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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 Jul 26, 12:35 UTC
Flights observed
178
Distinct callsigns
12
Country
JP
Last broadcast
Jul 26, 12:35 UTC

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 Spring Japan 41 2026-07-24
SJO213 - 38 2026-07-25
SJO254 Spring Japan 21 2026-07-22
SJO835 Spring Japan 15 2026-07-26
SJO622 Spring Japan 15 2026-07-24
SJO621 Spring Japan 15 2026-07-23
SJO214 Spring Japan 15 2026-07-24
SJO836 Spring Japan 12 2026-07-26
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
2026-07-26 SJO836 CTS → NRT Jul 26, 11:10 UTCJul 26, 12:30 UTC1h 20m
2026-07-26 SJO835 NRT → CTS Jul 26, 08:30 UTCJul 26, 09:50 UTC1h 20m
2026-07-25 SJO213 NRT → NRT Jul 25, 21:55 UTCJul 26, 06:35 UTC8h 41m
2026-07-25 SJO836 CTS → NRT Jul 25, 11:10 UTCJul 25, 12:25 UTC1h 15m
2026-07-25 SJO835 NRT → CTS Jul 25, 08:40 UTCJul 25, 10:00 UTC1h 20m
2026-07-24 SJO214 HRB → NRT Jul 24, 21:55 UTCJul 25, 06:40 UTC8h 45m
2026-07-24 SJO253 NRT → TSN Jul 24, 04:35 UTCJul 24, 12:10 UTC7h 35m
2026-07-24 SJO622 HIJ → NRT Jul 24, 01:10 UTCJul 24, 02:35 UTC1h 25m
2026-07-23 SJO621 NRT → HIJ Jul 23, 22:55 UTCJul 23, 23:55 UTC1h 0m
2026-07-23 SJO836 CTS → NRT Jul 23, 10:45 UTCJul 23, 12:00 UTC1h 15m
2026-07-23 SJO835 NRT → CTS Jul 23, 08:20 UTCJul 23, 09:40 UTC1h 20m
2026-07-22 SJO254 TSN → NRT Jul 22, 22:25 UTCJul 23, 06:15 UTC7h 50m
2026-07-21 SJO213 - Jul 21, 21:50 UTCJul 22, 11:55 UTC14h 5m
2026-07-21 SJO254 TSN → NRT Jul 21, 04:45 UTCJul 21, 12:25 UTC7h 40m
2026-07-20 SJO836 - Jul 20, 10:35 UTCJul 20, 11:45 UTC1h 10m
2026-07-20 SJO835 NRT → CTS Jul 20, 08:10 UTCJul 20, 09:25 UTC1h 15m
2026-07-19 SJO213 NRT → NRT Jul 19, 21:50 UTCJul 20, 06:15 UTC8h 25m
2026-07-19 SJO253 NRT → TSN Jul 19, 03:35 UTCJul 19, 10:55 UTC7h 20m
2026-07-18 SJO836 CTS → NRT Jul 18, 10:40 UTCJul 18, 11:50 UTC1h 10m
2026-07-18 SJO835 - Jul 18, 08:20 UTCJul 18, 09:35 UTC1h 15m
2026-07-17 SJO214 HRB → NRT Jul 17, 21:44 UTCJul 18, 06:10 UTC8h 26m
2026-07-17 SJO253 NRT → NRT Jul 17, 04:35 UTCJul 17, 11:39 UTC7h 5m
2026-07-17 SJO622 HIJ → NRT Jul 17, 01:09 UTCJul 17, 02:25 UTC1h 15m
2026-07-16 SJO621 NRT → HIJ Jul 16, 22:59 UTCJul 17, 00:10 UTC1h 10m
2026-07-16 SJO836 - Jul 16, 10:45 UTCJul 16, 11:50 UTC1h 5m
2026-07-16 SJO835 - Jul 16, 08:20 UTCJul 16, 09:30 UTC1h 10m
2026-07-15 SJO253 - Jul 15, 22:20 UTCJul 16, 05:35 UTC7h 15m
2026-07-14 SJO213 NRT → NRT Jul 14, 22:00 UTCJul 15, 06:30 UTC8h 29m
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

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 Jul 26, 12:35 UTC.
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, SJO835, SJO622.