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sensors Mode-S transponder

8515C4

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA329J · BOEING 737-800

Hex
8515C4
Octal
41212704
Decimal
8,721,860
Country
JP
Tail
JA329J
Type
B738
Broadcasting now · callsign JAL614 · 26,975 ft
Flights observed
570
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 13:20 UTC

Current position

8515C4 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 8515C4 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
JA329J - 16 2026-05-23
JAL262 - 9 2026-07-20
JAL263 Japan Airlines 8 2026-07-20
JAL668 - 7 2026-07-16
JAL663 - 7 2026-07-16
JAL486 - 6 2026-07-20
JAL485 Japan Airlines 6 2026-07-20
JAL498 - 5 2026-07-21
JAL443 Japan Airlines 5 2026-07-23
JAL430 Japan Airlines 5 2026-07-23
JAL2465 Japan Airlines 5 2026-07-18
JAL187 Japan Airlines 5 2026-06-09
JAL687 Japan Airlines 4 2026-06-08
JAL672 - 4 2026-07-23
JAL670 Japan Airlines 4 2026-07-21
JAL667 Japan Airlines 4 2026-07-23
JAL665 Japan Airlines 4 2026-07-21
JAL599 - 4 2026-07-06
JAL590 - 4 2026-07-06
JAL565 - 4 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JAL674 OIT → HND Jul 26, 12:10 UTCJul 26, 13:10 UTC1h 0m
2026-07-26 JAL669 HND → OIT Jul 26, 09:15 UTCJul 26, 10:20 UTC1h 5m
2026-07-26 JAL436 MYJ → HND Jul 26, 06:35 UTCJul 26, 07:45 UTC1h 10m
2026-07-26 JAL435 HND → MYJ Jul 26, 03:25 UTCJul 26, 04:25 UTC1h 0m
2026-07-26 JAL234 OKJ → HND Jul 26, 01:15 UTCJul 26, 02:20 UTC1h 5m
2026-07-25 JAL231 HND → OKJ Jul 25, 23:30 UTCJul 26, 00:15 UTC45m
2026-07-25 JAL150 AOJ → HND Jul 25, 12:05 UTCJul 25, 13:00 UTC55m
2026-07-25 JAL149 HND → AOJ Jul 25, 10:05 UTCJul 25, 10:55 UTC50m
2026-07-25 JAL614 NGS → HND Jul 25, 07:35 UTCJul 25, 09:00 UTC1h 25m
2026-07-25 JAL611 HND → NGS Jul 25, 04:45 UTCJul 25, 06:10 UTC1h 25m
2026-07-25 JAL494 KCZ → HND Jul 25, 02:40 UTCJul 25, 03:40 UTC1h 0m
2026-07-25 JAL493 HND → KCZ Jul 25, 00:35 UTCJul 25, 01:15 UTC40m
2026-07-24 JAL490 KCZ → HND Jul 24, 22:35 UTCJul 24, 23:25 UTC50m
2026-07-24 JAL499 HND → KCZ Jul 24, 11:00 UTCJul 24, 11:40 UTC40m
2026-07-24 JAL574 OBO → HND Jul 24, 08:00 UTCJul 24, 09:50 UTC1h 50m
2026-07-24 JAL577 HND → OBO Jul 24, 05:10 UTCJul 24, 06:15 UTC1h 5m
2026-07-24 JAL434 MYJ → HND Jul 24, 02:55 UTCJul 24, 04:05 UTC1h 10m
2026-07-24 JAL433 HND → MYJ Jul 24, 00:55 UTCJul 24, 01:55 UTC1h 0m
2026-07-23 JAL430 MYJ → HND Jul 23, 22:30 UTCJul 23, 23:40 UTC1h 10m
2026-07-23 JAL443 HND → MYJ Jul 23, 11:15 UTCJul 23, 12:10 UTC55m
2026-07-23 JAL672 - Jul 23, 08:40 UTCJul 23, 09:55 UTC1h 15m
