Apparatus

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sensors Mode-S transponder

781F39

ICAO 24-bit transponder address · allocated to China

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

Hex
781F39
Octal
36017471
Decimal
7,872,313
Country
CN
Tail
B-32DT
Type
A21N
No current signal · last broadcast Jul 25, 13:00 UTC
Flights observed
418
Distinct callsigns
20
Country
CN
Last broadcast
Jul 25, 13:00 UTC

Last known position

Most recent position reported by Mode-S 781F39.

Country allocation

The ICAO 24-bit address 781F39 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
CSZ9106 Shenzhen Airlines 37 2026-07-23
CSZ9074 Shenzhen Airlines 37 2026-07-24
CSZ9073 Shenzhen Airlines 37 2026-07-24
CSZ9114 Shenzhen Airlines 32 2026-07-23
CSZ9105 Shenzhen Airlines 31 2026-07-23
CSZ9113 Shenzhen Airlines 27 2026-07-22
CSZ9801 Shenzhen Airlines 20 2026-07-21
CSZ9802 Shenzhen Airlines 18 2026-07-22
CSZ9110 - 15 2026-07-16
CSZ9505 - 12 2026-07-18
CSZ9209 Shenzhen Airlines 11 2026-07-25
CSZ9109 - 11 2026-07-16
CSZ9506 - 10 2026-07-18
CSZ9514 - 7 2026-07-16
CSZ9513 - 5 2026-07-16
CSZ9512 Shenzhen Airlines 5 2026-06-02
CSZ9511 Shenzhen Airlines 5 2026-06-01
CSZ9102 - 5 2026-06-23
CSZ9948 Shenzhen Airlines 4 2026-05-19
CSZ9529 - 4 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CSZ9209 SZX → XIY Jul 25, 12:50 UTCJul 25, 13:00 UTC10m
2026-07-25 CSZ9202 XIY → SZX Jul 25, 11:00 UTCJul 25, 11:35 UTC35m
2026-07-25 CSZ9210 XIY → SZX Jul 25, 03:00 UTCJul 25, 03:10 UTC10m
2026-07-24 CSZ9209 SZX → XIY Jul 24, 12:50 UTCJul 24, 13:00 UTC10m
2026-07-24 CSZ9074 TPE → SZX Jul 24, 09:50 UTCJul 24, 11:05 UTC1h 15m
2026-07-24 CSZ9073 SZX → TPE Jul 24, 06:55 UTCJul 24, 08:20 UTC1h 25m
2026-07-23 CSZ9211 SZX → XIY Jul 23, 23:20 UTCJul 23, 23:30 UTC10m
2026-07-23 CSZ9313 SZX → HAK Jul 23, 14:30 UTCJul 23, 14:45 UTC15m
2026-07-23 CSZ9106 PEK → SZX Jul 23, 12:50 UTCJul 23, 13:20 UTC30m
2026-07-23 CSZ9106 PEK → SZX Jul 23, 10:20 UTCJul 23, 10:40 UTC20m
2026-07-23 CSZ9105 SZX → PEK Jul 23, 04:45 UTCJul 23, 05:05 UTC20m
2026-07-23 CSZ9114 PEK → SZX Jul 23, 00:10 UTCJul 23, 00:30 UTC20m
2026-07-22 CSZ9113 SZX → PEK Jul 22, 15:25 UTCJul 22, 15:40 UTC15m
2026-07-22 CSZ9074 TPE → SZX Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 CSZ9802 PEK → SZX Jul 22, 04:15 UTCJul 22, 04:55 UTC40m
2026-07-21 CSZ9801 SZX → PEK Jul 21, 23:40 UTCJul 21, 23:50 UTC10m
2026-07-21 CSZ9950 CGO → SZX Jul 21, 18:55 UTCJul 21, 19:20 UTC25m
2026-07-21 CSZ9949 SZX → CGO Jul 21, 13:05 UTCJul 21, 13:20 UTC15m
2026-07-21 CSZ9201 SZX → XIY Jul 21, 05:15 UTCJul 21, 05:35 UTC20m
