Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781A53

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-320S · AIRBUS A-350-900

Hex
781A53
Octal
36015123
Decimal
7,871,059
Country
CN
Tail
B-320S
Type
A359
No current signal · last broadcast 5h ago
Flights observed
78
Distinct callsigns
17
Country
CN
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 781A53.

Country allocation

The ICAO 24-bit address 781A53 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
CSN8031 China Southern Airlines 21 2026-05-29
CSN8044 China Southern Airlines 13 2026-05-29
CSN307 China Southern Airlines 8 2026-04-27
CSN308 China Southern Airlines 7 2026-04-28
CSN382 China Southern Airlines 5 2026-05-10
CSN326 China Southern Airlines 4 2026-05-11
CSN381 China Southern Airlines 3 2026-05-09
CSN3256 China Southern Airlines 3 2026-05-26
CSN8003 China Southern Airlines 2 2026-04-26
CSN3562 China Southern Airlines 2 2026-05-25
CSN3561 China Southern Airlines 2 2026-05-25
CSN3255 China Southern Airlines 2 2026-05-26
CSN325 China Southern Airlines 2 2026-05-10
CSN8004 China Southern Airlines 1 2026-04-26
CSN656 China Southern Airlines 1 2026-04-20
CSN655 China Southern Airlines 1 2026-04-20
CSN3523 China Southern Airlines 1 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CSN8044 SJD → SZX May 29, 08:40 UTCMay 29, 19:40 UTC11h 1m
2026-05-29 CSN8031 SZX → MEX May 29, 05:45 UTCMay 29, 05:55 UTC10m
2026-05-28 CSN8031 SZX → MEX May 28, 17:15 UTCMay 29, 03:55 UTC10h 40m
2026-05-28 CSN8031 SZX → MEX May 28, 14:55 UTCMay 28, 15:05 UTC10m
2026-05-27 CSN8044 SJD → SZX May 27, 07:50 UTCMay 28, 01:50 UTC18h 0m
2026-05-27 CSN8031 SZX → MEX May 27, 05:55 UTCMay 27, 06:04 UTC10m
2026-05-26 CSN8031 SZX → MEX May 26, 17:35 UTCMay 27, 04:14 UTC10h 40m
2026-05-26 CSN8031 SZX → MEX May 26, 15:00 UTCMay 26, 15:09 UTC10m
2026-05-26 CSN3256 SHA → SZX May 26, 08:24 UTCMay 26, 08:45 UTC20m
2026-05-26 CSN3255 SZX → SHA May 26, 03:19 UTCMay 26, 03:35 UTC15m
2026-05-25 CSN3562 SHA → SZX May 25, 11:55 UTCMay 25, 12:15 UTC20m
2026-05-25 CSN3561 SZX → SHA May 25, 05:20 UTCMay 25, 05:35 UTC15m
2026-05-24 CSN8044 SJD → SZX May 24, 06:50 UTCMay 24, 18:05 UTC11h 15m
2026-05-24 CSN8031 SZX → MEX May 24, 03:25 UTCMay 24, 03:35 UTC10m
2026-05-23 CSN8031 SZX → MEX May 23, 15:05 UTCMay 24, 01:35 UTC10h 31m
2026-05-22 CSN8044 SJD → SZX May 22, 09:20 UTCMay 22, 20:25 UTC11h 5m
2026-05-22 CSN8031 SZX → MEX May 22, 07:20 UTCMay 22, 07:35 UTC15m
2026-05-21 CSN8031 SZX → MEX May 21, 19:05 UTCMay 22, 05:50 UTC10h 45m
2026-05-21 CSN8031 SZX → MEX May 21, 16:50 UTCMay 21, 17:00 UTC10m
2026-05-21 CSN8044 SJD → SZX May 21, 04:45 UTCMay 21, 04:55 UTC10m
