Apparatus

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sensors Mode-S transponder

841F65

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA08RK · BOEING 737-800

Hex
841F65
Octal
41017545
Decimal
8,658,789
Country
JP
Tail
JA08RK
Type
B738
No current signal · last broadcast Jul 26, 13:25 UTC
Flights observed
414
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 13:25 UTC

Last known position

Most recent position reported by Mode-S 841F65.

Country allocation

The ICAO 24-bit address 841F65 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
JTA9 - 14 2026-07-19
JTA53 Japan Transocean Air 13 2026-07-22
JTA5 - 13 2026-07-12
JTA44 Japan Transocean Air 12 2026-07-23
JTA63 - 10 2026-07-11
JTA51 Japan Transocean Air 10 2026-07-18
JTA42 Japan Transocean Air 10 2026-07-22
JTA302 Japan Transocean Air 10 2026-07-24
JTA301 Japan Transocean Air 10 2026-07-23
JTA8 - 9 2026-07-19
JTA50 Japan Transocean Air 9 2026-07-21
JTA49 Japan Transocean Air 9 2026-07-23
JTA37 - 9 2026-07-17
JTA83 - 8 2026-07-04
JTA61 Japan Transocean Air 8 2026-07-21
JTA128 - 8 2026-07-22
JTA1 - 8 2026-06-26
JTA65 Japan Transocean Air 7 2026-07-21
JTA62 - 7 2026-07-18
JTA58 - 7 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JAL241 HND → OKJ Jul 26, 12:35 UTCJul 26, 13:25 UTC50m
2026-07-26 JAL240 OKJ → HND Jul 26, 10:00 UTCJul 26, 11:10 UTC1h 10m
2026-07-26 JAL237 HND → OKJ Jul 26, 06:20 UTCJul 26, 07:10 UTC51m
2026-07-26 JAL236 OKJ → HND Jul 26, 03:40 UTCJul 26, 05:05 UTC1h 25m
2026-07-26 JAL233 HND → OKJ Jul 26, 01:35 UTCJul 26, 02:25 UTC50m
2026-07-25 JAL182 KMQ → HND Jul 25, 22:50 UTCJul 25, 23:50 UTC1h 0m
2026-07-25 JAL193 HND → KMQ Jul 25, 12:50 UTCJul 25, 13:30 UTC40m
2026-07-25 JAL190 KMQ → HND Jul 25, 10:30 UTCJul 25, 11:25 UTC55m
2026-07-25 JAL189 HND → KIX Jul 25, 08:40 UTCJul 25, 09:20 UTC40m
2026-07-25 JAL188 KMQ → HND Jul 25, 06:05 UTCJul 25, 06:50 UTC45m
2026-07-25 JAL187 HND → KMQ Jul 25, 04:25 UTCJul 25, 05:05 UTC40m
2026-07-25 JAL186 KIX → HND Jul 25, 02:20 UTCJul 25, 03:15 UTC55m
2026-07-25 JAL185 HND → KMQ Jul 25, 00:40 UTCJul 25, 01:25 UTC45m
2026-07-24 JAL232 OKJ → HND Jul 24, 22:45 UTCJul 24, 23:45 UTC1h 0m
2026-07-24 JTA16 OKA → OKJ Jul 24, 09:55 UTCJul 24, 11:20 UTC1h 25m
2026-07-24 JTA302 TPE → OKA Jul 24, 03:25 UTCJul 24, 03:40 UTC15m
2026-07-24 JTA302 TPE → OKA Jul 24, 02:30 UTCJul 24, 02:45 UTC15m
2026-07-23 JTA301 OKA → TPE Jul 23, 23:45 UTCJul 24, 00:50 UTC1h 5m
2026-07-23 JTA49 NGO → OKA Jul 23, 09:45 UTCJul 23, 11:30 UTC1h 45m
2026-07-23 JTA44 OKA → NGO Jul 23, 08:25 UTCJul 23, 08:35 UTC10m
