Apparatus

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sensors Mode-S transponder

781B6F

ICAO 24-bit transponder address · allocated to China

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

Hex
781B6F
Octal
36015557
Decimal
7,871,343
Country
CN
Tail
B-323F
Type
A21N
No current signal · last broadcast 9h ago
Flights observed
50
Distinct callsigns
20
Country
CN
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S 781B6F.

Country allocation

The ICAO 24-bit address 781B6F 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
CSN318 China Southern Airlines 7 2026-06-03
CSN317 China Southern Airlines 7 2026-06-03
CSN5097 China Southern Airlines 4 2026-05-04
CSN6028 China Southern Airlines 3 2026-06-02
CSN5098 China Southern Airlines 3 2026-05-04
CSN5068 China Southern Airlines 3 2026-05-28
CSN356 China Southern Airlines 3 2026-05-28
CSN355 China Southern Airlines 3 2026-05-28
CSN6027 China Southern Airlines 2 2026-05-30
CSN5067 China Southern Airlines 2 2026-05-28
CSN5004 China Southern Airlines 2 2026-05-07
CSN5003 China Southern Airlines 2 2026-05-06
CSN3193 China Southern Airlines 2 2026-05-09
CSN8991 China Southern Airlines 1 2026-04-19
CSN8909 China Southern Airlines 1 2026-06-01
CSN8010 China Southern Airlines 1 2026-05-08
CSN8009 China Southern Airlines 1 2026-05-08
CSN6992 China Southern Airlines 1 2026-06-04
CSN6082 China Southern Airlines 1 2026-05-25
CSN3194 China Southern Airlines 1 2026-04-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-04 CSN6992 NAO → PKX Jun 4, 06:15 UTCJun 4, 06:50 UTC35m
2026-06-03 CSN318 GMP → PKX Jun 3, 04:50 UTCJun 3, 05:15 UTC25m
2026-06-03 CSN317 PKX → GMP Jun 3, 02:40 UTCJun 3, 03:10 UTC30m
2026-06-02 CSN6028 TAS → PKX Jun 2, 22:00 UTCJun 2, 22:10 UTC10m
2026-06-01 CSN8909 PKX → SYX Jun 1, 04:40 UTCJun 1, 05:00 UTC20m
2026-05-30 CSN6028 TAS → PKX May 30, 21:55 UTCMay 30, 22:10 UTC15m
2026-05-30 CSN6027 PKX → TAS May 30, 09:30 UTCMay 30, 09:55 UTC25m
2026-05-29 CSN318 GMP → PKX May 29, 05:20 UTCMay 29, 05:45 UTC25m
2026-05-29 CSN317 PKX → GMP May 29, 02:20 UTCMay 29, 02:50 UTC30m
2026-05-28 CSN5068 FRU → PKX May 28, 21:40 UTCMay 28, 21:55 UTC15m
2026-05-28 CSN5067 PKX → FRU May 28, 10:35 UTCMay 28, 10:55 UTC20m
2026-05-28 CSN356 HKG → PKX May 28, 05:50 UTCMay 28, 06:15 UTC25m
2026-05-28 CSN355 PKX → HKG May 28, 03:20 UTCMay 28, 03:50 UTC30m
2026-05-26 CSN6028 TAS → PKX May 26, 21:49 UTCMay 26, 22:05 UTC15m
2026-05-26 CSN6027 PKX → TAS May 26, 09:29 UTCMay 26, 09:55 UTC25m
2026-05-25 CSN6082 MFM → PKX May 25, 08:00 UTCMay 25, 08:10 UTC10m
2026-05-15 CSN318 GMP → PKX May 15, 05:00 UTCMay 15, 05:20 UTC20m
2026-05-15 CSN317 PKX → GMP May 15, 02:30 UTCMay 15, 02:55 UTC25m