2026-05-20 CSN8044 SJD → SZX May 20, 13:05 UTCMay 21, 01:50 UTC12h 45m
2026-05-20 CSN8044 SJD → SZX May 20, 08:00 UTCMay 20, 08:10 UTC10m
2026-05-19 CSN8031 SZX → MEX May 19, 17:20 UTCMay 20, 04:10 UTC10h 50m
2026-05-19 CSN3256 SHA → SZX May 19, 10:35 UTCMay 19, 10:55 UTC20m
2026-05-19 CSN3255 SZX → SHA May 19, 03:25 UTCMay 19, 03:35 UTC10m
2026-05-18 CSN3562 SHA → SZX May 18, 11:45 UTCMay 18, 12:15 UTC30m
2026-05-18 CSN3561 SZX → SHA May 18, 05:45 UTCMay 18, 05:55 UTC10m
2026-05-17 CSN8044 SJD → SZX May 17, 11:15 UTCMay 17, 23:10 UTC11h 55m
2026-05-17 CSN8044 SJD → SZX May 17, 06:15 UTCMay 17, 06:25 UTC10m
2026-05-17 CSN8031 SZX → MEX May 17, 03:30 UTCMay 17, 03:45 UTC15m
2026-05-16 CSN8031 SZX → MEX May 16, 15:01 UTCMay 17, 01:50 UTC10h 49m
2026-05-16 CSN8031 SZX → MEX May 16, 12:31 UTCMay 16, 12:40 UTC10m
2026-05-15 CSN8044 SJD → SZX May 15, 13:55 UTCMay 15, 20:10 UTC6h 14m
2026-05-15 CSN8044 SJD → SZX May 15, 08:55 UTCMay 15, 09:10 UTC15m
2026-05-15 CSN8031 SZX → MEX May 15, 06:00 UTCMay 15, 06:05 UTC5m
2026-05-14 CSN8031 SZX → MEX May 14, 17:30 UTCMay 15, 04:20 UTC10h 50m
2026-05-14 CSN8031 SZX → MEX May 14, 14:55 UTCMay 14, 15:05 UTC10m
2026-05-13 CSN8044 SJD → SZX May 13, 12:55 UTCMay 13, 18:55 UTC6h 0m
2026-05-13 CSN8044 SJD → SZX May 13, 08:00 UTCMay 13, 08:10 UTC10m
2026-05-13 CSN8031 SZX → MEX May 13, 05:45 UTCMay 13, 05:50 UTC5m
2026-05-12 CSN8031 SZX → MEX May 12, 17:10 UTCMay 13, 04:05 UTC10h 55m
2026-05-12 CSN8031 SZX → MEX May 12, 14:55 UTCMay 12, 15:05 UTC10m
2026-05-12 CSN3256 SHA → SZX May 12, 09:25 UTCMay 12, 09:50 UTC25m
2026-05-11 CSN326 SYD → CAN May 11, 09:15 UTCMay 11, 09:35 UTC20m
2026-05-11 CSN326 SYD → CAN May 11, 00:30 UTCMay 11, 08:20 UTC7h 50m
2026-05-10 CSN325 CAN → SYD May 10, 13:19 UTCMay 10, 21:30 UTC8h 10m
2026-05-10 CSN382 BNE → CAN May 10, 08:45 UTCMay 10, 09:10 UTC25m
2026-05-10 CSN382 BNE → CAN May 10, 00:34 UTCMay 10, 08:00 UTC7h 25m
2026-05-09 CSN381 CAN → BNE May 9, 13:35 UTCMay 9, 21:09 UTC7h 35m
2026-05-09 CSN382 BNE → CAN May 9, 08:50 UTCMay 9, 09:15 UTC25m

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-320S page for operator, model, and routing details .

Mode-S 781A53 frequently asked

What is Mode-S code 781A53?
781A53 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-320S.
Where is Mode-S 781A53 registered?
Mode-S code 781A53 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781A53 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781A53, octal 36015123, decimal 7,871,059.
What flights does 781A53 operate?
Mode-S 781A53 has broadcast 17 distinct callsigns, including CSN8031, CSN8044, CSN307, CSN308, CSN382.