Apparatus

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sensors Mode-S transponder

8681A8

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA73NA · BOEING 737-800

Hex
8681A8
Octal
41500650
Decimal
8,815,016
Country
JP
Tail
JA73NA
Type
B738
No current signal · last broadcast 2h ago
Flights observed
481
Distinct callsigns
20
Country
JP
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 8681A8.

Country allocation

The ICAO 24-bit address 8681A8 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
SKY309 - 9 2026-07-09
SKY593 - 8 2026-07-04
SKY302 - 8 2026-07-10
SKY712 - 7 2026-07-11
SKY509 - 7 2026-07-04
SKY178 - 7 2026-06-28
SKY175 - 7 2026-07-11
SKY147 - 7 2026-07-10
SKY140 - 7 2026-07-10
SKY117 Skymark Airlines 7 2026-07-03
SKY113 - 7 2026-07-10
SKY795 - 6 2026-06-28
SKY638 Skymark Airlines 6 2026-07-09
SKY532 - 6 2026-06-28
SKY521 - 6 2026-07-07
SKY301 - 6 2026-06-27
SKY185 - 6 2026-06-29
SKY184 - 6 2026-06-29
SKY170 - 6 2026-06-29
SKY153 - 6 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKY177 - Jul 14, 03:40 UTCJul 14, 05:20 UTC1h 40m
2026-07-14 SKY592 - Jul 14, 01:15 UTCJul 14, 02:50 UTC1h 35m
2026-07-13 SKY511 - Jul 13, 21:45 UTCJul 13, 23:40 UTC1h 55m
2026-07-13 SKY026 FUK → HND Jul 13, 12:40 UTCJul 13, 14:05 UTC1h 25m
2026-07-13 SKY025 - Jul 13, 10:10 UTCJul 13, 11:15 UTC1h 5m
2026-07-12 SKY300 - Jul 12, 22:35 UTCJul 12, 23:50 UTC1h 15m
2026-07-12 SKY137 UKB → KOJ Jul 12, 11:30 UTCJul 12, 12:05 UTC35m
2026-07-12 SKY176 - Jul 12, 09:15 UTCJul 12, 10:40 UTC1h 25m
2026-07-12 SKY775 - Jul 12, 06:01 UTCJul 12, 08:05 UTC2h 5m
2026-07-12 SKY772 - Jul 12, 02:10 UTCJul 12, 03:55 UTC1h 45m
2026-07-12 SKY791 - Jul 12, 00:01 UTCJul 12, 01:10 UTC1h 10m
2026-07-11 SKY186 - Jul 11, 10:45 UTCJul 11, 11:35 UTC50m
2026-07-11 SKY174 - Jul 11, 08:20 UTCJul 11, 09:55 UTC1h 35m
2026-07-11 SKY719 - Jul 11, 06:01 UTCJul 11, 07:20 UTC1h 20m
2026-07-11 SKY712 - Jul 11, 03:01 UTCJul 11, 04:10 UTC1h 10m
2026-07-11 SKY175 - Jul 11, 00:30 UTCJul 11, 02:05 UTC1h 35m
2026-07-10 SKY140 - Jul 10, 22:45 UTCJul 10, 23:35 UTC50m
2026-07-10 SKY147 - Jul 10, 10:55 UTCJul 10, 11:50 UTC55m
2026-07-10 SKY113 - Jul 10, 09:20 UTCJul 10, 10:10 UTC50m
2026-07-10 SKY014 - Jul 10, 05:55 UTCJul 10, 07:25 UTC1h 30m
2026-07-10 SKY011 - Jul 10, 03:05 UTCJul 10, 04:10 UTC1h 5m
2026-07-10 SKY302 - Jul 10, 00:40 UTCJul 10, 01:55 UTC1h 15m
2026-07-09 SKY635 - Jul 9, 21:45 UTCJul 9, 22:30 UTC45m
2026-07-09 SKY638 KOJ → NGO Jul 9, 12:55 UTCJul 9, 13:35 UTC40m
2026-07-09 SKY309 - Jul 9, 10:35 UTCJul 9, 11:40 UTC1h 5m
2026-07-09 SKY018 - Jul 9, 07:45 UTCJul 9, 09:30 UTC1h 45m
2026-07-09 SKY015 - Jul 9, 05:00 UTCJul 9, 06:20 UTC1h 20m
2026-07-09 SKY304 - Jul 9, 02:40 UTCJul 9, 03:55 UTC1h 15m
2026-07-09 SKY303 - Jul 9, 00:00 UTCJul 9, 01:05 UTC1h 5m
2026-07-08 SKY022 - Jul 8, 10:00 UTCJul 8, 11:25 UTC1h 25m
2026-07-08 SKY021 - Jul 8, 07:35 UTCJul 8, 08:40 UTC1h 5m
2026-07-08 SKY012 - Jul 8, 05:10 UTCJul 8, 06:40 UTC1h 30m
2026-07-08 SKY009 - Jul 8, 02:45 UTCJul 8, 03:45 UTC1h 0m
2026-07-08 SKY004 - Jul 8, 00:15 UTCJul 8, 01:35 UTC1h 20m
2026-07-07 SKY001 - Jul 7, 21:35 UTCJul 7, 22:45 UTC1h 10m
2026-07-07 SKY522 OKA → HND Jul 7, 11:55 UTCJul 7, 14:00 UTC2h 5m
2026-07-07 SKY521 - Jul 7, 08:30 UTCJul 7, 10:30 UTC2h 0m
2026-07-07 SKY716 - Jul 7, 06:00 UTCJul 7, 07:15 UTC1h 15m
2026-07-07 SKY713 - Jul 7, 03:45 UTCJul 7, 05:00 UTC1h 15m
2026-07-06 SKY510 - Jul 6, 22:30 UTCJul 7, 00:30 UTC2h 0m
2026-07-06 SKY599 UKB → OKA Jul 6, 14:10 UTCJul 6, 14:25 UTC15m
2026-07-06 SKY599 UKB → OKA Jul 6, 12:50 UTCJul 6, 13:20 UTC30m
2026-07-06 SKY596 - Jul 6, 10:20 UTCJul 6, 11:50 UTC1h 30m
2026-07-06 SKY519 - Jul 6, 09:00 UTCJul 6, 09:10 UTC10m
2026-07-06 SKY519 - Jul 6, 07:05 UTCJul 6, 07:50 UTC45m
2026-07-06 SKY008 - Jul 6, 03:35 UTCJul 6, 04:45 UTC1h 10m
2026-07-06 SKY007 - Jul 6, 00:55 UTCJul 6, 02:05 UTC1h 10m
2026-07-05 SKY002 - Jul 5, 22:15 UTCJul 5, 23:35 UTC1h 20m
2026-07-05 SKY027 - Jul 5, 11:15 UTCJul 5, 12:25 UTC1h 10m
2026-07-05 SKY518 - Jul 5, 06:10 UTCJul 5, 08:25 UTC2h 15m

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 JA73NA page for operator, model, and routing details .

Mode-S 8681A8 frequently asked

What is Mode-S code 8681A8?
8681A8 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA73NA.
Where is Mode-S 8681A8 registered?
Mode-S code 8681A8 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8681A8 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8681A8, octal 41500650, decimal 8,815,016.
What flights does 8681A8 operate?
Mode-S 8681A8 has broadcast 20 distinct callsigns, including SKY309, SKY593, SKY302, SKY712, SKY509.