Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781AFE

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-321Z · AIRBUS A-321neo

Hex
781AFE
Octal
36015376
Decimal
7,871,230
Country
CN
Tail
B-321Z
Type
A21N
No current signal · last broadcast 18h ago
Flights observed
86
Distinct callsigns
20
Country
CN
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S 781AFE.

Country allocation

The ICAO 24-bit address 781AFE 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
CSN3038 China Southern Airlines 16 2026-05-29
CSN3037 China Southern Airlines 11 2026-05-29
CSN626 China Southern Airlines 7 2026-05-26
CSN625 China Southern Airlines 7 2026-05-26
CSN388 China Southern Airlines 6 2026-05-20
CSN387 China Southern Airlines 5 2026-05-19
CSN8481 China Southern Airlines 4 2026-05-21
CSN8482 China Southern Airlines 3 2026-05-22
CSN8336 China Southern Airlines 3 2026-04-29
CSN8335 China Southern Airlines 3 2026-04-29
CSN8159 China Southern Airlines 3 2026-04-28
CSN8138 China Southern Airlines 3 2026-04-29
CSN8490 China Southern Airlines 2 2026-05-04
CSN8137 China Southern Airlines 2 2026-04-28
CSN390 China Southern Airlines 2 2026-05-17
CSN389 China Southern Airlines 2 2026-05-17
CSN8020 China Southern Airlines 1 2026-04-18
CSN8019 China Southern Airlines 1 2026-04-18
CSN3999 China Southern Airlines 1 2026-04-26
CSN3150 China Southern Airlines 1 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CSN3038 CGK → CAN May 29, 17:50 UTCMay 29, 18:20 UTC30m
2026-05-29 CSN3038 CGK → CAN May 29, 10:40 UTCMay 29, 11:20 UTC40m
2026-05-29 CSN3038 CGK → CAN May 29, 06:35 UTCMay 29, 08:00 UTC1h 25m
2026-05-29 CSN3037 CAN → CGK May 29, 00:45 UTCMay 29, 00:55 UTC10m
2026-05-26 CSN626 DPS → CAN May 26, 20:54 UTCMay 26, 21:09 UTC15m
2026-05-26 CSN625 CAN → DPS May 26, 10:54 UTCMay 26, 19:10 UTC8h 15m
2026-05-25 CSN3038 CGK → CAN May 25, 10:15 UTCMay 25, 10:35 UTC20m
2026-05-25 CSN3038 CGK → CAN May 25, 06:15 UTCMay 25, 07:50 UTC1h 35m
2026-05-25 CSN3037 CAN → CGK May 25, 04:35 UTCMay 25, 04:50 UTC15m
2026-05-24 CSN626 DPS → CAN May 24, 20:55 UTCMay 24, 21:15 UTC20m
2026-05-24 CSN625 CAN → DPS May 24, 11:05 UTCMay 24, 19:05 UTC8h 0m
2026-05-22 CSN8482 DPS → CAN May 22, 05:05 UTCMay 22, 05:20 UTC15m
2026-05-21 CSN8481 CAN → DPS May 21, 19:10 UTCMay 22, 03:15 UTC8h 5m
2026-05-21 CSN3038 CGK → CAN May 21, 10:45 UTCMay 21, 11:05 UTC20m
2026-05-21 CSN3038 CGK → CAN May 21, 06:40 UTCMay 21, 08:05 UTC1h 25m
2026-05-21 CSN3037 CAN → CGK May 21, 04:50 UTCMay 21, 05:05 UTC15m
2026-05-20 CSN626 DPS → CAN May 20, 21:10 UTCMay 20, 21:30 UTC20m
2026-05-20 CSN625 CAN → DPS May 20, 10:55 UTCMay 20, 19:20 UTC8h 25m
2026-05-20 CSN388 CGK → CAN May 20, 06:30 UTCMay 20, 06:50 UTC20m
