Apparatus

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sensors Mode-S transponder

8681B0

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA73NJ · BOEING 737-800

Hex
8681B0
Octal
41500660
Decimal
8,815,024
Country
JP
Tail
JA73NJ
Type
B738
No current signal · last broadcast Jul 26, 11:25 UTC
Flights observed
544
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 11:25 UTC

Last known position

Most recent position reported by Mode-S 8681B0.

Country allocation

The ICAO 24-bit address 8681B0 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
SKY513 Skymark Airlines 10 2026-07-25
SKY593 - 9 2026-07-18
SKY520 Skymark Airlines 9 2026-07-26
SKY509 - 9 2026-07-18
SKY552 Skymark Airlines 8 2026-07-26
SKY501 Skymark Airlines 8 2026-07-19
SKY791 - 7 2026-07-01
SKY775 - 7 2026-07-01
SKY300 - 7 2026-07-01
SKY176 - 7 2026-07-01
SKY153 - 7 2026-07-18
SKY152 - 7 2026-07-17
SKY117 Skymark Airlines 7 2026-07-17
SKY009 - 7 2026-07-16
SKY004 - 7 2026-07-16
SKY836 - 6 2026-06-30
SKY831 - 6 2026-06-30
SKY762 - 6 2026-06-29
SKY761 - 6 2026-06-28
SKY726 - 6 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKY520 OKA → HND Jul 26, 09:20 UTCJul 26, 11:25 UTC2h 5m
2026-07-26 SKY557 NGO → OKA Jul 26, 05:15 UTCJul 26, 06:50 UTC1h 36m
2026-07-26 SKY552 OKA → NGO Jul 26, 02:30 UTCJul 26, 04:05 UTC1h 35m
2026-07-25 SKY513 HND → OKA Jul 25, 23:10 UTCJul 26, 01:25 UTC2h 15m
2026-07-25 SKY520 OKA → HND Jul 25, 08:40 UTCJul 25, 10:50 UTC2h 10m
2026-07-25 SKY557 NGO → OKA Jul 25, 05:25 UTCJul 25, 07:00 UTC1h 35m
2026-07-25 SKY552 OKA → NGO Jul 25, 03:45 UTCJul 25, 04:10 UTC25m
2026-07-25 SKY552 OKA → NGO Jul 25, 02:25 UTCJul 25, 02:40 UTC15m
2026-07-24 SKY513 HND → OKA Jul 24, 23:15 UTCJul 25, 01:20 UTC2h 5m
2026-07-24 SKY520 OKA → HND Jul 24, 09:00 UTCJul 24, 11:25 UTC2h 25m
2026-07-24 SKY505 FUK → OKA Jul 24, 05:20 UTCJul 24, 06:35 UTC1h 15m
2026-07-24 SKY504 OKA → FUK Jul 24, 03:20 UTCJul 24, 03:45 UTC25m
2026-07-24 SKY504 OKA → FUK Jul 24, 02:30 UTCJul 24, 02:45 UTC15m
2026-07-23 SKY513 HND → OKA Jul 23, 23:00 UTCJul 24, 01:05 UTC2h 5m
2026-07-23 SKY520 OKA → HND Jul 23, 08:15 UTCJul 23, 10:30 UTC2h 15m
2026-07-23 SKY557 - Jul 23, 05:25 UTCJul 23, 07:00 UTC1h 35m
2026-07-23 SKY552 OKA → NGO Jul 23, 02:25 UTCJul 23, 04:10 UTC1h 45m
2026-07-22 SKY513 HND → OKA Jul 22, 23:05 UTCJul 23, 01:10 UTC2h 5m
2026-07-22 SKY517 HND → OKA Jul 22, 04:20 UTCJul 22, 10:25 UTC6h 5m
2026-07-22 SKY106 UKB → HND Jul 22, 02:05 UTCJul 22, 03:05 UTC1h 0m
