Apparatus

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sensors Mode-S transponder

781AFD

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-322A · AIRBUS A-321neo

Hex
781AFD
Octal
36015375
Decimal
7,871,229
Country
CN
Tail
B-322A
Type
A21N
No current signal · last broadcast 4h ago
Flights observed
177
Distinct callsigns
20
Country
CN
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 781AFD.

Country allocation

The ICAO 24-bit address 781AFD 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 - 20 2026-06-25
CSN3037 - 16 2026-06-25
CSN8336 - 10 2026-07-12
CSN8490 - 8 2026-07-05
CSN626 - 8 2026-07-05
CSN8481 - 7 2026-07-12
CSN8335 - 7 2026-07-12
CSN625 - 7 2026-07-05
CSN8489 - 6 2026-07-04
CSN5048 China Southern Airlines 6 2026-06-24
CSN3086 - 6 2026-07-14
CSN8482 - 5 2026-07-13
CSN8137 - 5 2026-07-11
CSN388 - 5 2026-06-17
CSN3085 - 5 2026-07-13
CSN8138 - 4 2026-07-12
CSN396 China Southern Airlines 4 2026-06-18
CSN395 - 4 2026-06-17
CSN389 China Southern Airlines 4 2026-05-12
CSN387 China Southern Airlines 4 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CSN3086 - Jul 14, 05:45 UTCJul 14, 06:00 UTC15m
2026-07-14 CSN3086 - Jul 14, 02:00 UTCJul 14, 03:30 UTC1h 30m
2026-07-13 CSN3085 - Jul 13, 09:35 UTCJul 13, 11:10 UTC1h 35m
2026-07-13 CSN3085 - Jul 13, 07:20 UTCJul 13, 07:35 UTC15m
2026-07-13 CSN8482 - Jul 13, 05:25 UTCJul 13, 05:45 UTC20m
2026-07-12 CSN8481 - Jul 12, 18:40 UTCJul 13, 04:35 UTC9h 55m
2026-07-12 CSN8336 - Jul 12, 14:30 UTCJul 12, 14:55 UTC25m
2026-07-12 CSN8336 - Jul 12, 12:01 UTCJul 12, 13:35 UTC1h 35m
2026-07-12 CSN8335 - Jul 12, 10:30 UTCJul 12, 10:50 UTC20m
2026-07-12 CSN8335 - Jul 12, 08:10 UTCJul 12, 08:30 UTC20m
2026-07-12 CSN8138 - Jul 12, 04:55 UTCJul 12, 05:15 UTC20m
2026-07-11 CSN8137 - Jul 11, 10:20 UTCJul 12, 03:10 UTC16h 50m
2026-07-10 CSN6057 - Jul 10, 14:10 UTCJul 11, 05:45 UTC15h 35m
2026-07-10 CSN3850 - Jul 10, 09:05 UTCJul 10, 09:25 UTC20m
2026-07-09 CSN3595 - Jul 9, 12:25 UTCJul 9, 13:10 UTC45m
2026-07-09 CSN6851 - Jul 9, 03:20 UTCJul 9, 07:30 UTC4h 10m
2026-07-06 CSN3619 - Jul 6, 02:45 UTCJul 6, 02:55 UTC10m
2026-07-05 CSN626 - Jul 5, 22:45 UTCJul 5, 23:00 UTC15m
2026-07-05 CSN625 - Jul 5, 13:00 UTCJul 5, 21:10 UTC8h 10m
2026-07-05 CSN8490 - Jul 5, 00:20 UTCJul 5, 00:40 UTC20m
2026-07-04 CSN8490 - Jul 4, 21:15 UTCJul 4, 21:35 UTC20m
2026-07-04 CSN8489 - Jul 4, 16:50 UTCJul 4, 19:50 UTC3h 0m
2026-07-03 CSN3493 - Jul 3, 02:55 UTCJul 3, 10:50 UTC7h 55m
2026-06-25 CSN3038 - Jun 25, 12:15 UTCJun 25, 12:40 UTC25m
2026-06-25 CSN3038 - Jun 25, 08:09 UTCJun 25, 09:34 UTC1h 25m
2026-06-25 CSN3037 - Jun 25, 06:20 UTCJun 25, 06:30 UTC10m
2026-06-24 CSN5048 PEN → CAN Jun 24, 13:14 UTCJun 24, 13:34 UTC20m
2026-06-24 CSN5048 PEN → CAN Jun 24, 11:05 UTCJun 24, 11:14 UTC10m
2026-06-24 CSN5047 - Jun 24, 09:15 UTCJun 24, 09:34 UTC20m
2026-06-24 CSN5047 - Jun 24, 06:20 UTCJun 24, 06:29 UTC10m
2026-06-23 CSN3038 - Jun 23, 10:49 UTCJun 23, 11:10 UTC20m
2026-06-23 CSN3038 - Jun 23, 06:44 UTCJun 23, 08:09 UTC1h 25m
2026-06-23 CSN3037 - Jun 23, 04:50 UTCJun 23, 05:09 UTC20m
2026-06-23 CSN3037 - Jun 23, 00:39 UTCJun 23, 00:54 UTC15m
2026-06-22 CSN626 - Jun 22, 21:14 UTCJun 22, 21:35 UTC20m
2026-06-22 CSN625 - Jun 22, 10:49 UTCJun 22, 19:24 UTC8h 35m
2026-06-22 CSN8160 SGN → CAN Jun 22, 06:15 UTCJun 22, 06:35 UTC20m
2026-06-22 CSN8159 - Jun 22, 01:15 UTCJun 22, 01:25 UTC10m
2026-06-21 CSN8336 - Jun 21, 11:20 UTCJun 21, 13:50 UTC2h 30m
2026-06-21 CSN8335 - Jun 21, 07:34 UTCJun 21, 09:59 UTC2h 25m
2026-06-21 CSN8138 - Jun 21, 04:44 UTCJun 21, 05:04 UTC20m
2026-06-20 CSN8137 - Jun 20, 09:59 UTCJun 21, 03:00 UTC17h 0m
2026-06-19 CSN3038 - Jun 19, 11:49 UTCJun 19, 12:04 UTC15m
2026-06-19 CSN3038 - Jun 19, 07:39 UTCJun 19, 09:14 UTC1h 35m
2026-06-19 CSN3037 - Jun 19, 05:45 UTCJun 19, 06:04 UTC20m
2026-06-18 CSN5048 PEN → CAN Jun 18, 16:55 UTCJun 18, 17:15 UTC20m
2026-06-18 CSN5048 PEN → CAN Jun 18, 14:30 UTCJun 18, 14:40 UTC10m
2026-06-18 CSN5047 - Jun 18, 12:50 UTCJun 18, 13:05 UTC15m
2026-06-18 CSN396 PEN → CAN Jun 18, 03:10 UTCJun 18, 03:20 UTC10m
2026-06-18 CSN396 PEN → CAN Jun 18, 01:00 UTCJun 18, 01:10 UTC10m

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-322A page for operator, model, and routing details .

Mode-S 781AFD frequently asked

What is Mode-S code 781AFD?
781AFD is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-322A.
Where is Mode-S 781AFD registered?
Mode-S code 781AFD is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781AFD 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 781AFD, octal 36015375, decimal 7,871,229.
What flights does 781AFD operate?
Mode-S 781AFD has broadcast 20 distinct callsigns, including CSN3038, CSN3037, CSN8336, CSN8490, CSN626.