2026-05-20 CSN388 CGK → CAN May 20, 02:20 UTCMay 20, 03:50 UTC1h 30m
2026-05-19 CSN387 CAN → CGK May 19, 11:45 UTCMay 19, 11:55 UTC10m
2026-05-17 CSN390 KIX → CAN May 17, 07:10 UTCMay 17, 07:50 UTC40m
2026-05-17 CSN389 CAN → KIX May 17, 04:40 UTCMay 17, 05:25 UTC45m
2026-05-12 CSN626 DPS → CAN May 12, 20:50 UTCMay 12, 21:10 UTC20m
2026-05-12 CSN625 CAN → DPS May 12, 10:45 UTCMay 12, 19:05 UTC8h 20m
2026-05-11 CSN390 KIX → CAN May 11, 07:00 UTCMay 11, 07:50 UTC50m
2026-05-11 CSN389 CAN → KIX May 11, 04:00 UTCMay 11, 04:45 UTC45m
2026-05-10 CSN388 CGK → CAN May 10, 06:25 UTCMay 10, 06:59 UTC35m
2026-05-10 CSN388 CGK → CAN May 10, 02:14 UTCMay 10, 03:45 UTC1h 30m
2026-05-09 CSN387 CAN → CGK May 9, 15:35 UTCMay 9, 15:50 UTC15m
2026-05-09 CSN387 CAN → CGK May 9, 11:35 UTCMay 9, 11:45 UTC10m
2026-05-08 CSN626 DPS → CAN May 8, 20:50 UTCMay 8, 21:20 UTC30m
2026-05-08 CSN625 CAN → DPS May 8, 10:59 UTCMay 8, 19:00 UTC8h 0m
2026-05-07 CSN3038 CGK → CAN May 7, 10:50 UTCMay 7, 11:20 UTC30m
2026-05-07 CSN3038 CGK → CAN May 7, 06:45 UTCMay 7, 08:15 UTC1h 30m
2026-05-07 CSN3037 CAN → CGK May 7, 04:40 UTCMay 7, 05:15 UTC35m
2026-05-07 CSN3037 CAN → CGK May 7, 00:30 UTCMay 7, 00:40 UTC10m
2026-05-06 CSN626 DPS → CAN May 6, 20:50 UTCMay 6, 21:15 UTC25m
2026-05-06 CSN625 CAN → DPS May 6, 10:50 UTCMay 6, 18:55 UTC8h 4m
2026-05-04 CSN8490 SIN → CAN May 4, 23:10 UTCMay 4, 23:35 UTC25m
2026-05-04 CSN8490 SIN → CAN May 4, 15:25 UTCMay 4, 20:30 UTC5h 6m
2026-05-02 CSN626 DPS → CAN May 2, 21:00 UTCMay 2, 21:20 UTC20m
2026-05-02 CSN625 CAN → DPS May 2, 10:50 UTCMay 2, 19:10 UTC8h 20m
2026-05-01 CSN388 CGK → CAN May 1, 06:10 UTCMay 1, 06:45 UTC35m
2026-05-01 CSN388 CGK → CAN May 1, 02:05 UTCMay 1, 03:30 UTC1h 25m
2026-04-30 CSN387 CAN → CGK Apr 30, 15:45 UTCApr 30, 16:00 UTC15m
2026-04-30 CSN387 CAN → CGK Apr 30, 11:45 UTCApr 30, 11:55 UTC10m
2026-04-30 CSN8482 DPS → CAN Apr 30, 05:10 UTCApr 30, 05:35 UTC25m
2026-04-29 CSN8481 CAN → DPS Apr 29, 18:55 UTCApr 30, 03:15 UTC8h 19m
2026-04-29 CSN8336 BKI → CAN Apr 29, 11:45 UTCApr 29, 12:05 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-321Z page for operator, model, and routing details .

Mode-S 781AFE frequently asked

What is Mode-S code 781AFE?
781AFE is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-321Z.
Where is Mode-S 781AFE registered?
Mode-S code 781AFE is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781AFE broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781AFE, octal 36015376, decimal 7,871,230.
What flights does 781AFE operate?
Mode-S 781AFE has broadcast 20 distinct callsigns, including CSN3038, CSN3037, CSN626, CSN625, CSN388.