Apparatus

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sensors Mode-S transponder

851CEC

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA349J · BOEING 737-800

Hex
851CEC
Octal
41216354
Decimal
8,723,692
Country
JP
Tail
JA349J
Type
B738
No current signal · last broadcast Jul 26, 14:15 UTC
Flights observed
585
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 14:15 UTC

Last known position

Most recent position reported by Mode-S 851CEC.

Country allocation

The ICAO 24-bit address 851CEC 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
JAL3406 Japan Airlines 9 2026-07-26
JAL465 Japan Airlines 8 2026-07-25
JAL3513 Japan Airlines 8 2026-07-26
JAL2016 - 8 2026-07-12
JAL599 Japan Airlines 7 2026-07-26
JAL520 Japan Airlines 7 2026-07-25
JAL496 - 7 2026-07-18
JAL495 - 7 2026-07-18
JAL452 Japan Airlines 7 2026-07-25
JAL378 - 7 2026-07-18
JAL377 - 7 2026-07-18
JAL3510 Japan Airlines 7 2026-07-25
JAL309 Japan Airlines 7 2026-07-26
JAL264 Japan Airlines 7 2026-07-26
JAL144 Japan Airlines 7 2026-07-18
JAL143 - 7 2026-07-18
JAL672 - 6 2026-07-19
JAL667 - 6 2026-07-19
JAL610 - 6 2026-07-17
JAL607 - 6 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JAL599 HND → CTS Jul 26, 13:00 UTCJul 26, 14:15 UTC1h 15m
2026-07-26 JAL264 HIJ → HND Jul 26, 10:35 UTCJul 26, 11:40 UTC1h 5m
2026-07-26 JAL3406 CTS → HIJ Jul 26, 06:30 UTCJul 26, 08:05 UTC1h 36m
2026-07-26 JAL3513 FUK → CTS Jul 26, 03:15 UTCJul 26, 05:30 UTC2h 15m
2026-07-26 JAL309 HND → FUK Jul 26, 00:25 UTCJul 26, 01:45 UTC1h 20m
2026-07-25 JAL452 TKS → HND Jul 25, 22:15 UTCJul 25, 23:10 UTC55m
2026-07-25 JAL465 HND → TKS Jul 25, 11:50 UTCJul 25, 12:40 UTC50m
2026-07-25 JAL520 CTS → HND Jul 25, 09:15 UTCJul 25, 10:35 UTC1h 20m
2026-07-25 JAL3515 FUK → CTS Jul 25, 05:35 UTCJul 25, 07:30 UTC1h 55m
2026-07-25 JAL3510 CTS → FUK Jul 25, 01:50 UTCJul 25, 03:45 UTC1h 55m
2026-07-24 JAL3101 NGO → CTS Jul 24, 23:30 UTCJul 25, 00:45 UTC1h 15m
2026-07-24 JAL209 HND → NGO Jul 24, 12:35 UTCJul 24, 13:00 UTC25m
2026-07-24 JAL438 MYJ → HND Jul 24, 09:50 UTCJul 24, 11:20 UTC1h 30m
2026-07-24 JAL437 HND → MYJ Jul 24, 07:40 UTCJul 24, 08:35 UTC55m
2026-07-24 JAL480 TAK → HND Jul 24, 05:10 UTCJul 24, 06:20 UTC1h 10m
2026-07-24 JAL479 HND → TAK Jul 24, 03:05 UTCJul 24, 03:55 UTC50m
2026-07-24 JAL278 IZO → HND Jul 24, 00:40 UTCJul 24, 01:50 UTC1h 10m
2026-07-23 JAL277 HND → IZO Jul 23, 22:30 UTCJul 23, 23:20 UTC50m
2026-07-23 JAL464 TKS → HND Jul 23, 11:50 UTCJul 23, 12:50 UTC1h 0m
2026-07-23 JAL463 HND → TKS Jul 23, 09:45 UTCJul 23, 10:35 UTC50m
