40 UTCJul 26, 09:55 UTC1h 15m
2026-07-26 JAL263 HND → HIJ Jul 26, 06:30 UTCJul 26, 07:30 UTC1h 1m
2026-07-26 JAL668 OIT → HND Jul 26, 03:25 UTCJul 26, 04:55 UTC1h 30m
2026-07-26 JAL663 HND → OIT Jul 26, 01:10 UTCJul 26, 02:10 UTC1h 0m
2026-07-25 JAL202 NGO → HND Jul 25, 23:00 UTCJul 25, 23:40 UTC40m
2026-07-25 JAL3118 CTS → NGO Jul 25, 11:40 UTCJul 25, 12:55 UTC1h 15m
2026-07-25 JAL3117 NGO → CTS Jul 25, 09:20 UTCJul 25, 10:40 UTC1h 20m
2026-07-25 JAL3114 CTS → NGO Jul 25, 06:45 UTCJul 25, 08:00 UTC1h 15m
2026-07-25 JAL3107 NGO → CTS Jul 25, 04:20 UTCJul 25, 05:40 UTC1h 20m
2026-07-25 JAL3106 CTS → NGO Jul 25, 01:45 UTCJul 25, 03:00 UTC1h 15m
2026-07-24 JAL2001 ITM → CTS Jul 24, 23:05 UTCJul 25, 00:40 UTC1h 35m
2026-07-24 JAL3009 NRT → ITM Jul 24, 10:05 UTCJul 24, 11:00 UTC55m
2026-07-24 JAL3006 ITM → NRT Jul 24, 06:00 UTCJul 24, 07:10 UTC1h 10m
2026-07-24 JAL2004 CTS → ITM Jul 24, 03:25 UTCJul 24, 05:05 UTC1h 40m
2026-07-24 JAL509 HND → CTS Jul 24, 01:05 UTCJul 24, 02:20 UTC1h 15m
2026-07-23 JAL140 AOJ → HND Jul 23, 22:55 UTCJul 23, 23:45 UTC50m
2026-07-23 JAL151 HND → AOJ Jul 23, 11:30 UTCJul 23, 12:25 UTC55m
2026-07-23 JAL462 TKS → HND Jul 23, 09:15 UTCJul 23, 10:20 UTC1h 5m
2026-07-23 JAL461 HND → TKS Jul 23, 07:25 UTCJul 23, 08:15 UTC50m
2026-07-23 JAL572 OBO → HND Jul 23, 05:00 UTCJul 23, 06:20 UTC1h 20m
2026-07-23 JAL575 HND → OBO Jul 23, 02:35 UTCJul 23, 03:45 UTC1h 10m
2026-07-23 JAL624 KMJ → HND Jul 23, 00:00 UTCJul 23, 01:10 UTC1h 10m
2026-07-22 JAL623 HND → KMJ Jul 22, 21:40 UTCJul 22, 22:55 UTC1h 15m
2026-07-21 JAL638 KMJ → HND Jul 21, 11:20 UTCJul 21, 12:50 UTC1h 30m
2026-07-21 JAL637 HND → KMJ Jul 21, 09:00 UTCJul 21, 10:20 UTC1h 20m
2026-07-21 JAL482 TAK → HND Jul 21, 06:25 UTCJul 21, 07:30 UTC1h 5m
2026-07-21 JAL481 HND → TAK Jul 21, 04:40 UTCJul 21, 05:30 UTC50m
2026-07-21 JAL690 KMI → HND Jul 21, 01:55 UTCJul 21, 03:05 UTC1h 10m
2026-07-20 JAL687 - Jul 20, 23:30 UTCJul 21, 00:25 UTC54m
2026-07-20 JAL566 - Jul 20, 11:10 UTCJul 20, 12:35 UTC1h 25m
2026-07-20 JAL569 HND → MMB Jul 20, 08:45 UTCJul 20, 10:10 UTC1h 25m
2026-07-20 JAL542 KUH → HND Jul 20, 06:10 UTCJul 20, 07:25 UTC1h 15m
2026-07-20 JAL543 HND → KUH Jul 20, 03:25 UTCJul 20, 04:30 UTC1h 5m
2026-07-20 JAL112 ITM → HND Jul 20, 01:25 UTCJul 20, 02:15 UTC50m
2026-07-19 JAL107 HND → ITM Jul 19, 23:40 UTCJul 20, 00:25 UTC45m
2026-07-19 JAL652 - Jul 19, 10:50 UTCJul 19, 12:00 UTC1h 10m
2026-07-19 JAL651 HND → KOJ Jul 19, 08:15 UTCJul 19, 09:20 UTC1h 5m
2026-07-19 JAL436 - Jul 19, 05:40 UTCJul 19, 07:00 UTC1h 20m
2026-07-19 JAL435 - Jul 19, 03:35 UTCJul 19, 04:30 UTC55m
2026-07-19 JAL234 - Jul 19, 01:15 UTCJul 19, 02:15 UTC1h 0m
2026-07-18 JAL231 - Jul 18, 23:25 UTCJul 19, 00:10 UTC45m
2026-07-18 JAL638 KMJ → HND Jul 18, 11:10 UTCJul 18, 12:30 UTC1h 20m
2026-07-18 JAL637 - Jul 18, 08:55 UTCJul 18, 10:15 UTC1h 20m
2026-07-18 JAL146 - Jul 18, 06:40 UTCJul 18, 07:30 UTC50m
2026-07-18 JAL145 - Jul 18, 04:40 UTCJul 18, 05:35 UTC55m
2026-07-18 JAL374 - Jul 18, 01:45 UTCJul 18, 03:00 UTC1h 16m
2026-07-17 JAL373C - Jul 17, 23:39 UTCJul 18, 00:45 UTC1h 5m
2026-07-17 JAL652 - Jul 17, 10:25 UTCJul 17, 11:35 UTC1h 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 JA340J page for operator, model, and routing details .

Mode-S 851BBA frequently asked

What is Mode-S code 851BBA?
851BBA is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA340J.
Where is Mode-S 851BBA registered?
Mode-S code 851BBA is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 851BBA broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 851BBA, octal 41215672, decimal 8,723,386.
What flights does 851BBA operate?
Mode-S 851BBA has broadcast 20 distinct callsigns, including JAL542, JAL540, JAL482, JAL481, JAL638.