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sensors Mode-S transponder

8681B7

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA73NR · BOEING 737-800

Hex
8681B7
Octal
41500667
Decimal
8,815,031
Country
JP
Tail
JA73NR
Type
B738
No current signal · last broadcast Jul 26, 14:25 UTC
Flights observed
556
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 14:25 UTC

Last known position

Most recent position reported by Mode-S 8681B7.

Country allocation

The ICAO 24-bit address 8681B7 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
SKY762 - 9 2026-07-06
SKY761 - 9 2026-07-05
SKY591 Skymark Airlines 9 2026-07-26
SKY593 - 8 2026-07-07
SKY520 - 8 2026-07-16
SKY513 - 8 2026-07-15
SKY503 Skymark Airlines 8 2026-07-26
SKY727 - 7 2026-07-10
SKY637 - 7 2026-07-06
SKY518 - 7 2026-07-08
SKY021 - 7 2026-06-28
SKY768 - 6 2026-07-10
SKY726 - 6 2026-07-08
SKY723 - 6 2026-07-08
SKY718 - 6 2026-07-10
SKY558 Skymark Airlines 6 2026-07-03
SKY501 - 6 2026-07-08
SKY309 - 6 2026-07-05
SKY177 - 6 2026-07-10
SKY153 - 6 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKY729 HND → CTS Jul 26, 13:10 UTCJul 26, 14:25 UTC1h 15m
2026-07-26 SKY618 SHI → HND Jul 26, 10:00 UTCJul 26, 12:10 UTC2h 10m
2026-07-26 SKY547 OKA → SHI Jul 26, 06:50 UTCJul 26, 07:00 UTC10m
2026-07-26 SKY503 FUK → OKA Jul 26, 05:30 UTCJul 26, 05:45 UTC15m
2026-07-26 SKY503 FUK → OKA Jul 26, 04:35 UTCJul 26, 04:45 UTC10m
2026-07-26 SKY502 OKA → FUK Jul 26, 01:25 UTCJul 26, 02:30 UTC1h 5m
2026-07-26 SKY591 UKB → OKA Jul 26, 00:05 UTCJul 26, 00:20 UTC15m
2026-07-25 SKY591 UKB → OKA Jul 25, 22:45 UTCJul 25, 23:25 UTC40m
2026-07-25 SKY187 IBR → UKB Jul 25, 10:55 UTCJul 25, 12:00 UTC1h 5m
2026-07-25 SKY794 CTS → IBR Jul 25, 09:00 UTCJul 25, 10:05 UTC1h 5m
2026-07-25 SKY765 NGO → CTS Jul 25, 06:40 UTCJul 25, 08:10 UTC1h 30m
2026-07-25 SKY636 KOJ → NGO Jul 25, 05:00 UTCJul 25, 05:35 UTC35m
2026-07-24 SKY131 UKB → KOJ Jul 24, 23:50 UTCJul 25, 00:25 UTC35m
2026-07-24 SKY590 OKA → UKB Jul 24, 21:20 UTCJul 24, 22:55 UTC1h 35m
2026-07-24 SKY523 HND → OKA Jul 24, 11:15 UTCJul 24, 13:20 UTC2h 5m
2026-07-24 SKY018 FUK → HND Jul 24, 08:15 UTCJul 24, 09:50 UTC1h 35m
2026-07-24 SKY015 HND → FUK Jul 24, 05:10 UTCJul 24, 06:30 UTC1h 20m
2026-07-24 SKY304 KOJ → HND Jul 24, 02:40 UTCJul 24, 03:55 UTC1h 15m
2026-07-23 SKY303 HND → KOJ Jul 23, 23:55 UTCJul 24, 01:00 UTC1h 5m
2026-07-23 SKY102 UKB → HND Jul 23, 00:50 UTCJul 23, 01:40 UTC50m
2026-07-22 SKY140 NGS → UKB Jul 22, 22:55 UTCJul 22, 23:40 UTC45m
