Apparatus

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sensors Mode-S transponder

841B22

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA07JC · ATR-42-600

Hex
841B22
Octal
41015442
Decimal
8,657,698
Country
JP
Tail
JA07JC
Type
AT46
No current signal · last broadcast 2h ago
Flights observed
108
Distinct callsigns
20
Country
JP
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 841B22.

Country allocation

The ICAO 24-bit address 841B22 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
JL2324 - 11 2026-07-14
JL2323 - 11 2026-07-14
JL2451 - 10 2026-07-14
JL2325 Japan Airlines 10 2026-06-08
JL2450 Japan Airlines 8 2026-06-08
JL3555 - 7 2026-06-20
JL2326 Japan Airlines 7 2026-06-08
JL3551 Japan Airlines 6 2026-06-20
JL3686 Japan Airlines 5 2026-06-09
JL3653 - 5 2026-06-21
JL3554 - 5 2026-06-20
JL3550 - 5 2026-06-21
JL3716 - 4 2026-07-12
JL3715 - 4 2026-07-12
JL3673 Japan Airlines 3 2026-06-13
JC4230 - 2 2026-07-13
JL3867 Japan Airlines 1 2026-05-16
JL3866 Japan Airlines 1 2026-05-16
JL3800 Japan Airlines 1 2026-04-13
JL3676 - 1 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 JL2451 - Jul 14, 02:35 UTCJul 14, 03:15 UTC40m
2026-07-14 JL2324 - Jul 14, 01:10 UTCJul 14, 01:35 UTC25m
2026-07-14 JL2323 - Jul 14, 00:10 UTCJul 14, 00:25 UTC15m
2026-07-13 JC4230 - Jul 13, 09:25 UTCJul 13, 09:45 UTC20m
2026-07-12 JL3715 - Jul 12, 05:55 UTCJul 12, 06:10 UTC15m
2026-07-12 JL3716 - Jul 12, 04:25 UTCJul 12, 04:45 UTC20m
2026-06-21 JL3653 - Jun 21, 04:20 UTCJun 21, 04:30 UTC10m
2026-06-21 JL3550 - Jun 21, 02:15 UTCJun 21, 03:14 UTC1h 0m
2026-06-20 JL3551 FUK → IZO Jun 20, 22:30 UTCJun 20, 23:14 UTC45m
2026-06-20 JL3554 - Jun 20, 10:29 UTCJun 20, 10:49 UTC20m
2026-06-20 JL3555 - Jun 20, 08:44 UTCJun 20, 09:24 UTC40m
2026-06-14 JL3653 FUK → KOJ Jun 14, 04:10 UTCJun 14, 04:20 UTC10m
2026-06-14 JL3550 - Jun 14, 02:05 UTCJun 14, 02:20 UTC15m
2026-06-13 JL3551 FUK → IZO Jun 13, 22:25 UTCJun 13, 23:00 UTC35m
2026-06-13 JL3554 IZO → FUK Jun 13, 10:25 UTCJun 13, 10:50 UTC25m
2026-06-13 JL3555 FUK → IZO Jun 13, 08:50 UTCJun 13, 09:25 UTC35m
2026-06-13 JL3673 FUK → KUM Jun 13, 05:10 UTCJun 13, 05:20 UTC10m
2026-06-09 JL3686 MYJ → KOJ Jun 9, 11:35 UTCJun 9, 11:45 UTC10m
2026-06-09 JL2451 ITM → KUM Jun 9, 02:35 UTCJun 9, 03:10 UTC35m
2026-06-09 JL2324 - Jun 9, 01:15 UTCJun 9, 01:35 UTC20m
2026-06-09 JL2323 ITM → TJH Jun 9, 00:15 UTCJun 9, 00:35 UTC20m
2026-06-08 JL2326 TJH → ITM Jun 8, 09:20 UTCJun 8, 09:40 UTC20m
2026-06-08 JL2325 ITM → TJH Jun 8, 08:20 UTCJun 8, 08:35 UTC15m
2026-06-08 JL2450 KUM → ITM Jun 8, 07:10 UTCJun 8, 07:35 UTC25m
2026-06-06 JL2451 ITM → KUM Jun 6, 02:40 UTCJun 6, 03:10 UTC30m
2026-06-06 JL2324 - Jun 6, 01:10 UTCJun 6, 01:35 UTC25m
2026-06-06 JL2323 ITM → TJH Jun 6, 00:05 UTCJun 6, 00:20 UTC15m
2026-06-05 JL2326 TJH → ITM Jun 5, 09:10 UTCJun 5, 09:25 UTC15m
2026-06-05 JL2325 ITM → TJH Jun 5, 08:05 UTCJun 5, 08:20 UTC15m
2026-06-05 JL2450 KUM → ITM Jun 5, 06:55 UTCJun 5, 07:15 UTC20m
2026-06-03 JL3686 MYJ → KOJ Jun 3, 11:30 UTCJun 3, 11:40 UTC10m
2026-05-20 JL3653 FUK → KOJ May 20, 04:05 UTCMay 20, 04:15 UTC10m
2026-05-20 JL3550 IZO → FUK May 20, 02:05 UTCMay 20, 02:30 UTC25m
2026-05-19 JL3551 FUK → IZO May 19, 22:30 UTCMay 19, 23:05 UTC35m
2026-05-19 JL3554 IZO → FUK May 19, 10:35 UTCMay 19, 11:05 UTC30m
2026-05-19 JL3555 FUK → IZO May 19, 08:55 UTCMay 19, 09:35 UTC40m
2026-05-19 JL3673 FUK → KUM May 19, 05:10 UTCMay 19, 05:20 UTC10m
2026-05-17 JL3715 OKA → OKE May 17, 05:50 UTCMay 17, 06:10 UTC20m
2026-05-17 JL3716 OKE → OKA May 17, 04:05 UTCMay 17, 04:20 UTC15m
2026-05-16 JL3867 OKA → ASJ May 16, 05:05 UTCMay 16, 05:25 UTC20m
2026-05-16 JL3866 RNJ → OKA May 16, 03:40 UTCMay 16, 03:55 UTC15m
2026-05-15 JL3686 MYJ → KOJ May 15, 11:35 UTCMay 15, 11:45 UTC10m
2026-05-15 JL2451 ITM → KUM May 15, 02:35 UTCMay 15, 03:00 UTC25m
2026-05-15 JL2324 - May 15, 01:15 UTCMay 15, 01:30 UTC15m
2026-05-15 JL2323 - May 15, 00:05 UTCMay 15, 00:15 UTC10m
2026-05-14 JL2326 TJH → ITM May 14, 09:55 UTCMay 14, 10:20 UTC25m
2026-05-14 JL2325 ITM → TJH May 14, 09:05 UTCMay 14, 09:20 UTC15m
2026-05-14 JL2450 KUM → ITM May 14, 07:55 UTCMay 14, 08:20 UTC25m
2026-05-10 JL3686 MYJ → KOJ May 10, 11:20 UTCMay 10, 11:30 UTC10m
2026-05-10 JL2451 ITM → KUM May 10, 02:30 UTCMay 10, 02:55 UTC25m

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 JA07JC page for operator, model, and routing details .

Mode-S 841B22 frequently asked

What is Mode-S code 841B22?
841B22 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA07JC.
Where is Mode-S 841B22 registered?
Mode-S code 841B22 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 841B22 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 841B22, octal 41015442, decimal 8,657,698.
What flights does 841B22 operate?
Mode-S 841B22 has broadcast 20 distinct callsigns, including JL2324, JL2323, JL2451, JL2325, JL2450.