Apparatus

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sensors Mode-S transponder

851F4E

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA350J · BOEING 737-800

Hex
851F4E
Octal
41217516
Decimal
8,724,302
Country
JP
Tail
JA350J
Type
B738
Broadcasting now · callsign JAL188 · 500 ft
Flights observed
386
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 12:45 UTC

Current position

851F4E is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 851F4E 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
JTA37 - 12 2026-07-06
JTA63 - 10 2026-07-12
JTA57 - 10 2026-07-03
JTA42 Japan Transocean Air 10 2026-07-26
JTA16 - 10 2026-07-18
JTA13 Japan Transocean Air 10 2026-07-21
JTA53 Japan Transocean Air 9 2026-07-26
JTA49 - 9 2026-07-17
JTA121 - 9 2026-07-16
JTA9 - 8 2026-07-22
JTA51 - 8 2026-07-12
JTA5 - 8 2026-07-21
JTA47 Japan Transocean Air 8 2026-07-26
JTA36 - 8 2026-07-06
JTA302 - 8 2026-07-18
JTA52 - 7 2026-07-03
JTA44 - 7 2026-07-17
JTA301 - 7 2026-07-18
JTA128 Japan Transocean Air 7 2026-07-26
JAL933 Japan Airlines 7 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JTA128 MMY → KIX Jul 26, 11:05 UTCJul 26, 12:45 UTC1h 40m
2026-07-26 JTA573 OKA → MMY Jul 26, 09:15 UTCJul 26, 09:25 UTC10m
2026-07-26 JTA47 NGO → OKA Jul 26, 06:15 UTCJul 26, 07:50 UTC1h 36m
2026-07-26 JTA42 OKA → NGO Jul 26, 03:25 UTCJul 26, 04:55 UTC1h 30m
2026-07-26 JTA53 FUK → OKA Jul 26, 01:50 UTCJul 26, 02:05 UTC15m
2026-07-26 JTA53 FUK → OKA Jul 26, 00:55 UTCJul 26, 01:05 UTC10m
2026-07-25 JTA50 OKA → FUK Jul 25, 22:30 UTCJul 25, 23:40 UTC1h 10m
2026-07-22 JTA9 - Jul 22, 12:45 UTCJul 22, 13:00 UTC15m
2026-07-22 JTA9 - Jul 22, 11:35 UTCJul 22, 12:10 UTC35m
2026-07-22 JTA8 - Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 JTA600 ISG → OKA Jul 22, 00:40 UTCJul 22, 00:50 UTC10m
2026-07-21 JTA626 ISG → OKA Jul 21, 10:35 UTCJul 21, 10:50 UTC15m
2026-07-21 JTA5 - Jul 21, 06:45 UTCJul 21, 07:00 UTC15m
2026-07-21 JTA5 - Jul 21, 05:20 UTCJul 21, 06:00 UTC40m
2026-07-21 JTA4 - Jul 21, 02:25 UTCJul 21, 04:00 UTC1h 35m
2026-07-21 JTA13 OKJ → OKA Jul 21, 01:00 UTCJul 21, 01:15 UTC15m
2026-07-20 JTA13 OKJ → OKA Jul 20, 23:40 UTCJul 21, 00:15 UTC35m
2026-07-20 JAL241 - Jul 20, 11:10 UTCJul 20, 11:55 UTC45m
2026-07-20 JAL240 OKJ → HND Jul 20, 08:40 UTCJul 20, 09:50 UTC1h 10m
2026-07-20 JAL237 - Jul 20, 05:45 UTCJul 20, 06:40 UTC55m
2026-07-20 JAL236 OKJ → HND Jul 20, 03:35 UTCJul 20, 04:35 UTC1h 0m
2026-07-20 JAL233 HND → OKJ Jul 20, 01:40 UTCJul 20, 02:30 UTC50m
2026-07-19 JAL182 KMQ → HND Jul 19, 22:50 UTCJul 19, 23:45 UTC55m
2026-07-19 JAL193 - Jul 19, 11:55 UTCJul 19, 12:35 UTC40m
2026-07-19 JAL190 - Jul 19, 09:50 UTCJul 19, 10:45 UTC55m
2026-07-19 JAL189 - Jul 19, 08:10 UTCJul 19, 08:50 UTC40m
2026-07-19 JAL188 KMQ → HND Jul 19, 05:55 UTCJul 19, 06:55 UTC1h 0m
2026-07-19 JTA187 HND → KMQ Jul 19, 04:20 UTCJul 19, 05:00 UTC40m
2026-07-19 JTA186 KMQ → HND Jul 19, 02:10 UTCJul 19, 03:00 UTC50m
2026-07-19 JAL185 - Jul 19, 00:40 UTCJul 19, 01:15 UTC35m
2026-07-18 JAL232 - Jul 18, 22:20 UTCJul 18, 23:20 UTC1h 0m
2026-07-18 JTA16 - Jul 18, 09:55 UTCJul 18, 11:20 UTC1h 25m
2026-07-18 JTA302 - Jul 18, 03:30 UTCJul 18, 03:40 UTC10m
2026-07-18 JTA302 - Jul 18, 02:35 UTCJul 18, 02:45 UTC10m
2026-07-18 JTA301 - Jul 18, 00:29 UTCJul 18, 00:45 UTC15m
2026-07-17 JTA49 - Jul 17, 09:55 UTCJul 17, 11:25 UTC1h 30m
2026-07-17 JTA44 - Jul 17, 08:15 UTCJul 17, 08:30 UTC15m
2026-07-17 JTA44 - Jul 17, 06:50 UTCJul 17, 07:05 UTC15m
2026-07-17 JTA556 - Jul 17, 02:20 UTCJul 17, 02:30 UTC10m
2026-07-16 JTA121 - Jul 16, 22:59 UTCJul 17, 00:30 UTC1h 30m
2026-07-16 JTA86 - Jul 16, 11:40 UTCJul 16, 13:15 UTC1h 35m
2026-07-16 JTA612 - Jul 16, 04:50 UTCJul 16, 05:00 UTC10m
2026-07-16 JTA83 - Jul 16, 01:15 UTCJul 16, 02:50 UTC1h 35m
2026-07-15 JTA2 - Jul 15, 22:25 UTCJul 16, 00:00 UTC1h 35m
2026-07-15 JTA626 - Jul 15, 10:20 UTCJul 15, 10:30 UTC10m
2026-07-15 JTA5 - Jul 15, 06:45 UTCJul 15, 07:00 UTC15m
2026-07-15 JTA5 - Jul 15, 05:30 UTCJul 15, 06:00 UTC30m
2026-07-15 JTA4 - Jul 15, 02:25 UTCJul 15, 04:00 UTC1h 35m
2026-07-15 JTA1 - Jul 15, 01:00 UTCJul 15, 01:15 UTC15m
2026-07-14 JTA1 - Jul 14, 23:45 UTCJul 15, 00:20 UTC35m

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 JA350J page for operator, model, and routing details .

Mode-S 851F4E frequently asked

What is Mode-S code 851F4E?
851F4E is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA350J.
Where is Mode-S 851F4E registered?
Mode-S code 851F4E is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 851F4E broadcasting right now?
Yes. Mode-S 851F4E is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 851F4E, octal 41217516, decimal 8,724,302.
What flights does 851F4E operate?
Mode-S 851F4E has broadcast 20 distinct callsigns, including JTA37, JTA63, JTA57, JTA42, JTA16.