2026-07-22 SKY147 - Jul 22, 11:15 UTCJul 22, 11:45 UTC30m
2026-07-22 SKY011 HND → FUK Jul 22, 03:10 UTCJul 22, 04:35 UTC1h 25m
2026-07-22 SKY302 KOJ → HND Jul 22, 00:40 UTCJul 22, 02:05 UTC1h 25m
2026-07-21 SKY635 - Jul 21, 21:45 UTCJul 21, 22:25 UTC40m
2026-07-21 SKY766 - Jul 21, 10:45 UTCJul 21, 12:00 UTC1h 15m
2026-07-21 SKY767 NGO → CTS Jul 21, 08:35 UTCJul 21, 09:50 UTC1h 15m
2026-07-21 SKY554 - Jul 21, 07:15 UTCJul 21, 07:25 UTC10m
2026-07-21 SKY554 - Jul 21, 05:50 UTCJul 21, 06:00 UTC10m
2026-07-21 SKY531 IBR → OKA Jul 21, 02:15 UTCJul 21, 04:30 UTC2h 15m
2026-07-21 SKY790 - Jul 21, 00:05 UTCJul 21, 01:20 UTC1h 15m
2026-07-20 SKY703 HND → CTS Jul 20, 22:05 UTCJul 20, 23:10 UTC1h 5m
2026-07-20 SKY730 - Jul 20, 12:10 UTCJul 20, 13:25 UTC1h 15m
2026-07-20 SKY179 UKB → CTS Jul 20, 09:45 UTCJul 20, 11:15 UTC1h 30m
2026-07-20 SKY148 NGS → UKB Jul 20, 07:55 UTCJul 20, 08:50 UTC55m
2026-07-20 SKY145 - Jul 20, 06:00 UTCJul 20, 06:55 UTC55m
2026-07-20 SKY105 HND → UKB Jul 20, 04:10 UTCJul 20, 05:05 UTC55m
2026-07-20 SKY710 - Jul 20, 02:00 UTCJul 20, 03:15 UTC1h 15m
2026-07-19 SKY705 HND → CTS Jul 19, 23:40 UTCJul 20, 00:50 UTC1h 10m
2026-07-19 SKY116 - Jul 19, 10:15 UTCJul 19, 11:20 UTC1h 5m
2026-07-19 SKY594 OKA → UKB Jul 19, 07:40 UTCJul 19, 09:15 UTC1h 35m
2026-07-19 SKY517 HND → OKA Jul 19, 04:05 UTCJul 19, 06:20 UTC2h 15m
2026-07-19 SKY106 - Jul 19, 02:05 UTCJul 19, 03:05 UTC1h 0m
2026-07-19 SKY103 HND → UKB Jul 19, 00:25 UTCJul 19, 01:15 UTC50m
2026-07-18 SKY100 UKB → HND Jul 18, 22:25 UTCJul 18, 23:30 UTC1h 5m
2026-07-18 SKY178 - Jul 18, 11:55 UTCJul 18, 13:25 UTC1h 30m
2026-07-18 SKY795 - Jul 18, 09:50 UTCJul 18, 11:00 UTC1h 10m
2026-07-18 SKY532 - Jul 18, 06:55 UTCJul 18, 09:00 UTC2h 5m
2026-07-18 SKY163 - Jul 18, 02:05 UTCJul 18, 03:35 UTC1h 31m
2026-07-18 SKY132 KOJ → UKB Jul 18, 00:25 UTCJul 18, 01:05 UTC40m

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 JA73NR page for operator, model, and routing details .

Mode-S 8681B7 frequently asked

What is Mode-S code 8681B7?
8681B7 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA73NR.
Where is Mode-S 8681B7 registered?
Mode-S code 8681B7 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8681B7 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8681B7, octal 41500667, decimal 8,815,031.
What flights does 8681B7 operate?
Mode-S 8681B7 has broadcast 20 distinct callsigns, including SKY762, SKY761, SKY591, SKY593, SKY520.