Apparatus

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sensors Mode-S transponder

840D6E

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA03QQ

Hex
840D6E
Octal
41006556
Decimal
8,654,190
Country
JP
Tail
JA03QQ
Type
AT46
No current signal · last broadcast 17h ago
Flights observed
139
Distinct callsigns
12
Country
JP
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S 840D6E.

Country allocation

The ICAO 24-bit address 840D6E 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
TOK503 Airlines PNG 24 2026-05-29
TOK504 Airlines PNG 22 2026-05-29
TOK502 - 22 2026-05-29
TOK501 Airlines PNG 22 2026-05-29
TOK412 Airlines PNG 14 2026-05-27
TOK404 - 11 2026-05-27
TOK411 Airlines PNG 7 2026-05-21
TOK103 Airlines PNG 7 2026-05-27
TOK401 Airlines PNG 4 2026-05-20
TOK102 Airlines PNG 4 2026-05-21
TOK901 - 1 2026-05-27
TOK5310 - 1 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 TOK504 UKB → KIJ May 29, 08:10 UTCMay 29, 09:05 UTC55m
2026-05-29 TOK503 KIJ → UKB May 29, 06:15 UTCMay 29, 07:30 UTC1h 15m
2026-05-29 TOK502 - May 29, 02:40 UTCMay 29, 03:35 UTC55m
2026-05-29 TOK501 KIJ → UKB May 29, 00:35 UTCMay 29, 02:05 UTC1h 30m
2026-05-28 TOK5310 - May 28, 01:10 UTCMay 28, 02:15 UTC1h 5m
2026-05-27 TOK901 - May 27, 23:00 UTCMay 28, 00:15 UTC1h 15m
2026-05-27 TOK404 - May 27, 06:44 UTCMay 27, 07:20 UTC36m
2026-05-27 TOK412 OKD → NGO May 27, 04:30 UTCMay 27, 05:19 UTC50m
2026-05-27 TOK412 OKD → NGO May 27, 02:59 UTCMay 27, 03:50 UTC50m
2026-05-27 TOK103 KIJ → OKD May 27, 01:34 UTCMay 27, 02:19 UTC45m
2026-05-26 TOK404 - May 26, 06:39 UTCMay 26, 07:19 UTC40m
2026-05-26 TOK412 OKD → NGO May 26, 03:00 UTCMay 26, 05:15 UTC2h 15m
2026-05-26 TOK103 KIJ → OKD May 26, 01:24 UTCMay 26, 02:15 UTC50m
2026-05-25 TOK504 UKB → KIJ May 25, 08:20 UTCMay 25, 09:15 UTC55m
2026-05-25 TOK503 KIJ → UKB May 25, 06:25 UTCMay 25, 07:35 UTC1h 10m
2026-05-25 TOK502 - May 25, 02:35 UTCMay 25, 03:40 UTC1h 5m
2026-05-24 TOK504 UKB → KIJ May 24, 08:25 UTCMay 24, 09:25 UTC1h 0m
2026-05-24 TOK503 KIJ → UKB May 24, 06:20 UTCMay 24, 07:30 UTC1h 10m
2026-05-24 TOK502 - May 24, 02:25 UTCMay 24, 03:30 UTC1h 5m
2026-05-24 TOK501 KIJ → UKB May 24, 00:30 UTCMay 24, 01:40 UTC1h 10m
2026-05-23 TOK504 UKB → KIJ May 23, 08:15 UTCMay 23, 09:10 UTC55m
2026-05-23 TOK503 KIJ → UKB May 23, 06:15 UTCMay 23, 07:40 UTC1h 25m
2026-05-23 TOK502 - May 23, 02:40 UTCMay 23, 03:40 UTC1h 0m
2026-05-23 TOK501 KIJ → UKB May 23, 00:40 UTCMay 23, 01:50 UTC1h 10m
2026-05-22 TOK504 UKB → KIJ May 22, 08:10 UTCMay 22, 09:05 UTC55m
2026-05-22 TOK503 KIJ → UKB May 22, 06:20 UTCMay 22, 07:30 UTC1h 10m
2026-05-22 TOK502 - May 22, 02:45 UTCMay 22, 03:45 UTC1h 0m
2026-05-22 TOK501 KIJ → UKB May 22, 00:40 UTCMay 22, 01:55 UTC1h 15m
2026-05-21 TOK102 OKD → KIJ May 21, 04:15 UTCMay 21, 05:05 UTC50m
2026-05-21 TOK411 NGO → OKD May 21, 01:25 UTCMay 21, 03:30 UTC2h 5m
2026-05-20 TOK401 KIJ → NGO May 20, 23:40 UTCMay 21, 00:30 UTC50m
2026-05-18 TOK504 UKB → KIJ May 18, 08:05 UTCMay 18, 08:55 UTC50m
2026-05-18 TOK503 KIJ → UKB May 18, 06:20 UTCMay 18, 07:25 UTC1h 5m
2026-05-18 TOK502 - May 18, 02:30 UTCMay 18, 03:30 UTC1h 0m
2026-05-18 TOK501 KIJ → UKB May 18, 00:35 UTCMay 18, 01:45 UTC1h 10m
2026-05-15 TOK504 UKB → KIJ May 15, 08:15 UTCMay 15, 09:20 UTC1h 5m
2026-05-15 TOK503 KIJ → UKB May 15, 06:10 UTCMay 15, 07:15 UTC1h 5m
2026-05-15 TOK502 - May 15, 02:45 UTCMay 15, 03:50 UTC1h 5m
2026-05-15 TOK501 KIJ → UKB May 15, 00:35 UTCMay 15, 01:45 UTC1h 10m
2026-05-14 TOK102 OKD → KIJ May 14, 04:35 UTCMay 14, 05:15 UTC40m
2026-05-14 TOK411 NGO → OKD May 14, 03:15 UTCMay 14, 04:00 UTC45m
2026-05-14 TOK411 NGO → OKD May 14, 01:55 UTCMay 14, 02:40 UTC45m
2026-05-13 TOK401 KIJ → NGO May 13, 23:30 UTCMay 14, 00:10 UTC40m
2026-05-13 TOK404 - May 13, 06:50 UTCMay 13, 07:30 UTC40m
2026-05-13 TOK412 OKD → NGO May 13, 04:35 UTCMay 13, 05:15 UTC40m
2026-05-13 TOK412 OKD → NGO May 13, 02:55 UTCMay 13, 03:40 UTC45m
2026-05-13 TOK103 KIJ → OKD May 13, 01:25 UTCMay 13, 02:15 UTC50m
2026-05-12 TOK404 - May 12, 06:40 UTCMay 12, 07:20 UTC40m
2026-05-12 TOK412 OKD → NGO May 12, 02:55 UTCMay 12, 05:25 UTC2h 30m
2026-05-11 TOK504 UKB → KIJ May 11, 08:25 UTCMay 11, 09:25 UTC1h 0m

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 JA03QQ page for operator, model, and routing details .

Mode-S 840D6E frequently asked

What is Mode-S code 840D6E?
840D6E is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA03QQ.
Where is Mode-S 840D6E registered?
Mode-S code 840D6E is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 840D6E broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 840D6E, octal 41006556, decimal 8,654,190.
What flights does 840D6E operate?
Mode-S 840D6E has broadcast 12 distinct callsigns, including TOK503, TOK504, TOK502, TOK501, TOK412.