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
Broadcasting now · callsign CSZ9106 · 30,950 ft
Flights observed
363
Distinct callsigns
20
Country
CN
Last broadcast
4h ago

Current position

781F39 is currently broadcasting. Map zoomed to live position.

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
CSZ9073 - 34 2026-07-13
CSZ9074 - 33 2026-07-13
CSZ9106 - 31 2026-07-11
CSZ9114 - 29 2026-07-14
CSZ9105 - 28 2026-07-14
CSZ9113 - 24 2026-07-04
CSZ9801 Shenzhen Airlines 18 2026-07-08
CSZ9802 - 16 2026-07-04
CSZ9505 - 11 2026-07-07
CSZ9110 - 11 2026-07-12
CSZ9506 - 9 2026-07-07
CSZ9109 - 8 2026-07-12
CSZ9209 - 7 2026-07-10
CSZ9514 - 6 2026-07-03
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
CSZ9513 - 4 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CSZ9105 - Jul 14, 04:45 UTCJul 14, 04:55 UTC10m
2026-07-14 CSZ9114 - Jul 14, 02:40 UTCJul 14, 02:55 UTC15m
2026-07-14 CSZ9114 - Jul 14, 00:05 UTCJul 14, 00:25 UTC20m
2026-07-13 CSZ9074 - Jul 13, 10:00 UTCJul 13, 11:20 UTC1h 20m
2026-07-13 CSZ9073 - Jul 13, 07:05 UTCJul 13, 08:25 UTC1h 20m
2026-07-12 CSZ9211 - Jul 12, 23:20 UTCJul 12, 23:30 UTC10m
2026-07-12 CSZ9110 - Jul 12, 15:40 UTCJul 12, 16:10 UTC30m
2026-07-12 CSZ9110 - Jul 12, 13:10 UTCJul 12, 13:35 UTC25m
2026-07-12 CSZ9109 - Jul 12, 08:30 UTCJul 12, 08:50 UTC20m
2026-07-12 CSZ9072 - Jul 12, 04:55 UTCJul 12, 06:15 UTC1h 20m
2026-07-12 CSZ9071 - Jul 12, 03:10 UTCJul 12, 03:40 UTC30m
2026-07-12 CSZ9071 - Jul 12, 02:20 UTCJul 12, 02:35 UTC15m
2026-07-11 CSZ9106 - Jul 11, 14:00 UTCJul 11, 14:20 UTC20m
2026-07-11 CSZ9106 - Jul 11, 11:25 UTCJul 11, 11:40 UTC15m
2026-07-11 CSZ9105 - Jul 11, 04:35 UTCJul 11, 04:50 UTC15m
2026-07-10 CSZ9209 - Jul 10, 14:15 UTCJul 10, 14:25 UTC10m
2026-07-10 CSZ9106 - Jul 10, 09:50 UTCJul 10, 10:05 UTC15m
2026-07-10 CSZ9105 - Jul 10, 04:55 UTCJul 10, 05:10 UTC15m
2026-07-10 CSZ9114 - Jul 10, 00:25 UTCJul 10, 00:45 UTC20m
2026-07-09 CSZ9074 - Jul 9, 10:55 UTCJul 9, 12:15 UTC1h 20m
2026-07-09 CSZ9073 - Jul 9, 08:00 UTCJul 9, 09:35 UTC1h 35m
2026-07-08 CSZ9801 SZX → PEK Jul 8, 23:55 UTCJul 9, 05:50 UTC5h 55m
2026-07-08 CSZ9074 - Jul 8, 11:35 UTCJul 8, 13:00 UTC1h 25m
2026-07-08 CSZ9073 - Jul 8, 08:40 UTCJul 8, 10:10 UTC1h 30m
2026-07-07 CSZ9801 SZX → PEK Jul 7, 23:45 UTCJul 8, 05:55 UTC6h 10m
2026-07-07 CSZ9506 - Jul 7, 16:20 UTCJul 7, 17:05 UTC45m
2026-07-07 CSZ9505 - Jul 7, 08:55 UTCJul 7, 09:05 UTC10m
2026-07-06 CSZ9467 - Jul 6, 13:15 UTCJul 6, 13:30 UTC15m
2026-07-06 CSZ9104 - Jul 6, 11:25 UTCJul 6, 11:40 UTC15m
2026-07-06 CSZ9103 - Jul 6, 02:35 UTCJul 6, 02:50 UTC15m
2026-07-05 CSZ9106 - Jul 5, 13:05 UTCJul 5, 13:25 UTC20m
2026-07-05 CSZ9106 - Jul 5, 10:15 UTCJul 5, 10:40 UTC25m
2026-07-05 CSZ9105 - Jul 5, 04:45 UTCJul 5, 04:55 UTC10m
2026-07-05 - - Jul 5, 02:45 UTCJul 5, 03:10 UTC25m
2026-07-05 CSZ9114 PEK → SZX Jul 5, 00:15 UTCJul 5, 00:35 UTC20m
2026-07-04 CSZ9113 - Jul 4, 17:30 UTCJul 4, 17:45 UTC15m
2026-07-04 CSZ9113 - Jul 4, 15:10 UTCJul 4, 15:20 UTC10m
2026-07-04 CSZ9074 - Jul 4, 12:30 UTCJul 4, 13:50 UTC1h 20m
2026-07-04 CSZ9073 - Jul 4, 09:55 UTCJul 4, 10:30 UTC35m
2026-07-04 CSZ9073 - Jul 4, 09:05 UTCJul 4, 09:20 UTC15m
2026-07-04 CSZ9802 - Jul 4, 05:40 UTCJul 4, 07:15 UTC1h 35m
2026-07-03 CSZ9801 SZX → PEK Jul 3, 23:35 UTCJul 3, 23:45 UTC10m
2026-07-03 CSZ9110 - Jul 3, 20:15 UTCJul 3, 20:30 UTC15m
2026-07-03 CSZ9110 - Jul 3, 17:45 UTCJul 3, 18:00 UTC15m
2026-07-03 CSZ9109 - Jul 3, 09:20 UTCJul 3, 09:35 UTC15m
2026-07-03 CSZ9514 - Jul 3, 06:25 UTCJul 3, 07:30 UTC1h 5m
2026-07-03 CSZ9513 - Jul 3, 00:50 UTCJul 3, 01:00 UTC10m
2026-07-02 CSZ9106 - Jul 2, 13:45 UTCJul 2, 14:20 UTC35m
2026-07-02 CSZ9106 - Jul 2, 10:40 UTCJul 2, 10:55 UTC15m
2026-07-02 CSZ9105 - Jul 2, 04:50 UTCJul 2, 05:00 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?
Yes. Mode-S 781F39 is currently airborne.
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 CSZ9073, CSZ9074, CSZ9106, CSZ9114, CSZ9105.