2026-07-22 SKY103 HND → UKB Jul 22, 00:20 UTCJul 22, 01:10 UTC50m
2026-07-21 SKY100 UKB → HND Jul 21, 22:25 UTCJul 21, 23:15 UTC50m
2026-07-21 SKY598 OKA → UKB Jul 21, 12:10 UTCJul 21, 13:40 UTC1h 30m
2026-07-21 SKY595 - Jul 21, 10:35 UTCJul 21, 10:55 UTC20m
2026-07-21 SKY595 - Jul 21, 09:15 UTCJul 21, 09:45 UTC30m
2026-07-21 SKY172 - Jul 21, 06:45 UTCJul 21, 08:15 UTC1h 30m
2026-07-21 SKY793 - Jul 21, 04:10 UTCJul 21, 05:20 UTC1h 10m
2026-07-21 SKY792 - Jul 21, 02:15 UTCJul 21, 03:15 UTC1h 0m
2026-07-20 SKY173 - Jul 20, 23:45 UTCJul 21, 01:20 UTC1h 35m
2026-07-20 SKY157 - Jul 20, 10:55 UTCJul 20, 12:00 UTC1h 5m
2026-07-20 SKY156 - Jul 20, 08:55 UTCJul 20, 09:45 UTC50m
2026-07-20 SKY109 HND → UKB Jul 20, 07:00 UTCJul 20, 08:00 UTC1h 0m
2026-07-20 SKY714 - Jul 20, 04:35 UTCJul 20, 05:50 UTC1h 15m
2026-07-20 SKY711 HND → CTS Jul 20, 02:30 UTCJul 20, 03:45 UTC1h 15m
2026-07-20 SKY102 - Jul 20, 00:25 UTCJul 20, 01:25 UTC1h 0m
2026-07-19 SKY101 - Jul 19, 22:35 UTCJul 19, 23:25 UTC50m
2026-07-19 SKY726 - Jul 19, 10:40 UTCJul 19, 11:55 UTC1h 15m
2026-07-19 SKY723 - Jul 19, 08:25 UTCJul 19, 09:40 UTC1h 15m
2026-07-19 SKY518 OKA → HND Jul 19, 04:45 UTCJul 19, 07:00 UTC2h 15m
2026-07-19 SKY501 FUK → OKA Jul 19, 00:25 UTCJul 19, 00:40 UTC15m
2026-07-18 SKY501 FUK → OKA Jul 18, 23:25 UTCJul 18, 23:40 UTC15m
2026-07-18 SKY508 OKA → FUK Jul 18, 10:45 UTCJul 18, 11:55 UTC1h 10m
2026-07-18 SKY509 - Jul 18, 09:30 UTCJul 18, 09:45 UTC15m
2026-07-18 SKY509 - Jul 18, 08:35 UTCJul 18, 08:50 UTC15m
2026-07-18 SKY506 - Jul 18, 06:20 UTCJul 18, 07:30 UTC1h 10m
2026-07-18 SKY593 - Jul 18, 04:30 UTCJul 18, 04:45 UTC15m
2026-07-18 SKY593 - Jul 18, 03:10 UTCJul 18, 03:50 UTC40m
2026-07-18 SKY153 - Jul 18, 01:10 UTCJul 18, 02:14 UTC1h 5m
2026-07-17 SKY152 - Jul 17, 22:55 UTCJul 17, 23:45 UTC50m
2026-07-17 SKY117 HND → UKB Jul 17, 11:39 UTCJul 17, 12:30 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 JA73NJ page for operator, model, and routing details .

Mode-S 8681B0 frequently asked

What is Mode-S code 8681B0?
8681B0 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA73NJ.
Where is Mode-S 8681B0 registered?
Mode-S code 8681B0 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8681B0 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 11:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8681B0, octal 41500660, decimal 8,815,024.
What flights does 8681B0 operate?
Mode-S 8681B0 has broadcast 20 distinct callsigns, including SKY513, SKY593, SKY520, SKY509, SKY552.