Apparatus

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sensors Mode-S transponder

781666

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-209X · BOEING 787-9 Dreamliner

Hex
781666
Octal
36013146
Decimal
7,870,054
Country
CN
Tail
B-209X
Type
B789
No current signal · last broadcast 18h ago
Flights observed
164
Distinct callsigns
20
Country
CN
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S 781666.

Country allocation

The ICAO 24-bit address 781666 falls within the block assigned to China (CN) by ICAO Annex 10, Volume III. Every aircraft registered in China 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
CSN8172 China Southern Airlines 15 2026-07-05
CSN8171 - 11 2026-07-04
CSN8065 - 10 2026-06-20
CSN608 China Southern Airlines 10 2026-04-26
CSN354 - 9 2026-06-19
CSN8066 - 8 2026-06-21
CSN653 - 7 2026-07-07
CSN391 - 7 2026-07-10
CSN353 - 7 2026-06-19
CSN680 - 6 2026-06-30
CSN607 China Southern Airlines 6 2026-04-26
CSN392 - 6 2026-07-10
CSN3092 - 6 2026-06-20
CSN679 - 5 2026-06-30
CSN6041 - 4 2026-07-13
CSN338 - 4 2026-07-11
CSN304 China Southern Airlines 4 2026-06-05
CSN690 - 3 2026-07-06
CSN689 - 3 2026-07-05
CSN633 - 3 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CSN6042 - Jul 13, 17:50 UTCJul 13, 20:05 UTC2h 15m
2026-07-13 CSN6041 - Jul 13, 08:20 UTCJul 13, 14:35 UTC6h 15m
2026-07-12 CSN5094 - Jul 12, 10:15 UTCJul 12, 16:35 UTC6h 20m
2026-07-11 CSN5093 - Jul 11, 22:30 UTCJul 12, 05:15 UTC6h 45m
2026-07-11 CSN338 - Jul 11, 06:35 UTCJul 11, 07:20 UTC45m
2026-07-10 CSN392 - Jul 10, 17:35 UTCJul 11, 05:15 UTC11h 41m
2026-07-10 CSN391 - Jul 10, 14:15 UTCJul 10, 15:25 UTC1h 10m
2026-07-10 CSN338 - Jul 10, 06:55 UTCJul 10, 07:30 UTC35m
2026-07-09 CSN8070 - Jul 9, 11:25 UTCJul 10, 05:25 UTC18h 0m
2026-07-07 CSN654 - Jul 7, 20:45 UTCJul 8, 03:00 UTC6h 15m
2026-07-07 CSN653 - Jul 7, 09:45 UTCJul 7, 16:40 UTC6h 55m
2026-07-06 CSN653 - Jul 6, 17:35 UTCJul 7, 16:40 UTC23h 5m
2026-07-06 CSN653 - Jul 6, 17:10 UTCJul 7, 15:30 UTC22h 20m
2026-07-06 CSN653 - Jul 6, 13:35 UTCJul 7, 13:25 UTC23h 50m
2026-07-06 CSN690 - Jul 6, 11:35 UTCJul 7, 10:30 UTC22h 55m
2026-07-06 CSN690 - Jul 6, 11:05 UTCJul 6, 17:35 UTC6h 30m
2026-07-05 CSN689 - Jul 5, 22:45 UTCJul 6, 05:35 UTC6h 50m
2026-07-05 CSN689 - Jul 5, 04:30 UTCJul 6, 02:25 UTC21h 55m
2026-07-05 CSN8172 ICN → CGQ Jul 5, 00:35 UTCJul 5, 00:50 UTC15m
2026-07-04 CSN8172 ICN → CGQ Jul 4, 17:55 UTCJul 4, 22:10 UTC4h 15m
