Apparatus

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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 Jul 26, 21:55 UTC
Flights observed
213
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 21:55 UTC

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 20 distinct

Callsign Airline Flights Last seen
CSN8031 - 36 2026-06-17
CSN8044 China Southern Airlines 16 2026-06-01
CSN326 China Southern Airlines 16 2026-07-18
CSN8032 China Southern Airlines 15 2026-06-17
CSN307 - 12 2026-07-05
CSN325 China Southern Airlines 10 2026-07-26
CSN308 - 10 2026-07-06
CSN306 China Southern Airlines 10 2026-07-25
CSN354 China Southern Airlines 9 2026-07-26
CSN8027 - 7 2026-07-11
CSN353 China Southern Airlines 7 2026-07-26
CSN305 China Southern Airlines 7 2026-07-24
CSN8028 - 6 2026-07-11
CSN655 - 5 2026-07-04
CSN382 China Southern Airlines 5 2026-05-10
CSN3561 China Southern Airlines 4 2026-06-08
CSN381 China Southern Airlines 3 2026-05-09
CSN3562 China Southern Airlines 3 2026-06-01
CSN3256 China Southern Airlines 3 2026-05-26
CSN303 - 3 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN325 CAN → SYD Jul 26, 14:45 UTCJul 26, 21:50 UTC7h 5m
2026-07-26 CSN354 SIN → CAN Jul 26, 09:15 UTCJul 26, 09:25 UTC10m
2026-07-26 CSN354 SIN → CAN Jul 26, 06:00 UTCJul 26, 06:45 UTC46m
2026-07-26 CSN353 CAN → SIN Jul 26, 03:35 UTCJul 26, 04:05 UTC30m
2026-07-25 CSN306 AKL → CAN Jul 25, 09:45 UTCJul 25, 19:40 UTC9h 55m
2026-07-24 CSN305 CAN → AKL Jul 24, 17:20 UTCJul 25, 03:40 UTC10h 20m
2026-07-23 CSN690 LGW → CAN Jul 23, 10:35 UTCJul 23, 17:15 UTC6h 40m
2026-07-22 CSN689 CAN → LGW Jul 22, 22:30 UTCJul 23, 05:20 UTC6h 50m
2026-07-22 CSN354 SIN → CAN Jul 22, 13:10 UTCJul 22, 13:25 UTC15m
2026-07-22 CSN353 CAN → SIN Jul 22, 01:20 UTCJul 22, 05:25 UTC4h 5m
2026-07-21 CSN306 - Jul 21, 19:30 UTCJul 21, 19:50 UTC20m
2026-07-21 CSN306 - Jul 21, 09:20 UTCJul 21, 18:50 UTC9h 30m
2026-07-20 CSN305 CAN → AKL Jul 20, 17:15 UTCJul 21, 03:35 UTC10h 19m
2026-07-20 CSN354 SIN → CAN Jul 20, 08:50 UTCJul 20, 09:25 UTC35m
2026-07-20 CSN354 SIN → CAN Jul 20, 05:55 UTCJul 20, 06:20 UTC25m
2026-07-20 CSN353 CAN → SIN Jul 20, 03:20 UTCJul 20, 03:50 UTC30m
2026-07-20 CSN353 CAN → SIN Jul 20, 00:40 UTCJul 20, 00:55 UTC15m
2026-07-19 CSN306 - Jul 19, 20:05 UTCJul 19, 20:35 UTC30m
2026-07-19 CSN306 - Jul 19, 09:35 UTCJul 19, 19:20 UTC9h 45m
2026-07-19 CSN305 CAN → AKL Jul 19, 03:55 UTCJul 19, 04:10 UTC15m
2026-07-18 CSN305 CAN → AKL Jul 18, 17:45 UTCJul 19, 01:55 UTC8h 10m
2026-07-18 CSN326 SYD → CAN Jul 18, 08:35 UTCJul 18, 08:55 UTC20m
2026-07-18 CSN326 SYD → CAN Jul 18, 00:29 UTCJul 18, 07:50 UTC7h 21m
2026-07-17 CSN325 CAN → SYD Jul 17, 13:35 UTCJul 17, 22:29 UTC8h 55m
2026-07-17 CSN354 - Jul 17, 09:15 UTCJul 17, 09:30 UTC15m
2026-07-17 CSN354 - Jul 17, 06:15 UTCJul 17, 06:40 UTC25m
2026-07-17 CSN353 CAN → SIN Jul 17, 03:59 UTCJul 17, 04:20 UTC20m
2026-07-17 CSN353 CAN → SIN Jul 17, 01:05 UTCJul 17, 01:25 UTC20m
2026-07-15 CSN306 - Jul 15, 20:25 UTCJul 15, 20:40 UTC15m
2026-07-15 CSN306 - Jul 15, 12:30 UTCJul 15, 19:30 UTC7h 0m
2026-07-15 CSN306 - Jul 15, 09:30 UTCJul 15, 09:40 UTC10m
2026-07-15 CSN305 - Jul 15, 03:15 UTCJul 15, 03:40 UTC25m
2026-07-14 CSN305 - Jul 14, 17:20 UTCJul 15, 01:25 UTC8h 4m
2026-07-13 CSN304 - Jul 13, 21:20 UTCJul 14, 03:45 UTC6h 25m
2026-07-13 CSN303 - Jul 13, 11:00 UTCJul 13, 18:00 UTC7h 0m
2026-07-12 CSN354 - Jul 12, 09:10 UTCJul 12, 09:30 UTC20m
2026-07-12 CSN354 - Jul 12, 06:05 UTCJul 12, 06:40 UTC35m
2026-07-12 CSN353 - Jul 12, 03:25 UTCJul 12, 03:50 UTC25m
2026-07-11 CSN8028 - Jul 11, 13:30 UTCJul 11, 17:05 UTC3h 35m
2026-07-11 CSN8027 - Jul 11, 05:55 UTCJul 11, 08:10 UTC2h 15m
2026-07-10 CSN8028 - Jul 10, 16:55 UTCJul 10, 17:35 UTC40m
2026-07-10 CSN8027 - Jul 10, 06:20 UTCJul 10, 10:35 UTC4h 15m
2026-07-08 CSN304 - Jul 8, 22:00 UTCJul 9, 04:25 UTC6h 25m
2026-07-08 CSN303 - Jul 8, 13:15 UTCJul 8, 20:00 UTC6h 45m
2026-07-07 CSN303 - Jul 7, 16:50 UTCJul 8, 16:45 UTC23h 55m
2026-07-07 CSN8028 - Jul 7, 15:10 UTCJul 8, 14:05 UTC22h 55m
2026-07-07 CSN8028 - Jul 7, 13:25 UTCJul 7, 17:15 UTC3h 50m
2026-07-07 CSN8027 - Jul 7, 10:45 UTCJul 7, 11:00 UTC15m
2026-07-06 CSN308 - Jul 6, 12:50 UTCJul 7, 07:15 UTC18h 25m
2026-07-06 CSN308 - Jul 6, 11:45 UTCJul 7, 07:15 UTC19h 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-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 Jul 26, 21:55 UTC.
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 20 distinct callsigns, including CSN8031, CSN8044, CSN326, CSN8032, CSN307.