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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
Broadcasting now · callsign CSN356 · 29,100 ft
Flights observed
39
Distinct callsigns
15
Country
CN
Last broadcast
2h ago

Current position

781B8D is currently broadcasting. Map zoomed to live position.

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 15 distinct

Callsign Airline Flights Last seen
CSN355 China Southern Airlines 6 2026-06-03
CSN356 China Southern Airlines 5 2026-05-30
CSN318 China Southern Airlines 5 2026-05-25
CSN317 China Southern Airlines 5 2026-05-25
CSN5068 China Southern Airlines 3 2026-06-02
CSN5067 China Southern Airlines 3 2026-06-02
CSN8871 China Southern Airlines 2 2026-05-27
CSN5098 China Southern Airlines 2 2026-05-21
CSN5097 China Southern Airlines 2 2026-05-21
CSN8930 China Southern Airlines 1 2026-04-24
CSN8909 China Southern Airlines 1 2026-04-26
CSN6028 China Southern Airlines 1 2026-05-28
CSN3168 China Southern Airlines 1 2026-04-17
CSN3167 China Southern Airlines 1 2026-05-15
CSN3157 China Southern Airlines 1 2026-04-17

Recent flights last 39

DateFlightRouteTakeoffLandingDuration
2026-06-03 CSN355 PKX → HKG Jun 3, 03:20 UTCJun 3, 04:00 UTC40m
2026-06-02 CSN5068 FRU → PKX Jun 2, 21:35 UTCJun 2, 21:50 UTC15m
2026-06-02 CSN5067 PKX → FRU Jun 2, 10:40 UTCJun 2, 11:00 UTC20m
2026-05-30 CSN5068 FRU → PKX May 30, 21:30 UTCMay 30, 21:45 UTC15m
2026-05-30 CSN5067 PKX → FRU May 30, 11:00 UTCMay 30, 11:15 UTC15m
2026-05-30 CSN356 HKG → PKX May 30, 06:25 UTCMay 30, 06:45 UTC20m
2026-05-30 CSN355 PKX → HKG May 30, 03:15 UTCMay 30, 03:55 UTC40m
2026-05-28 CSN6028 TAS → PKX May 28, 21:55 UTCMay 28, 22:10 UTC15m
2026-05-27 CSN8871 PKX → DQA May 27, 11:15 UTCMay 27, 11:25 UTC10m
2026-05-25 CSN318 GMP → PKX May 25, 04:40 UTCMay 25, 05:05 UTC25m
2026-05-25 CSN317 PKX → GMP May 25, 02:25 UTCMay 25, 02:50 UTC25m
2026-05-23 CSN356 HKG → PKX May 23, 06:00 UTCMay 23, 06:20 UTC20m
2026-05-23 CSN355 PKX → HKG May 23, 03:10 UTCMay 23, 03:55 UTC45m
2026-05-22 CSN318 GMP → PKX May 22, 04:50 UTCMay 23, 03:15 UTC22h 24m
2026-05-22 CSN317 PKX → GMP May 22, 02:35 UTCMay 22, 02:55 UTC20m
2026-05-21 CSN5098 ALA → PKX May 21, 21:20 UTCMay 21, 21:30 UTC10m
2026-05-21 CSN5097 PKX → ALA May 21, 10:55 UTCMay 21, 11:10 UTC15m
2026-05-20 CSN318 GMP → PKX May 20, 04:55 UTCMay 20, 05:25 UTC30m
2026-05-20 CSN317 PKX → GMP May 20, 02:30 UTCMay 20, 03:00 UTC30m
2026-05-19 CSN5068 FRU → PKX May 19, 21:35 UTCMay 19, 21:50 UTC15m
2026-05-19 CSN5067 PKX → FRU May 19, 10:30 UTCMay 19, 10:50 UTC20m
2026-05-17 CSN8871 PKX → DQA May 17, 11:35 UTCMay 17, 11:45 UTC10m
2026-05-17 CSN356 HKG → PKX May 17, 06:10 UTCMay 17, 06:30 UTC20m
2026-05-17 CSN355 PKX → HKG May 17, 03:15 UTCMay 17, 03:50 UTC35m
2026-05-16 CSN356 HKG → PKX May 16, 06:10 UTCMay 17, 03:50 UTC21h 40m
2026-05-16 CSN355 PKX → HKG May 16, 03:15 UTCMay 16, 03:55 UTC40m
2026-05-15 CSN3167 SZX → PKX May 15, 07:55 UTCMay 15, 08:10 UTC15m
2026-05-14 CSN356 HKG → PKX May 14, 05:40 UTCMay 14, 06:00 UTC20m
2026-05-14 CSN355 PKX → HKG May 14, 03:30 UTCMay 14, 04:10 UTC40m
2026-04-26 CSN8909 PKX → SYX Apr 26, 01:55 UTCApr 26, 02:10 UTC15m
2026-04-24 CSN8930 LHW → PKX Apr 24, 04:55 UTCApr 24, 05:05 UTC10m
2026-04-21 CSN318 GMP → PKX Apr 21, 05:05 UTCApr 21, 05:25 UTC20m
2026-04-21 CSN317 PKX → GMP Apr 21, 02:15 UTCApr 21, 02:40 UTC25m
2026-04-20 CSN5098 ALA → PKX Apr 20, 21:30 UTCApr 20, 21:45 UTC15m
2026-04-20 CSN5097 PKX → ALA Apr 20, 11:05 UTCApr 20, 11:30 UTC25m
2026-04-17 CSN3157 SZX → PKX Apr 17, 08:50 UTCApr 17, 09:05 UTC15m
2026-04-17 CSN3168 PKX → SZX Apr 17, 05:55 UTCApr 17, 06:15 UTC20m
2026-04-16 CSN318 GMP → PKX Apr 16, 04:44 UTCApr 16, 05:05 UTC20m
2026-04-16 CSN317 PKX → GMP Apr 16, 02:34 UTCApr 16, 02:54 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-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?
Yes. Mode-S 781B8D is currently airborne.
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 15 distinct callsigns, including CSN355, CSN356, CSN318, CSN317, CSN5068.