Apparatus

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sensors Mode-S transponder

781BF4

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-324P · AIRBUS A-321neo

Hex
781BF4
Octal
36015764
Decimal
7,871,476
Country
CN
Tail
B-324P
Type
A21N
No current signal · last broadcast Jul 26, 15:45 UTC
Flights observed
157
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 15:45 UTC

Last known position

Most recent position reported by Mode-S 781BF4.

Country allocation

The ICAO 24-bit address 781BF4 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
CSN8482 - 14 2026-07-14
CSN8481 - 14 2026-07-13
CSN625 China Southern Airlines 10 2026-07-23
CSN8336 - 9 2026-07-09
CSN8138 China Southern Airlines 8 2026-07-25
CSN8137 China Southern Airlines 8 2026-07-24
CSN626 China Southern Airlines 8 2026-07-23
CSN3038 - 7 2026-06-30
CSN8335 - 6 2026-07-09
CSN3037 - 6 2026-06-30
CSN387 China Southern Airlines 5 2026-07-26
CSN3086 - 5 2026-07-15
CSN3085 - 5 2026-07-14
CSN5255 China Southern Airlines 4 2026-07-25
CSN5048 - 4 2026-07-13
CSN395 - 4 2026-06-19
CSN390 - 4 2026-06-18
CSN389 - 4 2026-06-18
CSN388 China Southern Airlines 4 2026-06-03
CSN5256 China Southern Airlines 3 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN387 CAN → CGK Jul 26, 15:30 UTCJul 26, 15:45 UTC15m
2026-07-26 CSN387 CAN → CGK Jul 26, 11:30 UTCJul 26, 11:40 UTC10m
2026-07-25 CSN5256 MDC → CAN Jul 25, 15:55 UTCJul 25, 16:35 UTC40m
2026-07-25 CSN5255 CAN → MDC Jul 25, 09:35 UTCJul 25, 15:00 UTC5h 25m
2026-07-25 CSN5255 CAN → MDC Jul 25, 08:30 UTCJul 25, 08:40 UTC10m
2026-07-25 CSN8138 SUB → CAN Jul 25, 05:20 UTCJul 25, 05:55 UTC35m
2026-07-24 CSN8137 CAN → SUB Jul 24, 10:20 UTCJul 25, 03:40 UTC17h 20m
2026-07-23 CSN626 DPS → CAN Jul 23, 21:00 UTCJul 23, 21:30 UTC30m
2026-07-23 CSN625 CAN → DPS Jul 23, 10:50 UTCJul 23, 19:15 UTC8h 25m
2026-07-23 CSN8159 CAN → SGN Jul 23, 01:20 UTCJul 23, 06:55 UTC5h 35m
2026-07-22 CSN626 DPS → CAN Jul 22, 21:00 UTCJul 22, 21:20 UTC20m
2026-07-22 CSN625 CAN → DPS Jul 22, 11:10 UTCJul 22, 19:15 UTC8h 5m
2026-07-20 CSN3499 - Jul 20, 13:30 UTCJul 20, 14:15 UTC45m
2026-07-20 CSN3415 CAN → CKG Jul 20, 04:15 UTCJul 20, 04:30 UTC15m
2026-07-19 CSN8138 SUB → CAN Jul 19, 05:00 UTCJul 19, 05:15 UTC15m
2026-07-18 CSN8137 - Jul 18, 10:20 UTCJul 19, 03:15 UTC16h 55m
2026-07-17 CSN8102 - Jul 17, 05:55 UTCJul 17, 07:30 UTC1h 35m
2026-07-17 CSN8101 CAN → NRT Jul 17, 02:34 UTCJul 17, 04:25 UTC1h 50m
2026-07-16 CSN625 - Jul 16, 11:10 UTCJul 16, 19:25 UTC8h 15m
