Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 4h ago
Flights observed
72
Distinct callsigns
20
Country
CN
Last broadcast
4h ago

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 China Southern Airlines 10 2026-05-25
CSN8481 China Southern Airlines 10 2026-05-24
CSN8336 China Southern Airlines 5 2026-05-15
CSN3038 China Southern Airlines 5 2026-05-09
CSN8335 China Southern Airlines 4 2026-05-15
CSN8138 China Southern Airlines 4 2026-05-13
CSN8137 China Southern Airlines 4 2026-05-12
CSN3037 China Southern Airlines 4 2026-05-09
CSN8490 China Southern Airlines 2 2026-04-13
CSN8489 - 2 2026-04-13
CSN626 China Southern Airlines 2 2026-05-11
CSN625 China Southern Airlines 2 2026-05-11
CSN395 China Southern Airlines 2 2026-04-20
CSN388 China Southern Airlines 2 2026-04-20
CSN3086 China Southern Airlines 2 2026-05-20
CSN3085 China Southern Airlines 2 2026-05-19
CSN8294 China Southern Airlines 1 2026-05-30
CSN8102 China Southern Airlines 1 2026-04-22
CSN8101 China Southern Airlines 1 2026-04-22
CSN5256 China Southern Airlines 1 2026-05-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CSN8294 NGB → CAN May 30, 06:10 UTCMay 30, 06:40 UTC30m
2026-05-25 CSN8482 DPS → CAN May 25, 04:50 UTCMay 25, 05:10 UTC20m
2026-05-24 CSN8481 CAN → DPS May 24, 18:40 UTCMay 25, 03:05 UTC8h 25m
2026-05-23 CSN390 KIX → CAN May 23, 07:10 UTCMay 23, 07:55 UTC45m
2026-05-23 CSN389 CAN → KIX May 23, 04:40 UTCMay 23, 05:25 UTC45m
2026-05-20 CSN8482 DPS → CAN May 20, 19:00 UTCMay 21, 05:25 UTC10h 25m
2026-05-20 CSN3086 HND → CAN May 20, 02:20 UTCMay 20, 03:40 UTC1h 20m
2026-05-19 CSN3085 CAN → HND May 19, 09:40 UTCMay 19, 11:00 UTC1h 20m
2026-05-17 CSN8482 DPS → CAN May 17, 05:00 UTCMay 17, 05:25 UTC25m
2026-05-16 CSN8481 CAN → DPS May 16, 18:55 UTCMay 17, 03:25 UTC8h 30m
2026-05-15 CSN8336 BKI → CAN May 15, 12:30 UTCMay 15, 15:15 UTC2h 44m
2026-05-15 CSN8335 CAN → BKI May 15, 08:30 UTCMay 15, 11:05 UTC2h 35m
2026-05-13 CSN8138 SUB → CAN May 13, 05:00 UTCMay 13, 05:20 UTC20m
2026-05-12 CSN8137 CAN → SUB May 12, 10:05 UTCMay 13, 03:20 UTC17h 15m
2026-05-11 CSN626 DPS → CAN May 11, 20:45 UTCMay 11, 21:05 UTC20m
2026-05-11 CSN625 CAN → DPS May 11, 10:55 UTCMay 11, 18:55 UTC8h 0m
2026-05-10 CSN8482 DPS → CAN May 10, 04:55 UTCMay 10, 05:30 UTC35m
2026-05-09 CSN8481 CAN → DPS May 9, 19:00 UTCMay 10, 03:04 UTC8h 5m
2026-05-09 CSN3038 CGK → CAN May 9, 10:50 UTCMay 9, 11:20 UTC30m
2026-05-09 CSN3038 CGK → CAN May 9, 06:30 UTCMay 9, 08:00 UTC1h 30m
2026-05-09 CSN3037 CAN → CGK May 9, 04:50 UTCMay 9, 05:05 UTC15m
2026-05-09 CSN3037 CAN → CGK May 9, 00:40 UTCMay 9, 00:50 UTC10m
2026-05-07 CSN3499 CAN → KMG May 7, 12:35 UTCMay 7, 12:55 UTC20m
2026-05-06 CSN3038 CGK → CAN May 6, 10:35 UTCMay 6, 11:00 UTC25m
2026-05-06 CSN3038 CGK → CAN May 6, 07:40 UTCMay 6, 08:01 UTC20m
2026-05-06 CSN3038 CGK → CAN May 6, 06:30 UTCMay 6, 06:45 UTC15m
2026-05-06 CSN3037 CAN → CGK May 6, 04:35 UTCMay 6, 04:50 UTC15m
2026-05-06 CSN3037 CAN → CGK May 6, 00:35 UTCMay 6, 00:46 UTC10m
2026-05-05 CSN626 DPS → CAN May 5, 21:01 UTCMay 5, 21:30 UTC30m
2026-05-05 CSN625 CAN → DPS May 5, 11:00 UTCMay 5, 19:15 UTC8h 15m
2026-05-05 CSN8482 DPS → CAN May 5, 04:50 UTCMay 5, 05:15 UTC25m
2026-05-04 CSN8481 CAN → DPS May 4, 18:55 UTCMay 5, 03:00 UTC8h 5m
2026-05-04 CSN8482 DPS → CAN May 4, 04:44 UTCMay 4, 05:15 UTC30m
2026-05-03 CSN8481 CAN → DPS May 3, 18:50 UTCMay 4, 03:00 UTC8h 10m
2026-05-03 CSN3102 PEK → CAN May 3, 05:00 UTCMay 3, 05:20 UTC20m
2026-05-02 CSN5256 MDC → CAN May 2, 15:40 UTCMay 2, 15:55 UTC15m
2026-05-02 CSN5255 CAN → MDC May 2, 08:05 UTCMay 2, 14:50 UTC6h 45m
2026-05-02 CSN8138 SUB → CAN May 2, 04:55 UTCMay 2, 05:10 UTC15m
2026-05-01 CSN8137 CAN → SUB May 1, 10:10 UTCMay 2, 03:05 UTC16h 55m
2026-05-01 CSN3086 HND → CAN May 1, 01:55 UTCMay 1, 03:25 UTC1h 30m
2026-04-30 CSN3085 CAN → HND Apr 30, 09:25 UTCApr 30, 10:35 UTC1h 10m
2026-04-22 CSN8102 NRT → CAN Apr 22, 06:05 UTCApr 22, 07:45 UTC1h 40m
2026-04-22 CSN8101 CAN → NRT Apr 22, 03:05 UTCApr 22, 04:25 UTC1h 20m
2026-04-20 CSN395 CAN → PEN Apr 20, 11:05 UTCApr 21, 06:30 UTC19h 25m
2026-04-20 CSN395 CAN → PEN Apr 20, 09:10 UTCApr 21, 06:30 UTC21h 20m
2026-04-20 CSN388 CGK → CAN Apr 20, 03:25 UTCApr 20, 04:50 UTC1h 25m
2026-04-20 CSN388 CGK → CAN Apr 20, 02:20 UTCApr 20, 02:35 UTC15m
2026-04-19 CSN387 CAN → CGK Apr 19, 13:40 UTCApr 19, 14:05 UTC25m
2026-04-18 CSN8336 BKI → CAN Apr 18, 13:30 UTCApr 18, 14:00 UTC30m
2026-04-18 CSN8336 BKI → CAN Apr 18, 11:20 UTCApr 18, 11:40 UTC20m

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 4h ago.
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, CSN8336, CSN3038, CSN8335.