Apparatus

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sensors Mode-S transponder

781B8D

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-323S · AIRBUS A-321neo

Hex
781B8D
Octal
36015615
Decimal
7,871,373
Country
CN
Tail
B-323S
Type
A21N
No current signal · last broadcast Jul 26, 12:20 UTC
Flights observed
118
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 12:20 UTC

Last known position

Most recent position reported by Mode-S 781B8D.

Country allocation

The ICAO 24-bit address 781B8D 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
CSN356 China Southern Airlines 14 2026-07-24
CSN317 China Southern Airlines 14 2026-07-25
CSN355 China Southern Airlines 13 2026-07-24
CSN318 China Southern Airlines 13 2026-07-25
CSN5067 China Southern Airlines 10 2026-07-21
CSN5098 China Southern Airlines 8 2026-07-24
CSN5097 China Southern Airlines 8 2026-07-24
CSN5068 China Southern Airlines 8 2026-07-21
CSN8871 - 3 2026-07-05
CSN8930 - 2 2026-06-20
CSN8568 China Southern Airlines 2 2026-07-06
CSN8010 - 2 2026-07-17
CSN8009 - 2 2026-07-17
CSN6028 China Southern Airlines 2 2026-06-06
CSN5389 China Southern Airlines 2 2026-07-26
CSN8996 - 1 2026-07-07
CSN8995 - 1 2026-07-06
CSN8922 - 1 2026-07-12
CSN8909 China Southern Airlines 1 2026-04-26
CSN8848 China Southern Airlines 1 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN5389 HTN → PKX Jul 26, 12:10 UTCJul 26, 12:20 UTC10m
2026-07-25 CSN6159 PKX → KMG Jul 25, 09:15 UTCJul 25, 09:25 UTC10m
2026-07-25 CSN318 GMP → PKX Jul 25, 04:40 UTCJul 25, 05:10 UTC30m
2026-07-25 CSN317 PKX → GMP Jul 25, 02:45 UTCJul 25, 03:10 UTC25m
2026-07-24 CSN5098 ALA → PKX Jul 24, 21:25 UTCJul 24, 21:55 UTC30m
2026-07-24 CSN5097 PKX → ALA Jul 24, 10:45 UTCJul 24, 11:05 UTC20m
2026-07-24 CSN356 HKG → PKX Jul 24, 07:55 UTCJul 24, 08:30 UTC35m
2026-07-24 CSN356 HKG → PKX Jul 24, 05:55 UTCJul 24, 06:15 UTC20m
2026-07-24 CSN355 PKX → HKG Jul 24, 03:30 UTCJul 24, 04:10 UTC40m
2026-07-21 CSN5068 FRU → PKX Jul 21, 21:50 UTCJul 21, 22:15 UTC25m
2026-07-21 CSN5067 PKX → FRU Jul 21, 10:40 UTCJul 21, 10:55 UTC15m
2026-07-21 CSN356 HKG → PKX Jul 21, 05:45 UTCJul 21, 06:00 UTC15m
2026-07-21 CSN355 PKX → HKG Jul 21, 03:30 UTCJul 21, 04:05 UTC35m
2026-07-20 CSN5389 HTN → PKX Jul 20, 12:25 UTCJul 20, 12:40 UTC15m
2026-07-19 CSN5098 - Jul 19, 21:30 UTCJul 19, 21:50 UTC20m
2026-07-19 CSN5097 PKX → ALA Jul 19, 10:50 UTCJul 19, 11:10 UTC20m
2026-07-19 CSN356 - Jul 19, 06:00 UTCJul 19, 06:20 UTC20m
2026-07-19 CSN355 PKX → HKG Jul 19, 03:45 UTCJul 19, 04:25 UTC40m
