Apparatus

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sensors Mode-S transponder

781742

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20CU · BOEING 737 MAX 8

Hex
781742
Octal
36013502
Decimal
7,870,274
Country
CN
Tail
B-20CU
Type
B38M
No current signal · last broadcast 1h ago
Flights observed
138
Distinct callsigns
20
Country
CN
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 781742.

Country allocation

The ICAO 24-bit address 781742 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
CSN8301 - 24 2026-07-14
CSN8302 - 16 2026-07-14
CSN373 - 13 2026-07-04
CSN5096 - 10 2026-07-05
CSN5095 - 10 2026-07-05
CSN367 - 10 2026-07-13
CSN5035 - 7 2026-07-12
CSN3048 - 7 2026-07-13
CSN3047 - 6 2026-07-13
CSN8020 China Southern Airlines 5 2026-06-07
CSN8019 China Southern Airlines 5 2026-06-07
CSN374 - 5 2026-06-28
CSN5036 - 4 2026-07-12
CSN6910 China Southern Airlines 3 2026-05-30
CSN6903 China Southern Airlines 3 2026-05-30
CSN368 China Southern Airlines 2 2026-06-24
CSN8348 China Southern Airlines 1 2026-05-24
CSN8347 China Southern Airlines 1 2026-05-24
CSN6911 China Southern Airlines 1 2026-06-04
CSN6013 China Southern Airlines 1 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CSN8302 - Jul 14, 10:25 UTCJul 14, 13:10 UTC2h 45m
2026-07-14 CSN8301 - Jul 14, 08:10 UTCJul 14, 08:45 UTC35m
2026-07-14 CSN8301 - Jul 14, 05:20 UTCJul 14, 05:30 UTC10m
2026-07-13 CSN367 - Jul 13, 12:45 UTCJul 13, 12:55 UTC10m
2026-07-13 CSN3048 - Jul 13, 06:50 UTCJul 13, 07:05 UTC15m
2026-07-13 CSN3047 - Jul 13, 02:01 UTCJul 13, 05:20 UTC3h 20m
2026-07-12 CSN5036 - Jul 12, 17:50 UTCJul 12, 18:05 UTC15m
2026-07-12 CSN5035 - Jul 12, 15:15 UTCJul 12, 15:45 UTC30m
2026-07-12 CSN5035 - Jul 12, 12:25 UTCJul 12, 12:40 UTC15m
2026-07-12 CSN3048 - Jul 12, 10:10 UTCJul 12, 10:30 UTC20m
2026-07-12 CSN3048 - Jul 12, 07:05 UTCJul 12, 07:31 UTC25m
2026-07-12 CSN3047 - Jul 12, 01:45 UTCJul 12, 05:01 UTC3h 15m
2026-07-11 CSN8302 - Jul 11, 10:35 UTCJul 11, 10:50 UTC15m
2026-07-11 CSN8301 - Jul 11, 08:25 UTCJul 11, 09:00 UTC35m
2026-07-11 CSN8301 - Jul 11, 05:35 UTCJul 11, 05:45 UTC10m
2026-07-10 CSN367 - Jul 10, 13:45 UTCJul 10, 13:55 UTC10m
2026-07-10 CSN3048 - Jul 10, 07:20 UTCJul 10, 07:35 UTC15m
2026-07-10 CSN3047 - Jul 10, 02:45 UTCJul 10, 06:05 UTC3h 20m
2026-07-09 CSN8302 - Jul 9, 10:05 UTCJul 9, 10:15 UTC10m
2026-07-09 CSN8301 - Jul 9, 07:45 UTCJul 9, 08:15 UTC30m
2026-07-09 CSN8301 - Jul 9, 05:05 UTCJul 9, 05:15 UTC10m
2026-07-07 CSN367 - Jul 7, 13:20 UTCJul 7, 13:40 UTC20m
2026-07-07 CSN3048 - Jul 7, 10:00 UTCJul 7, 10:10 UTC10m
2026-07-07 CSN3048 - Jul 7, 07:05 UTCJul 7, 07:20 UTC15m
2026-07-07 CSN3047 - Jul 7, 05:05 UTCJul 7, 05:35 UTC30m
2026-07-07 CSN3047 - Jul 7, 02:15 UTCJul 7, 02:30 UTC15m
2026-07-06 CSN8302 - Jul 6, 10:25 UTCJul 6, 10:40 UTC15m
2026-07-06 CSN8301 - Jul 6, 08:15 UTCJul 6, 09:00 UTC45m
2026-07-06 CSN8301 - Jul 6, 05:15 UTCJul 6, 05:35 UTC20m
2026-07-05 CSN3723 - Jul 5, 23:40 UTCJul 5, 23:55 UTC15m
2026-07-05 CSN5036 - Jul 5, 17:35 UTCJul 5, 17:50 UTC15m
2026-07-05 CSN5035 - Jul 5, 15:20 UTCJul 5, 15:55 UTC35m
2026-07-05 CSN5035 - Jul 5, 12:35 UTCJul 5, 12:45 UTC10m
2026-07-05 CSN5096 - Jul 5, 08:20 UTCJul 5, 09:10 UTC50m
2026-07-05 CSN5095 - Jul 5, 04:55 UTCJul 5, 06:35 UTC1h 40m
2026-07-04 CSN373 - Jul 4, 10:45 UTCJul 4, 15:45 UTC5h 0m
2026-07-03 CSN3048 - Jul 3, 06:50 UTCJul 3, 07:05 UTC15m
2026-07-03 CSN3047 - Jul 3, 02:35 UTCJul 3, 05:15 UTC2h 40m
2026-07-02 CSN8302 - Jul 2, 10:25 UTCJul 2, 13:15 UTC2h 50m
2026-07-02 CSN8301 - Jul 2, 06:15 UTCJul 2, 09:05 UTC2h 50m
2026-07-01 CSN373 - Jul 1, 06:10 UTCJul 1, 11:05 UTC4h 55m
2026-06-29 CSN8302 - Jun 29, 10:04 UTCJun 29, 10:20 UTC15m
2026-06-29 CSN8301 - Jun 29, 08:09 UTCJun 29, 08:39 UTC30m
2026-06-29 CSN8301 - Jun 29, 05:45 UTCJun 29, 05:54 UTC10m
2026-06-28 CSN374 - Jun 28, 11:45 UTCJun 28, 11:59 UTC15m
2026-06-28 CSN373 - Jun 28, 06:44 UTCJun 28, 06:55 UTC10m
2026-06-27 CSN374 - Jun 27, 10:19 UTCJun 27, 10:34 UTC15m
2026-06-26 CSN367 - Jun 26, 16:30 UTCJun 27, 02:45 UTC10h 15m
2026-06-26 CSN3540 KHN → CAN Jun 26, 12:55 UTCJun 26, 13:04 UTC10m
2026-06-25 CSN373 - Jun 25, 05:25 UTCJun 25, 10:35 UTC5h 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 B-20CU page for operator, model, and routing details .

Mode-S 781742 frequently asked

What is Mode-S code 781742?
781742 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20CU.
Where is Mode-S 781742 registered?
Mode-S code 781742 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781742 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781742, octal 36013502, decimal 7,870,274.
What flights does 781742 operate?
Mode-S 781742 has broadcast 20 distinct callsigns, including CSN8301, CSN8302, CSN373, CSN5096, CSN5095.