Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

851958

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA339J · BOEING 737-800

Hex
851958
Octal
41214530
Decimal
8,722,776
Country
JP
Tail
JA339J
Type
B738
Broadcasting now · callsign JAL164 · 28,000 ft
Flights observed
568
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 14:00 UTC

Current position

851958 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 851958 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
JAL2505 - 7 2026-07-07
JAL2501 - 7 2026-07-07
JAL587 - 6 2026-06-30
JAL586 - 6 2026-06-30
JAL545 - 6 2026-07-15
JAL3118 - 6 2026-07-09
JAL3117 - 6 2026-07-09
JAL3114 - 6 2026-07-09
JAL3107 - 6 2026-07-09
JAL3106 - 6 2026-07-09
JAL3009 - 6 2026-07-08
JAL3006 - 6 2026-07-08
JAL2504 - 6 2026-07-07
JAL2465 - 6 2026-07-08
JAL221 - 6 2026-07-06
JAL202 - 6 2026-07-09
JAL2001 - 6 2026-07-08
JAL544 - 5 2026-07-15
JAL495 Japan Airlines 5 2026-07-22
JAL439 - 5 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JAL150 AOJ → HND Jul 26, 12:50 UTCJul 26, 13:50 UTC1h 0m
2026-07-26 JAL149 HND → AOJ Jul 26, 11:05 UTCJul 26, 12:00 UTC55m
2026-07-26 JAL614 NGS → HND Jul 26, 08:20 UTCJul 26, 09:50 UTC1h 30m
2026-07-26 JAL611 HND → NGS Jul 26, 05:40 UTCJul 26, 07:05 UTC1h 26m
2026-07-26 JAL494 KCZ → HND Jul 26, 02:45 UTCJul 26, 03:40 UTC55m
2026-07-26 JAL493 HND → KCZ Jul 26, 00:35 UTCJul 26, 01:15 UTC40m
2026-07-25 JAL490 KCZ → HND Jul 25, 22:35 UTCJul 25, 23:30 UTC55m
2026-07-25 JAL499 HND → KCZ Jul 25, 10:45 UTCJul 25, 11:30 UTC45m
2026-07-25 JAL574 OBO → HND Jul 25, 08:25 UTCJul 25, 09:35 UTC1h 10m
2026-07-25 JAL577 HND → OBO Jul 25, 05:20 UTCJul 25, 06:20 UTC1h 0m
2026-07-25 JAL434 MYJ → HND Jul 25, 02:50 UTCJul 25, 04:10 UTC1h 20m
2026-07-25 JAL433 HND → MYJ Jul 25, 00:50 UTCJul 25, 01:50 UTC1h 0m
2026-07-24 JAL430 MYJ → HND Jul 24, 22:25 UTCJul 24, 23:30 UTC1h 5m
2026-07-24 JAL443 HND → MYJ Jul 24, 12:00 UTCJul 24, 12:55 UTC55m
2026-07-24 JAL672 OIT → HND Jul 24, 09:30 UTCJul 24, 11:00 UTC1h 30m
2026-07-24 JAL667 HND → OIT Jul 24, 06:35 UTCJul 24, 07:35 UTC1h 0m
2026-07-24 JAL456 TKS → HND Jul 24, 03:35 UTCJul 24, 04:35 UTC1h 0m
2026-07-24 JAL455B - Jul 24, 01:45 UTCJul 24, 02:35 UTC50m
2026-07-23 JAL662M - Jul 23, 23:00 UTCJul 24, 00:15 UTC1h 15m
2026-07-23 JAL671 HND → OIT Jul 23, 11:30 UTCJul 23, 12:35 UTC1h 5m
2026-07-23 JAL148 AOJ → HND Jul 23, 09:25 UTCJul 23, 10:15 UTC50m
2026-07-23 JAL147 HND → AOJ Jul 23, 07:25 UTCJul 23, 08:00 UTC35m
