Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

8681AC

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA73NE · BOEING 737-800

Hex
8681AC
Octal
41500654
Decimal
8,815,020
Country
JP
Tail
JA73NE
Type
B738
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
547
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S 8681AC.

Country allocation

The ICAO 24-bit address 8681AC 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
SKY599 Skymark Airlines 9 2026-05-30
SKY002 - 9 2026-07-26
SKY519 - 8 2026-06-16
SKY027 Skymark Airlines 8 2026-07-26
SKY597 - 7 2026-07-16
SKY517 Skymark Airlines 7 2026-07-23
SKY835 Skymark Airlines 6 2026-05-14
SKY720 Skymark Airlines 6 2026-07-26
SKY717 Skymark Airlines 6 2026-07-26
SKY595 - 6 2026-07-18
SKY302 Skymark Airlines 6 2026-07-25
SKY141 - 6 2026-06-20
SKY015 - 6 2026-07-08
SKY790 - 5 2026-07-10
SKY775 Skymark Airlines 5 2026-05-15
SKY719 - 5 2026-06-19
SKY714 Skymark Airlines 5 2026-07-21
SKY712 Skymark Airlines 5 2026-07-26
SKY711 Skymark Airlines 5 2026-07-21
SKY703 - 5 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKY002 - Jul 26, 22:15 UTCJul 26, 23:00 UTC45m
2026-07-26 SKY027 HND → FUK Jul 26, 11:30 UTCJul 26, 12:35 UTC1h 5m
2026-07-26 SKY720 CTS → HND Jul 26, 08:45 UTCJul 26, 10:10 UTC1h 25m
2026-07-26 SKY717 HND → CTS Jul 26, 06:10 UTCJul 26, 07:20 UTC1h 11m
2026-07-26 SKY712 CTS → HND Jul 26, 03:15 UTCJul 26, 05:00 UTC1h 45m
2026-07-26 SKY175 UKB → CTS Jul 26, 00:40 UTCJul 26, 02:20 UTC1h 40m
2026-07-25 SKY140 NGS → UKB Jul 25, 22:55 UTCJul 25, 23:50 UTC55m
2026-07-25 SKY147 UKB → NGS Jul 25, 11:05 UTCJul 25, 11:50 UTC45m
2026-07-25 SKY113 HND → UKB Jul 25, 09:25 UTCJul 25, 10:15 UTC50m
2026-07-25 SKY014 FUK → HND Jul 25, 06:00 UTCJul 25, 07:30 UTC1h 30m
2026-07-25 SKY011 HND → FUK Jul 25, 03:05 UTCJul 25, 04:35 UTC1h 30m
2026-07-25 SKY302 KOJ → HND Jul 25, 00:40 UTCJul 25, 01:55 UTC1h 15m
2026-07-24 SKY635 NGO → KOJ Jul 24, 21:45 UTCJul 24, 22:30 UTC45m
2026-07-24 SKY768 - Jul 24, 12:20 UTCJul 24, 13:35 UTC1h 15m
2026-07-24 SKY727 HND → CTS Jul 24, 10:10 UTCJul 24, 11:25 UTC1h 15m
2026-07-24 SKY718 CTS → HND Jul 24, 07:20 UTCJul 24, 09:05 UTC1h 45m
2026-07-24 SKY177 UKB → CTS Jul 24, 03:45 UTCJul 24, 05:25 UTC1h 40m
2026-07-24 SKY592 OKA → UKB Jul 24, 01:10 UTCJul 24, 02:50 UTC1h 40m
2026-07-23 SKY511 HND → OKA Jul 23, 21:45 UTCJul 23, 23:50 UTC2h 5m
2026-07-23 SKY116 UKB → HND Jul 23, 10:15 UTCJul 23, 11:15 UTC1h 0m
2026-07-23 SKY594 OKA → UKB Jul 23, 07:40 UTCJul 23, 09:15 UTC1h 35m
