Apparatus

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sensors Mode-S transponder

840D81

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA03RK · BOEING 737-800

Hex
840D81
Octal
41006601
Decimal
8,654,209
Country
JP
Tail
JA03RK
Type
B738
No current signal · last broadcast Jul 26, 13:35 UTC
Flights observed
376
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 13:35 UTC

Last known position

Most recent position reported by Mode-S 840D81.

Country allocation

The ICAO 24-bit address 840D81 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
JTA1 - 15 2026-07-01
JTA5 - 12 2026-07-02
JTA37 Japan Transocean Air 12 2026-07-26
JTA53 Japan Transocean Air 11 2026-07-21
JTA46 - 10 2026-07-16
JTA301 - 10 2026-07-07
JTA13 Japan Transocean Air 10 2026-07-25
JTA86 Japan Transocean Air 9 2026-06-24
JTA61 - 9 2026-07-06
JTA42 Japan Transocean Air 9 2026-07-21
JTA302 - 9 2026-07-07
JTA9 - 8 2026-07-20
JTA47 Japan Transocean Air 8 2026-07-21
JTA36 Japan Transocean Air 8 2026-07-26
JTA16 Japan Transocean Air 8 2026-07-23
JTA83 Japan Transocean Air 7 2026-07-23
JTA50 Japan Transocean Air 7 2026-07-20
JTA8 - 6 2026-07-20
JTA65 - 6 2026-06-18
JTA54 - 6 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JTA48 OKA → NGO Jul 26, 12:00 UTCJul 26, 13:35 UTC1h 35m
2026-07-26 JTA572 MMY → OKA Jul 26, 10:45 UTCJul 26, 10:55 UTC10m
2026-07-26 JTA37 KMQ → OKA Jul 26, 07:20 UTCJul 26, 07:35 UTC15m
2026-07-26 JTA37 KMQ → OKA Jul 26, 05:45 UTCJul 26, 06:40 UTC56m
2026-07-26 JTA36 OKA → KMQ Jul 26, 02:45 UTCJul 26, 04:35 UTC1h 50m
2026-07-25 JTA13 OKJ → OKA Jul 25, 23:45 UTCJul 26, 01:20 UTC1h 35m
2026-07-25 JAL241 HND → OKJ Jul 25, 11:25 UTCJul 25, 12:15 UTC50m
2026-07-25 JAL240 OKJ → HND Jul 25, 09:05 UTCJul 25, 10:05 UTC1h 0m
2026-07-25 JAL237 HND → OKJ Jul 25, 05:55 UTCJul 25, 06:45 UTC50m
2026-07-25 JTA236 OKJ → HND Jul 25, 03:40 UTCJul 25, 04:45 UTC1h 5m
2026-07-25 JAL233 HND → OKJ Jul 25, 01:45 UTCJul 25, 02:35 UTC50m
2026-07-24 JAL182 KMQ → HND Jul 24, 22:55 UTCJul 24, 23:45 UTC50m
2026-07-24 JAL193 HND → KMQ Jul 24, 13:10 UTCJul 24, 13:50 UTC40m
2026-07-24 JAL190 KMQ → HND Jul 24, 10:55 UTCJul 24, 12:00 UTC1h 5m
2026-07-24 JAL189 HND → KIX Jul 24, 09:05 UTCJul 24, 09:45 UTC40m
2026-07-24 JAL188 KMQ → HND Jul 24, 06:10 UTCJul 24, 07:00 UTC50m
2026-07-24 JAL187 HND → KMQ Jul 24, 04:30 UTCJul 24, 05:10 UTC40m
2026-07-24 JAL186 KIX → HND Jul 24, 02:15 UTCJul 24, 03:15 UTC1h 0m
2026-07-24 JAL185 HND → KMQ Jul 24, 00:40 UTCJul 24, 01:20 UTC40m
2026-07-23 JAL232 OKJ → HND Jul 23, 22:15 UTCJul 23, 23:15 UTC1h 0m