2026-07-04 CSN8171 - Jul 4, 07:10 UTCJul 4, 15:00 UTC7h 50m
2026-07-04 CSN8172 ICN → CGQ Jul 4, 00:50 UTCJul 4, 01:00 UTC10m
2026-07-03 CSN8172 ICN → CGQ Jul 3, 18:00 UTCJul 3, 22:20 UTC4h 20m
2026-07-03 CSN8171 - Jul 3, 15:30 UTCJul 3, 15:40 UTC10m
2026-07-03 CSN8171 - Jul 3, 11:00 UTCJul 3, 13:40 UTC2h 40m
2026-07-03 CSN8171 - Jul 3, 07:40 UTCJul 3, 07:50 UTC10m
2026-07-03 CSN8172 ICN → CGQ Jul 3, 00:30 UTCJul 3, 00:45 UTC15m
2026-07-02 CSN8172 ICN → CGQ Jul 2, 17:55 UTCJul 2, 22:10 UTC4h 15m
2026-07-02 CSN8171 - Jul 2, 10:30 UTCJul 2, 15:05 UTC4h 35m
2026-07-02 CSN8172 ICN → CGQ Jul 2, 00:50 UTCJul 2, 01:00 UTC10m
2026-07-01 CSN8172 ICN → CGQ Jul 1, 18:00 UTCJul 1, 22:20 UTC4h 20m
2026-07-01 CSN8171 - Jul 1, 07:20 UTCJul 1, 15:05 UTC7h 45m
2026-06-30 CSN680 - Jun 30, 20:20 UTCJun 30, 20:35 UTC15m
2026-06-30 CSN680 - Jun 30, 12:55 UTCJun 30, 14:45 UTC1h 50m
2026-06-30 CSN679 - Jun 30, 04:40 UTCJun 30, 05:05 UTC25m
2026-06-29 CSN679 - Jun 29, 20:00 UTCJun 30, 04:05 UTC8h 5m
2026-06-28 CSN332 - Jun 28, 13:10 UTCJun 28, 19:09 UTC6h 0m
2026-06-27 CSN331 - Jun 27, 20:29 UTCJun 28, 05:20 UTC8h 50m
2026-06-24 CSN336 - Jun 24, 21:14 UTCJun 25, 08:45 UTC11h 30m
2026-06-24 CSN335 - Jun 24, 07:59 UTCJun 24, 17:55 UTC9h 55m
2026-06-22 CSN6042 FRA → URC Jun 22, 17:50 UTCJun 22, 23:55 UTC6h 5m
2026-06-22 CSN6041 URC → FRA Jun 22, 08:25 UTCJun 22, 14:45 UTC6h 20m
2026-06-21 CSN6041 URC → FRA Jun 21, 16:10 UTCJun 22, 14:45 UTC22h 35m
2026-06-21 CSN8066 - Jun 21, 11:40 UTCJun 22, 11:24 UTC23h 45m
2026-06-20 CSN8065 - Jun 20, 22:25 UTCJun 21, 03:55 UTC5h 30m
2026-06-20 CSN3092 - Jun 20, 05:14 UTCJun 20, 05:34 UTC20m
2026-06-20 CSN3092 - Jun 20, 03:59 UTCJun 20, 04:29 UTC30m
2026-06-20 CSN3091 - Jun 20, 00:54 UTCJun 20, 02:35 UTC1h 40m
2026-06-19 CSN392 - Jun 19, 17:29 UTCJun 19, 19:34 UTC2h 5m
2026-06-19 CSN391 - Jun 19, 12:39 UTCJun 19, 15:44 UTC3h 5m

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 B-209X page for operator, model, and routing details .

Mode-S 781666 frequently asked

What is Mode-S code 781666?
781666 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-209X.
Where is Mode-S 781666 registered?
Mode-S code 781666 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781666 broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781666, octal 36013146, decimal 7,870,054.
What flights does 781666 operate?
Mode-S 781666 has broadcast 20 distinct callsigns, including CSN8172, CSN8171, CSN8065, CSN608, CSN354.