2026-05-13 CSN318 GMP → PKX May 13, 04:45 UTCMay 13, 05:00 UTC15m
2026-05-13 CSN317 PKX → GMP May 13, 02:35 UTCMay 13, 02:50 UTC15m
2026-05-12 CSN356 HKG → PKX May 12, 05:50 UTCMay 12, 06:05 UTC15m
2026-05-12 CSN355 PKX → HKG May 12, 03:10 UTCMay 12, 03:50 UTC40m
2026-05-09 CSN3193 SZX → PKX May 9, 04:50 UTCMay 9, 05:05 UTC15m
2026-05-08 CSN8010 DAC → PKX May 8, 16:00 UTCMay 8, 16:55 UTC55m
2026-05-08 CSN8009 PKX → DAC May 8, 13:25 UTCMay 8, 14:35 UTC1h 10m
2026-05-07 CSN5004 VCV → MHV May 7, 03:15 UTCMay 7, 03:30 UTC15m
2026-05-06 CSN5003 PKX → FRU May 6, 15:45 UTCMay 6, 16:10 UTC25m
2026-05-05 CSN318 GMP → PKX May 5, 04:45 UTCMay 5, 05:00 UTC15m
2026-05-05 CSN317 PKX → GMP May 5, 02:40 UTCMay 5, 02:50 UTC10m
2026-05-04 CSN5098 ALA → PKX May 4, 21:25 UTCMay 4, 21:40 UTC15m
2026-05-04 CSN5097 PKX → ALA May 4, 10:45 UTCMay 4, 11:10 UTC25m
2026-05-02 CSN5004 VCV → MHV May 2, 03:15 UTCMay 2, 03:30 UTC15m
2026-05-01 CSN5003 PKX → FRU May 1, 15:45 UTCMay 1, 16:10 UTC25m
2026-04-30 CSN318 GMP → PKX Apr 30, 04:40 UTCApr 30, 05:00 UTC20m
2026-04-30 CSN317 PKX → GMP Apr 30, 02:35 UTCApr 30, 02:55 UTC20m
2026-04-29 CSN5098 ALA → PKX Apr 29, 21:25 UTCApr 29, 21:40 UTC15m
2026-04-29 CSN5097 PKX → ALA Apr 29, 10:45 UTCApr 29, 11:00 UTC15m
2026-04-25 CSN5068 FRU → PKX Apr 25, 21:35 UTCApr 25, 21:50 UTC15m
2026-04-25 CSN5067 PKX → FRU Apr 25, 10:30 UTCApr 25, 11:00 UTC30m
2026-04-25 CSN3193 SZX → PKX Apr 25, 04:45 UTCApr 25, 05:00 UTC15m
2026-04-25 CSN3194 PKX → SZX Apr 25, 02:45 UTCApr 25, 02:55 UTC10m
2026-04-23 CSN5098 ALA → PKX Apr 23, 21:35 UTCApr 23, 21:50 UTC15m
2026-04-23 CSN5097 PKX → ALA Apr 23, 10:50 UTCApr 23, 11:15 UTC25m
2026-04-21 CSN5068 FRU → PKX Apr 21, 21:45 UTCApr 21, 22:00 UTC15m
2026-04-21 CSN356 HKG → PKX Apr 21, 05:50 UTCApr 21, 06:15 UTC25m
2026-04-21 CSN355 PKX → HKG Apr 21, 03:15 UTCApr 21, 03:50 UTC35m
2026-04-19 CSN8991 PKX → NNG Apr 19, 08:55 UTCApr 19, 09:10 UTC15m
2026-04-19 CSN318 GMP → PKX Apr 19, 04:30 UTCApr 19, 04:50 UTC20m
2026-04-19 CSN317 PKX → GMP Apr 19, 02:25 UTCApr 19, 02:45 UTC20m
2026-04-18 CSN5097 PKX → ALA Apr 18, 10:45 UTCApr 18, 10:55 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-323F page for operator, model, and routing details .

Mode-S 781B6F frequently asked

What is Mode-S code 781B6F?
781B6F is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-323F.
Where is Mode-S 781B6F registered?
Mode-S code 781B6F is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781B6F broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781B6F, octal 36015557, decimal 7,871,343.
What flights does 781B6F operate?
Mode-S 781B6F has broadcast 20 distinct callsigns, including CSN318, CSN317, CSN5097, CSN6028, CSN5098.