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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 1d ago
Flights observed
150
Distinct callsigns
12
Country
JP
Last broadcast
1d 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 12 distinct

Callsign Airline Flights Last seen
SJO253 - 37 2026-07-12
SJO213 - 34 2026-07-08
SJO254 - 19 2026-07-10
SJO622 - 13 2026-06-27
SJO621 Spring Japan 13 2026-06-26
SJO214 - 13 2026-07-12
SJO835 - 9 2026-07-11
SJO836 - 6 2026-07-05
SJO838 - 3 2026-07-11
SJO9812 - 1 2026-06-25
SJO9810 - 1 2026-06-12
SJO214D - 1 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 SJO214 - Jul 12, 22:00 UTCJul 13, 06:40 UTC8h 40m
2026-07-12 SJO253 NRT → NRT Jul 12, 03:35 UTCJul 12, 11:10 UTC7h 35m
2026-07-11 SJO838 - Jul 11, 12:10 UTCJul 11, 13:15 UTC1h 5m
2026-07-11 SJO835 - Jul 11, 09:50 UTCJul 11, 11:05 UTC1h 15m
2026-07-10 SJO214 - Jul 10, 21:50 UTCJul 11, 06:30 UTC8h 40m
2026-07-10 SJO254 - Jul 10, 04:25 UTCJul 10, 11:40 UTC7h 15m
2026-07-08 SJO213 NRT → NRT Jul 8, 22:10 UTCJul 9, 07:15 UTC9h 5m
2026-07-08 SJO253 NRT → NRT Jul 8, 04:20 UTCJul 8, 11:45 UTC7h 25m
2026-07-06 SJO214 - Jul 6, 23:00 UTCJul 7, 07:35 UTC8h 35m
2026-07-06 SJO253 NRT → NRT Jul 6, 04:25 UTCJul 6, 12:00 UTC7h 35m
2026-07-05 SJO836 - Jul 5, 10:40 UTCJul 5, 11:50 UTC1h 10m
2026-07-05 SJO835 - Jul 5, 08:15 UTCJul 5, 09:35 UTC1h 20m
2026-07-04 SJO213 NRT → NRT Jul 4, 21:45 UTCJul 5, 06:20 UTC8h 35m
2026-07-04 SJO253 NRT → NRT Jul 4, 04:15 UTCJul 4, 11:40 UTC7h 25m
2026-07-03 SJO838 - Jul 3, 12:10 UTCJul 3, 13:25 UTC1h 15m
2026-07-03 SJO835 - Jul 3, 09:40 UTCJul 3, 11:00 UTC1h 20m
2026-07-02 SJO213 NRT → NRT Jul 2, 23:00 UTCJul 3, 07:40 UTC8h 40m
2026-07-01 SJO253 - Jul 1, 22:20 UTCJul 2, 06:00 UTC7h 40m
2026-07-01 SJO253 NRT → NRT Jul 1, 04:30 UTCJul 1, 11:50 UTC7h 20m
2026-06-29 SJO213 - Jun 29, 22:00 UTCJun 30, 06:35 UTC8h 36m
2026-06-29 SJO253 NRT → NRT Jun 29, 04:04 UTCJun 29, 11:45 UTC7h 40m
2026-06-28 SJO838 - Jun 28, 12:09 UTCJun 28, 13:29 UTC1h 20m
2026-06-28 SJO835 NRT → CTS Jun 28, 09:50 UTCJun 28, 11:04 UTC1h 15m
2026-06-27 SJO213 - Jun 27, 21:59 UTCJun 28, 08:00 UTC10h 0m
2026-06-27 SJO253 - Jun 27, 04:39 UTCJun 27, 06:44 UTC2h 5m
2026-06-27 SJO622 - Jun 27, 01:24 UTCJun 27, 02:35 UTC1h 10m
2026-06-26 SJO621 NRT → HIJ Jun 26, 23:09 UTCJun 27, 00:29 UTC1h 20m
2026-06-26 SJO836 CTS → NRT Jun 26, 12:10 UTCJun 26, 13:40 UTC1h 30m
2026-06-26 SJO835 NRT → CTS Jun 26, 09:50 UTCJun 26, 11:05 UTC1h 15m
2026-06-25 SJO213 NRT → NRT Jun 25, 22:04 UTCJun 26, 07:24 UTC9h 20m
2026-06-25 SJO9812 - Jun 25, 09:45 UTCJun 25, 11:54 UTC2h 10m
2026-06-18 SJO213 - Jun 18, 22:05 UTCJun 19, 00:14 UTC2h 9m
2026-06-17 SJO213 NRT → NRT Jun 17, 22:00 UTCJun 18, 07:00 UTC9h 0m
2026-06-17 SJO254 NRT → NRT Jun 17, 04:20 UTCJun 17, 11:40 UTC7h 20m
2026-06-15 SJO213 NRT → NRT Jun 15, 21:50 UTCJun 16, 06:25 UTC8h 35m
2026-06-15 SJO253 NRT → NRT Jun 15, 04:20 UTCJun 15, 11:39 UTC7h 20m
2026-06-15 SJO622 - Jun 15, 01:04 UTCJun 15, 02:15 UTC1h 10m
2026-06-14 SJO621 NRT → HIJ Jun 14, 22:45 UTCJun 14, 23:59 UTC1h 14m
2026-06-14 SJO836 CTS → NRT Jun 14, 11:00 UTCJun 14, 12:10 UTC1h 10m
2026-06-14 SJO835 NRT → CTS Jun 14, 08:40 UTCJun 14, 09:55 UTC1h 15m
2026-06-13 SJO213 - Jun 13, 22:10 UTCJun 14, 06:45 UTC8h 35m
2026-06-12 SJO9810 - Jun 12, 21:20 UTCJun 12, 21:40 UTC20m
2026-06-11 SJO214 NRT → HND Jun 11, 21:50 UTCJun 12, 07:40 UTC9h 51m
2026-06-10 SJO253 NRT → TSN Jun 10, 22:25 UTCJun 11, 06:00 UTC7h 35m
2026-06-09 SJO213 - Jun 9, 21:50 UTCJun 10, 06:45 UTC8h 55m
2026-06-09 SJO253 NRT → TSN Jun 9, 05:15 UTCJun 9, 13:15 UTC8h 0m
2026-06-07 SJO213 - Jun 7, 21:55 UTCJun 8, 06:30 UTC8h 35m
2026-06-07 SJO254 TSN → NRT Jun 7, 09:10 UTCJun 7, 11:05 UTC1h 55m
2026-06-07 SJO253 NRT → TSN Jun 7, 03:35 UTCJun 7, 05:40 UTC2h 5m
2026-06-06 SJO836 CTS → NRT Jun 6, 10:50 UTCJun 6, 12:04 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 1d 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 12 distinct callsigns, including SJO253, SJO213, SJO254, SJO622, SJO621.