Apparatus

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sensors Mode-S transponder

840CD2

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA03JC · ATR-42-600

Hex
840CD2
Octal
41006322
Decimal
8,654,034
Country
JP
Tail
JA03JC
Type
AT46
No current signal · last broadcast Jul 24, 06:10 UTC
Flights observed
268
Distinct callsigns
20
Country
JP
Last broadcast
Jul 24, 06:10 UTC

Last known position

Most recent position reported by Mode-S 840CD2.

Country allocation

The ICAO 24-bit address 840CD2 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
JL3555 - 15 2026-07-14
JL3554 - 15 2026-07-14
JL3653 - 14 2026-07-15
JL3551 - 14 2026-07-14
JL3550 - 13 2026-07-15
JL3673 - 12 2026-07-14
JL2451 Japan Airlines 12 2026-07-23
JL2324 - 12 2026-07-23
JL2323 Japan Airlines 12 2026-07-23
JL2326 Japan Airlines 11 2026-07-19
JL2325 - 11 2026-07-19
JL2450 - 10 2026-07-19
JL3686 Japan Airlines 9 2026-07-23
JL3716 Japan Airlines 7 2026-07-24
JL3867 - 6 2026-07-17
JL3866 Japan Airlines 6 2026-07-17
JL3715 Japan Airlines 6 2026-07-24
JL3654 - 6 2026-07-14
JL3676 - 5 2026-07-14
JC4230 - 3 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 JL3715 OKA → OKE Jul 24, 05:55 UTCJul 24, 06:10 UTC15m
2026-07-24 JL3716 OKE → OKA Jul 24, 04:10 UTCJul 24, 04:30 UTC20m
2026-07-23 JL3686 MYJ → KOJ Jul 23, 11:30 UTCJul 23, 11:40 UTC10m
2026-07-23 JL3687 KOJ → MYJ Jul 23, 10:10 UTCJul 23, 10:25 UTC15m
2026-07-23 JL2451 ITM → KUM Jul 23, 02:30 UTCJul 23, 03:00 UTC30m
2026-07-23 JL2324 - Jul 23, 01:15 UTCJul 23, 01:30 UTC15m
2026-07-23 JL2323 ITM → TJH Jul 23, 00:15 UTCJul 23, 00:35 UTC20m
2026-07-20 JL3686 MYJ → KOJ Jul 20, 11:30 UTCJul 20, 12:05 UTC35m
2026-07-20 JL2451 - Jul 20, 02:35 UTCJul 20, 03:10 UTC35m
2026-07-20 JL2324 - Jul 20, 01:20 UTCJul 20, 01:40 UTC20m
2026-07-20 JL2323 ITM → TJH Jul 20, 00:10 UTCJul 20, 00:25 UTC15m
2026-07-19 JL2326 TJH → ITM Jul 19, 09:20 UTCJul 19, 09:35 UTC15m
2026-07-19 JL2325 - Jul 19, 08:15 UTCJul 19, 08:30 UTC15m
2026-07-19 JL2450 - Jul 19, 07:10 UTCJul 19, 07:30 UTC20m
2026-07-18 JL3715 OKA → OKE Jul 18, 06:00 UTCJul 18, 06:15 UTC15m
2026-07-18 JL3716 OKE → OKA Jul 18, 04:00 UTCJul 18, 04:20 UTC20m
2026-07-17 JL3867 - Jul 17, 05:15 UTCJul 17, 05:39 UTC25m
2026-07-17 JL3866 RNJ → OKA Jul 17, 03:45 UTCJul 17, 03:59 UTC15m
2026-07-16 JL3715 - Jul 16, 06:00 UTCJul 16, 06:15 UTC15m
2026-07-16 JL3716 - Jul 16, 04:00 UTCJul 16, 04:25 UTC25m
2026-07-15 JL3653 - Jul 15, 04:15 UTCJul 15, 04:35 UTC20m
2026-07-15 JL3550 - Jul 15, 02:25 UTCJul 15, 02:55 UTC30m
2026-07-14 JL3551 - Jul 14, 22:30 UTCJul 14, 23:05 UTC34m
2026-07-14 JL3554 - Jul 14, 10:30 UTCJul 14, 10:55 UTC25m
2026-07-14 JL3555 - Jul 14, 08:50 UTCJul 14, 09:25 UTC35m
2026-07-14 JL3676 - Jul 14, 07:20 UTCJul 14, 07:40 UTC20m
2026-07-14 JL3673 - Jul 14, 05:05 UTCJul 14, 05:25 UTC20m
2026-07-14 JL3654 - Jul 14, 03:20 UTCJul 14, 03:40 UTC20m
2026-07-13 JL3715 - Jul 13, 06:05 UTCJul 13, 06:25 UTC20m
2026-07-13 JL3716 - Jul 13, 04:25 UTCJul 13, 04:50 UTC25m
2026-07-12 JL3867 - Jul 12, 05:10 UTCJul 12, 05:35 UTC25m
2026-07-12 JL3866 - Jul 12, 03:45 UTCJul 12, 04:05 UTC20m
2026-07-08 JL3686 - Jul 8, 11:35 UTCJul 8, 12:05 UTC30m
2026-07-08 JL2451 - Jul 8, 02:40 UTCJul 8, 03:20 UTC40m
2026-07-08 JL2324 - Jul 8, 01:15 UTCJul 8, 01:35 UTC20m
2026-07-08 JL2323 - Jul 8, 00:10 UTCJul 8, 00:25 UTC15m
2026-07-07 JL2326 - Jul 7, 09:05 UTCJul 7, 09:30 UTC25m
2026-07-07 JL2325 - Jul 7, 08:05 UTCJul 7, 08:20 UTC15m
2026-07-07 JL2450 - Jul 7, 07:00 UTCJul 7, 07:15 UTC15m
2026-07-05 JL3715 - Jul 5, 06:00 UTCJul 5, 06:15 UTC15m
2026-07-05 JL3716 - Jul 5, 04:00 UTCJul 5, 04:20 UTC20m
2026-07-04 JL3653 - Jul 4, 04:05 UTCJul 4, 04:25 UTC20m
2026-07-04 JL3550 - Jul 4, 02:25 UTCJul 4, 02:45 UTC20m
2026-07-03 JL3551 FUK → IZO Jul 3, 22:40 UTCJul 3, 23:10 UTC30m
2026-07-03 JL3554 - Jul 3, 10:35 UTCJul 3, 11:00 UTC25m
2026-07-03 JL3555 - Jul 3, 08:50 UTCJul 3, 09:25 UTC35m
2026-07-03 JL3676 - Jul 3, 07:30 UTCJul 3, 07:45 UTC15m
2026-07-03 JL3654 - Jul 3, 05:10 UTCJul 3, 05:20 UTC10m
2026-07-03 JL3654 - Jul 3, 03:35 UTCJul 3, 03:45 UTC10m
2026-07-02 JL3653 - Jul 2, 04:10 UTCJul 2, 04:20 UTC10m

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 JA03JC page for operator, model, and routing details .

Mode-S 840CD2 frequently asked

What is Mode-S code 840CD2?
840CD2 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA03JC.
Where is Mode-S 840CD2 registered?
Mode-S code 840CD2 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 840CD2 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 06:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 840CD2, octal 41006322, decimal 8,654,034.
What flights does 840CD2 operate?
Mode-S 840CD2 has broadcast 20 distinct callsigns, including JL3555, JL3554, JL3653, JL3551, JL3550.