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sensors Mode-S transponder

8681BA

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA73NU · BOEING 737-800

Hex
8681BA
Octal
41500672
Decimal
8,815,034
Country
JP
Tail
JA73NU
Type
B738
Broadcasting now · callsign SKY767 · 39,000 ft
Flights observed
565
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 12:25 UTC

Current position

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

Country allocation

The ICAO 24-bit address 8681BA 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
SKY593 Skymark Airlines 9 2026-07-26
SKY112 Skymark Airlines 9 2026-07-20
SKY765 - 8 2026-07-21
SKY794 Skymark Airlines 7 2026-07-21
SKY595 Skymark Airlines 7 2026-07-25
SKY187 - 7 2026-07-21
SKY184 - 7 2026-07-20
SKY100 - 7 2026-07-16
SKY007 - 7 2026-07-14
SKY795 - 6 2026-07-02
SKY720 - 6 2026-07-13
SKY717 - 6 2026-07-13
SKY714 Skymark Airlines 6 2026-07-24
SKY711 Skymark Airlines 6 2026-07-24
SKY532 - 6 2026-07-02
SKY523 Skymark Airlines 6 2026-07-20
SKY520 - 6 2026-07-06
SKY513 - 6 2026-07-06
SKY303 - 6 2026-06-23
SKY170 Skymark Airlines 6 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKY508 OKA → FUK Jul 26, 12:10 UTCJul 26, 12:25 UTC15m
2026-07-26 SKY508 OKA → FUK Jul 26, 11:20 UTCJul 26, 11:30 UTC10m
2026-07-26 SKY509 FUK → OKA Jul 26, 09:50 UTCJul 26, 10:05 UTC15m
2026-07-26 SKY509 FUK → OKA Jul 26, 08:55 UTCJul 26, 09:05 UTC10m
2026-07-26 SKY506 OKA → FUK Jul 26, 06:20 UTCJul 26, 07:40 UTC1h 21m
2026-07-26 SKY593 UKB → OKA Jul 26, 04:25 UTCJul 26, 04:40 UTC15m
2026-07-26 SKY593 UKB → OKA Jul 26, 03:05 UTCJul 26, 03:35 UTC30m
2026-07-26 SKY153 SDJ → UKB Jul 26, 01:10 UTCJul 26, 02:10 UTC1h 0m
2026-07-25 SKY152 UKB → SDJ Jul 25, 22:55 UTCJul 25, 23:50 UTC55m
2026-07-25 SKY598 OKA → UKB Jul 25, 11:40 UTCJul 25, 13:15 UTC1h 35m
2026-07-25 SKY595 UKB → OKA Jul 25, 10:20 UTCJul 25, 10:30 UTC10m
2026-07-25 SKY595 UKB → OKA Jul 25, 08:55 UTCJul 25, 09:30 UTC35m
2026-07-25 SKY172 CTS → UKB Jul 25, 06:20 UTCJul 25, 07:50 UTC1h 30m
2026-07-25 SKY793 IBR → CTS Jul 25, 04:05 UTCJul 25, 05:15 UTC1h 10m
2026-07-25 SKY792 CTS → IBR Jul 25, 02:10 UTCJul 25, 03:10 UTC1h 0m
2026-07-24 SKY173 UKB → CTS Jul 24, 23:45 UTCJul 25, 01:20 UTC1h 35m
2026-07-24 SKY157 - Jul 24, 10:50 UTCJul 24, 11:45 UTC55m
2026-07-24 SKY156 UKB → SDJ Jul 24, 08:50 UTCJul 24, 09:40 UTC50m
2026-07-24 SKY109 HND → UKB Jul 24, 07:05 UTCJul 24, 07:55 UTC50m
2026-07-24 SKY714 CTS → HND Jul 24, 04:45 UTCJul 24, 06:00 UTC1h 15m
2026-07-24 SKY711 HND → CTS Jul 24, 02:30 UTCJul 24, 03:45 UTC1h 15m
