Apparatus

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sensors Mode-S transponder

781551

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-303L · AIRBUS A-321neo

Hex
781551
Octal
36012521
Decimal
7,869,777
Country
CN
Tail
B-303L
Type
A21N
No current signal · last broadcast 4h ago
Flights observed
47
Distinct callsigns
14
Country
CN
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 781551.

Country allocation

The ICAO 24-bit address 781551 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 14 distinct

Callsign Airline Flights Last seen
CSN672 China Southern Airlines 15 2026-06-03
CSN671 China Southern Airlines 14 2026-06-03
CSN6456 China Southern Airlines 3 2026-05-25
CSN6401 China Southern Airlines 2 2026-05-26
CSN6315 China Southern Airlines 2 2026-05-07
CSN6311 China Southern Airlines 2 2026-05-11
CSN6517 China Southern Airlines 1 2026-04-28
CSN6507 China Southern Airlines 1 2026-05-14
CSN6469 China Southern Airlines 1 2026-05-25
CSN6402 China Southern Airlines 1 2026-04-26
CSN6312 China Southern Airlines 1 2026-05-11
CSN6304 - 1 2026-04-15
CSN5857 China Southern Airlines 1 2026-05-21
CSN5817 China Southern Airlines 1 2026-04-15

Recent flights last 47

DateFlightRouteTakeoffLandingDuration
2026-06-03 CSN672 ICN → SHE Jun 3, 13:00 UTCJun 3, 13:25 UTC25m
2026-06-03 CSN671 SHE → ICN Jun 3, 10:50 UTCJun 3, 11:15 UTC25m
2026-06-02 CSN672 ICN → SHE Jun 2, 12:50 UTCJun 3, 07:40 UTC18h 50m
2026-06-02 CSN671 SHE → ICN Jun 2, 10:50 UTCJun 2, 11:10 UTC20m
2026-06-01 CSN672 ICN → SHE Jun 1, 12:55 UTCJun 1, 13:20 UTC25m
2026-06-01 CSN671 SHE → ICN Jun 1, 10:50 UTCJun 1, 11:10 UTC20m
2026-05-30 CSN672 ICN → SHE May 30, 12:55 UTCMay 30, 13:25 UTC30m
2026-05-30 CSN671 SHE → ICN May 30, 07:30 UTCMay 30, 11:15 UTC3h 45m
2026-05-28 CSN672 ICN → SHE May 28, 13:00 UTCMay 29, 05:05 UTC16h 5m
2026-05-28 CSN671 SHE → ICN May 28, 10:50 UTCMay 28, 11:15 UTC25m
2026-05-27 CSN672 ICN → SHE May 27, 13:00 UTCMay 27, 13:20 UTC20m
2026-05-27 CSN671 SHE → ICN May 27, 10:55 UTCMay 27, 11:20 UTC25m
2026-05-26 CSN6401 SHE → TFU May 26, 10:54 UTCMay 27, 01:44 UTC14h 50m
2026-05-26 CSN6401 SHE → TFU May 26, 05:00 UTCMay 27, 01:44 UTC20h 45m
2026-05-25 CSN6469 SHE → CKG May 25, 14:20 UTCMay 26, 11:09 UTC20h 50m
2026-05-25 CSN6456 XIY → SHE May 25, 02:00 UTCMay 25, 14:30 UTC12h 30m
2026-05-22 CSN672 ICN → SHE May 22, 13:05 UTCMay 22, 13:25 UTC20m
2026-05-22 CSN671 SHE → ICN May 22, 11:05 UTCMay 22, 11:35 UTC30m
2026-05-21 CSN5857 SHE → HGH May 21, 08:10 UTCMay 21, 08:35 UTC25m
2026-05-17 CSN6456 XIY → SHE May 17, 15:10 UTCMay 18, 10:05 UTC18h 55m
2026-05-17 CSN6456 XIY → SHE May 17, 02:00 UTCMay 17, 15:25 UTC13h 25m
2026-05-14 CSN6507 SHE → PVG May 14, 04:35 UTCMay 14, 12:00 UTC7h 25m
2026-05-11 CSN6312 SZX → SHE May 11, 06:05 UTCMay 11, 06:20 UTC15m
2026-05-11 CSN6311 SHE → SZX May 11, 03:25 UTCMay 11, 03:40 UTC15m
2026-05-08 CSN6311 SHE → SZX May 8, 03:44 UTCMay 8, 03:55 UTC10m
2026-05-07 CSN6315 SHE → CAN May 7, 06:20 UTCMay 8, 01:29 UTC19h 10m
2026-05-07 CSN6315 SHE → CAN May 7, 06:10 UTCMay 8, 01:29 UTC19h 20m
2026-04-30 - - Apr 30, 14:30 UTCApr 30, 14:40 UTC10m
2026-04-28 CSN6517 SHE → XMN Apr 28, 02:55 UTCApr 28, 07:15 UTC4h 20m
2026-04-26 CSN672 ICN → SHE Apr 26, 13:00 UTCApr 26, 13:10 UTC10m
2026-04-26 CSN671 SHE → ICN Apr 26, 11:05 UTCApr 26, 11:25 UTC20m
2026-04-26 CSN6402 TFU → SHE Apr 26, 07:35 UTCApr 26, 07:45 UTC10m
2026-04-25 CSN672 ICN → SHE Apr 25, 13:00 UTCApr 25, 13:15 UTC15m
2026-04-25 CSN671 SHE → ICN Apr 25, 11:10 UTCApr 25, 11:25 UTC15m
2026-04-24 CSN672 ICN → SHE Apr 24, 13:05 UTCApr 24, 13:20 UTC15m
2026-04-24 CSN671 SHE → ICN Apr 24, 11:30 UTCApr 24, 11:45 UTC15m
2026-04-23 CSN672 ICN → SHE Apr 23, 12:55 UTCApr 23, 13:05 UTC10m
2026-04-23 CSN671 SHE → ICN Apr 23, 11:05 UTCApr 23, 11:20 UTC15m
2026-04-22 CSN672 ICN → SHE Apr 22, 13:10 UTCApr 22, 13:30 UTC20m
2026-04-22 CSN671 SHE → ICN Apr 22, 11:15 UTCApr 22, 11:30 UTC15m
2026-04-20 CSN672 ICN → SHE Apr 20, 12:55 UTCApr 20, 13:10 UTC15m
2026-04-20 CSN671 SHE → ICN Apr 20, 11:10 UTCApr 20, 11:25 UTC15m
2026-04-19 CSN672 ICN → SHE Apr 19, 13:05 UTCApr 20, 07:40 UTC18h 35m
2026-04-18 CSN672 ICN → SHE Apr 18, 13:00 UTCApr 19, 07:50 UTC18h 50m
2026-04-18 CSN671 SHE → ICN Apr 18, 10:15 UTCApr 18, 11:20 UTC1h 5m
2026-04-15 CSN6304 - Apr 15, 17:10 UTCApr 15, 17:20 UTC10m
2026-04-15 CSN5817 CSX → CKG Apr 15, 03:20 UTCApr 15, 03:50 UTC30m

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-303L page for operator, model, and routing details .

Mode-S 781551 frequently asked

What is Mode-S code 781551?
781551 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-303L.
Where is Mode-S 781551 registered?
Mode-S code 781551 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781551 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781551, octal 36012521, decimal 7,869,777.
What flights does 781551 operate?
Mode-S 781551 has broadcast 14 distinct callsigns, including CSN672, CSN671, CSN6456, CSN6401, CSN6315.