Apparatus

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sensors Mode-S transponder

851936

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA338J · BOEING 737-800

Hex
851936
Octal
41214466
Decimal
8,722,742
Country
JP
Tail
JA338J
Type
B738
No current signal · last broadcast Jul 26, 13:45 UTC
Flights observed
631
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 13:45 UTC

Last known position

Most recent position reported by Mode-S 851936.

Country allocation

The ICAO 24-bit address 851936 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
JAL486 Japan Airlines 7 2026-07-25
JAL480 - 7 2026-07-16
JAL438 - 7 2026-07-16
JAL437 - 7 2026-07-16
JAL209 - 7 2026-07-16
JAL572 Japan Airlines 6 2026-07-22
JAL485 Japan Airlines 6 2026-07-25
JAL479 - 6 2026-07-16
JAL3406 - 6 2026-06-22
JAL629 Japan Airlines 5 2026-07-20
JAL624 Japan Airlines 5 2026-07-22
JAL623 Japan Airlines 5 2026-07-21
JAL520 - 5 2026-06-21
JAL509 Japan Airlines 5 2026-07-23
JAL482 - 5 2026-07-15
JAL481 - 5 2026-07-15
JAL465 - 5 2026-06-21
JAL462 - 5 2026-06-25
JAL461 - 5 2026-06-25
JAL452 - 5 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JAL464 TKS → HND Jul 26, 12:45 UTCJul 26, 13:40 UTC55m
2026-07-26 JAL463 HND → TKS Jul 26, 11:00 UTCJul 26, 11:45 UTC45m
2026-07-26 JAL632 KMJ → HND Jul 26, 08:05 UTCJul 26, 09:25 UTC1h 20m
2026-07-26 JAL631 HND → KMJ Jul 26, 05:15 UTCJul 26, 06:30 UTC1h 15m
2026-07-26 JAL626 KMJ → HND Jul 26, 01:55 UTCJul 26, 03:15 UTC1h 20m
2026-07-25 JAL625 HND → KMJ Jul 25, 23:35 UTCJul 26, 00:50 UTC1h 15m
2026-07-25 JAL486 TAK → HND Jul 25, 12:40 UTCJul 25, 13:35 UTC55m
2026-07-25 JAL485 HND → TAK Jul 25, 10:45 UTCJul 25, 11:40 UTC55m
2026-07-25 JAL262 HIJ → HND Jul 25, 08:15 UTCJul 25, 09:20 UTC1h 5m
2026-07-25 JAL263 HND → HIJ Jul 25, 05:45 UTCJul 25, 06:45 UTC1h 0m
2026-07-25 JAL668 OIT → HND Jul 25, 03:20 UTCJul 25, 04:35 UTC1h 15m
2026-07-25 JAL663 HND → OIT Jul 25, 01:10 UTCJul 25, 02:15 UTC1h 5m
2026-07-24 JAL202 NGO → HND Jul 24, 23:00 UTCJul 24, 23:35 UTC35m
2026-07-24 JAL3118 CTS → NGO Jul 24, 11:15 UTCJul 24, 12:30 UTC1h 15m
2026-07-24 JAL3117 NGO → CTS Jul 24, 08:55 UTCJul 24, 10:20 UTC1h 25m
2026-07-24 JAL3114 CTS → NGO Jul 24, 06:35 UTCJul 24, 07:45 UTC1h 10m
2026-07-24 JAL3107 NGO → CTS Jul 24, 03:55 UTCJul 24, 05:20 UTC1h 25m
2026-07-24 JAL3106 CTS → NGO Jul 24, 01:35 UTCJul 24, 02:45 UTC1h 10m
2026-07-23 JAL2001 ITM → CTS Jul 23, 22:55 UTCJul 24, 00:30 UTC1h 35m
2026-07-23 JAL3009 NRT → ITM Jul 23, 10:00 UTCJul 23, 10:50 UTC50m
2026-07-23 JAL3006 ITM → NRT Jul 23, 06:05 UTCJul 23, 07:15 UTC1h 10m
