Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781E81

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32CS · AIRBUS A-321neo

Hex
781E81
Octal
36017201
Decimal
7,872,129
Country
CN
Tail
B-32CS
Type
A21N
No current signal · last broadcast 7h ago
Flights observed
53
Distinct callsigns
17
Country
CN
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 781E81.

Country allocation

The ICAO 24-bit address 781E81 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 17 distinct

Callsign Airline Flights Last seen
CSN317 China Southern Airlines 8 2026-05-17
CSN355 China Southern Airlines 6 2026-05-29
CSN318 China Southern Airlines 6 2026-05-16
CSN5097 China Southern Airlines 5 2026-06-02
CSN5067 China Southern Airlines 5 2026-05-09
CSN356 China Southern Airlines 5 2026-05-29
CSN5068 China Southern Airlines 4 2026-05-09
CSN5098 China Southern Airlines 3 2026-06-02
CSN8010 China Southern Airlines 2 2026-05-13
CSN8009 China Southern Airlines 2 2026-05-13
CSN6909 China Southern Airlines 1 2026-05-06
CSN6904 China Southern Airlines 1 2026-05-06
CSN5003 China Southern Airlines 1 2026-04-20
CSN3194 China Southern Airlines 1 2026-04-22
CSN3193 China Southern Airlines 1 2026-04-22
CSN316 China Southern Airlines 1 2026-05-20
CSN315 China Southern Airlines 1 2026-05-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 CSN5098 ALA → PKX Jun 2, 21:30 UTCJun 2, 21:40 UTC10m
2026-06-02 CSN5097 PKX → ALA Jun 2, 10:50 UTCJun 2, 11:05 UTC15m
2026-05-29 CSN5098 ALA → PKX May 29, 21:40 UTCMay 29, 21:50 UTC10m
2026-05-29 CSN5097 PKX → ALA May 29, 10:55 UTCMay 29, 11:10 UTC15m
2026-05-29 CSN356 HKG → PKX May 29, 05:50 UTCMay 29, 06:10 UTC20m
2026-05-29 CSN355 PKX → HKG May 29, 03:15 UTCMay 29, 04:00 UTC45m
2026-05-24 CSN356 HKG → PKX May 24, 06:10 UTCMay 24, 06:30 UTC20m
2026-05-24 CSN355 PKX → HKG May 24, 04:00 UTCMay 24, 04:30 UTC30m
2026-05-20 CSN316 ICN → PKX May 20, 01:00 UTCMay 20, 01:20 UTC20m
2026-05-19 CSN315 PKX → ICN May 19, 12:30 UTCMay 19, 12:50 UTC20m
2026-05-18 CSN5097 PKX → ALA May 18, 10:45 UTCMay 18, 21:40 UTC10h 54m
2026-05-18 CSN356 HKG → PKX May 18, 05:50 UTCMay 18, 06:10 UTC20m
2026-05-18 CSN355 PKX → HKG May 18, 03:45 UTCMay 18, 04:15 UTC30m
2026-05-17 CSN355 PKX → HKG May 17, 04:35 UTCMay 18, 04:15 UTC23h 40m
2026-05-17 CSN317 PKX → GMP May 17, 02:30 UTCMay 17, 02:55 UTC25m
2026-05-16 CSN318 GMP → PKX May 16, 04:40 UTCMay 16, 05:00 UTC20m
2026-05-16 CSN317 PKX → GMP May 16, 02:30 UTCMay 16, 02:50 UTC20m
2026-05-15 CSN356 HKG → PKX May 15, 07:45 UTCMay 15, 08:05 UTC20m
2026-05-15 CSN355 PKX → HKG May 15, 03:10 UTCMay 15, 03:45 UTC35m
