Apparatus

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sensors Mode-S transponder

781939

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-30EZ · AIRBUS A-320neo

Hex
781939
Octal
36014471
Decimal
7,870,777
Country
CN
Tail
B-30EZ
Type
A20N
No current signal · last broadcast 8d ago
Flights observed
74
Distinct callsigns
20
Country
CN
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S 781939.

Country allocation

The ICAO 24-bit address 781939 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
CSN5795 China Southern Airlines 7 2026-05-20
CSN8609 China Southern Airlines 5 2026-05-19
CSN8469 China Southern Airlines 4 2026-05-18
CSN8158 China Southern Airlines 4 2026-05-21
CSN6481 China Southern Airlines 4 2026-05-09
CSN5080 China Southern Airlines 4 2026-05-14
CSN8157 China Southern Airlines 3 2026-05-21
CSN5796 China Southern Airlines 3 2026-05-08
CSN5079 China Southern Airlines 3 2026-05-14
CSN8736 China Southern Airlines 2 2026-05-16
CSN8735 China Southern Airlines 2 2026-05-16
CSN6443 China Southern Airlines 2 2026-04-20
CSN3912 China Southern Airlines 2 2026-05-15
CSN3911 China Southern Airlines 2 2026-05-15
CSN3405 China Southern Airlines 2 2026-05-17
CSN3090 China Southern Airlines 2 2026-05-21
CSN3089 China Southern Airlines 2 2026-05-21
CSN8738 China Southern Airlines 1 2026-04-17
CSN8737 China Southern Airlines 1 2026-04-16
CSN8711 China Southern Airlines 1 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-22 CSN5633 SZX → SHE May 22, 04:05 UTCMay 22, 04:20 UTC15m
2026-05-21 CSN8158 BKK → SZX May 21, 22:00 UTCMay 21, 22:15 UTC15m
2026-05-21 CSN8158 BKK → SZX May 21, 19:55 UTCMay 21, 20:25 UTC30m
2026-05-21 CSN8157 SZX → BKK May 21, 16:01 UTCMay 21, 18:15 UTC2h 15m
2026-05-21 CSN3090 ICN → SZX May 21, 09:15 UTCMay 21, 09:30 UTC15m
2026-05-21 CSN3090 ICN → SZX May 21, 06:05 UTCMay 21, 06:30 UTC25m
2026-05-21 CSN3089 SZX → ICN May 21, 04:05 UTCMay 21, 04:40 UTC35m
2026-05-21 CSN3089 SZX → ICN May 21, 01:45 UTCMay 21, 02:00 UTC15m
2026-05-20 CSN5795 SZX → URC May 20, 01:40 UTCMay 20, 01:50 UTC10m
2026-05-19 CSN8609 SZX → URC May 19, 04:10 UTCMay 19, 04:25 UTC15m
2026-05-19 CSN8578 WUH → SZX May 19, 01:30 UTCMay 19, 01:40 UTC10m
2026-05-18 CSN8469 SZX → HAN May 18, 06:45 UTCMay 18, 07:05 UTC20m
2026-05-17 CSN3405 CAN → CKG May 17, 23:15 UTCMay 17, 23:30 UTC15m
2026-05-17 CSN5795 SZX → URC May 17, 01:10 UTCMay 17, 01:25 UTC15m
2026-05-16 CSN5756 AKA → SZX May 16, 15:16 UTCMay 16, 15:25 UTC10m
2026-05-16 CSN8736 TAO → SZX May 16, 08:26 UTCMay 16, 08:36 UTC10m
2026-05-16 CSN8735 SZX → TAO May 16, 01:05 UTCMay 16, 01:15 UTC10m
2026-05-15 CSN3912 WUH → SZX May 15, 18:00 UTCMay 15, 18:15 UTC15m
2026-05-15 CSN3911 SZX → WUH May 15, 00:30 UTCMay 15, 00:40 UTC10m