2026-07-23 JAL667 HND → OIT Jul 23, 06:30 UTCJul 23, 07:25 UTC55m
2026-07-23 JAL456 TKS → HND Jul 23, 03:35 UTCJul 23, 04:40 UTC1h 5m
2026-07-23 JAL455B - Jul 23, 01:50 UTCJul 23, 02:40 UTC50m
2026-07-22 JAL662M - Jul 22, 22:50 UTCJul 23, 00:00 UTC1h 10m
2026-07-22 JL671 - Jul 22, 11:30 UTCJul 22, 12:30 UTC1h 0m
2026-07-22 JAL214 SHM → HND Jul 22, 05:10 UTCJul 22, 05:25 UTC15m
2026-07-22 JAL215 HND → SHM Jul 22, 03:10 UTCJul 22, 03:45 UTC35m
2026-07-22 JAL254 HIJ → HND Jul 22, 00:40 UTCJul 22, 01:55 UTC1h 15m
2026-07-21 JAL253 HND → HIJ Jul 21, 22:40 UTCJul 21, 23:40 UTC1h 0m
2026-07-21 JAL498 - Jul 21, 10:35 UTCJul 21, 11:20 UTC45m
2026-07-21 JAL497 HND → KCZ Jul 21, 08:25 UTCJul 21, 09:10 UTC45m
2026-07-21 JAL670 OIT → HND Jul 21, 06:05 UTCJul 21, 07:20 UTC1h 15m
2026-07-21 JAL665 HND → OIT Jul 21, 03:45 UTCJul 21, 04:45 UTC1h 0m
2026-07-21 JAL562 MMB → HND Jul 21, 00:35 UTCJul 21, 02:10 UTC1h 35m
2026-07-20 JAL565 HND → MMB Jul 20, 22:20 UTCJul 20, 23:45 UTC1h 25m
2026-07-20 JAL486 - Jul 20, 12:10 UTCJul 20, 13:10 UTC1h 0m
2026-07-20 JAL485 HND → TAK Jul 20, 10:20 UTCJul 20, 11:10 UTC50m
2026-07-20 JAL262 - Jul 20, 07:55 UTCJul 20, 09:10 UTC1h 15m
2026-07-20 JAL263 HND → HIJ Jul 20, 05:55 UTCJul 20, 06:55 UTC1h 0m
2026-07-20 JAL456 - Jul 20, 03:35 UTCJul 20, 04:40 UTC1h 5m
2026-07-20 JAL455B - Jul 20, 01:45 UTCJul 20, 02:30 UTC45m
2026-07-19 JAL662M - Jul 19, 22:55 UTCJul 20, 00:05 UTC1h 10m
2026-07-19 JAL671 - Jul 19, 11:35 UTCJul 19, 12:40 UTC1h 5m
2026-07-19 JAL148 - Jul 19, 09:20 UTCJul 19, 10:30 UTC1h 10m
2026-07-19 JAL147 - Jul 19, 07:30 UTCJul 19, 08:20 UTC50m
2026-07-19 JAL118 ITM → HND Jul 19, 04:35 UTCJul 19, 05:25 UTC50m
2026-07-19 JAL3912 CTS → ITM Jul 19, 01:35 UTCJul 19, 03:10 UTC1h 35m
2026-07-18 JAL3911 ITM → CTS Jul 18, 22:45 UTCJul 19, 00:15 UTC1h 30m
2026-07-18 JAL2092 OKA → ITM Jul 18, 09:45 UTCJul 18, 11:45 UTC2h 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 JA329J page for operator, model, and routing details .

Mode-S 8515C4 frequently asked

What is Mode-S code 8515C4?
8515C4 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA329J.
Where is Mode-S 8515C4 registered?
Mode-S code 8515C4 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8515C4 broadcasting right now?
Yes. Mode-S 8515C4 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8515C4, octal 41212704, decimal 8,721,860.
What flights does 8515C4 operate?
Mode-S 8515C4 has broadcast 20 distinct callsigns, including JA329J, JAL262, JAL263, JAL668, JAL663.