2026-07-23 JAL214 SHM → HND Jul 23, 05:10 UTCJul 23, 05:50 UTC40m
2026-07-23 JAL215 HND → SHM Jul 23, 02:55 UTCJul 23, 03:25 UTC30m
2026-07-23 JAL254 HIJ → HND Jul 23, 00:30 UTCJul 23, 01:35 UTC1h 5m
2026-07-22 JAL253 HND → HIJ Jul 22, 22:40 UTCJul 22, 23:35 UTC55m
2026-07-22 JAL378 KKJ → HND Jul 22, 12:20 UTCJul 22, 13:35 UTC1h 15m
2026-07-22 JAL377 HND → KKJ Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 JAL495 HND → KCZ Jul 22, 05:20 UTCJul 22, 05:25 UTC5m
2026-07-22 JAL144 AOJ → HND Jul 22, 03:15 UTCJul 22, 04:10 UTC55m
2026-07-22 JAL143 HND → AOJ Jul 22, 01:25 UTCJul 22, 02:20 UTC55m
2026-07-21 JAL606 NGS → HND Jul 21, 22:30 UTCJul 22, 00:10 UTC1h 40m
2026-07-21 JAL615V - Jul 21, 10:55 UTCJul 21, 12:20 UTC1h 25m
2026-07-21 JAL484 TAK → HND Jul 21, 08:40 UTCJul 21, 09:45 UTC1h 5m
2026-07-21 JAL483 HND → TAK Jul 21, 06:35 UTCJul 21, 07:25 UTC50m
2026-07-21 JAL610 NGS → HND Jul 21, 03:50 UTCJul 21, 05:20 UTC1h 30m
2026-07-21 JAL607 HND → NGS Jul 21, 01:25 UTCJul 21, 02:50 UTC1h 25m
2026-07-20 JAL590 CTS → HND Jul 20, 22:50 UTCJul 21, 00:05 UTC1h 15m
2026-07-20 JAL599 HND → CTS Jul 20, 11:45 UTCJul 20, 12:55 UTC1h 10m
2026-07-20 JAL264 - Jul 20, 09:15 UTCJul 20, 10:25 UTC1h 10m
2026-07-20 JAL3406 CTS → HIJ Jul 20, 06:20 UTCJul 20, 08:05 UTC1h 45m
2026-07-20 JAL3513 FUK → CTS Jul 20, 03:05 UTCJul 20, 05:00 UTC1h 55m
2026-07-20 JAL309 - Jul 20, 00:25 UTCJul 20, 01:30 UTC1h 5m
2026-07-19 JAL452 TKS → HND Jul 19, 22:20 UTCJul 19, 23:20 UTC1h 0m
2026-07-19 JAL465 HND → TKS Jul 19, 11:25 UTCJul 19, 12:15 UTC50m
2026-07-19 JAL520 - Jul 19, 08:45 UTCJul 19, 10:10 UTC1h 25m
2026-07-19 JAL3515 - Jul 19, 05:30 UTCJul 19, 07:35 UTC2h 5m
2026-07-19 JAL3510 CTS → FUK Jul 19, 01:55 UTCJul 19, 03:50 UTC1h 55m
2026-07-18 JAL3101 NGO → CTS Jul 18, 23:25 UTCJul 19, 00:45 UTC1h 20m
2026-07-18 JAL209 - Jul 18, 11:30 UTCJul 18, 12:00 UTC30m

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 JA339J page for operator, model, and routing details .

Mode-S 851958 frequently asked

What is Mode-S code 851958?
851958 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA339J.
Where is Mode-S 851958 registered?
Mode-S code 851958 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 851958 broadcasting right now?
Yes. Mode-S 851958 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 851958, octal 41214530, decimal 8,722,776.
What flights does 851958 operate?
Mode-S 851958 has broadcast 20 distinct callsigns, including JAL2505, JAL2501, JAL587, JAL586, JAL545.