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
Transponder active on ground
Flights observed
527
Distinct callsigns
20
Country
JP
Last broadcast
59m ago

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
JAL575 - 6 2026-06-21
JAL572 - 6 2026-06-21
JAL462 - 6 2026-06-21
JAL234 Japan Airlines 6 2026-05-09
JAL231 Japan Airlines 6 2026-05-08
JAL2009 - 6 2026-07-08
JAL2004 - 6 2026-07-08
JAL647 Japan Airlines 5 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 JAL659 - Jul 15, 02:55 UTCJul 15, 07:00 UTC4h 5m
2026-07-15 JAL212 - Jul 15, 00:55 UTCJul 15, 01:40 UTC45m
2026-07-14 JAL213 - Jul 14, 23:00 UTCJul 14, 23:30 UTC30m
2026-07-14 JAL652 HND → HND Jul 14, 07:45 UTCJul 14, 11:55 UTC4h 10m
2026-07-14 JAL120 - Jul 14, 05:45 UTCJul 14, 06:35 UTC50m
2026-07-14 JAL117 HND → ITM Jul 14, 03:55 UTCJul 14, 04:35 UTC40m
2026-07-14 JAL112 - Jul 14, 01:45 UTCJul 14, 02:35 UTC50m
2026-07-13 JAL107 HND → ITM Jul 13, 23:50 UTCJul 14, 00:30 UTC40m
2026-07-13 JAL378 - Jul 13, 12:35 UTCJul 13, 13:50 UTC1h 15m
2026-07-13 JAL377 - Jul 13, 10:00 UTCJul 13, 11:05 UTC1h 5m
2026-07-13 JAL496 - Jul 13, 07:40 UTCJul 13, 09:00 UTC1h 20m
2026-07-13 JAL495 - Jul 13, 05:31 UTCJul 13, 06:10 UTC40m
2026-07-13 JAL144 - Jul 13, 03:15 UTCJul 13, 04:10 UTC55m
2026-07-13 JAL143 - Jul 13, 01:25 UTCJul 13, 02:20 UTC55m
2026-07-12 JAL606 - Jul 12, 22:30 UTCJul 13, 00:05 UTC1h 35m
2026-07-12 JAL615V - Jul 12, 11:01 UTCJul 12, 12:20 UTC1h 20m
2026-07-12 JAL484 - Jul 12, 08:30 UTCJul 12, 09:45 UTC1h 15m
2026-07-12 JAL483 - Jul 12, 06:35 UTCJul 12, 07:25 UTC50m
2026-07-12 JAL610 - Jul 12, 03:50 UTCJul 12, 05:15 UTC1h 25m
2026-07-12 JAL607 - Jul 12, 01:30 UTCJul 12, 02:50 UTC1h 20m
2026-07-11 JAL590 - Jul 11, 22:45 UTCJul 12, 00:01 UTC1h 15m
2026-07-11 JAL599 - Jul 11, 11:50 UTCJul 11, 13:10 UTC1h 20m
2026-07-11 JAL264 - Jul 11, 09:25 UTCJul 11, 10:35 UTC1h 10m
2026-07-11 JAL3406 - Jul 11, 06:50 UTCJul 11, 08:30 UTC1h 40m
2026-07-11 JAL3513 - Jul 11, 03:05 UTCJul 11, 05:10 UTC2h 5m
2026-07-11 JAL309 - Jul 11, 00:25 UTCJul 11, 01:25 UTC1h 0m
2026-07-10 JAL452 - Jul 10, 22:15 UTCJul 10, 23:15 UTC1h 0m
2026-07-10 JAL465 - Jul 10, 11:10 UTCJul 10, 11:55 UTC45m
2026-07-10 JAL520 - Jul 10, 08:45 UTCJul 10, 10:00 UTC1h 15m
2026-07-10 JAL3515 - Jul 10, 05:35 UTCJul 10, 07:40 UTC2h 5m
2026-07-10 JAL3510 - Jul 10, 01:50 UTCJul 10, 03:35 UTC1h 45m
2026-07-09 JAL3101 - Jul 9, 23:20 UTCJul 10, 00:40 UTC1h 20m
2026-07-09 JAL209 - Jul 9, 11:20 UTCJul 9, 11:55 UTC35m
2026-07-09 JAL438 - Jul 9, 08:50 UTCJul 9, 10:05 UTC1h 15m
2026-07-09 JAL437 - Jul 9, 06:50 UTCJul 9, 07:50 UTC1h 0m
2026-07-09 JAL480 - Jul 9, 04:30 UTCJul 9, 05:35 UTC1h 5m
2026-07-09 JAL479 - Jul 9, 02:20 UTCJul 9, 03:10 UTC50m
2026-07-08 JAL624 - Jul 8, 23:55 UTCJul 9, 01:20 UTC1h 25m
2026-07-08 JAL623 - Jul 8, 21:40 UTCJul 8, 22:55 UTC1h 15m
2026-07-08 JAL228 KIX → HND Jul 8, 12:25 UTCJul 8, 13:20 UTC55m
2026-07-08 JAL2506 CTS → KIX Jul 8, 09:10 UTCJul 8, 11:05 UTC1h 55m
2026-07-08 JAL2009 ITM → CTS Jul 8, 06:25 UTCJul 8, 07:55 UTC1h 30m
2026-07-08 JAL2004 - Jul 8, 03:20 UTCJul 8, 04:45 UTC1h 25m
2026-07-08 JAL509 - Jul 8, 01:05 UTCJul 8, 02:15 UTC1h 10m
2026-07-07 JAL140 - Jul 7, 22:50 UTCJul 7, 23:40 UTC50m
2026-07-07 JAL151 - Jul 7, 11:30 UTCJul 7, 12:20 UTC50m
2026-07-07 JAL120 - Jul 7, 06:50 UTCJul 7, 07:35 UTC45m
2026-07-07 JAL2465 - Jul 7, 02:00 UTCJul 7, 05:55 UTC3h 55m
2026-07-06 JAL2016 CTS → ITM Jul 6, 09:10 UTCJul 6, 10:50 UTC1h 40m
2026-07-06 JAL2505 - Jul 6, 06:25 UTCJul 6, 07:55 UTC1h 30m

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?
Mode-S 851BDC is currently broadcasting from the ground.
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.