Apparatus

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sensors Mode-S transponder

851BDC

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA341J · BOEING 737-800

Hex
851BDC
Octal
41215734
Decimal
8,723,420
Country
JP
Tail
JA341J
Type
B738
Broadcasting now · callsign JAL665 · 11,275 ft
Flights observed
266
Distinct callsigns
20
Country
JP
Last broadcast
2h ago

Current position

851BDC is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 851BDC 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
JAL242 Japan Airlines 7 2026-04-26
JAL239 Japan Airlines 7 2026-04-26
JAL234 Japan Airlines 6 2026-05-09
JAL231 Japan Airlines 6 2026-05-08
JAL120 Japan Airlines 6 2026-05-22
JAL117 Japan Airlines 6 2026-05-22
JAL652 Japan Airlines 5 2026-05-22
JAL651 Japan Airlines 5 2026-05-22
JAL542 Japan Airlines 5 2026-05-09
JAL482 Japan Airlines 5 2026-05-27
JAL481 Japan Airlines 5 2026-05-27
JAL2004 Japan Airlines 5 2026-05-17
JAL112 Japan Airlines 5 2026-05-22
JAL107 Japan Airlines 5 2026-05-22
JAL647 Japan Airlines 4 2026-05-21
JAL566 Japan Airlines 4 2026-05-24
JAL509 Japan Airlines 4 2026-05-17
JAL461 Japan Airlines 4 2026-05-16
JAL2009 Japan Airlines 4 2026-05-17
JAL151 Japan Airlines 4 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 JAL562 MMB → HND May 30, 00:25 UTCMay 30, 02:00 UTC1h 35m
2026-05-29 JAL565 HND → MMB May 29, 22:05 UTCMay 29, 23:20 UTC1h 15m
2026-05-29 JAL638 KMJ → HND May 29, 12:20 UTCMay 29, 13:15 UTC55m
2026-05-29 JAL637 HND → KMJ May 29, 09:25 UTCMay 29, 10:55 UTC1h 30m
2026-05-29 JAL612 NGS → HND May 29, 07:00 UTCMay 29, 08:15 UTC1h 15m
2026-05-29 JAL609 HND → NGS May 29, 04:25 UTCMay 29, 05:50 UTC1h 25m
2026-05-29 JAL374 KKJ → HND May 29, 01:40 UTCMay 29, 02:45 UTC1h 5m
2026-05-28 JAL373 HND → KKJ May 28, 23:20 UTCMay 29, 00:25 UTC1h 5m
2026-05-28 JAL922 OKA → HND May 28, 08:15 UTCMay 28, 14:10 UTC5h 55m
2026-05-27 JAL482 TAK → HND May 27, 06:25 UTCMay 27, 07:30 UTC1h 6m
2026-05-27 JAL481 HND → TAK May 27, 04:19 UTCMay 27, 05:14 UTC55m
2026-05-27 JAL186 KIX → HND May 27, 02:24 UTCMay 27, 03:20 UTC55m
2026-05-27 JAL185 HND → KMQ May 27, 00:49 UTCMay 27, 01:24 UTC35m
2026-05-26 JAL232 OKJ → HND May 26, 22:29 UTCMay 26, 22:59 UTC30m
2026-05-26 JAL241 HND → OKJ May 26, 11:00 UTCMay 26, 11:50 UTC50m
2026-05-26 JAL240 OKJ → HND May 26, 08:34 UTCMay 26, 09:29 UTC55m
2026-05-26 JAL237 HND → OKJ May 26, 05:45 UTCMay 26, 06:34 UTC50m
2026-05-26 JAL236 OKJ → HND May 26, 03:35 UTCMay 26, 04:30 UTC55m
2026-05-26 JAL233 HND → OKJ May 26, 01:40 UTCMay 26, 02:35 UTC55m
2026-05-25 JAL662 OIT → HND May 25, 22:49 UTCMay 25, 23:54 UTC1h 5m