2026-07-17 CSN8010 - Jul 17, 16:04 UTCJul 17, 17:20 UTC1h 15m
2026-07-17 CSN8009 GMP → DAC Jul 17, 05:10 UTCJul 17, 13:50 UTC8h 40m
2026-07-17 CSN317 - Jul 17, 02:25 UTCJul 17, 02:54 UTC30m
2026-07-16 CSN8844 - Jul 16, 13:05 UTCJul 16, 13:20 UTC15m
2026-07-15 CSN318 - Jul 15, 05:00 UTCJul 15, 05:25 UTC25m
2026-07-15 CSN317 - Jul 15, 02:25 UTCJul 15, 02:55 UTC30m
2026-07-14 CSN5068 - Jul 14, 21:45 UTCJul 14, 22:00 UTC15m
2026-07-14 CSN5067 - Jul 14, 10:40 UTCJul 14, 10:50 UTC10m
2026-07-14 CSN356 - Jul 14, 06:05 UTCJul 14, 06:20 UTC15m
2026-07-14 CSN355 - Jul 14, 03:40 UTCJul 14, 04:10 UTC30m
2026-07-12 CSN8922 - Jul 12, 07:35 UTCJul 12, 07:50 UTC15m
2026-07-11 CSN8567 - Jul 11, 09:15 UTCJul 11, 09:30 UTC15m
2026-07-11 CSN318 - Jul 11, 04:40 UTCJul 11, 05:01 UTC20m
2026-07-11 CSN317 - Jul 11, 02:30 UTCJul 11, 02:50 UTC20m
2026-07-10 CSN5098 - Jul 10, 21:40 UTCJul 10, 21:50 UTC10m
2026-07-10 CSN5097 - Jul 10, 11:00 UTCJul 10, 11:20 UTC20m
2026-07-10 CSN356 - Jul 10, 06:00 UTCJul 10, 06:15 UTC15m
2026-07-10 CSN355 - Jul 10, 03:30 UTCJul 10, 04:05 UTC35m
2026-07-08 CSN8010 - Jul 8, 16:00 UTCJul 8, 17:05 UTC1h 5m
2026-07-08 CSN8009 - Jul 8, 12:30 UTCJul 8, 13:40 UTC1h 10m
2026-07-07 CSN6588 - Jul 7, 14:35 UTCJul 7, 14:45 UTC10m
2026-07-07 CSN8996 - Jul 7, 07:25 UTCJul 7, 08:05 UTC40m
2026-07-06 CSN8995 - Jul 6, 23:20 UTCJul 6, 23:40 UTC20m
2026-07-06 CSN8568 KMG → PKX Jul 6, 14:05 UTCJul 6, 14:20 UTC15m
2026-07-05 CSN8871 - Jul 5, 13:15 UTCJul 5, 13:45 UTC30m
2026-07-04 CSN5098 ALA → PKX Jul 4, 21:30 UTCJul 4, 21:40 UTC10m
2026-07-04 CSN5097 - Jul 4, 10:55 UTCJul 4, 11:05 UTC10m
2026-07-03 CSN318 - Jul 3, 04:45 UTCJul 3, 05:10 UTC25m
2026-07-03 CSN317 - Jul 3, 02:35 UTCJul 3, 02:55 UTC20m
2026-07-02 CSN5067 - Jul 2, 10:40 UTCJul 2, 21:50 UTC11h 10m
2026-07-02 CSN356 - Jul 2, 06:00 UTCJul 2, 06:20 UTC20m
2026-07-02 CSN355 - Jul 2, 03:35 UTCJul 2, 04:05 UTC30m

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-323S page for operator, model, and routing details .

Mode-S 781B8D frequently asked

What is Mode-S code 781B8D?
781B8D is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-323S.
Where is Mode-S 781B8D registered?
Mode-S code 781B8D is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781B8D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 12:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781B8D, octal 36015615, decimal 7,871,373.
What flights does 781B8D operate?
Mode-S 781B8D has broadcast 20 distinct callsigns, including CSN356, CSN317, CSN355, CSN318, CSN5067.