2026-07-24 SKY102 UKB → HND Jul 24, 00:30 UTCJul 24, 01:25 UTC55m
2026-07-23 SKY101 HND → UKB Jul 23, 22:35 UTCJul 23, 23:25 UTC50m
2026-07-23 SKY726 - Jul 23, 10:40 UTCJul 23, 11:55 UTC1h 15m
2026-07-23 SKY723 - Jul 23, 08:25 UTCJul 23, 09:40 UTC1h 15m
2026-07-23 SKY518 OKA → HND Jul 23, 04:45 UTCJul 23, 07:00 UTC2h 15m
2026-07-23 SKY501 FUK → OKA Jul 23, 00:20 UTCJul 23, 00:35 UTC15m
2026-07-22 SKY501 FUK → OKA Jul 22, 23:25 UTCJul 22, 23:35 UTC10m
2026-07-22 SKY508 OKA → FUK Jul 22, 11:10 UTCJul 22, 12:05 UTC55m
2026-07-22 SKY593 UKB → OKA Jul 22, 04:55 UTCJul 22, 05:10 UTC15m
2026-07-22 SKY593 UKB → OKA Jul 22, 03:30 UTCJul 22, 04:05 UTC35m
2026-07-22 SKY153 SDJ → UKB Jul 22, 01:10 UTCJul 22, 02:10 UTC1h 0m
2026-07-21 SKY152 - Jul 21, 23:00 UTCJul 21, 23:50 UTC50m
2026-07-21 SKY187 - Jul 21, 10:55 UTCJul 21, 12:00 UTC1h 5m
2026-07-21 SKY794 CTS → IBR Jul 21, 09:05 UTCJul 21, 10:10 UTC1h 5m
2026-07-21 SKY765 - Jul 21, 06:45 UTCJul 21, 08:10 UTC1h 25m
2026-07-21 SKY636 KOJ → NGO Jul 21, 04:55 UTCJul 21, 05:30 UTC35m
2026-07-20 SKY131 UKB → KOJ Jul 20, 23:50 UTCJul 21, 00:20 UTC30m
2026-07-20 SKY590 OKA → UKB Jul 20, 21:25 UTCJul 20, 23:00 UTC1h 35m
2026-07-20 SKY523 HND → OKA Jul 20, 09:45 UTCJul 20, 11:50 UTC2h 5m
2026-07-20 SKY112 UKB → HND Jul 20, 07:30 UTCJul 20, 08:40 UTC1h 10m
2026-07-20 SKY185 - Jul 20, 05:40 UTCJul 20, 06:35 UTC55m
2026-07-20 SKY184 - Jul 20, 03:50 UTCJul 20, 04:40 UTC50m
2026-07-20 SKY170 CTS → UKB Jul 20, 01:10 UTCJul 20, 02:50 UTC1h 40m
2026-07-19 SKY171 - Jul 19, 22:35 UTCJul 20, 00:05 UTC1h 30m
2026-07-19 SKY598 OKA → UKB Jul 19, 11:45 UTCJul 19, 13:20 UTC1h 35m
2026-07-19 SKY595 - Jul 19, 10:30 UTCJul 19, 10:40 UTC10m
2026-07-19 SKY595 - Jul 19, 09:05 UTCJul 19, 09:40 UTC35m
2026-07-19 SKY172 - Jul 19, 06:30 UTCJul 19, 08:10 UTC1h 40m
2026-07-19 SKY793 - Jul 19, 04:10 UTCJul 19, 05:20 UTC1h 10m

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 JA73NU page for operator, model, and routing details .

Mode-S 8681BA frequently asked

What is Mode-S code 8681BA?
8681BA is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA73NU.
Where is Mode-S 8681BA registered?
Mode-S code 8681BA is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8681BA broadcasting right now?
Yes. Mode-S 8681BA is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8681BA, octal 41500672, decimal 8,815,034.
What flights does 8681BA operate?
Mode-S 8681BA has broadcast 20 distinct callsigns, including SKY593, SKY112, SKY765, SKY794, SKY595.