2026-07-23 JTA44 OKA → NGO Jul 23, 07:05 UTCJul 23, 07:20 UTC15m
2026-07-23 JTA560 MMY → OKA Jul 23, 05:50 UTCJul 23, 06:00 UTC10m
2026-07-22 JTA121 KIX → MMY Jul 22, 23:00 UTCJul 23, 00:35 UTC1h 35m
2026-07-22 JTA128 - Jul 22, 11:25 UTCJul 22, 12:50 UTC1h 25m
2026-07-22 JTA42 OKA → NGO Jul 22, 03:35 UTCJul 22, 05:15 UTC1h 40m
2026-07-22 JTA53 FUK → OKA Jul 22, 01:10 UTCJul 22, 02:20 UTC1h 10m
2026-07-21 JTA50 OKA → FUK Jul 21, 22:35 UTCJul 21, 23:40 UTC1h 5m
2026-07-21 JTA65 FUK → OKA Jul 21, 13:05 UTCJul 21, 13:20 UTC15m
2026-07-21 JTA65 FUK → OKA Jul 21, 12:10 UTCJul 21, 12:25 UTC15m
2026-07-21 JTA60 OKA → FUK Jul 21, 09:55 UTCJul 21, 11:05 UTC1h 10m
2026-07-21 JTA61 FUK → OKA Jul 21, 08:25 UTCJul 21, 08:40 UTC15m
2026-07-21 JTA61 FUK → OKA Jul 21, 07:30 UTCJul 21, 07:45 UTC15m
2026-07-21 JTA54 OKA → FUK Jul 21, 04:50 UTCJul 21, 05:55 UTC1h 5m
2026-07-21 JTA558 MMY → OKA Jul 21, 03:20 UTCJul 21, 03:30 UTC10m
2026-07-20 JTA43 - Jul 20, 22:45 UTCJul 21, 00:30 UTC1h 44m
2026-07-20 JTA48 - Jul 20, 13:00 UTCJul 20, 13:10 UTC10m
2026-07-20 JTA48 - Jul 20, 11:40 UTCJul 20, 11:55 UTC15m
2026-07-20 JTA572 MMY → OKA Jul 20, 10:20 UTCJul 20, 10:35 UTC15m
2026-07-20 JTA562 MMY → OKA Jul 20, 07:10 UTCJul 20, 07:20 UTC10m
2026-07-19 JTA9 - Jul 19, 13:10 UTCJul 19, 13:25 UTC15m
2026-07-19 JTA9 - Jul 19, 11:50 UTCJul 19, 12:30 UTC40m
2026-07-19 JTA8 - Jul 19, 08:40 UTCJul 19, 10:20 UTC1h 40m
2026-07-19 JTA614 - Jul 19, 06:20 UTCJul 19, 06:30 UTC10m
2026-07-18 JTA51 FUK → OKA Jul 18, 23:25 UTCJul 18, 23:35 UTC10m
2026-07-18 JTA51 FUK → OKA Jul 18, 22:25 UTCJul 18, 22:35 UTC10m
2026-07-18 JTA62 - Jul 18, 11:45 UTCJul 18, 12:05 UTC20m
2026-07-18 JTA62 - Jul 18, 10:55 UTCJul 18, 11:05 UTC10m
2026-07-18 JTA47 - Jul 18, 07:15 UTCJul 18, 09:00 UTC1h 45m
2026-07-18 JTA42 - Jul 18, 05:30 UTCJul 18, 05:50 UTC20m
2026-07-18 JTA42 - Jul 18, 04:15 UTCJul 18, 04:30 UTC15m

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 JA08RK page for operator, model, and routing details .

Mode-S 841F65 frequently asked

What is Mode-S code 841F65?
841F65 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA08RK.
Where is Mode-S 841F65 registered?
Mode-S code 841F65 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 841F65 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 13:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 841F65, octal 41017545, decimal 8,658,789.
What flights does 841F65 operate?
Mode-S 841F65 has broadcast 20 distinct callsigns, including JTA9, JTA53, JTA5, JTA44, JTA63.