Apparatus

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sensors Mode-S transponder

781741

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-309Y · AIRBUS A-320neo

Hex
781741
Octal
36013501
Decimal
7,870,273
Country
CN
Tail
B-309Y
Type
A20N
No current signal · last broadcast 14h ago
Flights observed
83
Distinct callsigns
20
Country
CN
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S 781741.

Country allocation

The ICAO 24-bit address 781741 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
CSN6483 China Southern Airlines 5 2026-04-26
CSN6465 China Southern Airlines 4 2026-04-29
CSN6312 China Southern Airlines 4 2026-05-22
CSN6388 China Southern Airlines 3 2026-05-18
CSN6339 China Southern Airlines 3 2026-05-25
CSN6311 China Southern Airlines 3 2026-05-21
CSN6254 China Southern Airlines 3 2026-05-16
CSN6253 China Southern Airlines 3 2026-05-16
CSN3956 China Southern Airlines 3 2026-05-16
CSN3955 China Southern Airlines 3 2026-05-16
CSN8612 China Southern Airlines 2 2026-05-15
CSN8611 China Southern Airlines 2 2026-05-15
CSN8598 China Southern Airlines 2 2026-05-16
CSN8597 China Southern Airlines 2 2026-05-16
CSN652 China Southern Airlines 2 2026-05-06
CSN6519 China Southern Airlines 2 2026-05-24
CSN6469 China Southern Airlines 2 2026-05-02
CSN6403 China Southern Airlines 2 2026-05-10
CSN6315 China Southern Airlines 2 2026-05-29
CSN6304 - 2 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CSN6315 SHE → CAN May 29, 02:30 UTCMay 29, 15:30 UTC13h 0m
2026-05-26 CSN6738 CAN → SYX May 26, 11:39 UTCMay 26, 11:54 UTC15m
2026-05-25 CSN6339 SHE → CAN May 25, 02:20 UTCMay 25, 12:20 UTC10h 0m
2026-05-24 CSN6519 SHE → PVG May 24, 11:30 UTCMay 25, 07:25 UTC19h 55m
2026-05-22 CSN6312 SZX → SHE May 22, 06:00 UTCMay 22, 06:10 UTC10m
2026-05-21 CSN6311 SHE → SZX May 21, 06:25 UTCMay 22, 01:20 UTC18h 55m
2026-05-20 CSN6519 SHE → PVG May 20, 12:35 UTCMay 21, 10:10 UTC21h 35m
2026-05-18 CSN6388 ZUH → SHE May 18, 14:35 UTCMay 19, 04:55 UTC14h 19m
2026-05-17 CSN672 ICN → SHE May 17, 12:45 UTCMay 18, 08:05 UTC19h 20m
2026-05-17 CSN671 SHE → ICN May 17, 10:25 UTCMay 17, 11:15 UTC50m
2026-05-17 CSN3621 SZX → TFU May 17, 01:30 UTCMay 17, 01:40 UTC10m
2026-05-16 CSN3956 HAK → SZX May 16, 16:10 UTCMay 16, 16:25 UTC15m
2026-05-16 CSN3955 SZX → HAK May 16, 13:15 UTCMay 16, 13:25 UTC10m
2026-05-16 CSN8598 HGH → SZX May 16, 10:05 UTCMay 16, 10:25 UTC20m
2026-05-16 CSN8597 SZX → HGH May 16, 05:15 UTCMay 16, 05:25 UTC10m
2026-05-16 CSN6254 HAK → SZX May 16, 03:10 UTCMay 16, 03:25 UTC15m
2026-05-16 CSN6253 SZX → HAK May 16, 00:20 UTCMay 16, 00:40 UTC20m
2026-05-15 CSN8612 JHG → SZX May 15, 17:35 UTCMay 15, 17:50 UTC15m
2026-05-15 CSN8611 SZX → JHG May 15, 10:50 UTCMay 15, 11:05 UTC15m
