Apparatus

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sensors Mode-S transponder

781F3A

ICAO 24-bit transponder address · allocated to China

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

Hex
781F3A
Octal
36017472
Decimal
7,872,314
Country
CN
Tail
B-32DS
Type
A21N
No current signal · last broadcast 6h ago
Flights observed
167
Distinct callsigns
20
Country
CN
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 781F3A.

Country allocation

The ICAO 24-bit address 781F3A 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
CSZ9102 Shenzhen Airlines 30 2026-05-30
CSZ9101 Shenzhen Airlines 18 2026-05-29
CSZ9110 Shenzhen Airlines 16 2026-05-29
CSZ9812 Shenzhen Airlines 14 2026-05-27
CSZ9811 Shenzhen Airlines 11 2026-05-23
CSZ9109 Shenzhen Airlines 10 2026-05-29
CSZ9948 Shenzhen Airlines 5 2026-05-15
CSZ9947 Shenzhen Airlines 5 2026-05-15
CSZ9929 Shenzhen Airlines 5 2026-05-27
CSZ9502 Shenzhen Airlines 4 2026-05-29
CSZ9930 Shenzhen Airlines 3 2026-05-27
CSZ9920 Shenzhen Airlines 3 2026-04-19
CSZ9919 Shenzhen Airlines 3 2026-04-19
CSZ9501 Shenzhen Airlines 3 2026-05-29
CSZ9900 Shenzhen Airlines 2 2026-05-08
CSZ9899 Shenzhen Airlines 2 2026-05-08
CSZ9884 Shenzhen Airlines 2 2026-05-28
CSZ9883 Shenzhen Airlines 2 2026-05-28
CSZ9810 Shenzhen Airlines 2 2026-05-11
CSZ9809 Shenzhen Airlines 2 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CSZ9102 PEK → SZX May 30, 07:00 UTCMay 30, 07:20 UTC20m
2026-05-30 CSZ9102 PEK → SZX May 30, 04:45 UTCMay 30, 05:00 UTC15m
2026-05-29 CSZ9101 SZX → PEK May 29, 23:50 UTCMay 30, 00:00 UTC10m
2026-05-29 CSZ9110 PEK → SZX May 29, 15:05 UTCMay 29, 15:20 UTC15m
2026-05-29 CSZ9109 SZX → PEK May 29, 10:50 UTCMay 29, 11:00 UTC10m
2026-05-29 CSZ9109 SZX → PEK May 29, 08:20 UTCMay 29, 08:30 UTC10m
2026-05-29 CSZ9502 PVG → SZX May 29, 05:30 UTCMay 29, 06:15 UTC45m
2026-05-29 CSZ9501 SZX → SHA May 29, 00:10 UTCMay 29, 00:25 UTC15m
2026-05-28 CSZ9110 PEK → SZX May 28, 15:50 UTCMay 28, 16:15 UTC25m
2026-05-28 CSZ9110 PEK → SZX May 28, 13:20 UTCMay 28, 13:40 UTC20m
2026-05-28 CSZ9109 SZX → PEK May 28, 09:25 UTCMay 28, 09:45 UTC20m
2026-05-28 CSZ9884 HGH → SZX May 28, 06:05 UTCMay 28, 07:05 UTC1h 0m
2026-05-28 CSZ9883 SZX → SJW May 28, 01:55 UTCMay 28, 02:10 UTC15m
2026-05-27 CSZ9812 PVG → SZX May 27, 14:50 UTCMay 27, 15:10 UTC20m
2026-05-27 CSZ9930 TAO → SZX May 27, 07:35 UTCMay 27, 07:45 UTC10m
2026-05-27 CSZ9929 SZX → TAO May 27, 01:29 UTCMay 27, 01:39 UTC10m
2026-05-26 CSZ9110 PEK → SZX May 26, 16:00 UTCMay 26, 16:15 UTC15m
2026-05-26 CSZ9110 PEK → SZX May 26, 13:19 UTCMay 26, 13:45 UTC25m
2026-05-26 CSZ9109 SZX → PEK May 26, 08:24 UTCMay 26, 08:39 UTC15m
