Apparatus

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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
Broadcasting now · callsign SKY594 · 8,900 ft
Flights observed
474
Distinct callsigns
20
Country
JP
Last broadcast
2h ago

Current position

8681AC is currently broadcasting. Map zoomed to live position.

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
SKY519 - 8 2026-06-16
SKY002 - 8 2026-07-01
SKY027 - 7 2026-07-01
SKY835 Skymark Airlines 6 2026-05-14
SKY141 - 6 2026-06-20
SKY015 - 6 2026-07-08
SKY790 - 5 2026-07-10
SKY775 Skymark Airlines 5 2026-05-15
SKY720 - 5 2026-07-09
SKY719 - 5 2026-06-19
SKY717 - 5 2026-07-09
SKY703 - 5 2026-07-09
SKY597 - 5 2026-06-27
SKY596 Skymark Airlines 5 2026-05-09
SKY517 - 5 2026-07-14
SKY514 - 5 2026-06-18
SKY510 - 5 2026-07-07
SKY309 - 5 2026-07-08
SKY302 - 5 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKY517 - Jul 14, 04:10 UTCJul 14, 06:15 UTC2h 5m
2026-07-14 SKY106 - Jul 14, 02:05 UTCJul 14, 03:00 UTC55m
2026-07-14 SKY103 HND → UKB Jul 14, 00:25 UTCJul 14, 01:10 UTC45m
2026-07-13 SKY100 - Jul 13, 22:25 UTCJul 13, 23:30 UTC1h 5m
2026-07-13 SKY598 OKA → UKB Jul 13, 11:40 UTCJul 13, 13:15 UTC1h 35m
2026-07-13 SKY595 - Jul 13, 10:10 UTCJul 13, 10:30 UTC20m
2026-07-13 SKY595 - Jul 13, 08:55 UTCJul 13, 09:30 UTC35m
2026-07-13 SKY172 - Jul 13, 06:30 UTCJul 13, 07:55 UTC1h 25m
2026-07-13 SKY793 - Jul 13, 04:10 UTCJul 13, 05:20 UTC1h 10m
2026-07-13 SKY792 - Jul 13, 02:20 UTCJul 13, 03:15 UTC55m
2026-07-12 SKY173 - Jul 12, 23:45 UTCJul 13, 01:25 UTC1h 40m
2026-07-12 SKY187 - Jul 12, 11:25 UTCJul 12, 12:20 UTC55m
2026-07-12 SKY794 - Jul 12, 09:40 UTCJul 12, 10:40 UTC1h 0m
2026-07-12 SKY765 - Jul 12, 07:10 UTCJul 12, 08:40 UTC1h 30m
2026-07-12 SKY636 - Jul 12, 05:05 UTCJul 12, 05:50 UTC45m
2026-07-11 SKY131 - Jul 11, 23:50 UTCJul 12, 00:20 UTC30m
2026-07-11 SKY590 - Jul 11, 21:25 UTCJul 11, 23:00 UTC1h 35m
2026-07-11 SKY523 - Jul 11, 10:30 UTCJul 11, 12:30 UTC2h 0m
2026-07-11 SKY112 - Jul 11, 07:25 UTCJul 11, 08:30 UTC1h 5m
2026-07-11 SKY185 - Jul 11, 05:20 UTCJul 11, 06:25 UTC1h 5m
2026-07-11 SKY184 - Jul 11, 03:30 UTCJul 11, 04:30 UTC1h 0m
2026-07-11 SKY170 - Jul 11, 01:10 UTCJul 11, 02:40 UTC1h 30m
2026-07-10 SKY171 - Jul 10, 22:35 UTCJul 11, 00:15 UTC1h 40m
2026-07-10 SKY178 - Jul 10, 12:00 UTCJul 10, 13:40 UTC1h 40m
2026-07-10 SKY795 - Jul 10, 09:55 UTCJul 10, 11:10 UTC1h 15m
2026-07-10 SKY790 - Jul 10, 00:05 UTCJul 10, 01:15 UTC1h 10m
2026-07-09 SKY703 - Jul 9, 22:05 UTCJul 9, 23:15 UTC1h 10m
2026-07-09 SKY026 FUK → HND Jul 9, 12:25 UTCJul 9, 13:45 UTC1h 20m
2026-07-09 SKY025 - Jul 9, 10:10 UTCJul 9, 11:10 UTC1h 0m
2026-07-09 SKY720 - Jul 9, 07:50 UTCJul 9, 09:10 UTC1h 20m
2026-07-09 SKY717 - Jul 9, 05:25 UTCJul 9, 06:45 UTC1h 20m
2026-07-08 SKY302 - Jul 8, 21:45 UTCJul 9, 01:55 UTC4h 10m
2026-07-08 SKY638 KOJ → NGO Jul 8, 12:45 UTCJul 8, 13:30 UTC45m
2026-07-08 SKY309 - Jul 8, 10:20 UTCJul 8, 11:25 UTC1h 5m
2026-07-08 SKY018 - Jul 8, 07:50 UTCJul 8, 09:10 UTC1h 20m
2026-07-08 SKY015 - Jul 8, 05:05 UTCJul 8, 06:35 UTC1h 30m
2026-07-07 SKY510 - Jul 7, 22:30 UTCJul 8, 00:35 UTC2h 5m
2026-07-07 SKY523 - Jul 7, 09:45 UTCJul 7, 11:50 UTC2h 5m
2026-07-07 SKY112 UKB → HND Jul 7, 07:20 UTCJul 7, 08:10 UTC50m
2026-07-07 SKY185 - Jul 7, 05:20 UTCJul 7, 06:10 UTC50m
2026-07-07 SKY184 - Jul 7, 03:30 UTCJul 7, 04:30 UTC1h 0m
2026-07-07 SKY170 - Jul 7, 01:10 UTCJul 7, 02:40 UTC1h 30m
2026-07-06 SKY171 - Jul 6, 22:40 UTCJul 7, 00:20 UTC1h 40m
2026-07-06 SKY598 OKA → UKB Jul 6, 11:45 UTCJul 6, 13:15 UTC1h 30m
2026-07-06 SKY595 - Jul 6, 10:10 UTCJul 6, 10:25 UTC15m
2026-07-06 SKY595 - Jul 6, 08:45 UTCJul 6, 09:20 UTC35m
2026-07-06 SKY172 - Jul 6, 06:20 UTCJul 6, 07:55 UTC1h 35m
2026-07-06 SKY793 - Jul 6, 04:15 UTCJul 6, 05:25 UTC1h 10m
2026-07-06 SKY792 - Jul 6, 02:25 UTCJul 6, 03:25 UTC1h 0m
2026-07-05 SKY173 - Jul 5, 23:45 UTCJul 6, 01:30 UTC1h 45m

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?
Yes. Mode-S 8681AC is currently airborne.
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, SKY519, SKY002, SKY027, SKY835.