Apparatus

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sensors Mode-S transponder

780521

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-6552 · AIRBUS A-321

Hex
780521
Octal
36002441
Decimal
7,865,633
Country
CN
Tail
B-6552
Type
A321
No current signal · last broadcast Jul 26, 10:20 UTC
Flights observed
340
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 10:20 UTC

Last known position

Most recent position reported by Mode-S 780521.

Country allocation

The ICAO 24-bit address 780521 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
CSN8076 China Southern Airlines 19 2026-07-25
CSN8323 China Southern Airlines 16 2026-07-24
CSN8075 China Southern Airlines 15 2026-07-25
CSN8324 China Southern Airlines 14 2026-07-24
CSN3191 - 11 2026-07-10
CSN8466 - 9 2026-07-20
CSN8465 - 8 2026-07-20
CSN3192 China Southern Airlines 7 2026-07-24
CSN8469 - 6 2026-07-18
CSN8470 China Southern Airlines 5 2026-07-22
CSN8284 - 5 2026-07-09
CSN8283 - 5 2026-07-08
CSN8083 China Southern Airlines 5 2026-07-19
CSN5861 China Southern Airlines 5 2026-05-28
CSN5844 China Southern Airlines 5 2026-05-22
CSN3159 China Southern Airlines 5 2026-07-23
CSN3155 China Southern Airlines 5 2026-07-23
CSN8553 - 4 2026-07-06
CSN6446 China Southern Airlines 4 2026-07-20
CSN3642 - 4 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN5841 SZX → XIY Jul 26, 10:05 UTCJul 26, 10:20 UTC15m
2026-07-25 CSN3955 SZX → HAK Jul 25, 14:25 UTCJul 25, 14:35 UTC10m
2026-07-25 CSN8076 BKK → SZX Jul 25, 12:25 UTCJul 25, 12:50 UTC25m
2026-07-25 CSN8076 BKK → SZX Jul 25, 06:25 UTCJul 25, 06:55 UTC30m
2026-07-25 CSN8075 SZX → BKK Jul 25, 01:15 UTCJul 25, 03:35 UTC2h 20m
2026-07-24 CSN8324 BKK → SZX Jul 24, 10:25 UTCJul 24, 10:55 UTC30m
2026-07-24 CSN8323 SZX → BKK Jul 24, 08:10 UTCJul 24, 08:55 UTC45m
2026-07-24 CSN8323 SZX → BKK Jul 24, 06:25 UTCJul 24, 06:35 UTC10m
2026-07-24 CSN3192 PEK → SZX Jul 24, 04:30 UTCJul 24, 04:50 UTC20m
2026-07-23 CSN3155 SZX → PEK Jul 23, 11:40 UTCJul 23, 11:55 UTC15m
2026-07-23 CSN3160 PEK → SZX Jul 23, 10:00 UTCJul 23, 10:20 UTC20m
2026-07-23 CSN3159 SZX → PEK Jul 23, 02:55 UTCJul 23, 03:15 UTC20m
2026-07-22 CSN8738 NGB → SZX Jul 22, 15:40 UTCJul 23, 01:40 UTC10h 0m
2026-07-22 CSN8737 SZX → NGB Jul 22, 14:25 UTCJul 22, 14:35 UTC10m
2026-07-22 CSN8470 HAN → SZX Jul 22, 11:25 UTCJul 22, 11:40 UTC15m
2026-07-22 CSN3559 - Jul 22, 00:35 UTCJul 22, 00:45 UTC10m
2026-07-21 CSN5854 SYX → SZX Jul 21, 17:20 UTCJul 21, 17:45 UTC25m
2026-07-21 CSN5853 SZX → SYX Jul 21, 10:10 UTCJul 21, 10:20 UTC10m