2026-05-15 CSN3090 ICN → SZX May 15, 09:00 UTCMay 15, 09:10 UTC10m
2026-05-15 CSN3090 ICN → SZX May 15, 05:50 UTCMay 15, 06:20 UTC30m
2026-05-15 CSN3089 SZX → ICN May 15, 03:35 UTCMay 15, 04:05 UTC30m
2026-05-15 CSN3089 SZX → ICN May 15, 01:00 UTCMay 15, 01:15 UTC15m
2026-05-14 CSN3956 HAK → SZX May 14, 18:15 UTCMay 14, 18:25 UTC10m
2026-05-14 CSN3955 SZX → HAK May 14, 14:50 UTCMay 14, 15:05 UTC15m
2026-05-14 CSN8698 SYX → SZX May 14, 11:05 UTCMay 14, 11:15 UTC10m
2026-05-14 CSN8697 SZX → DLU May 14, 07:20 UTCMay 14, 07:35 UTC15m
2026-05-14 CSN6254 HAK → SZX May 14, 03:15 UTCMay 14, 03:25 UTC10m
2026-05-14 CSN6253 SZX → HAK May 14, 00:30 UTCMay 14, 00:45 UTC15m
2026-05-13 CSN8612 JHG → SZX May 13, 16:00 UTCMay 13, 16:10 UTC10m
2026-05-13 CSN8611 SZX → JHG May 13, 10:35 UTCMay 13, 10:50 UTC15m
2026-05-13 CSN3621 SZX → TFU May 13, 01:30 UTCMay 13, 01:45 UTC15m
2026-05-12 CSN3956 HAK → SZX May 12, 16:15 UTCMay 12, 16:35 UTC20m
2026-05-12 CSN3955 SZX → HAK May 12, 13:20 UTCMay 12, 13:35 UTC15m
2026-05-10 CSN6403 SHE → CKG May 10, 01:04 UTCMay 10, 11:50 UTC10h 45m
2026-05-09 CSN6403 SHE → CKG May 9, 09:50 UTCMay 10, 01:14 UTC15h 25m
2026-05-09 CSN682 ICN → SHE May 9, 04:10 UTCMay 9, 09:55 UTC5h 45m
2026-05-09 CSN681 SHE → ICN May 9, 01:55 UTCMay 9, 02:05 UTC10m
2026-05-08 CSN6347 SHE → CAN May 8, 05:05 UTCMay 8, 13:35 UTC8h 30m
2026-05-06 CSN6388 ZUH → SHE May 6, 14:45 UTCMay 7, 05:30 UTC14h 44m
2026-05-06 CSN6388 ZUH → SHE May 6, 12:25 UTCMay 6, 12:35 UTC10m
2026-05-06 CSN652 ICN → SHE May 6, 02:55 UTCMay 6, 08:01 UTC5h 5m
2026-05-05 CSN5364 KMG → SHE May 5, 15:01 UTCMay 6, 00:20 UTC9h 20m
2026-05-05 CSN5364 KMG → SHE May 5, 04:20 UTCMay 6, 00:20 UTC20h 0m
2026-05-05 CSN6152 CGO → SHE May 5, 04:05 UTCMay 6, 00:20 UTC20h 15m
2026-05-04 CSN5366 KMG → SHE May 4, 09:55 UTCMay 5, 04:20 UTC18h 26m
2026-05-03 CSN6312 SZX → SHE May 3, 09:30 UTCMay 3, 09:40 UTC10m
2026-05-03 CSN6312 SZX → SHE May 3, 07:10 UTCMay 3, 07:20 UTC10m
2026-05-02 CSN6311 SHE → SZX May 2, 10:50 UTCMay 3, 01:25 UTC14h 35m
2026-05-02 CSN6469 SHE → CKG May 2, 04:55 UTCMay 3, 01:25 UTC20h 30m

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-309Y page for operator, model, and routing details .

Mode-S 781741 frequently asked

What is Mode-S code 781741?
781741 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-309Y.
Where is Mode-S 781741 registered?
Mode-S code 781741 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781741 broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781741, octal 36013501, decimal 7,870,273.
What flights does 781741 operate?
Mode-S 781741 has broadcast 20 distinct callsigns, including CSN6483, CSN6465, CSN6312, CSN6388, CSN6339.