Apparatus

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sensors Mode-S transponder

841BD1

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA07RK · BOEING 737-800

Hex
841BD1
Octal
41015721
Decimal
8,657,873
Country
JP
Tail
JA07RK
Type
B738
No current signal · last broadcast 7h ago
Flights observed
192
Distinct callsigns
20
Country
JP
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 841BD1.

Country allocation

The ICAO 24-bit address 841BD1 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
JTA302 Japan Transocean Air 9 2026-05-16
JTA86 Japan Transocean Air 8 2026-05-26
JTA61 Japan Transocean Air 8 2026-05-07
JTA301 Japan Transocean Air 8 2026-05-16
JTA65 Japan Transocean Air 7 2026-05-22
JTA121 Japan Transocean Air 7 2026-05-29
JTA1 - 7 2026-05-09
JTA60 Japan Transocean Air 6 2026-05-22
JTA46 Japan Transocean Air 6 2026-05-26
JTA51 Japan Transocean Air 5 2026-05-05
JTA49 Japan Transocean Air 5 2026-05-28
JTA44 Japan Transocean Air 5 2026-05-28
JTA83 Japan Transocean Air 4 2026-05-04
JTA63 Japan Transocean Air 4 2026-05-14
JTA54 Japan Transocean Air 4 2026-05-07
JTA53 Japan Transocean Air 4 2026-05-07
JTA5 - 4 2026-05-10
JTA45 Japan Transocean Air 4 2026-05-23
JTA37 Japan Transocean Air 4 2026-05-17
JAL973 Japan Airlines 4 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 JTA121 KIX → MMY May 29, 22:50 UTCMay 29, 23:30 UTC40m
2026-05-29 JTA47 NGO → OKA May 29, 06:25 UTCMay 29, 13:05 UTC6h 40m
2026-05-28 JTA49 NGO → OKA May 28, 10:05 UTCMay 28, 10:25 UTC20m
2026-05-28 JTA44 OKA → NGO May 28, 08:40 UTCMay 28, 08:55 UTC15m
2026-05-27 JTA121 KIX → MMY May 27, 22:55 UTCMay 27, 23:30 UTC35m
2026-05-26 JTA86 ISG → KIX May 26, 23:54 UTCMay 27, 13:20 UTC13h 26m
2026-05-26 JTA46 OKA → NGO May 26, 12:40 UTCMay 26, 13:04 UTC25m
2026-05-25 JTA49 NGO → OKA May 25, 10:20 UTCMay 25, 10:30 UTC10m
2026-05-24 JTA121 KIX → MMY May 24, 23:00 UTCMay 25, 09:00 UTC10h 0m
2026-05-23 JTA45 NGO → OKA May 23, 23:50 UTCMay 24, 13:20 UTC13h 30m
2026-05-23 JTA46 OKA → NGO May 23, 13:25 UTCMay 23, 13:40 UTC15m
2026-05-22 JTA65 FUK → OKA May 22, 12:05 UTCMay 22, 12:15 UTC10m
2026-05-22 JTA60 OKA → FUK May 22, 10:35 UTCMay 22, 10:45 UTC10m
2026-05-21 JTA45 NGO → OKA May 21, 23:45 UTCMay 22, 00:05 UTC20m
2026-05-21 JTA46 OKA → NGO May 21, 12:30 UTCMay 21, 12:50 UTC20m
2026-05-20 JAL973 KIX → GMP May 20, 07:55 UTCMay 20, 08:20 UTC25m
2026-05-20 JAL973 KIX → GMP May 20, 06:15 UTCMay 20, 06:50 UTC35m
2026-05-20 JAL972 GMP → KIX May 20, 04:20 UTCMay 20, 05:00 UTC41m
2026-05-19 JAL971 KIX → GMP May 19, 22:30 UTCMay 20, 03:10 UTC4h 40m
2026-05-19 JAL192 KMQ → HND May 19, 11:45 UTCMay 19, 12:35 UTC50m