2026-05-14 CSN5080 KUL → SZX May 14, 21:20 UTCMay 14, 21:30 UTC10m
2026-05-14 CSN5080 KUL → SZX May 14, 17:55 UTCMay 14, 18:10 UTC15m
2026-05-14 CSN5079 SZX → KUL May 14, 15:50 UTCMay 14, 16:20 UTC30m
2026-05-14 CSN5079 SZX → KUL May 14, 13:01 UTCMay 14, 13:10 UTC10m
2026-05-13 CSN8158 BKK → SZX May 13, 22:15 UTCMay 13, 22:30 UTC15m
2026-05-13 CSN8158 BKK → SZX May 13, 20:20 UTCMay 13, 20:55 UTC35m
2026-05-13 CSN8157 SZX → BKK May 13, 16:50 UTCMay 13, 17:30 UTC40m
2026-05-13 CSN8157 SZX → BKK May 13, 15:10 UTCMay 13, 15:20 UTC10m
2026-05-13 CSN8469 SZX → HAN May 13, 07:25 UTCMay 13, 07:35 UTC10m
2026-05-13 CSN5854 SYX → SZX May 13, 05:50 UTCMay 13, 06:00 UTC10m
2026-05-13 CSN5853 SZX → SYX May 13, 00:30 UTCMay 13, 00:45 UTC15m
2026-05-12 CSN8469 SZX → HAN May 12, 06:55 UTCMay 12, 07:10 UTC15m
2026-05-12 CSN6254 HAK → SZX May 12, 03:00 UTCMay 12, 03:10 UTC10m
2026-05-11 CSN5795 SZX → URC May 11, 01:20 UTCMay 11, 01:30 UTC10m
2026-05-10 CSN5795 SZX → URC May 10, 01:20 UTCMay 10, 01:30 UTC10m
2026-05-09 CSN6481 SZX → HRB May 9, 04:25 UTCMay 9, 09:00 UTC4h 35m
2026-05-09 CSN6481 SZX → HRB May 9, 01:55 UTCMay 9, 02:15 UTC20m
2026-05-08 CSN5796 URC → SZX May 8, 12:49 UTCMay 8, 13:00 UTC10m
2026-05-08 CSN5795 SZX → URC May 8, 01:14 UTCMay 8, 01:24 UTC10m
2026-05-07 CSN8609 SZX → URC May 7, 03:55 UTCMay 7, 04:05 UTC10m
2026-05-06 CSN8609 SZX → URC May 6, 03:55 UTCMay 6, 04:15 UTC20m
2026-05-05 CSN3912 WUH → SZX May 5, 15:40 UTCMay 5, 16:00 UTC20m
2026-05-05 CSN3911 SZX → WUH May 5, 00:30 UTCMay 5, 00:45 UTC15m
2026-05-04 CSN3167 SZX → PKX May 4, 05:40 UTCMay 4, 05:55 UTC15m
2026-04-25 CSN6482 HRB → SZX Apr 25, 11:20 UTCApr 25, 11:30 UTC10m
2026-04-25 CSN6481 SZX → HRB Apr 25, 02:15 UTCApr 25, 02:25 UTC10m
2026-04-24 CSN8469 SZX → HAN Apr 24, 07:35 UTCApr 24, 08:00 UTC25m
2026-04-23 CSN3351 - Apr 23, 23:50 UTCApr 24, 00:00 UTC10m
2026-04-23 CSN8711 SZX → HGH Apr 23, 05:45 UTCApr 23, 06:01 UTC15m
2026-04-22 CSN5796 URC → SZX Apr 22, 12:55 UTCApr 22, 13:10 UTC15m
2026-04-22 CSN5795 SZX → URC Apr 22, 01:20 UTCApr 22, 01:30 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-30EZ page for operator, model, and routing details .

Mode-S 781939 frequently asked

What is Mode-S code 781939?
781939 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-30EZ.
Where is Mode-S 781939 registered?
Mode-S code 781939 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781939 broadcasting right now?
No active broadcast right now. Last signal was 8d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781939, octal 36014471, decimal 7,870,777.
What flights does 781939 operate?
Mode-S 781939 has broadcast 20 distinct callsigns, including CSN5795, CSN8609, CSN8469, CSN8158, CSN6481.