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 Jul 26, 19:55 UTC
Flights observed
399
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 19:55 UTC

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 - 45 2026-07-20
CSN8353 - 38 2026-07-20
CSN8118 China Southern Airlines 32 2026-07-21
CSN8117 China Southern Airlines 28 2026-07-21
CSN5031 China Southern Airlines 18 2026-07-25
CSN5032 China Southern Airlines 17 2026-07-25
CSN5795 China Southern Airlines 8 2026-06-04
CSN6481 - 6 2026-07-07
CSN8048 China Southern Airlines 5 2026-06-16
CSN8047 - 4 2026-06-16
CSN6591 China Southern Airlines 4 2026-06-12
CSN3613 - 4 2026-07-08
CSN3451 - 4 2026-06-25
CSN3167 China Southern Airlines 4 2026-06-14
CSN6592 - 3 2026-06-29
CSN6386 - 3 2026-07-11
CSN5080 China Southern Airlines 3 2026-04-17
CSN5079 China Southern Airlines 3 2026-04-17
CSN3576 - 3 2026-07-19
CSN3568 - 3 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN5085 SZX → SIN Jul 26, 19:15 UTCJul 26, 19:55 UTC40m
2026-07-26 CSN5388 NAO → SZX Jul 26, 14:05 UTCJul 26, 14:15 UTC10m
2026-07-26 CSN5387 SZX → NAO Jul 26, 08:40 UTCJul 26, 08:50 UTC10m
2026-07-26 CSN3192 PEK → SZX Jul 26, 06:35 UTCJul 26, 07:10 UTC35m
2026-07-25 CSN3155 SZX → PEK Jul 25, 14:50 UTCJul 25, 15:00 UTC10m
2026-07-25 CSN5032 KUL → SZX Jul 25, 12:40 UTCJul 25, 12:50 UTC10m
2026-07-25 CSN5032 KUL → SZX Jul 25, 08:10 UTCJul 25, 08:20 UTC10m
2026-07-25 CSN5031 SZX → KUL Jul 25, 06:00 UTCJul 25, 06:25 UTC25m
2026-07-25 CSN5031 SZX → KUL Jul 25, 03:00 UTCJul 25, 03:10 UTC10m
2026-07-25 CSN8588 - Jul 25, 01:00 UTCJul 25, 01:15 UTC15m
2026-07-24 CSN8591 SZX → HGH Jul 24, 00:40 UTCJul 24, 00:55 UTC15m
2026-07-23 CSN6970 NAO → SZX Jul 23, 15:25 UTCJul 23, 15:35 UTC10m
2026-07-23 CSN6969 SZX → NAO Jul 23, 10:25 UTCJul 23, 10:40 UTC15m
2026-07-23 CSN8758 HAK → PVG Jul 23, 08:45 UTCJul 23, 09:10 UTC25m
2026-07-23 CSN8757 PVG → HAK Jul 23, 01:05 UTCJul 23, 01:15 UTC10m
2026-07-22 CSN8158 BKK → SZX Jul 22, 22:40 UTCJul 22, 22:55 UTC15m
2026-07-22 CSN8158 BKK → SZX Jul 22, 20:35 UTCJul 22, 21:05 UTC30m
2026-07-22 CSN8157 SZX → BKK Jul 22, 16:40 UTCJul 22, 18:10 UTC1h 30m
2026-07-22 CSN8157 SZX → BKK Jul 22, 16:00 UTCJul 22, 16:10 UTC10m
2026-07-22 CSN5388 NAO → SZX Jul 22, 14:10 UTCJul 22, 14:20 UTC10m
2026-07-22 CSN6969 SZX → NAO Jul 22, 01:00 UTCJul 22, 01:15 UTC15m
2026-07-21 - - Jul 21, 08:55 UTCJul 21, 09:10 UTC15m
2026-07-21 CSN8118 SIN → SZX Jul 21, 05:35 UTCJul 21, 05:55 UTC20m
2026-07-21 CSN8117 SZX → SIN Jul 21, 03:15 UTCJul 21, 03:40 UTC25m
2026-07-21 CSN8117 SZX → SIN Jul 21, 00:25 UTCJul 21, 00:35 UTC10m
2026-07-20 CSN8354 - Jul 20, 21:55 UTCJul 20, 22:10 UTC15m
2026-07-20 CSN8354 - Jul 20, 17:30 UTCJul 20, 19:00 UTC1h 30m
2026-07-20 CSN8353 - Jul 20, 15:40 UTCJul 20, 15:55 UTC15m
2026-07-20 CSN8353 - Jul 20, 11:30 UTCJul 20, 11:40 UTC10m
2026-07-20 CSN3090 ICN → SZX Jul 20, 09:50 UTCJul 20, 10:00 UTC10m
2026-07-20 CSN3090 ICN → SZX Jul 20, 07:00 UTCJul 20, 07:40 UTC40m
2026-07-20 CSN3089 SZX → ICN Jul 20, 04:55 UTCJul 20, 05:35 UTC40m
2026-07-20 CSN3089 SZX → ICN Jul 20, 02:30 UTCJul 20, 02:40 UTC10m
2026-07-19 CSN8324 - Jul 19, 12:45 UTCJul 19, 13:05 UTC20m
2026-07-19 CSN8324 - Jul 19, 10:35 UTCJul 19, 10:50 UTC15m
2026-07-19 CSN8323 - Jul 19, 08:05 UTCJul 19, 08:15 UTC10m
2026-07-19 CSN8323 - Jul 19, 06:05 UTCJul 19, 06:20 UTC15m
2026-07-19 CSN3576 - Jul 19, 00:10 UTCJul 19, 04:10 UTC4h 0m
2026-07-18 CSN3568 - Jul 18, 22:50 UTCJul 18, 23:00 UTC10m
2026-07-18 CSN3912 WUH → SZX Jul 18, 15:30 UTCJul 18, 15:40 UTC10m
2026-07-18 CSN3911 - Jul 18, 00:35 UTCJul 18, 00:45 UTC10m
2026-07-17 CSN3174 - Jul 17, 13:35 UTCJul 17, 13:50 UTC15m
2026-07-17 CSN3570 - Jul 17, 04:39 UTCJul 17, 05:25 UTC45m
2026-07-17 CSN3569 - Jul 17, 00:20 UTCJul 17, 00:30 UTC10m
2026-07-16 CSN3236 - Jul 16, 16:40 UTCJul 16, 17:25 UTC45m
2026-07-16 CSN3235 - Jul 16, 13:10 UTCJul 16, 14:10 UTC1h 0m
2026-07-16 CSN3552 - Jul 16, 11:15 UTCJul 16, 11:25 UTC10m
2026-07-16 CSN3551 - Jul 16, 04:45 UTCJul 16, 04:55 UTC10m
2026-07-16 CSN6444 - Jul 16, 02:50 UTCJul 16, 03:00 UTC10m
2026-07-11 CSN5120 - Jul 11, 11:25 UTCJul 11, 11:40 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 Jul 26, 19:55 UTC.
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, CSN5031.