2026-07-23 JTA16 OKA → OKJ Jul 23, 10:05 UTCJul 23, 11:25 UTC1h 20m
2026-07-23 JTA564 MMY → OKA Jul 23, 08:40 UTCJul 23, 08:55 UTC15m
2026-07-23 JTA612 ISG → OKA Jul 23, 04:45 UTCJul 23, 05:00 UTC15m
2026-07-23 JTA83 KIX → ISG Jul 23, 01:15 UTCJul 23, 02:50 UTC1h 35m
2026-07-22 JTA2 - Jul 22, 22:25 UTCJul 22, 23:55 UTC1h 30m
2026-07-22 JTA49 NGO → OKA Jul 22, 10:20 UTCJul 22, 11:30 UTC1h 10m
2026-07-21 JTA121 KIX → MMY Jul 21, 22:55 UTCJul 22, 00:30 UTC1h 35m
2026-07-21 JTA128 - Jul 21, 11:00 UTCJul 21, 12:45 UTC1h 45m
2026-07-21 JTA47 NGO → OKA Jul 21, 06:15 UTCJul 21, 07:55 UTC1h 40m
2026-07-21 JTA42 OKA → NGO Jul 21, 04:40 UTCJul 21, 05:00 UTC20m
2026-07-21 JTA42 OKA → NGO Jul 21, 03:20 UTCJul 21, 03:35 UTC15m
2026-07-21 JTA53 FUK → OKA Jul 21, 01:45 UTCJul 21, 02:00 UTC15m
2026-07-21 JTA53 FUK → OKA Jul 21, 00:50 UTCJul 21, 01:00 UTC10m
2026-07-20 JTA50 OKA → FUK Jul 20, 23:20 UTCJul 20, 23:35 UTC15m
2026-07-20 JTA50 OKA → FUK Jul 20, 22:30 UTCJul 20, 22:40 UTC10m
2026-07-20 JTA9 - Jul 20, 11:35 UTCJul 20, 13:10 UTC1h 35m
2026-07-20 JTA8 - Jul 20, 08:40 UTCJul 20, 10:15 UTC1h 35m
2026-07-20 JTA37 - Jul 20, 06:50 UTCJul 20, 07:05 UTC15m
2026-07-20 JTA37 - Jul 20, 05:15 UTCJul 20, 06:10 UTC55m
2026-07-20 JTA36 - Jul 20, 02:35 UTCJul 20, 04:20 UTC1h 45m
2026-07-20 JTA13 OKJ → OKA Jul 20, 00:50 UTCJul 20, 01:05 UTC15m
2026-07-19 JTA13 OKJ → OKA Jul 19, 23:40 UTCJul 20, 00:10 UTC30m
2026-07-19 JAL241 - Jul 19, 11:05 UTCJul 19, 11:50 UTC45m
2026-07-19 JAL240 OKJ → HND Jul 19, 08:50 UTCJul 19, 10:00 UTC1h 10m
2026-07-19 JAL237 - Jul 19, 05:55 UTCJul 19, 06:40 UTC45m
2026-07-19 JAL236 OKJ → HND Jul 19, 03:30 UTCJul 19, 04:30 UTC1h 0m
2026-07-19 JAL233 HND → OKJ Jul 19, 01:35 UTCJul 19, 02:25 UTC50m
2026-07-18 JAL182 KMQ → HND Jul 18, 22:40 UTCJul 18, 23:35 UTC55m
2026-07-18 JAL193 - Jul 18, 12:05 UTCJul 18, 12:45 UTC40m
2026-07-18 JAL190 - Jul 18, 09:50 UTCJul 18, 10:50 UTC1h 0m

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 JA03RK page for operator, model, and routing details .

Mode-S 840D81 frequently asked

What is Mode-S code 840D81?
840D81 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA03RK.
Where is Mode-S 840D81 registered?
Mode-S code 840D81 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 840D81 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 13:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 840D81, octal 41006601, decimal 8,654,209.
What flights does 840D81 operate?
Mode-S 840D81 has broadcast 20 distinct callsigns, including JTA1, JTA5, JTA37, JTA53, JTA46.