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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 50m ago
Flights observed
372
Distinct callsigns
15
Country
JP
Last broadcast
50m 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 15 distinct

Callsign Airline Flights Last seen
TOK411 Airlines PNG 81 2026-07-24
TOK412 Airlines PNG 68 2026-07-24
TOK401 Airlines PNG 46 2026-07-23
TOK102 Airlines PNG 44 2026-07-24
TOK103 Airlines PNG 40 2026-07-24
TOK404 - 39 2026-07-24
TOK502 - 12 2026-07-19
TOK501 Airlines PNG 12 2026-07-19
TOK504 Airlines PNG 11 2026-07-18
TOK503 Airlines PNG 10 2026-07-18
JA01QQ - 3 2026-04-23
TOKK411 - 2 2026-06-11
TOK9502 Airlines PNG 2 2026-05-25
TOK408 - 1 2026-07-23
TOK407 - 1 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 TOK404 - Jul 24, 11:15 UTCJul 24, 11:30 UTC15m
2026-07-24 TOK412 OKD → NGO Jul 24, 09:30 UTCJul 24, 10:15 UTC45m
2026-07-24 TOK412 OKD → NGO Jul 24, 08:05 UTCJul 24, 08:50 UTC45m
2026-07-24 TOK103 KIJ → OKD Jul 24, 06:30 UTCJul 24, 07:20 UTC50m
2026-07-24 TOK102 OKD → KIJ Jul 24, 03:40 UTCJul 24, 04:20 UTC40m
2026-07-24 TOK411 NGO → OKD Jul 24, 02:15 UTCJul 24, 03:00 UTC45m
2026-07-24 TOK411 NGO → OKD Jul 24, 00:50 UTCJul 24, 01:40 UTC50m
2026-07-23 TOK401 KIJ → NGO Jul 23, 23:00 UTCJul 23, 23:40 UTC40m
2026-07-23 TOK408 - Jul 23, 07:50 UTCJul 23, 08:30 UTC40m
2026-07-23 TOK407 - Jul 23, 06:00 UTCJul 23, 06:40 UTC40m
2026-07-20 TOK404 - Jul 20, 11:05 UTCJul 20, 11:50 UTC45m
2026-07-20 TOK412 OKD → NGO Jul 20, 09:20 UTCJul 20, 10:05 UTC45m
2026-07-20 TOK412 OKD → NGO Jul 20, 07:45 UTCJul 20, 08:35 UTC50m
2026-07-20 TOK103 KIJ → OKD Jul 20, 06:20 UTCJul 20, 07:05 UTC45m
2026-07-20 TOK102 OKD → KIJ Jul 20, 03:25 UTCJul 20, 04:15 UTC50m
2026-07-20 TOK411 NGO → OKD Jul 20, 02:05 UTCJul 20, 02:50 UTC45m
2026-07-20 TOK411 NGO → OKD Jul 20, 00:40 UTCJul 20, 01:30 UTC50m
2026-07-19 TOK401 KIJ → NGO Jul 19, 22:55 UTCJul 19, 23:35 UTC40m
2026-07-19 TOK404 - Jul 19, 11:05 UTCJul 19, 11:45 UTC40m
2026-07-19 TOK412 OKD → NGO Jul 19, 09:20 UTCJul 19, 10:10 UTC50m
2026-07-19 TOK412 OKD → NGO Jul 19, 07:50 UTCJul 19, 08:40 UTC50m
2026-07-19 TOK103 KIJ → OKD Jul 19, 06:30 UTCJul 19, 07:20 UTC50m
2026-07-19 TOK502 - Jul 19, 02:40 UTCJul 19, 03:45 UTC1h 5m
2026-07-19 TOK501 KIJ → UKB Jul 19, 00:35 UTCJul 19, 01:45 UTC1h 10m
2026-07-18 TOK504 UKB → KIJ Jul 18, 08:10 UTCJul 18, 09:00 UTC50m
2026-07-18 TOK503 KIJ → UKB Jul 18, 06:20 UTCJul 18, 07:35 UTC1h 15m
2026-07-18 TOK102 - Jul 18, 03:45 UTCJul 18, 04:40 UTC55m
2026-07-18 TOK411 - Jul 18, 02:19 UTCJul 18, 03:05 UTC46m
2026-07-18 TOK411 - Jul 18, 00:55 UTCJul 18, 01:39 UTC45m
2026-07-17 TOK401 KIJ → NGO Jul 17, 22:55 UTCJul 17, 23:45 UTC50m
2026-07-17 TOK504 UKB → KIJ Jul 17, 08:15 UTCJul 17, 08:59 UTC45m
2026-07-17 TOK503 KIJ → UKB Jul 17, 06:20 UTCJul 17, 07:30 UTC1h 10m
2026-07-17 TOK102 - Jul 17, 03:39 UTCJul 17, 04:29 UTC50m
2026-07-17 TOK411 - Jul 17, 02:20 UTCJul 17, 03:05 UTC45m
2026-07-17 TOK411 - Jul 17, 00:50 UTCJul 17, 01:45 UTC55m
2026-07-16 TOK401 - Jul 16, 22:55 UTCJul 16, 23:40 UTC45m
2026-07-13 TOK404 - Jul 13, 11:10 UTCJul 13, 11:55 UTC45m
2026-07-13 TOK412 - Jul 13, 09:30 UTCJul 13, 10:05 UTC35m
2026-07-13 TOK412 - Jul 13, 08:05 UTCJul 13, 08:50 UTC45m
2026-07-13 TOK103 - Jul 13, 06:35 UTCJul 13, 07:25 UTC50m
2026-07-13 TOK502 - Jul 13, 02:30 UTCJul 13, 03:40 UTC1h 10m
2026-07-13 TOK501 - Jul 13, 00:40 UTCJul 13, 01:55 UTC1h 15m
2026-07-12 TOK404 - Jul 12, 11:15 UTCJul 12, 12:01 UTC45m
2026-07-12 TOK412 - Jul 12, 09:25 UTCJul 12, 10:01 UTC35m
2026-07-12 TOK412 - Jul 12, 07:50 UTCJul 12, 08:40 UTC50m
2026-07-12 TOK103 - Jul 12, 06:30 UTCJul 12, 07:15 UTC45m
2026-07-12 TOK502 - Jul 12, 02:30 UTCJul 12, 03:35 UTC1h 5m
2026-07-12 TOK501 - Jul 12, 00:40 UTCJul 12, 01:55 UTC1h 15m
2026-07-11 TOK504 - Jul 11, 08:10 UTCJul 11, 08:55 UTC45m
2026-07-11 TOK503 - Jul 11, 06:15 UTCJul 11, 07:25 UTC1h 10m

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 50m 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 15 distinct callsigns, including TOK411, TOK412, TOK401, TOK102, TOK103.