Apparatus

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sensors Mode-S transponder

840646

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA01QQ · ATR-72-600

Hex
840646
Octal
41003106
Decimal
8,652,358
Country
JP
Tail
JA01QQ
Type
AT76
No current signal · last broadcast 1d ago
Flights observed
191
Distinct callsigns
12
Country
JP
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 840646.

Country allocation

The ICAO 24-bit address 840646 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
TOK411 Airlines PNG 39 2026-06-07
TOK412 Airlines PNG 35 2026-06-07
TOK401 Airlines PNG 23 2026-06-06
TOK103 Airlines PNG 23 2026-06-07
TOK404 - 22 2026-06-07
TOK102 Airlines PNG 21 2026-06-07
TOK502 - 7 2026-05-30
TOK501 Airlines PNG 7 2026-05-30
TOK504 Airlines PNG 5 2026-05-16
TOK503 Airlines PNG 4 2026-05-16
JA01QQ - 3 2026-04-23
TOK9502 Airlines PNG 2 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-07 TOK404 - Jun 7, 11:10 UTCJun 7, 11:50 UTC40m
2026-06-07 TOK412 OKD → NGO Jun 7, 09:15 UTCJun 7, 10:10 UTC55m
2026-06-07 TOK412 OKD → NGO Jun 7, 07:45 UTCJun 7, 08:35 UTC50m
2026-06-07 TOK103 KIJ → OKD Jun 7, 06:20 UTCJun 7, 07:10 UTC50m
2026-06-07 TOK102 OKD → KIJ Jun 7, 03:30 UTCJun 7, 04:20 UTC50m
2026-06-07 TOK411 NGO → OKD Jun 7, 02:00 UTCJun 7, 02:55 UTC55m
2026-06-07 TOK411 NGO → OKD Jun 7, 00:39 UTCJun 7, 01:30 UTC50m
2026-06-06 TOK401 KIJ → NGO Jun 6, 22:55 UTCJun 6, 23:39 UTC45m
2026-06-06 TOK404 - Jun 6, 11:09 UTCJun 6, 11:49 UTC40m
2026-06-06 TOK412 OKD → NGO Jun 6, 07:50 UTCJun 6, 10:04 UTC2h 15m
2026-06-06 TOK103 KIJ → OKD Jun 6, 06:30 UTCJun 6, 07:20 UTC50m
2026-06-06 TOK102 OKD → KIJ Jun 6, 03:40 UTCJun 6, 04:30 UTC50m
2026-06-06 TOK411 NGO → OKD Jun 6, 02:10 UTCJun 6, 03:00 UTC50m
2026-06-06 TOK411 NGO → OKD Jun 6, 00:55 UTCJun 6, 01:40 UTC45m
2026-06-05 TOK401 KIJ → NGO Jun 5, 23:10 UTCJun 5, 23:50 UTC40m
2026-06-05 TOK404 - Jun 5, 11:10 UTCJun 5, 11:50 UTC40m
2026-06-05 TOK412 OKD → NGO Jun 5, 09:15 UTCJun 5, 10:05 UTC50m
2026-06-05 TOK412 OKD → NGO Jun 5, 07:45 UTCJun 5, 08:35 UTC50m
2026-06-05 TOK103 KIJ → OKD Jun 5, 06:20 UTCJun 5, 07:10 UTC50m
2026-06-05 TOK102 OKD → KIJ Jun 5, 03:30 UTCJun 5, 04:30 UTC1h 0m
2026-06-05 TOK411 NGO → OKD Jun 5, 02:10 UTCJun 5, 02:55 UTC45m
2026-06-05 TOK411 NGO → OKD Jun 5, 00:45 UTCJun 5, 01:35 UTC50m
2026-06-04 TOK401 KIJ → NGO Jun 4, 22:55 UTCJun 4, 23:45 UTC50m
2026-06-04 TOK102 OKD → KIJ Jun 4, 04:15 UTCJun 4, 05:10 UTC55m
2026-06-04 TOK411 NGO → OKD Jun 4, 02:45 UTCJun 4, 03:30 UTC45m
2026-06-04 TOK411 NGO → OKD Jun 4, 01:15 UTCJun 4, 02:10 UTC55m
2026-06-03 TOK401 KIJ → NGO Jun 3, 23:30 UTCJun 4, 00:15 UTC45m
2026-06-03 TOK102 OKD → KIJ Jun 3, 07:10 UTCJun 3, 08:00 UTC50m
2026-06-03 TOK411 NGO → OKD Jun 3, 05:45 UTCJun 3, 06:35 UTC50m
2026-06-03 TOK411 NGO → OKD Jun 3, 04:15 UTCJun 3, 05:15 UTC1h 0m
2026-06-03 TOK401 KIJ → NGO Jun 3, 02:40 UTCJun 3, 03:20 UTC40m
2026-06-01 TOK404 - Jun 1, 11:00 UTCJun 1, 11:40 UTC40m
2026-06-01 TOK412 OKD → NGO Jun 1, 09:10 UTCJun 1, 10:05 UTC55m
2026-06-01 TOK412 OKD → NGO Jun 1, 07:35 UTCJun 1, 08:30 UTC55m
2026-06-01 TOK103 KIJ → OKD Jun 1, 06:20 UTCJun 1, 07:05 UTC45m
2026-06-01 TOK102 OKD → KIJ Jun 1, 03:25 UTCJun 1, 04:20 UTC55m
2026-06-01 TOK411 NGO → OKD Jun 1, 02:00 UTCJun 1, 02:45 UTC45m
2026-06-01 TOK411 NGO → OKD Jun 1, 00:35 UTCJun 1, 01:30 UTC55m
2026-05-31 TOK401 KIJ → NGO May 31, 22:55 UTCMay 31, 23:35 UTC40m
2026-05-31 TOK411 NGO → OKD May 31, 00:45 UTCMay 31, 01:11 UTC26m
2026-05-30 TOK401 KIJ → NGO May 30, 22:55 UTCMay 30, 23:35 UTC40m
2026-05-30 TOK404 - May 30, 11:00 UTCMay 30, 11:40 UTC40m
2026-05-30 TOK412 OKD → NGO May 30, 09:15 UTCMay 30, 10:05 UTC50m
2026-05-30 TOK412 OKD → NGO May 30, 07:50 UTCMay 30, 08:40 UTC50m
2026-05-30 TOK103 KIJ → OKD May 30, 06:10 UTCMay 30, 07:00 UTC50m
2026-05-30 TOK502 - May 30, 02:35 UTCMay 30, 03:25 UTC50m
2026-05-30 TOK501 KIJ → UKB May 30, 00:40 UTCMay 30, 01:55 UTC1h 15m
2026-05-29 TOK404 - May 29, 11:25 UTCMay 29, 12:00 UTC35m
2026-05-29 TOK412 OKD → NGO May 29, 09:25 UTCMay 29, 10:15 UTC50m
2026-05-29 TOK412 OKD → NGO May 29, 07:55 UTCMay 29, 08:45 UTC50m

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 JA01QQ page for operator, model, and routing details .

Mode-S 840646 frequently asked

What is Mode-S code 840646?
840646 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA01QQ.
Where is Mode-S 840646 registered?
Mode-S code 840646 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 840646 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 840646, octal 41003106, decimal 8,652,358.
What flights does 840646 operate?
Mode-S 840646 has broadcast 12 distinct callsigns, including TOK411, TOK412, TOK401, TOK103, TOK404.