2026-05-25 JAL671 HND → OIT May 25, 12:05 UTCMay 25, 13:00 UTC55m
2026-05-25 JAL148 AOJ → HND May 25, 09:40 UTCMay 25, 10:50 UTC1h 10m
2026-05-25 JAL147 HND → AOJ May 25, 07:35 UTCMay 25, 08:25 UTC50m
2026-05-25 JAL214 SHM → HND May 25, 05:15 UTCMay 25, 05:55 UTC40m
2026-05-25 JAL215 HND → SHM May 25, 02:55 UTCMay 25, 03:25 UTC30m
2026-05-24 JAL431 HND → MYJ May 24, 23:00 UTCMay 24, 23:10 UTC10m
2026-05-24 JAL566 MMB → HND May 24, 11:05 UTCMay 24, 12:35 UTC1h 30m
2026-05-24 JAL569 HND → MMB May 24, 08:45 UTCMay 24, 10:10 UTC1h 25m
2026-05-24 JAL586 HKD → HND May 24, 06:15 UTCMay 24, 07:20 UTC1h 5m
2026-05-24 JAL587 HND → HKD May 24, 04:10 UTCMay 24, 05:10 UTC1h 0m
2026-05-24 JAL374 KKJ → HND May 24, 01:40 UTCMay 24, 02:45 UTC1h 5m
2026-05-23 JAL373 HND → KKJ May 23, 23:15 UTCMay 24, 00:25 UTC1h 10m
2026-05-23 JAL134 ITM → HND May 23, 11:00 UTCMay 23, 11:50 UTC50m
2026-05-23 JAL131 HND → ITM May 23, 09:05 UTCMay 23, 09:50 UTC45m
2026-05-23 JAL659 HND → ASJ May 23, 03:05 UTCMay 23, 07:25 UTC4h 20m
2026-05-23 JAL642 KOJ → HND May 23, 00:15 UTCMay 23, 01:25 UTC1h 10m
2026-05-22 JAL641 HND → KOJ May 22, 21:55 UTCMay 22, 23:00 UTC1h 5m
2026-05-22 JAL652 KOJ → HND May 22, 10:45 UTCMay 22, 11:50 UTC1h 5m
2026-05-22 JAL651 HND → KOJ May 22, 08:00 UTCMay 22, 09:00 UTC1h 0m
2026-05-22 JAL120 ITM → HND May 22, 06:00 UTCMay 22, 06:50 UTC50m
2026-05-22 JAL117 HND → ITM May 22, 03:55 UTCMay 22, 04:45 UTC50m
2026-05-22 JAL112 ITM → HND May 22, 01:50 UTCMay 22, 02:35 UTC45m
2026-05-22 JAL107 HND → ITM May 22, 00:05 UTCMay 22, 00:50 UTC45m
2026-05-21 JAL544 KUH → HND May 21, 09:05 UTCMay 21, 12:45 UTC3h 40m
2026-05-21 JAL647 HND → KOJ May 21, 03:25 UTCMay 21, 07:35 UTC4h 10m
2026-05-21 JAL492 KCZ → HND May 21, 01:00 UTCMay 21, 01:55 UTC55m
2026-05-20 JAL491 HND → KCZ May 20, 22:50 UTCMay 20, 23:35 UTC45m
2026-05-20 JAL545 HND → KUH May 20, 08:40 UTCMay 20, 12:20 UTC3h 40m
2026-05-20 JAL586 HKD → HND May 20, 06:15 UTCMay 20, 07:25 UTC1h 10m
2026-05-20 JAL587 HND → HKD May 20, 04:15 UTCMay 20, 05:15 UTC1h 1m

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 JA341J page for operator, model, and routing details .

Mode-S 851BDC frequently asked

What is Mode-S code 851BDC?
851BDC is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA341J.
Where is Mode-S 851BDC registered?
Mode-S code 851BDC is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 851BDC broadcasting right now?
Yes. Mode-S 851BDC is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 851BDC, octal 41215734, decimal 8,723,420.
What flights does 851BDC operate?
Mode-S 851BDC has broadcast 20 distinct callsigns, including JAL242, JAL239, JAL234, JAL231, JAL120.