Apparatus

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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 Jul 26, 13:25 UTC
Flights observed
124
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 13:25 UTC

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 20 distinct

Callsign Airline Flights Last seen
CSN671 China Southern Airlines 28 2026-07-26
CSN672 China Southern Airlines 21 2026-07-26
CSN6312 - 11 2026-07-08
CSN6465 China Southern Airlines 8 2026-07-21
CSN6311 - 6 2026-06-27
CSN6414 - 5 2026-07-05
CSN6402 China Southern Airlines 4 2026-07-18
CSN6304 China Southern Airlines 4 2026-07-17
CSN6303 China Southern Airlines 4 2026-07-17
CSN5307 China Southern Airlines 4 2026-07-02
CSN6403 - 3 2026-07-16
CSN3602 China Southern Airlines 3 2026-05-03
CSN3601 China Southern Airlines 3 2026-05-03
CSN8874 - 2 2026-07-17
CSN6469 China Southern Airlines 2 2026-05-19
CSN6674 China Southern Airlines 1 2026-06-07
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN672 ICN → SHE Jul 26, 12:50 UTCJul 26, 13:25 UTC35m
2026-07-26 CSN671 SHE → ICN Jul 26, 10:55 UTCJul 26, 11:40 UTC45m
2026-07-25 CSN671 SHE → ICN Jul 25, 13:00 UTCJul 26, 11:40 UTC22h 40m
2026-07-25 CSN671 SHE → ICN Jul 25, 01:25 UTCJul 25, 11:20 UTC9h 55m
2026-07-21 CSN6465 SHE → CKG Jul 21, 05:40 UTCJul 21, 16:15 UTC10h 35m
2026-07-20 CSN672 ICN → SHE Jul 20, 14:50 UTCJul 21, 09:25 UTC18h 34m
2026-07-20 CSN671 SHE → ICN Jul 20, 12:25 UTCJul 20, 13:20 UTC55m
2026-07-19 CSN672 ICN → SHE Jul 19, 13:00 UTCJul 20, 12:30 UTC23h 30m
2026-07-19 CSN671 SHE → ICN Jul 19, 07:45 UTCJul 19, 11:20 UTC3h 35m
2026-07-18 CSN6402 TFU → SHE Jul 18, 08:35 UTCJul 19, 07:55 UTC23h 20m
2026-07-17 CSN5857 - Jul 17, 15:49 UTCJul 18, 08:35 UTC16h 46m
2026-07-17 CSN6304 SZX → SHE Jul 17, 13:29 UTCJul 17, 13:40 UTC10m
2026-07-17 CSN6303 SHE → SZX Jul 17, 11:00 UTCJul 17, 11:20 UTC20m
2026-07-17 CSN6303 SHE → SZX Jul 17, 08:30 UTCJul 17, 08:45 UTC15m
2026-07-17 CSN8874 - Jul 17, 04:35 UTCJul 17, 04:49 UTC15m
2026-07-16 CSN6403 - Jul 16, 01:15 UTCJul 16, 16:00 UTC14h 45m
2026-07-15 CSN6403 - Jul 15, 14:00 UTCJul 16, 07:15 UTC17h 15m
2026-07-15 CSN6403 - Jul 15, 10:05 UTCJul 16, 07:15 UTC21h 10m
2026-07-14 CSN5510 - Jul 14, 20:40 UTCJul 15, 14:00 UTC17h 19m
2026-07-10 CSN6465 - Jul 10, 05:40 UTCJul 10, 15:00 UTC9h 20m
2026-07-08 CSN6312 - Jul 8, 06:15 UTCJul 8, 06:30 UTC15m
2026-07-08 CSN6253 - Jul 8, 00:55 UTCJul 8, 01:05 UTC10m
2026-07-07 CSN8874 - Jul 7, 04:45 UTCJul 7, 11:10 UTC6h 25m
2026-07-05 CSN6414 - Jul 5, 05:50 UTCJul 5, 15:00 UTC9h 10m
2026-07-04 CSN6465 - Jul 4, 10:45 UTCJul 5, 09:00 UTC22h 15m
2026-07-04 CSN6414 - Jul 4, 06:55 UTCJul 5, 05:55 UTC23h 0m
2026-07-03 CSN6465 - Jul 3, 09:05 UTCJul 4, 07:10 UTC22h 5m
2026-07-03 CSN6465 - Jul 3, 05:35 UTCJul 3, 09:25 UTC3h 50m
2026-07-02 CSN6465 - Jul 2, 14:00 UTCJul 3, 09:25 UTC19h 25m
2026-07-02 CSN5308 - Jul 2, 09:05 UTCJul 3, 05:40 UTC20h 35m
2026-07-02 CSN5307 CGQ → FRA Jul 2, 01:30 UTCJul 2, 14:00 UTC12h 30m
2026-07-01 CSN5307 CGQ → FRA Jul 1, 14:45 UTCJul 2, 14:00 UTC23h 15m
2026-07-01 CSN5307 CGQ → FRA Jul 1, 09:20 UTCJul 2, 05:00 UTC19h 40m
2026-07-01 CSN5307 CGQ → FRA Jul 1, 05:45 UTCJul 2, 04:30 UTC22h 45m
2026-06-30 CSN6414 - Jun 30, 13:40 UTCJul 1, 09:40 UTC20h 0m
2026-06-29 CSN6466 - Jun 29, 15:09 UTCJun 30, 13:55 UTC22h 46m
2026-06-29 CSN6465 - Jun 29, 09:00 UTCJun 29, 15:19 UTC6h 20m
2026-06-27 CSN6312 - Jun 27, 08:35 UTCJun 28, 06:49 UTC22h 15m
2026-06-27 CSN6312 - Jun 27, 06:05 UTCJun 27, 06:15 UTC10m
2026-06-27 CSN6311 - Jun 27, 00:50 UTCJun 27, 01:04 UTC15m
2026-06-25 CSN6312 - Jun 25, 06:05 UTCJun 25, 06:14 UTC10m
2026-06-25 CSN6311 - Jun 25, 01:24 UTCJun 25, 01:35 UTC10m
2026-06-23 CSN5811 - Jun 23, 04:25 UTCJun 23, 05:04 UTC40m
2026-06-22 CSN6408 CSX → SHE Jun 22, 06:35 UTCJun 23, 05:04 UTC22h 30m
2026-06-21 CSN672 - Jun 21, 12:55 UTCJun 22, 06:49 UTC17h 55m
2026-06-21 CSN671 - Jun 21, 10:49 UTCJun 21, 11:10 UTC20m
2026-06-21 CSN6402 - Jun 21, 07:34 UTCJun 21, 07:49 UTC15m
2026-06-15 CSN672 - Jun 15, 12:55 UTCJun 15, 13:15 UTC20m
2026-06-15 CSN671 - Jun 15, 10:35 UTCJun 15, 11:30 UTC55m
2026-06-14 CSN671 ICN → ICN Jun 14, 13:25 UTCJun 15, 11:30 UTC22h 4m

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 Jul 26, 13:25 UTC.
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 20 distinct callsigns, including CSN671, CSN672, CSN6312, CSN6465, CSN6311.