Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

8681BD

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA73NX · BOEING 737-800

Hex
8681BD
Octal
41500675
Decimal
8,815,037
Country
JP
Tail
JA73NX
Type
B738
No current signal · last broadcast 1h ago
Flights observed
232
Distinct callsigns
20
Country
JP
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 8681BD.

Country allocation

The ICAO 24-bit address 8681BD 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 6 2026-06-13
SKY142 Skymark Airlines 6 2026-06-12
SKY141 Skymark Airlines 6 2026-06-12
SKY519 Skymark Airlines 5 2026-06-13
SKY183 Skymark Airlines 5 2026-06-11
SKY108 - 5 2026-06-12
SKY836 Skymark Airlines 4 2026-05-29
SKY835 Skymark Airlines 4 2026-05-29
SKY834 Skymark Airlines 4 2026-05-29
SKY831 Skymark Airlines 4 2026-05-29
SKY794 Skymark Airlines 4 2026-06-14
SKY187 Skymark Airlines 4 2026-06-14
SKY182 Skymark Airlines 4 2026-05-28
SKY157 Skymark Airlines 4 2026-06-03
SKY156 Skymark Airlines 4 2026-06-03
SKY765 Skymark Airlines 3 2026-06-14
SKY719 Skymark Airlines 3 2026-06-11
SKY714 Skymark Airlines 3 2026-05-25
SKY711 Skymark Airlines 3 2026-05-25
SKY186 Skymark Airlines 3 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-16 SKY726 CTS → HND Jun 16, 10:25 UTCJun 16, 11:15 UTC50m
2026-06-16 SKY723 - Jun 16, 08:10 UTCJun 16, 09:30 UTC1h 20m
2026-06-16 SKY518 - Jun 16, 05:55 UTCJun 16, 06:50 UTC55m
2026-06-15 SKY593 UKB → OKA Jun 15, 03:30 UTCJun 15, 04:04 UTC35m
2026-06-15 SKY153 SDJ → UKB Jun 15, 01:04 UTCJun 15, 02:10 UTC1h 5m
2026-06-14 SKY152 UKB → SDJ Jun 14, 23:00 UTCJun 14, 23:50 UTC50m
2026-06-14 SKY187 IBR → UKB Jun 14, 11:00 UTCJun 14, 12:05 UTC1h 5m
2026-06-14 SKY794 CTS → IBR Jun 14, 09:00 UTCJun 14, 10:05 UTC1h 5m
2026-06-14 SKY765 NGO → CTS Jun 14, 06:40 UTCJun 14, 08:05 UTC1h 25m
2026-06-13 SKY131 UKB → KOJ Jun 13, 23:45 UTCJun 14, 05:35 UTC5h 50m
2026-06-13 SKY599 UKB → OKA Jun 13, 12:40 UTCJun 13, 22:55 UTC10h 15m
2026-06-13 SKY519 HND → OKA Jun 13, 07:00 UTCJun 13, 11:55 UTC4h 55m
2026-06-13 SKY912 - Jun 13, 04:55 UTCJun 13, 05:55 UTC1h 0m
2026-06-13 SKY911 HND → UKB Jun 13, 02:45 UTCJun 13, 03:45 UTC1h 0m
2026-06-12 SKY599 UKB → OKA Jun 12, 13:00 UTCJun 13, 00:20 UTC11h 20m
2026-06-12 SKY519 HND → OKA Jun 12, 07:05 UTCJun 12, 12:10 UTC5h 5m
2026-06-12 SKY108 - Jun 12, 04:15 UTCJun 12, 05:25 UTC1h 10m
2026-06-12 SKY142 NGS → UKB Jun 12, 02:40 UTCJun 12, 03:25 UTC45m
2026-06-12 SKY141 UKB → NGS Jun 12, 00:45 UTCJun 12, 01:35 UTC50m
2026-06-11 SKY183 IBR → UKB Jun 11, 22:45 UTCJun 11, 23:55 UTC1h 10m
