Apparatus

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sensors Mode-S transponder

868042

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA737Y · BOEING 737-800

Hex
868042
Octal
41500102
Decimal
8,814,658
Country
JP
Tail
JA737Y
Type
B738
No current signal · last broadcast Jul 26, 12:05 UTC
Flights observed
539
Distinct callsigns
20
Country
JP
Last broadcast
Jul 26, 12:05 UTC

Last known position

Most recent position reported by Mode-S 868042.

Country allocation

The ICAO 24-bit address 868042 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
SKY597 - 10 2026-07-20
SKY513 Skymark Airlines 8 2026-07-18
SKY593 - 7 2026-07-03
SKY591 - 7 2026-07-15
SKY508 Skymark Airlines 7 2026-07-03
SKY153 - 7 2026-07-03
SKY152 - 7 2026-07-02
SKY002 - 7 2026-07-10
SKY729 Skymark Airlines 6 2026-07-19
SKY726 - 6 2026-07-01
SKY718 - 6 2026-07-07
SKY714 - 6 2026-07-10
SKY711 - 6 2026-07-10
SKY706 Skymark Airlines 6 2026-07-19
SKY613 Skymark Airlines 6 2026-07-20
SKY552 - 6 2026-07-19
SKY520 Skymark Airlines 6 2026-07-19
SKY517 - 6 2026-06-22
SKY512 - 6 2026-07-21
SKY177 - 6 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKY766 NGO → CTS Jul 26, 10:50 UTCJul 26, 12:05 UTC1h 15m
2026-07-26 SKY767 NGO → CTS Jul 26, 08:35 UTCJul 26, 09:55 UTC1h 20m
2026-07-26 SKY554 OKA → NGO Jul 26, 07:10 UTCJul 26, 07:20 UTC10m
2026-07-26 SKY554 OKA → NGO Jul 26, 05:45 UTCJul 26, 06:05 UTC20m
2026-07-26 SKY531 IBR → OKA Jul 26, 02:20 UTCJul 26, 04:35 UTC2h 15m
2026-07-26 SKY790 CTS → IBR Jul 26, 00:10 UTCJul 26, 01:10 UTC1h 0m
2026-07-25 SKY703 HND → CTS Jul 25, 22:05 UTCJul 25, 23:15 UTC1h 10m
2026-07-25 SKY730 - Jul 25, 12:15 UTCJul 25, 13:30 UTC1h 15m
2026-07-25 SKY179 UKB → CTS Jul 25, 09:45 UTCJul 25, 11:15 UTC1h 30m
2026-07-25 SKY148 NGS → UKB Jul 25, 08:05 UTCJul 25, 08:55 UTC50m
2026-07-25 SKY145 UKB → NGS Jul 25, 06:15 UTCJul 25, 07:05 UTC50m
2026-07-25 SKY105 HND → UKB Jul 25, 04:30 UTCJul 25, 05:20 UTC50m
2026-07-25 SKY710 CTS → HND Jul 25, 02:20 UTCJul 25, 03:30 UTC1h 10m
2026-07-25 SKY705 HND → CTS Jul 25, 00:15 UTCJul 25, 01:30 UTC1h 15m
2026-07-24 SKY954 CTS → HND Jul 24, 05:15 UTCJul 24, 07:20 UTC2h 5m
2026-07-23 SKY953 HND → CTS Jul 23, 23:45 UTCJul 24, 02:00 UTC2h 15m
2026-07-23 SKY022 - Jul 23, 10:00 UTCJul 23, 11:20 UTC1h 20m
2026-07-23 SKY021 HND → FUK Jul 23, 07:35 UTCJul 23, 08:50 UTC1h 15m
2026-07-22 SKY510 OKA → HND Jul 22, 22:35 UTCJul 23, 00:35 UTC2h 0m
2026-07-22 SKY599 UKB → OKA Jul 22, 14:10 UTCJul 22, 14:20 UTC10m
2026-07-22 SKY599 UKB → OKA Jul 22, 12:50 UTCJul 22, 13:25 UTC35m