2026-05-19 JAL191 HND → KMQ May 19, 10:00 UTCMay 19, 10:25 UTC25m
2026-05-19 JAL933 HND → MMY May 19, 02:10 UTCMay 19, 08:25 UTC6h 15m
2026-05-19 JAL184 KMQ → HND May 19, 00:00 UTCMay 19, 00:50 UTC50m
2026-05-18 JAL183 HND → KMQ May 18, 22:15 UTCMay 18, 22:40 UTC25m
2026-05-18 JL192 KMQ → HND May 18, 11:40 UTCMay 18, 12:30 UTC50m
2026-05-18 JL191 HND → KMQ May 18, 09:55 UTCMay 18, 10:15 UTC20m
2026-05-18 JAL933 HND → MMY May 18, 02:20 UTCMay 18, 08:30 UTC6h 10m
2026-05-17 JAL184 KMQ → HND May 17, 23:55 UTCMay 18, 00:40 UTC45m
2026-05-17 JAL183 HND → KMQ May 17, 22:25 UTCMay 17, 22:45 UTC20m
2026-05-17 JL974 GMP → KIX May 17, 10:55 UTCMay 17, 13:15 UTC2h 20m
2026-05-17 JTA37 KMQ → OKA May 17, 07:00 UTCMay 17, 07:10 UTC10m
2026-05-17 JTA37 KMQ → OKA May 17, 05:30 UTCMay 17, 06:10 UTC40m
2026-05-17 JTA36 OKA → KMQ May 17, 02:30 UTCMay 17, 04:15 UTC1h 45m
2026-05-16 JTA13 OKJ → OKA May 16, 23:50 UTCMay 17, 01:20 UTC1h 30m
2026-05-16 JTA16 OKA → OKJ May 16, 09:51 UTCMay 16, 11:21 UTC1h 30m
2026-05-16 JTA302 TPE → OKA May 16, 02:25 UTCMay 16, 02:40 UTC15m
2026-05-16 JTA301 OKA → TPE May 16, 00:30 UTCMay 16, 00:50 UTC20m
2026-05-15 JTA301 OKA → TPE May 15, 23:40 UTCMay 15, 23:55 UTC15m
2026-05-15 JTA17 OKJ → OKA May 15, 12:45 UTCMay 15, 13:00 UTC15m
2026-05-15 JTA17 OKJ → OKA May 15, 11:30 UTCMay 15, 11:55 UTC25m
2026-05-15 JTA14 OKA → OKJ May 15, 09:10 UTCMay 15, 10:45 UTC1h 35m
2026-05-14 JTA63 FUK → OKA May 14, 09:45 UTCMay 14, 10:00 UTC15m
2026-05-14 JTA58 OKA → FUK May 14, 06:20 UTCMay 14, 06:35 UTC15m
2026-05-14 JTA302 TPE → OKA May 14, 03:20 UTCMay 14, 03:30 UTC10m
2026-05-14 JTA302 TPE → OKA May 14, 02:30 UTCMay 14, 02:45 UTC15m
2026-05-14 JTA301 OKA → TPE May 14, 00:30 UTCMay 14, 00:50 UTC20m
2026-05-13 JTA301 OKA → TPE May 13, 23:45 UTCMay 14, 00:00 UTC15m
2026-05-13 JAL973 KIX → GMP May 13, 06:10 UTCMay 13, 08:35 UTC2h 25m
2026-05-12 JAL971 KIX → GMP May 12, 22:31 UTCMay 13, 05:00 UTC6h 30m
2026-05-12 JAL974 GMP → KIX May 12, 10:50 UTCMay 12, 13:00 UTC2h 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 JA07RK page for operator, model, and routing details .

Mode-S 841BD1 frequently asked

What is Mode-S code 841BD1?
841BD1 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA07RK.
Where is Mode-S 841BD1 registered?
Mode-S code 841BD1 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 841BD1 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 841BD1, octal 41015721, decimal 8,657,873.
What flights does 841BD1 operate?
Mode-S 841BD1 has broadcast 20 distinct callsigns, including JTA302, JTA86, JTA61, JTA301, JTA65.