2026-07-23 JAL2004 CTS → ITM Jul 23, 03:25 UTCJul 23, 05:00 UTC1h 35m
2026-07-23 JAL509 HND → CTS Jul 23, 01:05 UTCJul 23, 02:15 UTC1h 10m
2026-07-22 JAL140 AOJ → HND Jul 22, 22:50 UTCJul 22, 23:45 UTC55m
2026-07-22 JAL151 HND → AOJ Jul 22, 11:10 UTCJul 22, 12:10 UTC1h 0m
2026-07-22 JAL572 OBO → HND Jul 22, 04:50 UTCJul 22, 05:10 UTC20m
2026-07-22 JAL575 HND → OBO Jul 22, 02:40 UTCJul 22, 03:40 UTC1h 0m
2026-07-22 JAL624 KMJ → HND Jul 22, 00:10 UTCJul 22, 01:35 UTC1h 25m
2026-07-21 JAL623 HND → KMJ Jul 21, 21:40 UTCJul 21, 23:00 UTC1h 20m
2026-07-21 JAL228 KIX → HND Jul 21, 12:20 UTCJul 21, 13:10 UTC50m
2026-07-21 JAL2506 CTS → KIX Jul 21, 09:20 UTCJul 21, 11:15 UTC1h 55m
2026-07-21 JAL2505 KIX → CTS Jul 21, 06:30 UTCJul 21, 08:05 UTC1h 35m
2026-07-21 JAL2504 CTS → KIX Jul 21, 03:15 UTCJul 21, 05:05 UTC1h 50m
2026-07-21 JAL2501 KIX → CTS Jul 21, 00:45 UTCJul 21, 02:10 UTC1h 25m
2026-07-20 JAL221 HND → KIX Jul 20, 22:35 UTCJul 20, 23:25 UTC50m
2026-07-20 JAL698 - Jul 20, 10:25 UTCJul 20, 11:40 UTC1h 15m
2026-07-20 JAL695 HND → KMI Jul 20, 08:00 UTCJul 20, 09:00 UTC1h 0m
2026-07-20 JAL630 KMJ → HND Jul 20, 05:25 UTCJul 20, 06:45 UTC1h 20m
2026-07-20 JAL629 HND → KMJ Jul 20, 02:50 UTCJul 20, 04:05 UTC1h 15m
2026-07-20 JAL642 KOJ → HND Jul 20, 00:25 UTCJul 20, 01:35 UTC1h 10m
2026-07-19 JAL641 HND → KOJ Jul 19, 21:50 UTCJul 19, 22:55 UTC1h 5m
2026-07-19 JAL486 - Jul 19, 11:50 UTCJul 19, 13:00 UTC1h 10m
2026-07-19 JAL485 HND → TAK Jul 19, 10:00 UTCJul 19, 10:50 UTC50m
2026-07-19 JAL262 HIJ → HND Jul 19, 07:30 UTCJul 19, 08:55 UTC1h 25m
2026-07-19 JAL263 HND → HIJ Jul 19, 05:35 UTCJul 19, 06:30 UTC55m
2026-07-19 JAL668 OIT → HND Jul 19, 03:20 UTCJul 19, 04:25 UTC1h 5m
2026-07-19 JAL663 - Jul 19, 01:15 UTCJul 19, 02:15 UTC1h 0m
2026-07-18 JAL202 - Jul 18, 23:05 UTCJul 18, 23:40 UTC35m
2026-07-18 JAL3118 - Jul 18, 11:25 UTCJul 18, 12:40 UTC1h 15m
2026-07-18 JAL3117 - Jul 18, 09:00 UTCJul 18, 10:30 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 JA338J page for operator, model, and routing details .

Mode-S 851936 frequently asked

What is Mode-S code 851936?
851936 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA338J.
Where is Mode-S 851936 registered?
Mode-S code 851936 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 851936 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 13:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 851936, octal 41214466, decimal 8,722,742.
What flights does 851936 operate?
Mode-S 851936 has broadcast 20 distinct callsigns, including JAL486, JAL480, JAL438, JAL437, JAL209.