2026-07-21 CSZ9114 PEK → SZX Jul 21, 03:20 UTCJul 21, 03:30 UTC10m
2026-07-21 CSZ9114 PEK → SZX Jul 21, 00:10 UTCJul 21, 00:30 UTC20m
2026-07-20 CSZ9113 - Jul 20, 16:40 UTCJul 20, 17:00 UTC20m
2026-07-20 CSZ9113 - Jul 20, 14:00 UTCJul 20, 14:15 UTC15m
2026-07-20 CSZ9074 TPE → SZX Jul 20, 09:40 UTCJul 20, 11:00 UTC1h 20m
2026-07-20 CSZ9073 SZX → TPE Jul 20, 06:40 UTCJul 20, 08:15 UTC1h 35m
2026-07-20 CSZ9882 HGH → SZX Jul 20, 04:20 UTCJul 20, 04:30 UTC10m
2026-07-19 CSZ9881 SZX → HGH Jul 19, 23:35 UTCJul 19, 23:50 UTC15m
2026-07-19 CSZ9318 CGO → SZX Jul 19, 17:55 UTCJul 19, 18:05 UTC10m
2026-07-19 CSZ9313 SZX → HAK Jul 19, 14:00 UTCJul 19, 14:10 UTC10m
2026-07-19 CSZ9106 - Jul 19, 12:00 UTCJul 19, 12:20 UTC20m
2026-07-19 CSZ9106 - Jul 19, 09:35 UTCJul 19, 09:50 UTC15m
2026-07-19 CSZ9105 SZX → PEK Jul 19, 07:20 UTCJul 19, 07:35 UTC15m
2026-07-19 CSZ9105 SZX → PEK Jul 19, 04:50 UTCJul 19, 05:00 UTC10m
2026-07-18 CSZ9209 - Jul 18, 13:05 UTCJul 18, 13:15 UTC10m
2026-07-18 CSZ9506 - Jul 18, 09:50 UTCJul 18, 10:35 UTC45m
2026-07-18 CSZ9505 - Jul 18, 05:25 UTCJul 18, 05:35 UTC10m
2026-07-17 CSZ9209 - Jul 17, 12:55 UTCJul 17, 13:10 UTC15m
2026-07-17 CSZ9074 - Jul 17, 09:55 UTCJul 17, 11:15 UTC1h 20m
2026-07-17 CSZ9073 - Jul 17, 07:05 UTCJul 17, 08:35 UTC1h 30m
2026-07-17 CSZ9802 - Jul 17, 05:04 UTCJul 17, 05:25 UTC20m
2026-07-16 CSZ9801 - Jul 16, 23:29 UTCJul 16, 23:40 UTC10m
2026-07-16 CSZ9110 - Jul 16, 16:40 UTCJul 16, 17:00 UTC20m
2026-07-16 CSZ9110 - Jul 16, 14:00 UTCJul 16, 14:20 UTC20m
2026-07-16 CSZ9109 - Jul 16, 08:35 UTCJul 16, 08:50 UTC15m
2026-07-16 CSZ9514 - Jul 16, 06:05 UTCJul 16, 07:00 UTC55m
2026-07-16 CSZ9513 - Jul 16, 00:40 UTCJul 16, 00:50 UTC10m
2026-07-15 CSZ9110 - Jul 15, 17:45 UTCJul 15, 17:55 UTC10m
2026-07-15 CSZ9110 - Jul 15, 15:10 UTCJul 15, 15:30 UTC20m
2026-07-15 CSZ9109 - Jul 15, 12:30 UTCJul 15, 12:40 UTC10m
2026-07-15 CSZ9109 - Jul 15, 10:00 UTCJul 15, 10:10 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-32DT page for operator, model, and routing details .

Mode-S 781F39 frequently asked

What is Mode-S code 781F39?
781F39 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32DT.
Where is Mode-S 781F39 registered?
Mode-S code 781F39 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781F39 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 13:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781F39, octal 36017471, decimal 7,872,313.
What flights does 781F39 operate?
Mode-S 781F39 has broadcast 20 distinct callsigns, including CSZ9106, CSZ9074, CSZ9073, CSZ9114, CSZ9105.