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 Jul 26, 13:50 UTC
Flights observed
355
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 13:50 UTC

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
JTA1 - 15 2026-07-07
JTA5 - 13 2026-07-08
JTA121 - 13 2026-07-17
JTA86 Japan Transocean Air 12 2026-07-07
JTA61 - 12 2026-07-13
JTA49 Japan Transocean Air 12 2026-07-24
JTA302 - 12 2026-07-12
JTA9 - 11 2026-07-23
JTA65 - 11 2026-07-13
JTA44 Japan Transocean Air 11 2026-07-24
JTA301 - 11 2026-07-11
JTA42 - 10 2026-07-17
JTA83 Japan Transocean Air 9 2026-07-25
JTA37 Japan Transocean Air 9 2026-07-23
JTA128 - 9 2026-07-17
JTA53 - 8 2026-07-17
JTA46 - 8 2026-07-14
JTA60 - 7 2026-07-13
JTA51 Japan Transocean Air 7 2026-06-24
JTA50 - 7 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JAL193 HND → KMQ Jul 26, 13:15 UTCJul 26, 13:50 UTC35m
2026-07-26 JAL190 KMQ → HND Jul 26, 11:10 UTCJul 26, 11:55 UTC45m
2026-07-26 JAL189 HND → KIX Jul 26, 09:30 UTCJul 26, 10:10 UTC40m
2026-07-26 JAL188 KMQ → HND Jul 26, 07:30 UTCJul 26, 08:20 UTC50m
2026-07-26 JAL187 HND → KMQ Jul 26, 05:35 UTCJul 26, 06:30 UTC55m
2026-07-26 JAL186 KIX → HND Jul 26, 02:20 UTCJul 26, 03:20 UTC1h 0m
2026-07-26 JAL185 HND → KMQ Jul 26, 00:35 UTCJul 26, 01:20 UTC45m
2026-07-25 JAL232 OKJ → HND Jul 25, 22:25 UTCJul 25, 23:30 UTC1h 5m
2026-07-25 JTA16 OKA → OKJ Jul 25, 09:55 UTCJul 25, 11:25 UTC1h 30m
2026-07-25 JTA83 KIX → ISG Jul 25, 01:10 UTCJul 25, 02:45 UTC1h 35m
2026-07-24 JTA2 - Jul 24, 22:25 UTCJul 25, 00:00 UTC1h 35m
2026-07-24 JTA49 NGO → OKA Jul 24, 09:50 UTCJul 24, 11:35 UTC1h 45m
2026-07-24 JTA44 OKA → NGO Jul 24, 08:20 UTCJul 24, 08:45 UTC25m
2026-07-24 JTA44 OKA → NGO Jul 24, 07:00 UTCJul 24, 07:20 UTC20m
2026-07-24 JTA57 FUK → OKA Jul 24, 05:30 UTCJul 24, 05:50 UTC20m
2026-07-24 JTA57 FUK → OKA Jul 24, 04:30 UTCJul 24, 04:45 UTC15m
2026-07-24 JTA52 OKA → FUK Jul 24, 01:50 UTCJul 24, 03:10 UTC1h 20m
2026-07-23 JTA9 - Jul 23, 12:55 UTCJul 23, 13:10 UTC15m
2026-07-23 JTA9 - Jul 23, 11:35 UTCJul 23, 12:10 UTC35m
2026-07-23 JTA8 - Jul 23, 08:40 UTCJul 23, 10:10 UTC1h 30m
2026-07-23 JTA37 KMQ → OKA Jul 23, 06:55 UTCJul 23, 07:15 UTC20m
2026-07-23 JTA37 KMQ → OKA Jul 23, 05:20 UTCJul 23, 06:15 UTC55m
2026-07-23 JTA36 OKA → KMQ Jul 23, 02:35 UTCJul 23, 04:30 UTC1h 55m
2026-07-22 JTA13 OKJ → OKA Jul 22, 23:45 UTCJul 23, 01:20 UTC1h 35m
2026-07-22 JTA83 KIX → ISG Jul 22, 01:10 UTCJul 22, 02:40 UTC1h 30m
2026-07-21 JTA2 - Jul 21, 22:30 UTCJul 22, 00:00 UTC1h 30m
2026-07-21 JTA9 - Jul 21, 12:50 UTCJul 21, 13:05 UTC15m
2026-07-21 JTA9 - Jul 21, 11:25 UTCJul 21, 12:10 UTC45m
2026-07-21 JTA8 - Jul 21, 08:45 UTCJul 21, 10:25 UTC1h 40m
2026-07-18 JTA49 - Jul 18, 09:55 UTCJul 18, 11:30 UTC1h 35m
2026-07-18 JTA44 - Jul 18, 06:55 UTCJul 18, 08:35 UTC1h 40m
2026-07-18 JTA560 - Jul 18, 05:35 UTCJul 18, 05:45 UTC10m
2026-07-18 JTA556 - Jul 18, 02:14 UTCJul 18, 02:29 UTC15m
2026-07-17 JTA121 - Jul 17, 22:55 UTCJul 18, 00:19 UTC1h 25m
2026-07-17 JTA128 - Jul 17, 11:04 UTCJul 17, 12:50 UTC1h 45m
2026-07-17 JTA47 - Jul 17, 06:35 UTCJul 17, 08:10 UTC1h 35m
2026-07-17 JTA42 - Jul 17, 05:04 UTCJul 17, 05:20 UTC15m
2026-07-17 JTA42 - Jul 17, 03:39 UTCJul 17, 03:59 UTC20m
2026-07-17 JTA53 - Jul 17, 01:49 UTCJul 17, 02:05 UTC15m
2026-07-17 JTA53 - Jul 17, 00:55 UTCJul 17, 01:09 UTC15m
2026-07-16 JTA50 - Jul 16, 22:30 UTCJul 16, 23:40 UTC1h 10m
2026-07-16 JTA49 - Jul 16, 10:20 UTCJul 16, 11:54 UTC1h 35m
2026-07-16 JTA44 - Jul 16, 07:30 UTCJul 16, 09:05 UTC1h 35m
2026-07-16 JTA556 - Jul 16, 02:10 UTCJul 16, 02:25 UTC15m
2026-07-15 JTA121 - Jul 15, 23:00 UTCJul 16, 00:30 UTC1h 30m
2026-07-15 JTA128 - Jul 15, 11:15 UTCJul 15, 13:00 UTC1h 45m
2026-07-15 JTA47 - Jul 15, 06:05 UTCJul 15, 07:40 UTC1h 35m
2026-07-15 JTA42 - Jul 15, 03:10 UTCJul 15, 04:50 UTC1h 40m
2026-07-14 JTA45 - Jul 14, 23:45 UTCJul 15, 01:20 UTC1h 35m
2026-07-14 JTA46 - Jul 14, 11:10 UTCJul 14, 12:45 UTC1h 35m

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 Jul 26, 13:50 UTC.
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 JTA1, JTA5, JTA121, JTA86, JTA61.