2026-07-21 CSN8736 - Jul 21, 07:20 UTCJul 21, 08:40 UTC1h 20m
2026-07-21 CSN8735 - Jul 21, 00:55 UTCJul 21, 01:10 UTC15m
2026-07-20 CSN6446 CGD → SZX Jul 20, 15:40 UTCJul 20, 15:55 UTC15m
2026-07-20 CSN6445 SZX → CGD Jul 20, 11:45 UTCJul 20, 12:05 UTC20m
2026-07-20 CSN8466 - Jul 20, 09:50 UTCJul 20, 10:05 UTC15m
2026-07-20 CSN8465 - Jul 20, 04:15 UTCJul 20, 04:25 UTC10m
2026-07-20 CSN3642 - Jul 20, 02:20 UTCJul 20, 02:30 UTC10m
2026-07-19 CSN3641 SZX → CKG Jul 19, 13:40 UTCJul 19, 13:50 UTC10m
2026-07-19 CSN8084 - Jul 19, 11:10 UTCJul 19, 11:30 UTC20m
2026-07-19 CSN8084 - Jul 19, 09:55 UTCJul 19, 10:20 UTC25m
2026-07-19 CSN8083 SZX → HAN Jul 19, 06:25 UTCJul 19, 06:45 UTC20m
2026-07-19 CSN8083 SZX → HAN Jul 19, 05:30 UTCJul 19, 05:45 UTC15m
2026-07-19 CSN3642 - Jul 19, 02:20 UTCJul 19, 02:30 UTC10m
2026-07-18 CSN3641 - Jul 18, 13:30 UTCJul 18, 13:45 UTC15m
2026-07-18 CSN8470 HAN → SZX Jul 18, 10:10 UTCJul 18, 10:25 UTC15m
2026-07-18 CSN8469 - Jul 18, 07:35 UTCJul 18, 08:05 UTC30m
2026-07-18 CSN8469 - Jul 18, 06:50 UTCJul 18, 07:00 UTC10m
2026-07-18 CSN3192 - Jul 18, 04:55 UTCJul 18, 05:05 UTC10m
2026-07-17 CSN3155 SZX → PEK Jul 17, 11:55 UTCJul 17, 12:04 UTC10m
2026-07-17 CSN8466 - Jul 17, 09:55 UTCJul 17, 10:15 UTC20m
2026-07-17 CSN8465 - Jul 17, 04:10 UTCJul 17, 04:20 UTC10m
2026-07-16 CSN8737 - Jul 16, 13:30 UTCJul 16, 13:40 UTC10m
2026-07-16 CSN8470 - Jul 16, 12:05 UTCJul 16, 12:14 UTC10m
2026-07-16 CSN8470 - Jul 16, 10:55 UTCJul 16, 11:10 UTC15m
2026-07-16 CSN8469 - Jul 16, 09:00 UTCJul 16, 09:25 UTC25m
2026-07-16 CSN8469 - Jul 16, 08:10 UTCJul 16, 08:20 UTC10m
2026-07-16 CSN3406 - Jul 16, 06:20 UTCJul 16, 06:35 UTC15m
2026-07-15 CSN6922 - Jul 15, 12:10 UTCJul 15, 12:25 UTC15m
2026-07-15 CSN6921 - Jul 15, 01:20 UTCJul 15, 01:30 UTC10m
2026-07-14 CSN3154 - Jul 14, 14:35 UTCJul 14, 14:45 UTC10m
2026-07-14 CSN3167 - Jul 14, 06:35 UTCJul 14, 06:50 UTC15m
2026-07-14 CSN3352 - Jul 14, 04:50 UTCJul 14, 05:15 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-6552 page for operator, model, and routing details .

Mode-S 780521 frequently asked

What is Mode-S code 780521?
780521 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-6552.
Where is Mode-S 780521 registered?
Mode-S code 780521 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 780521 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 10:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 780521, octal 36002441, decimal 7,865,633.
What flights does 780521 operate?
Mode-S 780521 has broadcast 20 distinct callsigns, including CSN8076, CSN8323, CSN8075, CSN8324, CSN3191.