2026-05-14 CSN318 GMP → PKX May 14, 04:55 UTCMay 14, 05:10 UTC15m
2026-05-14 CSN317 PKX → GMP May 14, 02:30 UTCMay 14, 02:55 UTC25m
2026-05-13 CSN8010 DAC → PKX May 13, 16:10 UTCMay 13, 17:00 UTC50m
2026-05-13 CSN8009 PKX → DAC May 13, 13:31 UTCMay 13, 14:35 UTC1h 5m
2026-05-10 CSN318 GMP → PKX May 10, 04:29 UTCMay 10, 04:50 UTC20m
2026-05-10 CSN317 PKX → GMP May 10, 02:30 UTCMay 10, 02:45 UTC15m
2026-05-09 CSN5068 FRU → PKX May 9, 21:50 UTCMay 9, 22:05 UTC15m
2026-05-09 CSN5067 PKX → FRU May 9, 10:40 UTCMay 9, 10:55 UTC15m
2026-05-07 CSN5067 PKX → FRU May 7, 10:50 UTCMay 7, 22:00 UTC11h 10m
2026-05-06 CSN6909 URC → PKX May 6, 15:35 UTCMay 6, 15:45 UTC10m
2026-05-06 CSN6904 PKX → URC May 6, 01:20 UTCMay 6, 01:35 UTC15m
2026-05-02 CSN5068 FRU → PKX May 2, 22:10 UTCMay 2, 22:25 UTC15m
2026-05-02 CSN5067 PKX → FRU May 2, 10:40 UTCMay 2, 11:00 UTC20m
2026-05-01 CSN356 HKG → PKX May 1, 05:50 UTCMay 1, 06:05 UTC15m
2026-05-01 CSN355 PKX → HKG May 1, 03:25 UTCMay 1, 03:55 UTC30m
2026-04-30 CSN5068 FRU → PKX Apr 30, 21:40 UTCApr 30, 21:55 UTC15m
2026-04-30 CSN5067 PKX → FRU Apr 30, 10:30 UTCApr 30, 10:45 UTC15m
2026-04-28 CSN5097 PKX → ALA Apr 28, 10:55 UTCApr 28, 11:10 UTC15m
2026-04-27 CSN318 GMP → PKX Apr 27, 04:35 UTCApr 27, 05:05 UTC30m
2026-04-27 CSN317 PKX → GMP Apr 27, 02:35 UTCApr 27, 02:55 UTC20m
2026-04-26 CSN5097 PKX → ALA Apr 26, 10:50 UTCApr 26, 11:15 UTC25m
2026-04-24 CSN8010 DAC → PKX Apr 24, 16:00 UTCApr 24, 16:50 UTC50m
2026-04-24 CSN8009 PKX → DAC Apr 24, 04:45 UTCApr 24, 14:35 UTC9h 50m
2026-04-24 CSN317 PKX → GMP Apr 24, 02:30 UTCApr 24, 02:55 UTC25m
2026-04-23 CSN318 GMP → PKX Apr 23, 04:55 UTCApr 23, 05:15 UTC20m
2026-04-23 CSN317 PKX → GMP Apr 23, 02:30 UTCApr 23, 02:55 UTC25m
2026-04-22 CSN5098 ALA → PKX Apr 22, 11:00 UTCApr 22, 21:35 UTC10h 35m
2026-04-22 CSN3193 SZX → PKX Apr 22, 05:01 UTCApr 22, 05:15 UTC15m
2026-04-22 CSN3194 PKX → SZX Apr 22, 03:05 UTCApr 22, 03:15 UTC10m
2026-04-20 CSN5003 PKX → FRU Apr 20, 15:55 UTCApr 21, 03:25 UTC11h 30m
2026-04-18 CSN5068 FRU → PKX Apr 18, 21:35 UTCApr 18, 21:50 UTC15m

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-32CS page for operator, model, and routing details .

Mode-S 781E81 frequently asked

What is Mode-S code 781E81?
781E81 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32CS.
Where is Mode-S 781E81 registered?
Mode-S code 781E81 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781E81 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781E81, octal 36017201, decimal 7,872,129.
What flights does 781E81 operate?
Mode-S 781E81 has broadcast 17 distinct callsigns, including CSN317, CSN355, CSN318, CSN5097, CSN5067.