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
No current signal · last broadcast Jul 26, 13:10 UTC
Flights observed
583
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 13:10 UTC

Last known position

Most recent position reported by Mode-S 851BDC.

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 8 2026-06-11
JAL239 Japan Airlines 8 2026-06-11
JAL120 - 8 2026-07-14
JAL117 - 8 2026-07-14
JAL112 - 8 2026-07-14
JAL107 - 8 2026-07-13
JAL624 - 7 2026-07-08
JAL623 - 7 2026-07-08
JAL542 - 7 2026-06-25
JAL461 - 7 2026-06-21
JAL652 - 6 2026-07-14
JAL651 - 6 2026-06-16
JAL647 Japan Airlines 6 2026-07-25
JAL575 - 6 2026-06-21
JAL572 - 6 2026-06-21
JAL566 - 6 2026-07-16
JAL462 - 6 2026-06-21
JAL234 Japan Airlines 6 2026-05-09
JAL231 Japan Airlines 6 2026-05-08
JAL2009 - 6 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JAL3919 ITM → CTS Jul 26, 11:35 UTCJul 26, 13:10 UTC1h 35m
2026-07-26 JAL2086 OKA → ITM Jul 26, 08:50 UTCJul 26, 09:10 UTC20m
2026-07-26 JAL2086 OKA → ITM Jul 26, 07:25 UTCJul 26, 07:45 UTC20m
2026-07-26 JAL2085 ITM → OKA Jul 26, 04:45 UTCJul 26, 06:20 UTC1h 35m
2026-07-26 JAL115 HND → ITM Jul 26, 02:55 UTCJul 26, 03:40 UTC45m
2026-07-26 JAL432 MYJ → HND Jul 26, 00:25 UTCJul 26, 01:35 UTC1h 10m
2026-07-25 JAL431 HND → MYJ Jul 25, 22:15 UTCJul 25, 23:10 UTC55m
2026-07-25 JAL648 KOJ → HND Jul 25, 08:35 UTCJul 25, 09:45 UTC1h 10m
2026-07-25 JAL647 HND → KOJ Jul 25, 03:25 UTCJul 25, 04:30 UTC1h 5m
2026-07-25 JAL476 TAK → HND Jul 25, 01:00 UTCJul 25, 02:05 UTC1h 5m
2026-07-24 JAL475 HND → TAK Jul 24, 23:10 UTCJul 25, 00:00 UTC50m
2026-07-24 JAL698 KMI → HND Jul 24, 07:55 UTCJul 24, 12:30 UTC4h 35m
2026-07-24 JAL630 KMJ → HND Jul 24, 05:25 UTCJul 24, 06:40 UTC1h 15m
2026-07-24 JAL629 HND → KMJ Jul 24, 02:50 UTCJul 24, 04:10 UTC1h 20m
2026-07-24 JAL642 KOJ → HND Jul 24, 00:15 UTCJul 24, 01:35 UTC1h 20m
2026-07-23 JAL641 HND → KOJ Jul 23, 21:50 UTCJul 23, 22:55 UTC1h 5m
2026-07-23 JAL378 KKJ → HND Jul 23, 12:20 UTCJul 23, 13:30 UTC1h 10m
2026-07-23 JAL377 HND → KKJ Jul 23, 10:10 UTCJul 23, 11:10 UTC1h 0m
2026-07-23 JAL496 KCZ → HND Jul 23, 07:45 UTCJul 23, 09:00 UTC1h 15m
2026-07-23 JAL495 HND → KCZ Jul 23, 05:30 UTCJul 23, 06:15 UTC45m
2026-07-23 JAL144 AOJ → HND Jul 23, 03:25 UTCJul 23, 04:15 UTC50m
2026-07-23 JAL143 HND → AOJ Jul 23, 01:30 UTCJul 23, 02:20 UTC50m
2026-07-22 JAL606 NGS → HND Jul 22, 22:35 UTCJul 23, 00:00 UTC1h 25m
2026-07-22 JAL615V - Jul 22, 11:20 UTCJul 22, 12:10 UTC50m
2026-07-22 JAL610 NGS → HND Jul 22, 03:50 UTCJul 22, 05:25 UTC1h 35m
2026-07-22 JAL607 HND → NGS Jul 22, 01:25 UTCJul 22, 02:50 UTC1h 25m
2026-07-21 JAL590 CTS → HND Jul 21, 22:50 UTCJul 22, 00:00 UTC1h 10m
2026-07-21 JAL599 HND → CTS Jul 21, 11:50 UTCJul 21, 13:00 UTC1h 10m
2026-07-21 JAL264 HIJ → HND Jul 21, 09:15 UTCJul 21, 10:30 UTC1h 15m
2026-07-21 JAL3406 CTS → HIJ Jul 21, 06:35 UTCJul 21, 08:15 UTC1h 40m
2026-07-21 JAL3513 FUK → CTS Jul 21, 03:10 UTCJul 21, 05:00 UTC1h 50m
2026-07-21 JAL309 - Jul 21, 00:20 UTCJul 21, 01:25 UTC1h 5m
2026-07-20 JAL452 TKS → HND Jul 20, 22:15 UTCJul 20, 23:10 UTC55m
2026-07-20 JAL465 HND → TKS Jul 20, 11:10 UTCJul 20, 12:00 UTC50m
2026-07-20 JAL520 - Jul 20, 08:50 UTCJul 20, 10:05 UTC1h 15m
2026-07-20 JAL3515 - Jul 20, 05:55 UTCJul 20, 07:45 UTC1h 50m
2026-07-20 JAL3510 CTS → FUK Jul 20, 01:50 UTCJul 20, 03:35 UTC1h 45m
2026-07-19 JAL3101 NGO → CTS Jul 19, 23:20 UTCJul 20, 00:35 UTC1h 15m
2026-07-19 JAL209 - Jul 19, 11:25 UTCJul 19, 12:00 UTC35m
2026-07-19 JAL438 MYJ → HND Jul 19, 08:55 UTCJul 19, 10:15 UTC1h 20m
2026-07-19 JAL437 - Jul 19, 06:40 UTCJul 19, 07:40 UTC1h 0m
2026-07-19 JAL480 - Jul 19, 04:30 UTCJul 19, 05:30 UTC1h 0m
2026-07-19 JAL479 - Jul 19, 02:45 UTCJul 19, 03:35 UTC50m
2026-07-19 JAL278 IZO → HND Jul 19, 00:30 UTCJul 19, 01:30 UTC1h 0m
2026-07-18 JAL277 HND → IZO Jul 18, 22:35 UTCJul 18, 23:20 UTC45m
2026-07-18 JAL266 HIJ → HND Jul 18, 11:45 UTCJul 18, 13:00 UTC1h 15m
2026-07-18 JAL265 HND → HIJ Jul 18, 09:50 UTCJul 18, 10:50 UTC1h 0m
2026-07-18 JAL494 - Jul 18, 04:40 UTCJul 18, 05:40 UTC1h 0m
2026-07-18 JAL493 - Jul 18, 02:35 UTCJul 18, 03:15 UTC41m
2026-07-16 JAL566 - Jul 16, 11:25 UTCJul 16, 12:49 UTC1h 25m

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?
No active broadcast right now. Last signal was Jul 26, 13:10 UTC.
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, JAL120, JAL117, JAL112.