2026-07-22 SKY596 OKA → UKB Jul 22, 11:15 UTCJul 22, 11:55 UTC40m
2026-07-22 SKY712 CTS → HND Jul 22, 03:00 UTCJul 22, 04:15 UTC1h 15m
2026-07-22 SKY175 UKB → CTS Jul 22, 00:25 UTCJul 22, 01:55 UTC1h 30m
2026-07-21 SKY140 NGS → UKB Jul 21, 22:45 UTCJul 21, 23:35 UTC50m
2026-07-21 SKY147 - Jul 21, 10:55 UTCJul 21, 11:50 UTC55m
2026-07-21 SKY113 - Jul 21, 09:10 UTCJul 21, 10:05 UTC55m
2026-07-21 SKY014 FUK → HND Jul 21, 06:10 UTCJul 21, 07:45 UTC1h 35m
2026-07-21 SKY011 HND → FUK Jul 21, 03:35 UTCJul 21, 04:40 UTC1h 5m
2026-07-21 SKY512 - Jul 21, 00:20 UTCJul 21, 02:25 UTC2h 5m
2026-07-20 SKY551 - Jul 20, 21:30 UTCJul 20, 23:10 UTC1h 40m
2026-07-20 SKY558 OKA → NGO Jul 20, 12:10 UTCJul 20, 13:40 UTC1h 30m
2026-07-20 SKY597 - Jul 20, 10:55 UTCJul 20, 11:05 UTC10m
2026-07-20 SKY597 - Jul 20, 09:30 UTCJul 20, 10:10 UTC40m
2026-07-20 SKY613 HND → SHI Jul 20, 02:20 UTCJul 20, 08:35 UTC6h 15m
2026-07-19 SKY706 CTS → HND Jul 19, 23:25 UTCJul 20, 00:35 UTC1h 10m
2026-07-19 SKY729 HND → CTS Jul 19, 11:50 UTCJul 19, 13:05 UTC1h 15m
2026-07-19 SKY520 OKA → HND Jul 19, 08:05 UTCJul 19, 10:15 UTC2h 10m
2026-07-19 SKY557 - Jul 19, 05:15 UTCJul 19, 06:50 UTC1h 35m
2026-07-19 SKY552 - Jul 19, 03:45 UTCJul 19, 04:00 UTC15m
2026-07-19 SKY552 - Jul 19, 02:25 UTCJul 19, 02:45 UTC20m
2026-07-18 SKY513 HND → OKA Jul 18, 23:00 UTCJul 19, 01:05 UTC2h 5m
2026-07-18 SKY022 - Jul 18, 10:05 UTCJul 18, 11:30 UTC1h 25m
2026-07-18 SKY021 HND → FUK Jul 18, 07:45 UTCJul 18, 08:50 UTC1h 5m
2026-07-18 SKY012 - Jul 18, 05:00 UTCJul 18, 06:35 UTC1h 35m
2026-07-18 SKY009 - Jul 18, 02:40 UTCJul 18, 03:40 UTC1h 1m
2026-07-18 SKY004 - Jul 18, 00:10 UTCJul 18, 01:34 UTC1h 25m
2026-07-17 SKY001 - Jul 17, 21:39 UTCJul 17, 22:45 UTC1h 5m
2026-07-17 SKY522 OKA → HND Jul 17, 12:04 UTCJul 17, 14:20 UTC2h 15m
2026-07-17 SKY521 HND → OKA Jul 17, 08:40 UTCJul 17, 10:40 UTC2h 0m

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 JA737Y page for operator, model, and routing details .

Mode-S 868042 frequently asked

What is Mode-S code 868042?
868042 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA737Y.
Where is Mode-S 868042 registered?
Mode-S code 868042 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 868042 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 12:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 868042, octal 41500102, decimal 8,814,658.
What flights does 868042 operate?
Mode-S 868042 has broadcast 20 distinct callsigns, including SKY597, SKY513, SKY593, SKY591, SKY508.