2026-07-23 SKY517 HND → OKA Jul 23, 06:00 UTCJul 23, 06:15 UTC15m
2026-07-23 SKY517 HND → OKA Jul 23, 04:10 UTCJul 23, 04:50 UTC40m
2026-07-23 SKY106 UKB → HND Jul 23, 02:10 UTCJul 23, 03:10 UTC1h 0m
2026-07-23 SKY103 HND → UKB Jul 23, 00:25 UTCJul 23, 01:15 UTC50m
2026-07-22 SKY100 UKB → HND Jul 22, 22:20 UTCJul 22, 23:15 UTC55m
2026-07-22 SKY598 OKA → UKB Jul 22, 11:55 UTCJul 22, 13:25 UTC1h 30m
2026-07-22 SKY793 IBR → CTS Jul 22, 04:15 UTCJul 22, 05:25 UTC1h 10m
2026-07-22 SKY792 CTS → IBR Jul 22, 02:15 UTCJul 22, 03:15 UTC1h 0m
2026-07-21 SKY173 - Jul 21, 23:50 UTCJul 22, 01:20 UTC1h 30m
2026-07-21 SKY157 - Jul 21, 10:40 UTCJul 21, 11:40 UTC1h 0m
2026-07-21 SKY156 - Jul 21, 08:40 UTCJul 21, 09:30 UTC50m
2026-07-21 SKY109 HND → UKB Jul 21, 06:50 UTCJul 21, 07:40 UTC50m
2026-07-21 SKY714 CTS → HND Jul 21, 04:35 UTCJul 21, 05:50 UTC1h 15m
2026-07-21 SKY711 HND → CTS Jul 21, 02:30 UTCJul 21, 03:40 UTC1h 10m
2026-07-21 SKY102 UKB → HND Jul 21, 00:20 UTCJul 21, 01:20 UTC1h 0m
2026-07-20 SKY101 HND → UKB Jul 20, 22:35 UTCJul 20, 23:25 UTC50m
2026-07-20 SKY520 OKA → HND Jul 20, 08:10 UTCJul 20, 10:15 UTC2h 5m
2026-07-20 SKY557 - Jul 20, 05:25 UTCJul 20, 07:00 UTC1h 35m
2026-07-20 SKY552 - Jul 20, 03:45 UTCJul 20, 04:10 UTC25m
2026-07-20 SKY552 - Jul 20, 02:30 UTCJul 20, 02:45 UTC15m
2026-07-19 SKY513 HND → OKA Jul 19, 23:15 UTCJul 20, 01:20 UTC2h 5m
2026-07-19 SKY618 - Jul 19, 08:40 UTCJul 19, 10:55 UTC2h 15m
2026-07-19 SKY503 - Jul 19, 05:25 UTCJul 19, 05:45 UTC20m
2026-07-19 SKY503 - Jul 19, 04:30 UTCJul 19, 04:45 UTC15m
2026-07-19 SKY502 OKA → FUK Jul 19, 01:30 UTCJul 19, 02:30 UTC1h 0m
2026-07-19 SKY591 - Jul 19, 00:05 UTCJul 19, 00:20 UTC15m
2026-07-18 SKY591 - Jul 18, 22:45 UTCJul 18, 23:20 UTC35m
2026-07-18 SKY598 OKA → UKB Jul 18, 11:50 UTCJul 18, 13:25 UTC1h 35m
2026-07-18 SKY595 - Jul 18, 10:20 UTCJul 18, 10:40 UTC20m

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 JA73NE page for operator, model, and routing details .

Mode-S 8681AC frequently asked

What is Mode-S code 8681AC?
8681AC is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA73NE.
Where is Mode-S 8681AC registered?
Mode-S code 8681AC is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8681AC broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8681AC, octal 41500654, decimal 8,815,020.
What flights does 8681AC operate?
Mode-S 8681AC has broadcast 20 distinct callsigns, including SKY599, SKY002, SKY519, SKY027, SKY597.