Apparatus

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sensors Mode-S transponder

840CAF

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA03GR · BOEING 737-800

Hex
840CAF
Octal
41006257
Decimal
8,653,999
Country
JP
Tail
JA03GR
Type
B738
No current signal · last broadcast 16m ago
Flights observed
90
Distinct callsigns
9
Country
JP
Last broadcast
16m ago

Last known position

Most recent position reported by Mode-S 840CAF.

Country allocation

The ICAO 24-bit address 840CAF 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 9 distinct

Callsign Airline Flights Last seen
SJO253 Spring Japan 22 2026-05-30
SJO213 - 20 2026-05-27
SJO254 Spring Japan 14 2026-05-19
SJO622 Spring Japan 10 2026-05-30
SJO621 Spring Japan 10 2026-05-29
SJO214 Spring Japan 9 2026-05-24
SJO836 Spring Japan 2 2026-05-24
SJO835 Spring Japan 2 2026-05-24
SJO214D - 1 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 SJO253 NRT → TSN May 30, 04:25 UTCMay 30, 05:45 UTC1h 20m
2026-05-30 SJO622 HIJ → NRT May 30, 01:15 UTCMay 30, 02:20 UTC1h 5m
2026-05-29 SJO621 NRT → HIJ May 29, 22:55 UTCMay 30, 00:05 UTC1h 10m
2026-05-29 SJO253 NRT → TSN May 29, 04:25 UTCMay 29, 11:30 UTC7h 5m
2026-05-29 SJO622 HIJ → NRT May 29, 01:05 UTCMay 29, 02:10 UTC1h 5m
2026-05-28 SJO621 NRT → HIJ May 28, 22:50 UTCMay 29, 00:00 UTC1h 10m
2026-05-27 SJO213 NRT → NRT May 27, 22:10 UTCMay 28, 06:50 UTC8h 40m
2026-05-26 SJO213 NRT → NRT May 26, 21:59 UTCMay 27, 06:55 UTC8h 55m
2026-05-26 SJO253 NRT → TSN May 26, 04:45 UTCMay 26, 12:10 UTC7h 25m
2026-05-24 SJO214 HRB → NRT May 24, 23:30 UTCMay 25, 06:35 UTC7h 5m
2026-05-24 SJO836 CTS → NRT May 24, 10:35 UTCMay 24, 11:50 UTC1h 15m
2026-05-24 SJO835 NRT → CTS May 24, 08:20 UTCMay 24, 09:40 UTC1h 20m
2026-05-23 SJO213 NRT → NRT May 23, 21:55 UTCMay 24, 06:45 UTC8h 50m
2026-05-23 SJO836 CTS → NRT May 23, 10:30 UTCMay 23, 11:45 UTC1h 15m
2026-05-23 SJO835 NRT → CTS May 23, 08:10 UTCMay 23, 09:25 UTC1h 15m
2026-05-22 SJO213 - May 22, 21:45 UTCMay 23, 06:10 UTC8h 24m
2026-05-21 SJO214 HRB → NRT May 21, 22:00 UTCMay 22, 07:15 UTC9h 15m
2026-05-20 SJO213 - May 20, 22:10 UTCMay 21, 06:50 UTC8h 40m
2026-05-19 SJO214 HRB → NRT May 19, 21:55 UTCMay 20, 06:35 UTC8h 41m
2026-05-19 SJO254 TSN → NRT May 19, 05:05 UTCMay 19, 12:15 UTC7h 10m
2026-05-18 SJO254 TSN → NRT May 18, 04:20 UTCMay 18, 11:35 UTC7h 15m
2026-05-17 SJO254 TSN → NRT May 17, 03:35 UTCMay 17, 11:01 UTC7h 25m
2026-05-16 SJO254 TSN → NRT May 16, 04:25 UTCMay 16, 11:46 UTC7h 21m
