Apparatus

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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 8h ago
Flights observed
189
Distinct callsigns
20
Country
CN
Last broadcast
8h 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 - 25 2026-07-07
CSN3037 - 19 2026-07-07
CSN625 - 15 2026-07-10
CSN626 - 14 2026-07-10
CSN8481 - 12 2026-07-04
CSN388 - 12 2026-07-09
CSN8482 - 11 2026-07-05
CSN387 China Southern Airlines 11 2026-07-08
CSN8336 - 10 2026-07-05
CSN8335 - 7 2026-07-05
CSN8159 - 7 2026-07-10
CSN395 - 6 2026-07-13
CSN8490 - 4 2026-06-28
CSN5048 - 4 2026-06-30
CSN396 - 4 2026-06-30
CSN3085 - 4 2026-07-02
CSN8138 China Southern Airlines 3 2026-04-29
CSN5047 - 3 2026-07-14
CSN8137 China Southern Airlines 2 2026-04-28
CSN390 China Southern Airlines 2 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CSN5047 - Jul 14, 07:15 UTCJul 14, 07:25 UTC10m
2026-07-13 CSN395 - Jul 13, 12:20 UTCJul 13, 12:40 UTC20m
2026-07-13 CSN395 - Jul 13, 09:30 UTCJul 13, 09:40 UTC10m
2026-07-12 CSN5047 - Jul 12, 06:10 UTCJul 12, 06:25 UTC15m
2026-07-11 CSN395 - Jul 11, 12:10 UTCJul 11, 12:30 UTC20m
2026-07-11 CSN395 - Jul 11, 09:15 UTCJul 11, 09:30 UTC15m
2026-07-10 CSN626 - Jul 10, 21:00 UTCJul 10, 21:35 UTC35m
2026-07-10 CSN625 - Jul 10, 10:55 UTCJul 10, 19:15 UTC8h 20m
2026-07-10 CSN8159 - Jul 10, 02:10 UTCJul 10, 02:20 UTC10m
2026-07-09 CSN388 - Jul 9, 06:40 UTCJul 9, 07:05 UTC25m
2026-07-09 CSN388 - Jul 9, 02:35 UTCJul 9, 04:05 UTC1h 30m
2026-07-08 CSN387 - Jul 8, 17:55 UTCJul 8, 18:10 UTC15m
2026-07-08 CSN387 CAN → CGK Jul 8, 13:55 UTCJul 8, 14:05 UTC10m
2026-07-07 CSN3038 - Jul 7, 10:30 UTCJul 7, 10:50 UTC20m
2026-07-07 CSN3038 - Jul 7, 06:25 UTCJul 7, 07:50 UTC1h 25m
2026-07-07 CSN3037 - Jul 7, 04:30 UTCJul 7, 04:50 UTC20m
2026-07-06 CSN8159 - Jul 6, 01:20 UTCJul 6, 01:40 UTC20m
2026-07-05 CSN8336 - Jul 5, 13:35 UTCJul 5, 13:55 UTC20m
2026-07-05 CSN8336 - Jul 5, 11:25 UTCJul 5, 11:55 UTC30m
2026-07-05 CSN8335 - Jul 5, 07:25 UTCJul 5, 10:10 UTC2h 45m
2026-07-05 CSN8482 - Jul 5, 04:55 UTCJul 5, 05:15 UTC20m
2026-07-04 CSN8481 - Jul 4, 19:00 UTCJul 5, 03:05 UTC8h 5m
2026-07-03 CSN3086 - Jul 3, 01:55 UTCJul 3, 03:35 UTC1h 40m
2026-07-02 CSN3085 - Jul 2, 09:20 UTCJul 2, 10:55 UTC1h 35m
2026-07-02 CSN8482 - Jul 2, 05:05 UTCJul 2, 05:20 UTC15m
2026-07-01 CSN8481 - Jul 1, 18:55 UTCJul 2, 03:20 UTC8h 25m
2026-06-30 CSN5048 - Jun 30, 13:40 UTCJun 30, 13:55 UTC15m
2026-06-30 CSN5048 - Jun 30, 11:20 UTCJun 30, 11:30 UTC10m
2026-06-30 CSN396 - Jun 30, 03:25 UTCJun 30, 03:35 UTC10m
2026-06-30 CSN396 - Jun 30, 01:00 UTCJun 30, 01:09 UTC10m
2026-06-29 CSN395 - Jun 29, 12:14 UTCJun 29, 12:34 UTC20m
2026-06-29 CSN395 - Jun 29, 09:20 UTCJun 29, 09:29 UTC10m
2026-06-29 CSN388 - Jun 29, 06:54 UTCJun 29, 07:09 UTC15m
2026-06-29 CSN388 - Jun 29, 02:30 UTCJun 29, 04:00 UTC1h 30m
2026-06-28 CSN387 CAN → CGK Jun 28, 16:14 UTCJun 28, 16:29 UTC15m
2026-06-28 CSN387 CAN → CGK Jun 28, 12:09 UTCJun 28, 12:19 UTC10m
2026-06-28 CSN8490 - Jun 28, 00:04 UTCJun 28, 00:25 UTC20m
2026-06-27 CSN8490 - Jun 27, 20:55 UTCJun 27, 21:19 UTC25m
2026-06-27 CSN8489 - Jun 27, 16:20 UTCJun 27, 19:34 UTC3h 15m
2026-06-26 CSN5048 PEN → CAN Jun 26, 13:45 UTCJun 26, 13:59 UTC15m
2026-06-26 CSN5048 PEN → CAN Jun 26, 11:14 UTCJun 26, 11:24 UTC10m
2026-06-26 CSN5047 - Jun 26, 06:19 UTCJun 26, 06:29 UTC10m
2026-06-25 CSN8988 - Jun 25, 03:54 UTCJun 25, 08:34 UTC4h 40m
2026-06-24 CSN626 - Jun 24, 21:00 UTCJun 24, 21:24 UTC25m
2026-06-24 CSN625 - Jun 24, 10:59 UTCJun 24, 19:10 UTC8h 10m
2026-06-24 CSN8159 - Jun 24, 01:24 UTCJun 24, 07:10 UTC5h 45m
2026-06-23 CSN8336 - Jun 23, 13:24 UTCJun 23, 13:39 UTC15m
2026-06-23 CSN8336 - Jun 23, 11:19 UTCJun 23, 11:40 UTC20m
2026-06-23 CSN8335 - Jun 23, 07:35 UTCJun 23, 10:10 UTC2h 35m
2026-06-23 CSN8482 - Jun 23, 04:50 UTCJun 23, 05:09 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 8h 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, CSN625, CSN626, CSN8481.