Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781552

ICAO 24-bit transponder address · allocated to China

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

Hex
781552
Octal
36012522
Decimal
7,869,778
Country
CN
Tail
B-303J
Type
A21N
No current signal · last broadcast 2d ago
Flights observed
55
Distinct callsigns
17
Country
CN
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 781552.

Country allocation

The ICAO 24-bit address 781552 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 17 distinct

Callsign Airline Flights Last seen
CSN671 China Southern Airlines 13 2026-05-26
CSN672 China Southern Airlines 10 2026-05-26
CSN6312 China Southern Airlines 7 2026-05-28
CSN6311 China Southern Airlines 4 2026-05-28
CSN6304 China Southern Airlines 3 2026-05-06
CSN3602 China Southern Airlines 3 2026-05-03
CSN3601 China Southern Airlines 3 2026-05-03
CSN6469 China Southern Airlines 2 2026-05-19
CSN6303 China Southern Airlines 2 2026-05-06
CSN666 China Southern Airlines 1 2026-05-22
CSN665 China Southern Airlines 1 2026-05-22
CSN6529 China Southern Airlines 1 2026-04-16
CSN6519 China Southern Airlines 1 2026-04-22
CSN6517 China Southern Airlines 1 2026-04-13
CSN6505 China Southern Airlines 1 2026-05-14
CSN6456 China Southern Airlines 1 2026-05-07
CSN6367 China Southern Airlines 1 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 CSN6312 SZX → SHE May 28, 06:00 UTCMay 28, 06:10 UTC10m
2026-05-28 CSN6311 SHE → SZX May 28, 04:00 UTCMay 28, 04:10 UTC10m
2026-05-28 CSN6311 SHE → SZX May 28, 01:15 UTCMay 28, 01:35 UTC20m
2026-05-27 CSN6312 SZX → SHE May 27, 05:55 UTCMay 27, 06:15 UTC20m
2026-05-26 CSN672 ICN → SHE May 26, 13:04 UTCMay 27, 01:24 UTC12h 20m
2026-05-26 CSN671 SHE → ICN May 26, 10:54 UTCMay 26, 11:20 UTC25m
2026-05-25 CSN672 ICN → SHE May 25, 12:55 UTCMay 26, 07:40 UTC18h 44m
2026-05-25 CSN671 SHE → ICN May 25, 10:20 UTCMay 25, 11:10 UTC50m
2026-05-24 CSN671 SHE → ICN May 24, 12:55 UTCMay 25, 11:10 UTC22h 15m
2026-05-24 CSN671 SHE → ICN May 24, 10:20 UTCMay 24, 11:10 UTC50m
2026-05-23 CSN672 ICN → SHE May 23, 12:50 UTCMay 24, 11:10 UTC22h 20m
2026-05-23 CSN671 SHE → ICN May 23, 10:25 UTCMay 23, 11:20 UTC55m
2026-05-22 CSN666 PUS → SHE May 22, 02:40 UTCMay 22, 03:25 UTC45m
2026-05-22 CSN665 SHE → PUS May 22, 00:30 UTCMay 22, 01:00 UTC30m
2026-05-21 CSN672 ICN → SHE May 21, 12:50 UTCMay 21, 13:10 UTC20m
2026-05-21 CSN671 SHE → ICN May 21, 07:30 UTCMay 21, 11:15 UTC3h 45m
2026-05-20 CSN6312 SZX → SHE May 20, 06:10 UTCMay 20, 06:25 UTC15m
2026-05-19 CSN6469 SHE → CKG May 19, 05:00 UTCMay 19, 10:50 UTC5h 50m
2026-05-18 CSN6469 SHE → CKG May 18, 09:55 UTCMay 19, 05:25 UTC19h 29m