2026-05-16 SJO622 HIJ → NRT May 16, 01:15 UTCMay 16, 02:35 UTC1h 20m
2026-05-15 SJO621 NRT → HIJ May 15, 22:55 UTCMay 15, 23:55 UTC1h 0m
2026-05-15 SJO254 TSN → NRT May 15, 04:20 UTCMay 15, 11:50 UTC7h 30m
2026-05-13 SJO254 TSN → NRT May 13, 22:20 UTCMay 14, 06:15 UTC7h 55m
2026-05-13 SJO254 TSN → NRT May 13, 04:15 UTCMay 13, 11:45 UTC7h 30m
2026-05-12 SJO254 TSN → NRT May 12, 05:00 UTCMay 12, 12:25 UTC7h 25m
2026-05-10 SJO213 NRT → NRT May 10, 21:44 UTCMay 11, 06:30 UTC8h 45m
2026-05-09 SJO213 - May 9, 21:55 UTCMay 10, 06:40 UTC8h 45m
2026-05-08 SJO213 NRT → NRT May 8, 22:05 UTCMay 9, 07:10 UTC9h 5m
2026-05-08 SJO253 NRT → TSN May 8, 04:34 UTCMay 8, 12:25 UTC7h 50m
2026-05-06 SJO253 NRT → TSN May 6, 22:15 UTCMay 7, 05:50 UTC7h 35m
2026-05-06 SJO253 NRT → TSN May 6, 04:30 UTCMay 6, 12:30 UTC8h 0m
2026-05-06 SJO622 HIJ → NRT May 6, 01:15 UTCMay 6, 02:30 UTC1h 15m
2026-05-05 SJO621 NRT → HIJ May 5, 22:50 UTCMay 6, 00:15 UTC1h 25m
2026-05-05 SJO253 NRT → TSN May 5, 04:50 UTCMay 5, 12:10 UTC7h 20m
2026-05-05 SJO622 HIJ → NRT May 5, 01:05 UTCMay 5, 02:10 UTC1h 5m
2026-05-04 SJO621 NRT → HIJ May 4, 22:45 UTCMay 4, 23:55 UTC1h 10m
2026-05-04 SJO253 NRT → TSN May 4, 04:29 UTCMay 4, 12:25 UTC7h 55m
2026-05-04 SJO622 HIJ → NRT May 4, 01:15 UTCMay 4, 02:35 UTC1h 20m
2026-05-03 SJO621 NRT → HIJ May 3, 23:00 UTCMay 4, 00:15 UTC1h 15m
2026-05-03 SJO253 NRT → TSN May 3, 03:45 UTCMay 3, 11:40 UTC7h 55m
2026-05-02 SJO253 NRT → TSN May 2, 04:15 UTCMay 2, 11:55 UTC7h 40m
2026-05-02 SJO622 HIJ → NRT May 2, 01:05 UTCMay 2, 02:15 UTC1h 10m
2026-05-01 SJO621 NRT → HIJ May 1, 22:45 UTCMay 2, 00:05 UTC1h 20m
2026-05-01 SJO253 NRT → TSN May 1, 04:50 UTCMay 1, 12:20 UTC7h 30m
2026-05-01 SJO622 HIJ → NRT May 1, 01:25 UTCMay 1, 02:45 UTC1h 20m
2026-04-30 SJO621 NRT → HIJ Apr 30, 23:05 UTCMay 1, 00:20 UTC1h 15m

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 JA03GR page for operator, model, and routing details .

Mode-S 840CAF frequently asked

What is Mode-S code 840CAF?
840CAF is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA03GR.
Where is Mode-S 840CAF registered?
Mode-S code 840CAF is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 840CAF broadcasting right now?
No active broadcast right now. Last signal was 16m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 840CAF, octal 41006257, decimal 8,653,999.
What flights does 840CAF operate?
Mode-S 840CAF has broadcast 9 distinct callsigns, including SJO253, SJO213, SJO254, SJO622, SJO621.