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 Jul 26, 20:55 UTC
Flights observed
171
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 20:55 UTC

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 China Southern Airlines 28 2026-07-26
CSN8302 China Southern Airlines 18 2026-07-26
CSN373 - 15 2026-07-18
CSN5096 - 12 2026-07-19
CSN5095 China Southern Airlines 12 2026-07-19
CSN367 China Southern Airlines 11 2026-07-21
CSN3048 China Southern Airlines 10 2026-07-25
CSN3047 China Southern Airlines 9 2026-07-25
CSN5035 China Southern Airlines 8 2026-07-19
CSN8020 - 7 2026-07-23
CSN8019 China Southern Airlines 7 2026-07-23
CSN5036 China Southern Airlines 5 2026-07-19
CSN374 - 5 2026-06-28
CSN6910 China Southern Airlines 3 2026-05-30
CSN6903 China Southern Airlines 3 2026-05-30
CSN3036 China Southern Airlines 3 2026-07-26
CSN3035 China Southern Airlines 3 2026-07-26
CSN368 China Southern Airlines 2 2026-06-24
CSN8348 China Southern Airlines 1 2026-05-24
CSN8347 China Southern Airlines 1 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN3036 BKK → CAN Jul 26, 20:25 UTCJul 26, 20:55 UTC30m
2026-07-26 CSN3035 CAN → BKK Jul 26, 13:00 UTCJul 26, 18:15 UTC5h 15m
2026-07-26 CSN8302 KUL → CAN Jul 26, 10:20 UTCJul 26, 10:35 UTC15m
2026-07-26 CSN8301 CAN → KUL Jul 26, 08:00 UTCJul 26, 08:45 UTC45m
2026-07-25 CSN8301 CAN → KUL Jul 25, 13:50 UTCJul 26, 08:45 UTC18h 56m
2026-07-25 CSN3048 KUL → CAN Jul 25, 07:20 UTCJul 25, 07:35 UTC15m
2026-07-25 CSN3047 CAN → KUL Jul 25, 05:20 UTCJul 25, 06:00 UTC40m
2026-07-24 CSN3036 BKK → CAN Jul 24, 20:25 UTCJul 24, 20:55 UTC30m
2026-07-24 CSN3035 CAN → BKK Jul 24, 16:55 UTCJul 24, 18:30 UTC1h 35m
2026-07-24 CSN8302 KUL → CAN Jul 24, 10:05 UTCJul 24, 10:20 UTC15m
2026-07-24 CSN8301 CAN → KUL Jul 24, 08:15 UTCJul 24, 08:45 UTC30m
2026-07-24 CSN8301 CAN → KUL Jul 24, 05:15 UTCJul 24, 05:25 UTC10m
2026-07-24 CSN3724 - Jul 24, 03:10 UTCJul 24, 03:20 UTC10m
2026-07-23 CSN8020 - Jul 23, 13:25 UTCJul 23, 13:55 UTC30m
2026-07-23 CSN8019 CAN → BKK Jul 23, 10:00 UTCJul 23, 11:50 UTC1h 50m
2026-07-22 CSN3036 BKK → CAN Jul 22, 20:35 UTCJul 22, 21:00 UTC25m
2026-07-22 CSN3035 - Jul 22, 11:25 UTCJul 22, 18:40 UTC7h 15m
2026-07-21 CSN367 CAN → SGN Jul 21, 13:50 UTCJul 21, 14:05 UTC15m
2026-07-21 CSN3048 KUL → CAN Jul 21, 08:00 UTCJul 21, 08:15 UTC15m
2026-07-21 CSN3047 CAN → KUL Jul 21, 03:25 UTCJul 21, 06:40 UTC3h 15m
2026-07-20 CSN8020 - Jul 20, 14:00 UTCJul 20, 14:25 UTC25m
2026-07-20 CSN8019 CAN → BKK Jul 20, 12:05 UTCJul 20, 12:30 UTC25m
2026-07-20 CSN3409 CAN → KMG Jul 20, 00:35 UTCJul 20, 00:45 UTC10m
2026-07-19 CSN5036 LAX → CAN Jul 19, 17:45 UTCJul 19, 18:00 UTC15m
2026-07-19 CSN5035 CAN → LAX Jul 19, 12:50 UTCJul 19, 16:05 UTC3h 15m
2026-07-19 CSN5096 - Jul 19, 08:35 UTCJul 19, 08:50 UTC15m
2026-07-19 CSN5095 CAN → BKK Jul 19, 06:50 UTCJul 19, 07:10 UTC20m
2026-07-18 CSN373 - Jul 18, 05:20 UTCJul 18, 05:30 UTC10m
2026-07-17 CSN5096 - Jul 17, 08:45 UTCJul 17, 08:54 UTC10m
2026-07-17 CSN5095 CAN → BKK Jul 17, 07:00 UTCJul 17, 07:25 UTC25m
2026-07-16 CSN373 - Jul 16, 06:05 UTCJul 16, 06:15 UTC10m
2026-07-15 CSN3048 - Jul 15, 07:10 UTCJul 15, 07:25 UTC15m
2026-07-15 CSN3047 - Jul 15, 01:45 UTCJul 15, 05:05 UTC3h 20m
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

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 Jul 26, 20:55 UTC.
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.