Apparatus

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sensors Mode-S transponder

781571

ICAO 24-bit transponder address · allocated to China

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

Hex
781571
Octal
36012561
Decimal
7,869,809
Country
CN
Tail
B-303Y
Type
A21N
No current signal · last broadcast 4h ago
Flights observed
149
Distinct callsigns
20
Country
CN
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 781571.

Country allocation

The ICAO 24-bit address 781571 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
CSN3040 - 14 2026-07-11
CSN3062 - 13 2026-07-08
CSN3061 - 13 2026-07-08
CSN352 - 12 2026-07-13
CSN351 - 8 2026-07-12
CSN3039 - 8 2026-07-11
CSN5016 - 7 2026-06-29
CSN5015 - 7 2026-06-29
CSN8099 - 6 2026-06-14
CSN357 - 6 2026-06-26
CSN8100 - 5 2026-06-14
CSN358 - 5 2026-06-26
CSN340 - 5 2026-06-22
CSN339 - 5 2026-06-21
CSN3616 - 4 2026-07-04
CSN361 China Southern Airlines 4 2026-06-27
CSN8988 - 3 2026-07-12
CSN362 China Southern Airlines 3 2026-06-28
CSN8484 - 2 2026-07-13
CSN8483 - 2 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CSN3198 - Jul 14, 06:45 UTCJul 14, 06:55 UTC10m
2026-07-13 CSN8484 - Jul 13, 20:15 UTCJul 13, 20:35 UTC20m
2026-07-13 CSN8484 - Jul 13, 17:40 UTCJul 13, 18:15 UTC35m
2026-07-13 CSN8483 - Jul 13, 16:20 UTCJul 13, 16:35 UTC15m
2026-07-13 CSN8483 - Jul 13, 14:05 UTCJul 13, 14:20 UTC15m
2026-07-13 CSN352 - Jul 13, 03:25 UTCJul 13, 03:50 UTC25m
2026-07-13 CSN352 - Jul 13, 00:20 UTCJul 13, 00:45 UTC25m
2026-07-12 CSN351 - Jul 12, 11:45 UTCJul 12, 14:55 UTC3h 10m
2026-07-12 CSN8988 - Jul 12, 02:25 UTCJul 12, 07:25 UTC5h 0m
2026-07-11 CSN3040 - Jul 11, 13:15 UTCJul 11, 13:45 UTC30m
2026-07-11 CSN3040 - Jul 11, 10:10 UTCJul 11, 10:40 UTC30m
2026-07-11 CSN3039 - Jul 11, 05:15 UTCJul 11, 08:30 UTC3h 15m
2026-07-10 CSN6851 - Jul 10, 03:20 UTCJul 10, 07:35 UTC4h 15m
2026-07-09 CSN3806 - Jul 9, 15:05 UTCJul 9, 15:30 UTC25m
2026-07-08 CSN3062 - Jul 8, 07:55 UTCJul 8, 08:40 UTC45m
2026-07-08 CSN3061 - Jul 8, 05:30 UTCJul 8, 06:10 UTC40m
2026-07-07 CSN3040 - Jul 7, 14:00 UTCJul 7, 14:15 UTC15m
2026-07-07 CSN3040 - Jul 7, 10:50 UTCJul 7, 11:15 UTC25m
2026-07-07 CSN3039 - Jul 7, 08:50 UTCJul 7, 09:10 UTC20m
2026-07-07 CSN3039 - Jul 7, 05:45 UTCJul 7, 06:05 UTC20m
2026-07-07 CSN352 - Jul 7, 00:05 UTCJul 7, 00:35 UTC30m
2026-07-06 CSN351 - Jul 6, 15:25 UTCJul 6, 15:55 UTC30m
2026-07-06 CSN351 - Jul 6, 12:45 UTCJul 6, 12:55 UTC10m
2026-07-05 CSN8988 - Jul 5, 13:35 UTCJul 6, 07:15 UTC17h 40m
2026-07-05 CSN8988 - Jul 5, 08:55 UTCJul 6, 07:15 UTC22h 20m
2026-07-05 CSN3623 - Jul 5, 02:15 UTCJul 5, 14:00 UTC11h 45m
2026-07-04 CSN3623 - Jul 4, 14:30 UTCJul 5, 14:00 UTC23h 30m
2026-07-04 CSN3616 - Jul 4, 07:10 UTCJul 5, 02:25 UTC19h 15m
2026-07-04 CSN3616 - Jul 4, 02:45 UTCJul 5, 02:15 UTC23h 30m
2026-07-03 CSN3616 - Jul 3, 14:40 UTCJul 4, 07:35 UTC16h 55m
2026-07-03 CSN3616 - Jul 3, 08:55 UTCJul 4, 07:35 UTC22h 40m
2026-07-03 CSN352 - Jul 3, 04:00 UTCJul 3, 04:10 UTC10m
2026-07-03 CSN352 - Jul 3, 00:50 UTCJul 3, 01:20 UTC30m
2026-07-02 CSN351 - Jul 2, 15:25 UTCJul 2, 15:55 UTC30m
2026-07-02 CSN351 - Jul 2, 12:35 UTCJul 2, 12:45 UTC10m
2026-06-30 CSN3040 - Jun 30, 14:00 UTCJun 30, 14:15 UTC15m
2026-06-30 CSN3040 - Jun 30, 10:55 UTCJun 30, 11:20 UTC25m
2026-06-30 CSN3039 - Jun 30, 06:05 UTCJun 30, 09:20 UTC3h 15m
2026-06-29 CSN5016 - Jun 29, 07:30 UTCJun 29, 08:39 UTC1h 10m
2026-06-29 CSN5015 - Jun 29, 02:09 UTCJun 29, 05:15 UTC3h 5m
2026-06-28 CSN362 BKK → CAN Jun 28, 01:44 UTCJun 28, 02:14 UTC30m
2026-06-27 CSN361 CAN → BKK Jun 27, 12:39 UTCJun 27, 14:45 UTC2h 5m
2026-06-27 CSN5016 - Jun 27, 07:24 UTCJun 27, 08:20 UTC55m
2026-06-27 CSN5015 - Jun 27, 02:35 UTCJun 27, 05:19 UTC2h 45m
2026-06-26 CSN358 - Jun 26, 04:55 UTCJun 26, 06:25 UTC1h 30m
2026-06-26 CSN357 - Jun 26, 01:15 UTCJun 26, 03:20 UTC2h 5m
2026-06-25 CSN362 BKK → CAN Jun 25, 01:24 UTCJun 25, 02:59 UTC1h 35m
2026-06-24 CSN361 CAN → BKK Jun 24, 14:34 UTCJun 24, 15:05 UTC30m
2026-06-24 CSN361 CAN → BKK Jun 24, 13:05 UTCJun 24, 13:50 UTC45m
2026-06-24 CSN5016 - Jun 24, 07:24 UTCJun 24, 08:14 UTC50m

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

Mode-S 781571 frequently asked

What is Mode-S code 781571?
781571 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-303Y.
Where is Mode-S 781571 registered?
Mode-S code 781571 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781571 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781571, octal 36012561, decimal 7,869,809.
What flights does 781571 operate?
Mode-S 781571 has broadcast 20 distinct callsigns, including CSN3040, CSN3062, CSN3061, CSN352, CSN351.