Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781F25

ICAO 24-bit transponder address · allocated to China

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

Hex
781F25
Octal
36017445
Decimal
7,872,293
Country
CN
Tail
B-32DG
Type
A21N
No current signal · last broadcast 3h ago
Flights observed
168
Distinct callsigns
20
Country
CN
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 781F25.

Country allocation

The ICAO 24-bit address 781F25 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
CSN8354 China Southern Airlines 21 2026-05-28
CSN8353 China Southern Airlines 16 2026-05-28
CSN8118 China Southern Airlines 15 2026-05-28
CSN8117 China Southern Airlines 12 2026-05-28
CSN5032 China Southern Airlines 9 2026-05-10
CSN5031 China Southern Airlines 8 2026-05-10
CSN5795 China Southern Airlines 7 2026-05-29
CSN6591 China Southern Airlines 3 2026-05-08
CSN5080 China Southern Airlines 3 2026-04-17
CSN5079 China Southern Airlines 3 2026-04-17
CSN3213 China Southern Airlines 3 2026-05-17
CSN3167 China Southern Airlines 3 2026-05-30
CSN8048 China Southern Airlines 2 2026-04-26
CSN8047 China Southern Airlines 2 2026-04-26
CSN6481 China Southern Airlines 2 2026-05-06
CSN3613 China Southern Airlines 2 2026-04-29
CSN3451 China Southern Airlines 2 2026-05-05
CSN3225 China Southern Airlines 2 2026-05-16
CSN3176 China Southern Airlines 2 2026-05-22
CSN3171 China Southern Airlines 2 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CSN3154 PEK → SZX May 30, 13:30 UTCMay 30, 13:40 UTC10m
2026-05-30 CSN3167 SZX → PKX May 30, 05:45 UTCMay 30, 05:55 UTC10m
2026-05-29 CSN5795 SZX → URC May 29, 01:40 UTCMay 29, 01:50 UTC10m
2026-05-28 CSN8354 CGK → SZX May 28, 22:10 UTCMay 28, 22:25 UTC15m
2026-05-28 CSN8354 CGK → SZX May 28, 17:40 UTCMay 28, 18:55 UTC1h 15m
2026-05-28 CSN8353 SZX → CGK May 28, 11:55 UTCMay 28, 12:05 UTC10m
2026-05-28 CSN8118 SIN → SZX May 28, 06:00 UTCMay 28, 06:25 UTC25m
2026-05-28 CSN8117 SZX → SIN May 28, 00:20 UTCMay 28, 00:30 UTC10m
2026-05-27 CSN3154 PEK → SZX May 27, 13:00 UTCMay 27, 13:15 UTC15m
2026-05-27 CSN3167 SZX → PKX May 27, 05:40 UTCMay 27, 05:49 UTC10m
2026-05-27 CSN6254 HAK → SZX May 27, 02:54 UTCMay 27, 03:14 UTC20m
2026-05-27 CSN6253 SZX → HAK May 27, 00:04 UTCMay 27, 00:25 UTC20m
2026-05-26 CSN5796 URC → SZX May 26, 12:24 UTCMay 26, 12:35 UTC10m
2026-05-26 CSN5795 SZX → URC May 26, 01:30 UTCMay 26, 01:44 UTC15m
2026-05-25 CSN3190 PEK → SZX May 25, 14:40 UTCMay 25, 15:00 UTC20m
2026-05-25 CSN3189 SZX → PEK May 25, 07:45 UTCMay 25, 08:00 UTC15m
2026-05-25 CSN3466 CKG → SZX May 25, 05:20 UTCMay 25, 05:30 UTC10m
2026-05-24 CSN5795 SZX → URC May 24, 01:20 UTCMay 24, 01:30 UTC10m