2026-05-26 CSZ9403 SZX → CTU May 26, 00:44 UTCMay 26, 01:00 UTC15m
2026-05-25 CSZ9074 TPE → SZX May 25, 09:50 UTCMay 25, 11:10 UTC1h 20m
2026-05-25 CSZ9073 SZX → TPE May 25, 06:55 UTCMay 25, 08:25 UTC1h 30m
2026-05-24 CSZ9209 SZX → XIY May 24, 13:20 UTCMay 24, 13:40 UTC20m
2026-05-24 CSZ9074 TPE → SZX May 24, 10:45 UTCMay 24, 12:10 UTC1h 25m
2026-05-24 CSZ9073 SZX → TPE May 24, 07:40 UTCMay 24, 09:15 UTC1h 35m
2026-05-24 CSZ9802 PEK → SZX May 24, 05:20 UTCMay 24, 06:15 UTC55m
2026-05-23 CSZ9801 SZX → PEK May 23, 23:50 UTCMay 24, 00:00 UTC10m
2026-05-23 CSZ9811 SZX → PVG May 23, 11:10 UTCMay 23, 11:45 UTC35m
2026-05-23 CSZ9102 PEK → SZX May 23, 07:35 UTCMay 23, 07:45 UTC10m
2026-05-22 CSZ9101 SZX → PEK May 22, 23:45 UTCMay 23, 00:00 UTC15m
2026-05-22 CSZ9110 PEK → SZX May 22, 15:40 UTCMay 22, 16:05 UTC25m
2026-05-22 CSZ9109 SZX → PEK May 22, 08:35 UTCMay 22, 08:45 UTC10m
2026-05-22 CSZ9502 PVG → SZX May 22, 00:20 UTCMay 22, 07:15 UTC6h 55m
2026-05-21 CSZ9106 PEK → SZX May 21, 16:10 UTCMay 21, 16:30 UTC20m
2026-05-21 CSZ9106 PEK → SZX May 21, 13:15 UTCMay 21, 13:25 UTC10m
2026-05-21 CSZ9105 SZX → PEK May 21, 08:15 UTCMay 21, 08:25 UTC10m
2026-05-21 CSZ9105 SZX → PEK May 21, 05:45 UTCMay 21, 06:00 UTC15m
2026-05-20 CSZ9812 PVG → SZX May 20, 22:55 UTCMay 20, 23:10 UTC15m
2026-05-20 CSZ9811 SZX → PVG May 20, 10:45 UTCMay 20, 10:55 UTC10m
2026-05-20 CSZ9102 PEK → SZX May 20, 07:25 UTCMay 20, 07:35 UTC10m
2026-05-20 CSZ9102 PEK → SZX May 20, 04:40 UTCMay 20, 05:00 UTC20m
2026-05-20 CSZ9101 SZX → PEK May 20, 00:10 UTCMay 20, 00:25 UTC15m
2026-05-19 CSZ9812 PVG → SZX May 19, 15:20 UTCMay 19, 16:05 UTC45m
2026-05-19 CSZ9811 SZX → PVG May 19, 10:25 UTCMay 19, 10:35 UTC10m
2026-05-19 CSZ9102 PEK → SZX May 19, 07:15 UTCMay 19, 07:30 UTC15m
2026-05-19 CSZ9102 PEK → SZX May 19, 04:35 UTCMay 19, 04:55 UTC20m
2026-05-18 CSZ9101 SZX → PEK May 18, 23:45 UTCMay 19, 00:00 UTC15m
2026-05-18 CSZ9110 PEK → SZX May 18, 16:05 UTCMay 18, 16:25 UTC20m
2026-05-18 CSZ9110 PEK → SZX May 18, 13:15 UTCMay 18, 13:40 UTC25m
2026-05-18 CSZ9502 PVG → SZX May 18, 05:45 UTCMay 18, 06:01 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-32DS page for operator, model, and routing details .

Mode-S 781F3A frequently asked

What is Mode-S code 781F3A?
781F3A is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32DS.
Where is Mode-S 781F3A registered?
Mode-S code 781F3A is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781F3A broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781F3A, octal 36017472, decimal 7,872,314.
What flights does 781F3A operate?
Mode-S 781F3A has broadcast 20 distinct callsigns, including CSZ9102, CSZ9101, CSZ9110, CSZ9812, CSZ9811.