2026-06-11 SKY186 UKB → IBR Jun 11, 10:35 UTCJun 11, 11:30 UTC55m
2026-06-11 SKY174 CTS → UKB Jun 11, 08:00 UTCJun 11, 09:50 UTC1h 50m
2026-06-11 SKY719 HND → CTS Jun 11, 05:55 UTCJun 11, 07:05 UTC1h 10m
2026-06-10 SKY514 OKA → HND Jun 10, 23:10 UTCJun 11, 04:00 UTC4h 50m
2026-06-10 SKY766 NGO → CTS Jun 10, 10:35 UTCJun 10, 12:05 UTC1h 30m
2026-06-10 SKY767 NGO → CTS Jun 10, 08:25 UTCJun 10, 09:35 UTC1h 10m
2026-06-10 SKY531 IBR → OKA Jun 10, 02:10 UTCJun 10, 03:15 UTC1h 5m
2026-06-10 SKY790 CTS → IBR Jun 10, 00:00 UTCJun 10, 01:15 UTC1h 15m
2026-06-09 SKY703 HND → CTS Jun 9, 22:00 UTCJun 9, 23:05 UTC1h 5m
2026-06-09 SKY730 CTS → HND Jun 9, 12:10 UTCJun 9, 13:30 UTC1h 20m
2026-06-09 SKY179 UKB → CTS Jun 9, 09:35 UTCJun 9, 11:00 UTC1h 25m
2026-06-09 SKY148 NGS → UKB Jun 9, 08:05 UTCJun 9, 08:50 UTC45m
2026-06-09 SKY145 UKB → NGS Jun 9, 06:00 UTCJun 9, 06:50 UTC50m
2026-06-09 SKY105 HND → UKB Jun 9, 04:15 UTCJun 9, 05:05 UTC50m
2026-06-09 SKY710 CTS → HND Jun 9, 01:55 UTCJun 9, 03:20 UTC1h 25m
2026-06-08 SKY705 HND → CTS Jun 8, 23:40 UTCJun 9, 00:50 UTC1h 10m
2026-06-08 SKY116 UKB → HND Jun 8, 10:20 UTCJun 8, 11:15 UTC55m
2026-06-08 SKY517 HND → OKA Jun 8, 04:10 UTCJun 8, 09:20 UTC5h 10m
2026-06-08 SKY106 UKB → HND Jun 8, 02:10 UTCJun 8, 03:00 UTC50m
2026-06-08 SKY103 HND → UKB Jun 8, 00:25 UTCJun 8, 01:20 UTC55m
2026-06-07 SKY100 UKB → HND Jun 7, 22:20 UTCJun 7, 23:15 UTC55m
2026-06-07 SKY595 UKB → OKA Jun 7, 09:05 UTCJun 7, 13:25 UTC4h 20m
2026-06-07 SKY172 CTS → UKB Jun 7, 06:35 UTCJun 7, 08:15 UTC1h 40m
2026-06-07 SKY793 IBR → CTS Jun 7, 04:15 UTCJun 7, 05:25 UTC1h 10m
2026-06-07 SKY792 CTS → IBR Jun 7, 02:19 UTCJun 7, 03:25 UTC1h 5m
2026-06-06 SKY173 UKB → CTS Jun 6, 23:50 UTCJun 7, 01:30 UTC1h 40m
2026-06-06 SKY187 IBR → UKB Jun 6, 11:49 UTCJun 6, 12:49 UTC1h 0m
2026-06-06 SKY794 CTS → IBR Jun 6, 09:19 UTCJun 6, 10:20 UTC1h 0m
2026-06-06 SKY765 NGO → CTS Jun 6, 07:10 UTCJun 6, 08:25 UTC1h 15m
2026-06-05 SKY131 UKB → KOJ Jun 5, 23:50 UTCJun 6, 06:05 UTC6h 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 JA73NX page for operator, model, and routing details .

Mode-S 8681BD frequently asked

What is Mode-S code 8681BD?
8681BD is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA73NX.
Where is Mode-S 8681BD registered?
Mode-S code 8681BD is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8681BD broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8681BD, octal 41500675, decimal 8,815,037.
What flights does 8681BD operate?
Mode-S 8681BD has broadcast 20 distinct callsigns, including SKY599, SKY142, SKY141, SKY519, SKY183.