2026-05-23 CSN5795 SZX → URC May 23, 01:35 UTCMay 23, 01:45 UTC10m
2026-05-22 CSN6154 NGB → SZX May 22, 10:40 UTCMay 22, 15:50 UTC5h 10m
2026-05-22 CSN6153 SZX → NGB May 22, 09:50 UTCMay 22, 10:00 UTC10m
2026-05-22 CSN3176 PKX → SZX May 22, 07:40 UTCMay 22, 07:50 UTC10m
2026-05-22 CSN3176 PKX → SZX May 22, 04:40 UTCMay 22, 04:50 UTC10m
2026-05-21 CSN3171 SZX → PKX May 21, 23:55 UTCMay 22, 00:10 UTC15m
2026-05-21 CSN3797 SZX → HGH May 21, 07:40 UTCMay 21, 07:55 UTC15m
2026-05-17 CSN3213 SZX → XIY May 17, 00:15 UTCMay 17, 00:30 UTC15m
2026-05-16 CSN3225 SZX → XIY May 16, 08:46 UTCMay 16, 09:06 UTC20m
2026-05-15 CSN3171 SZX → PKX May 15, 23:50 UTCMay 16, 00:00 UTC10m
2026-05-15 CSN8576 HFE → SZX May 15, 17:00 UTCMay 15, 17:10 UTC10m
2026-05-15 CSN8575 SZX → HFE May 15, 11:30 UTCMay 15, 11:40 UTC10m
2026-05-15 CSN8118 SIN → SZX May 15, 05:40 UTCMay 15, 08:50 UTC3h 10m
2026-05-15 CSN8117 SZX → SIN May 15, 03:45 UTCMay 15, 03:55 UTC10m
2026-05-15 CSN8117 SZX → SIN May 15, 00:45 UTCMay 15, 01:00 UTC15m
2026-05-14 CSN8354 CGK → SZX May 14, 22:30 UTCMay 14, 22:45 UTC15m
2026-05-14 CSN8354 CGK → SZX May 14, 18:05 UTCMay 14, 19:40 UTC1h 35m
2026-05-14 CSN8353 SZX → CGK May 14, 12:10 UTCMay 14, 12:20 UTC10m
2026-05-14 CSN8118 SIN → SZX May 14, 09:05 UTCMay 14, 09:20 UTC15m
2026-05-14 CSN8118 SIN → SZX May 14, 05:45 UTCMay 14, 06:10 UTC25m
2026-05-14 CSN8117 SZX → SIN May 14, 00:40 UTCMay 14, 00:50 UTC10m
2026-05-13 CSN5387 SZX → NAO May 13, 08:20 UTCMay 13, 08:30 UTC10m
2026-05-13 CSN3213 SZX → XIY May 13, 00:15 UTCMay 13, 00:35 UTC20m
2026-05-12 - - May 12, 12:45 UTCMay 12, 12:55 UTC10m
2026-05-11 CSN8354 CGK → SZX May 11, 21:40 UTCMay 11, 21:50 UTC10m
2026-05-11 CSN8354 CGK → SZX May 11, 17:15 UTCMay 11, 18:40 UTC1h 25m
2026-05-11 CSN8353 SZX → CGK May 11, 15:20 UTCMay 11, 15:40 UTC20m
2026-05-11 CSN8353 SZX → CGK May 11, 11:15 UTCMay 11, 11:25 UTC10m
2026-05-11 CSN8118 SIN → SZX May 11, 09:10 UTCMay 11, 09:25 UTC15m
2026-05-11 CSN8118 SIN → SZX May 11, 05:55 UTCMay 11, 06:15 UTC20m
2026-05-11 CSN8117 SZX → SIN May 11, 03:05 UTCMay 11, 03:20 UTC15m
2026-05-10 - - May 10, 11:35 UTCMay 10, 11:50 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-32DG page for operator, model, and routing details .

Mode-S 781F25 frequently asked

What is Mode-S code 781F25?
781F25 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32DG.
Where is Mode-S 781F25 registered?
Mode-S code 781F25 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781F25 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781F25, octal 36017445, decimal 7,872,293.
What flights does 781F25 operate?
Mode-S 781F25 has broadcast 20 distinct callsigns, including CSN8354, CSN8353, CSN8118, CSN8117, CSN5032.