2026-05-18 CSN6367 SHE → CAN May 18, 03:01 UTCMay 18, 09:55 UTC6h 55m
2026-05-14 CSN6505 SHE → PVG May 14, 01:55 UTCMay 14, 02:10 UTC15m
2026-05-12 CSN6312 SZX → SHE May 12, 05:55 UTCMay 12, 06:10 UTC15m
2026-05-07 CSN6456 XIY → SHE May 7, 01:20 UTCMay 7, 14:35 UTC13h 15m
2026-05-06 CSN6304 SZX → SHE May 6, 15:30 UTCMay 7, 14:30 UTC23h 0m
2026-05-06 CSN6304 SZX → SHE May 6, 13:10 UTCMay 6, 13:20 UTC10m
2026-05-06 CSN6303 SHE → SZX May 6, 00:55 UTCMay 6, 08:50 UTC7h 55m
2026-05-04 CSN672 ICN → SHE May 4, 12:55 UTCMay 4, 13:05 UTC10m
2026-05-04 CSN671 SHE → ICN May 4, 11:00 UTCMay 4, 11:20 UTC20m
2026-05-03 CSN3601 CAN → SHE May 3, 15:45 UTCMay 4, 07:45 UTC16h 0m
2026-05-03 CSN3601 CAN → SHE May 3, 08:35 UTCMay 4, 07:45 UTC23h 10m
2026-05-03 CSN3602 SHE → CAN May 3, 01:00 UTCMay 3, 15:55 UTC14h 54m
2026-05-01 CSN672 ICN → SHE May 1, 13:00 UTCMay 1, 13:15 UTC15m
2026-05-01 CSN671 SHE → ICN May 1, 07:30 UTCMay 1, 11:25 UTC3h 55m
2026-04-30 CSN671 SHE → ICN Apr 30, 13:05 UTCMay 1, 11:25 UTC22h 20m
2026-04-30 CSN671 SHE → ICN Apr 30, 11:05 UTCApr 30, 11:20 UTC15m
2026-04-29 CSN672 ICN → SHE Apr 29, 12:55 UTCApr 30, 07:55 UTC18h 59m
2026-04-29 CSN671 SHE → ICN Apr 29, 11:10 UTCApr 29, 11:20 UTC10m
2026-04-28 CSN672 ICN → SHE Apr 28, 12:55 UTCApr 28, 13:05 UTC10m
2026-04-28 CSN671 SHE → ICN Apr 28, 10:55 UTCApr 28, 11:15 UTC20m
2026-04-27 CSN672 ICN → SHE Apr 27, 13:15 UTCApr 28, 07:30 UTC18h 15m
2026-04-27 CSN671 SHE → ICN Apr 27, 11:00 UTCApr 27, 11:20 UTC20m
2026-04-26 CSN6304 SZX → SHE Apr 26, 15:40 UTCApr 27, 07:35 UTC15h 55m
2026-04-26 CSN6303 SHE → SZX Apr 26, 01:00 UTCApr 26, 08:40 UTC7h 40m
2026-04-25 CSN6312 SZX → SHE Apr 25, 08:40 UTCApr 26, 08:30 UTC23h 50m
2026-04-25 CSN6312 SZX → SHE Apr 25, 06:10 UTCApr 25, 06:20 UTC10m
2026-04-25 CSN6311 SHE → SZX Apr 25, 01:00 UTCApr 25, 01:10 UTC10m
2026-04-23 CSN3601 CAN → SHE Apr 23, 01:00 UTCApr 23, 15:40 UTC14h 40m
2026-04-22 CSN6519 SHE → PVG Apr 22, 10:15 UTCApr 23, 01:10 UTC14h 55m
2026-04-21 CSN672 ICN → SHE Apr 21, 12:55 UTCApr 22, 10:15 UTC21h 20m
2026-04-20 CSN6312 SZX → SHE Apr 20, 07:25 UTCApr 20, 07:35 UTC10m

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

Mode-S 781552 frequently asked

What is Mode-S code 781552?
781552 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-303J.
Where is Mode-S 781552 registered?
Mode-S code 781552 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781552 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781552, octal 36012522, decimal 7,869,778.
What flights does 781552 operate?
Mode-S 781552 has broadcast 17 distinct callsigns, including CSN671, CSN672, CSN6312, CSN6311, CSN6304.