2026-07-15 CSN3086 - Jul 15, 02:00 UTCJul 15, 03:35 UTC1h 35m
2026-07-14 CSN3085 - Jul 14, 09:25 UTCJul 14, 11:10 UTC1h 45m
2026-07-14 CSN8482 - Jul 14, 04:50 UTCJul 14, 05:35 UTC45m
2026-07-13 CSN8481 - Jul 13, 19:00 UTCJul 14, 03:15 UTC8h 15m
2026-07-13 CSN5048 - Jul 13, 10:50 UTCJul 13, 11:00 UTC10m
2026-07-12 CSN3086 - Jul 12, 01:55 UTCJul 12, 03:20 UTC1h 25m
2026-07-11 CSN3085 - Jul 11, 09:20 UTCJul 11, 11:00 UTC1h 40m
2026-07-11 CSN8482 - Jul 11, 04:45 UTCJul 11, 05:20 UTC35m
2026-07-10 CSN8481 - Jul 10, 18:50 UTCJul 11, 03:10 UTC8h 20m
2026-07-09 CSN8336 - Jul 9, 15:00 UTCJul 9, 15:20 UTC20m
2026-07-09 CSN8336 - Jul 9, 12:50 UTCJul 9, 13:20 UTC30m
2026-07-09 CSN8335 - Jul 9, 09:05 UTCJul 9, 11:35 UTC2h 30m
2026-07-09 CSN8482 - Jul 9, 05:00 UTCJul 9, 05:15 UTC15m
2026-07-08 CSN8481 - Jul 8, 21:05 UTCJul 9, 03:15 UTC6h 10m
2026-07-06 CSN625 - Jul 6, 13:25 UTCJul 6, 21:25 UTC8h 0m
2026-07-04 CSN3707 - Jul 4, 11:00 UTCJul 4, 11:10 UTC10m
2026-07-04 CSN8159 - Jul 4, 03:00 UTCJul 4, 03:15 UTC15m
2026-07-02 CSN8336 - Jul 2, 13:25 UTCJul 2, 14:10 UTC45m
2026-07-02 CSN8336 - Jul 2, 11:20 UTCJul 2, 11:50 UTC30m
2026-07-02 CSN8335 - Jul 2, 07:45 UTCJul 2, 10:15 UTC2h 30m
2026-06-30 CSN3038 - Jun 30, 10:55 UTCJun 30, 11:10 UTC15m
2026-06-30 CSN3038 - Jun 30, 06:45 UTCJun 30, 08:15 UTC1h 30m
2026-06-30 CSN3037 - Jun 30, 05:00 UTCJun 30, 05:15 UTC15m
2026-06-30 CSN3037 - Jun 30, 00:55 UTCJun 30, 03:45 UTC2h 51m
2026-06-29 CSN626 - Jun 29, 20:59 UTCJun 29, 21:24 UTC25m
2026-06-29 CSN625 - Jun 29, 10:59 UTCJun 29, 19:15 UTC8h 15m
2026-06-29 CSN3415 - Jun 29, 03:34 UTCJun 29, 04:09 UTC35m
2026-06-28 CSN8988 - Jun 28, 07:54 UTCJun 29, 04:09 UTC20h 15m
2026-06-28 CSN8987 - Jun 28, 03:29 UTCJun 28, 08:09 UTC4h 40m
2026-06-27 CSN626 - Jun 27, 20:55 UTCJun 27, 21:15 UTC20m
2026-06-27 CSN625 - Jun 27, 10:50 UTCJun 27, 19:09 UTC8h 20m

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-324P page for operator, model, and routing details .

Mode-S 781BF4 frequently asked

What is Mode-S code 781BF4?
781BF4 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-324P.
Where is Mode-S 781BF4 registered?
Mode-S code 781BF4 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781BF4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781BF4, octal 36015764, decimal 7,871,476.
What flights does 781BF4 operate?
Mode-S 781BF4 has broadcast 20 distinct callsigns, including CSN8482, CSN8481, CSN625, CSN8336, CSN8138.