Apparatus

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sensors Mode-S transponder

781739

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20CJ · BOEING 787-9 Dreamliner

Hex
781739
Octal
36013471
Decimal
7,870,265
Country
CN
Tail
B-20CJ
Type
B789
Broadcasting now · callsign CSN5093 · 35,975 ft
Flights observed
143
Distinct callsigns
20
Country
CN
Last broadcast
31m ago

Current position

781739 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 781739 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
CSN680 - 11 2026-07-02
CSN3092 - 10 2026-06-30
CSN8171 China Southern Airlines 9 2026-05-21
CSN679 - 9 2026-07-02
CSN8172 China Southern Airlines 7 2026-05-22
CSN8066 - 7 2026-07-11
CSN653 - 7 2026-07-14
CSN336 - 7 2026-06-27
CSN8065 - 5 2026-07-11
CSN689 China Southern Airlines 5 2026-04-17
CSN335 - 5 2026-06-26
CSN3091 - 5 2026-06-30
CSN690 China Southern Airlines 4 2026-04-17
CSN6037 China Southern Airlines 4 2026-05-01
CSN8049 - 3 2026-07-07
CSN654 - 3 2026-07-14
CSN608 China Southern Airlines 3 2026-06-10
CSN607 China Southern Airlines 3 2026-06-10
CSN391 - 3 2026-07-05
CSN8070 - 2 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CSN5093 - Jul 17, 13:50 UTCJul 18, 02:14 UTC12h 25m
2026-07-16 CSN664 - Jul 16, 08:15 UTCJul 16, 08:40 UTC25m
2026-07-16 CSN664 - Jul 16, 01:10 UTCJul 16, 07:25 UTC6h 15m
2026-07-15 CSN663 - Jul 15, 14:55 UTCJul 15, 23:10 UTC8h 15m
2026-07-14 CSN654 - Jul 14, 20:35 UTCJul 15, 03:10 UTC6h 34m
2026-07-14 CSN653 - Jul 14, 09:40 UTCJul 14, 16:20 UTC6h 40m
2026-07-12 CSN304 - Jul 12, 22:00 UTCJul 13, 04:20 UTC6h 20m
2026-07-12 CSN303 - Jul 12, 10:40 UTCJul 12, 17:25 UTC6h 45m
2026-07-11 CSN8066 - Jul 11, 11:30 UTCJul 11, 12:00 UTC30m
2026-07-11 CSN8065 - Jul 11, 03:20 UTCJul 11, 03:40 UTC20m
2026-07-10 CSN8065 - Jul 10, 22:10 UTCJul 11, 02:40 UTC4h 30m
2026-07-10 CSN3110 - Jul 10, 13:05 UTCJul 10, 13:15 UTC10m
2026-07-08 CSN8050 - Jul 8, 16:30 UTCJul 8, 22:55 UTC6h 25m
2026-07-07 CSN8049 - Jul 7, 18:40 UTCJul 8, 14:00 UTC19h 20m
2026-07-07 CSN8049 - Jul 7, 17:15 UTCJul 8, 14:00 UTC20h 45m
2026-07-07 CSN8070 - Jul 7, 12:20 UTCJul 8, 12:15 UTC23h 55m
2026-07-07 CSN8070 - Jul 7, 11:00 UTCJul 8, 10:15 UTC23h 15m
2026-07-07 CSN8069 - Jul 7, 09:00 UTCJul 8, 07:55 UTC22h 55m
2026-07-05 CSN392 - Jul 5, 17:55 UTCJul 5, 19:10 UTC1h 15m
2026-07-05 CSN391 ICN → DAC Jul 5, 06:35 UTCJul 5, 15:30 UTC8h 55m
2026-07-05 CSN337 - Jul 5, 04:05 UTCJul 5, 04:50 UTC45m
2026-07-03 CSN8050 - Jul 3, 21:35 UTCJul 4, 04:00 UTC6h 25m
2026-07-03 CSN8049 - Jul 3, 11:55 UTCJul 3, 18:50 UTC6h 55m
2026-07-02 CSN680 - Jul 2, 20:45 UTCJul 2, 20:55 UTC10m
2026-07-02 CSN680 - Jul 2, 13:00 UTCJul 2, 14:50 UTC1h 50m
2026-07-02 CSN679 - Jul 2, 03:30 UTCJul 2, 03:50 UTC20m
2026-07-02 CSN679 - Jul 2, 01:35 UTCJul 2, 02:50 UTC1h 15m
2026-07-01 CSN679 - Jul 1, 18:45 UTCJul 1, 18:55 UTC10m
2026-06-30 CSN8069 - Jun 30, 09:40 UTCJun 30, 20:15 UTC10h 35m
2026-06-30 CSN3092 - Jun 30, 06:15 UTCJun 30, 06:55 UTC40m
2026-06-30 CSN3092 - Jun 30, 05:00 UTCJun 30, 05:30 UTC30m
2026-06-30 CSN3091 - Jun 30, 01:04 UTCJun 30, 02:45 UTC1h 41m
2026-06-29 CSN3092 - Jun 29, 05:24 UTCJun 29, 05:40 UTC15m
2026-06-29 CSN3092 - Jun 29, 04:09 UTCJun 29, 04:39 UTC30m
2026-06-29 CSN3091 - Jun 29, 00:34 UTCJun 29, 02:14 UTC1h 40m
2026-06-27 CSN336 - Jun 27, 07:39 UTCJun 27, 07:55 UTC15m
2026-06-26 CSN336 - Jun 26, 21:10 UTCJun 27, 06:50 UTC9h 40m
2026-06-26 CSN335 - Jun 26, 08:10 UTCJun 26, 18:04 UTC9h 55m
2026-06-25 CSN8022 SHE → CAN Jun 25, 13:50 UTCJun 26, 02:50 UTC13h 0m
2026-06-24 CSN8021 - Jun 24, 13:50 UTCJun 25, 03:04 UTC13h 15m
2026-06-24 CSN3092 - Jun 24, 05:20 UTCJun 24, 05:40 UTC20m
2026-06-24 CSN3092 - Jun 24, 03:55 UTCJun 24, 04:30 UTC35m
2026-06-24 CSN3091 - Jun 24, 00:44 UTCJun 24, 02:20 UTC1h 35m
2026-06-20 CSN654 - Jun 20, 20:45 UTCJun 21, 03:00 UTC6h 15m
2026-06-20 CSN653 - Jun 20, 09:44 UTCJun 20, 16:44 UTC7h 0m
2026-06-19 CSN653 - Jun 19, 20:09 UTCJun 20, 16:44 UTC20h 35m
2026-06-19 CSN653 - Jun 19, 16:14 UTCJun 20, 14:14 UTC22h 0m
2026-06-19 CSN8066 - Jun 19, 12:34 UTCJun 20, 10:29 UTC21h 55m
2026-06-19 CSN8066 - Jun 19, 11:45 UTCJun 20, 10:15 UTC22h 30m
2026-06-19 CSN8065 - Jun 19, 03:49 UTCJun 19, 04:04 UTC15m

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-20CJ page for operator, model, and routing details .

Mode-S 781739 frequently asked

What is Mode-S code 781739?
781739 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20CJ.
Where is Mode-S 781739 registered?
Mode-S code 781739 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781739 broadcasting right now?
Yes. Mode-S 781739 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781739, octal 36013471, decimal 7,870,265.
What flights does 781739 operate?
Mode-S 781739 has broadcast 20 distinct callsigns, including CSN680, CSN3092, CSN8171, CSN679, CSN8172.