2026-07-23 JAL632 KMJ → HND Jul 23, 07:10 UTCJul 23, 08:35 UTC1h 25m
2026-07-23 JAL631 HND → KMJ Jul 23, 04:35 UTCJul 23, 05:55 UTC1h 20m
2026-07-23 JAL626 KMJ → HND Jul 23, 01:50 UTCJul 23, 03:15 UTC1h 25m
2026-07-22 JAL625 HND → KMJ Jul 22, 23:35 UTCJul 23, 00:55 UTC1h 20m
2026-07-22 JAL286 IZO → HND Jul 22, 11:10 UTCJul 22, 11:35 UTC25m
2026-07-22 JAL459 HND → TKS Jul 22, 04:15 UTCJul 22, 05:05 UTC50m
2026-07-22 JAL664H - Jul 22, 01:40 UTCJul 22, 02:50 UTC1h 10m
2026-07-21 JAL661 HND → OIT Jul 21, 23:30 UTCJul 22, 00:30 UTC1h 0m
2026-07-21 JAL150 AOJ → HND Jul 21, 11:55 UTCJul 21, 12:45 UTC50m
2026-07-21 JAL149 - Jul 21, 10:05 UTCJul 21, 11:00 UTC55m
2026-07-21 JAL614 NGS → HND Jul 21, 07:20 UTCJul 21, 08:50 UTC1h 30m
2026-07-21 JAL611 HND → NGS Jul 21, 05:00 UTCJul 21, 06:25 UTC1h 25m
2026-07-21 JAL494 KCZ → HND Jul 21, 00:30 UTCJul 21, 03:35 UTC3h 5m
2026-07-20 JAL490 KCZ → HND Jul 20, 22:30 UTCJul 20, 23:20 UTC50m
2026-07-20 JAL499 - Jul 20, 10:25 UTCJul 20, 11:05 UTC40m
2026-07-20 JAL574 - Jul 20, 07:35 UTCJul 20, 08:50 UTC1h 15m
2026-07-20 JAL577 - Jul 20, 05:15 UTCJul 20, 06:20 UTC1h 5m
2026-07-20 JAL434 MYJ → HND Jul 20, 02:55 UTCJul 20, 04:00 UTC1h 5m
2026-07-20 JAL433 HND → MYJ Jul 20, 00:45 UTCJul 20, 01:45 UTC1h 0m
2026-07-19 JAL430 - Jul 19, 22:20 UTCJul 19, 23:35 UTC1h 15m
2026-07-19 JAL443 - Jul 19, 11:15 UTCJul 19, 12:10 UTC55m
2026-07-19 JAL672 - Jul 19, 08:30 UTCJul 19, 09:55 UTC1h 25m
2026-07-19 JAL667 - Jul 19, 06:15 UTCJul 19, 07:15 UTC1h 0m
2026-07-19 JAL456 - Jul 19, 03:35 UTCJul 19, 04:35 UTC1h 0m
2026-07-19 JAL455B - Jul 19, 01:50 UTCJul 19, 02:35 UTC45m
2026-07-18 JAL378 - Jul 18, 12:35 UTCJul 18, 13:50 UTC1h 15m
2026-07-18 JAL377 - Jul 18, 10:20 UTCJul 18, 11:20 UTC1h 0m
2026-07-18 JAL496 - Jul 18, 07:55 UTCJul 18, 08:50 UTC55m
2026-07-18 JAL495 - Jul 18, 05:45 UTCJul 18, 06:25 UTC40m
2026-07-18 JAL144 AOJ → HND Jul 18, 03:40 UTCJul 18, 04:30 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 JA349J page for operator, model, and routing details .

Mode-S 851CEC frequently asked

What is Mode-S code 851CEC?
851CEC is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA349J.
Where is Mode-S 851CEC registered?
Mode-S code 851CEC is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 851CEC broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 851CEC, octal 41216354, decimal 8,723,692.
What flights does 851CEC operate?
Mode-S 851CEC has broadcast 20 distinct callsigns, including JAL3406, JAL465, JAL3513, JAL2016, JAL599.