Apparatus

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sensors Mode-S transponder

781431

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1146 · BOEING 737 MAX 8

Hex
781431
Octal
36012061
Decimal
7,869,489
Country
CN
Tail
B-1146
Type
B38M
No current signal · last broadcast Jul 25, 09:45 UTC
Flights observed
245
Distinct callsigns
20
Country
CN
Last broadcast
Jul 25, 09:45 UTC

Last known position

Most recent position reported by Mode-S 781431.

Country allocation

The ICAO 24-bit address 781431 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
CSZ9637 Shenzhen Airlines 13 2026-07-19
CSZ9604 - 11 2026-07-14
CSZ9137 - 11 2026-07-14
CSZ9912 Shenzhen Airlines 10 2026-06-10
CSZ9138 - 10 2026-07-03
CSZ9922 Shenzhen Airlines 9 2026-07-03
CSZ9918 - 9 2026-07-04
CSZ9916 - 8 2026-06-30
CSZ9638 Shenzhen Airlines 8 2026-07-19
CSZ9146 - 7 2026-06-30
CSZ9145 - 6 2026-06-30
CSZ9917 - 5 2026-07-04
CSZ9915 - 5 2026-06-30
CSZ9852 Shenzhen Airlines 5 2026-07-24
CSZ9603 - 5 2026-07-14
CSZ9231 - 4 2026-07-18
CSZ9921 Shenzhen Airlines 3 2026-05-27
CSZ9920 Shenzhen Airlines 3 2026-06-04
CSZ9919 Shenzhen Airlines 3 2026-06-04
CSZ9855 - 3 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CSZ8106 BAV → SZX Jul 25, 08:40 UTCJul 25, 09:45 UTC1h 5m
2026-07-25 CSZ8105 SZX → BAV Jul 25, 01:00 UTCJul 25, 05:55 UTC4h 55m
2026-07-24 CSZ8105 SZX → BAV Jul 24, 23:10 UTCJul 24, 23:20 UTC10m
2026-07-24 CSZ9852 PEK → SZX Jul 24, 15:30 UTCJul 24, 16:30 UTC1h 0m
2026-07-19 CSZ9853 SZX → NKG Jul 19, 12:05 UTCJul 19, 12:15 UTC10m
2026-07-19 CSZ9638 CGQ → SZX Jul 19, 02:30 UTCJul 19, 09:50 UTC7h 20m
2026-07-19 CSZ9637 SZX → CGQ Jul 19, 00:15 UTCJul 19, 00:25 UTC10m
2026-07-18 CSZ9208 XIY → SZX Jul 18, 16:35 UTCJul 18, 16:45 UTC10m
2026-07-18 CSZ9207 SZX → XIY Jul 18, 10:20 UTCJul 18, 10:30 UTC10m
2026-07-18 CSZ9231 - Jul 18, 01:39 UTCJul 18, 01:50 UTC10m
2026-07-17 CSZ9852 - Jul 17, 15:15 UTCJul 17, 16:00 UTC45m
2026-07-15 CSZ9466 - Jul 15, 15:25 UTCJul 15, 15:45 UTC20m
2026-07-15 CSZ9465 - Jul 15, 09:35 UTCJul 15, 09:50 UTC15m
2026-07-15 - - Jul 15, 07:25 UTCJul 15, 07:55 UTC30m
2026-07-14 CSZ9137 - Jul 14, 23:45 UTCJul 14, 23:55 UTC10m
2026-07-14 CSZ9604 - Jul 14, 18:25 UTCJul 14, 18:50 UTC25m
2026-07-14 CSZ9604 - Jul 14, 15:55 UTCJul 14, 16:15 UTC20m
2026-07-14 CSZ9603 - Jul 14, 10:15 UTCJul 14, 10:25 UTC10m
2026-07-14 CSZ9232 - Jul 14, 07:50 UTCJul 14, 08:00 UTC10m
2026-07-13 CSZ8968 - Jul 13, 14:05 UTCJul 13, 14:30 UTC25m
2026-07-13 CSZ8106 - Jul 13, 08:10 UTCJul 13, 08:20 UTC10m
2026-07-13 CSZ8106 - Jul 13, 01:25 UTCJul 13, 05:55 UTC4h 30m
2026-07-12 CSZ8105 - Jul 12, 23:05 UTCJul 12, 23:15 UTC10m
2026-07-12 CSZ9130 - Jul 12, 10:30 UTCJul 12, 10:45 UTC15m
2026-07-12 CSZ9129 - Jul 12, 03:30 UTCJul 12, 03:40 UTC10m
2026-07-11 CSZ9852 - Jul 11, 14:50 UTCJul 11, 15:00 UTC10m
2026-07-07 CSZ9855 - Jul 7, 16:10 UTCJul 7, 16:20 UTC10m
2026-07-07 CSZ9129 - Jul 7, 06:15 UTCJul 7, 06:25 UTC10m
2026-07-06 CSZ9127 - Jul 6, 10:00 UTCJul 6, 10:10 UTC10m
2026-07-06 CSZ9231 - Jul 6, 00:40 UTCJul 6, 00:55 UTC15m
2026-07-05 CSZ9638 - Jul 5, 12:30 UTCJul 5, 12:55 UTC25m
2026-07-05 CSZ9638 - Jul 5, 04:50 UTCJul 5, 10:05 UTC5h 15m
2026-07-05 CSZ9637 - Jul 5, 02:30 UTCJul 5, 02:40 UTC10m
2026-07-04 CSZ8928 - Jul 4, 21:00 UTCJul 4, 21:20 UTC20m
2026-07-04 CSZ8927 - Jul 4, 11:30 UTCJul 4, 11:40 UTC10m
2026-07-04 CSZ9918 - Jul 4, 09:15 UTCJul 4, 09:30 UTC15m
2026-07-04 CSZ9917 - Jul 4, 02:30 UTCJul 4, 02:40 UTC10m
2026-07-03 CSZ9922 NTG → SZX Jul 3, 14:35 UTCJul 3, 14:45 UTC10m
2026-07-03 CSZ9138 - Jul 3, 06:10 UTCJul 3, 06:25 UTC15m
2026-07-02 CSZ9137 SZX → SJW Jul 2, 23:20 UTCJul 2, 23:30 UTC10m
2026-07-02 CSZ8928 - Jul 2, 18:15 UTCJul 2, 18:35 UTC20m
2026-07-02 CSZ8927 - Jul 2, 12:35 UTCJul 2, 12:45 UTC10m
2026-07-02 CSZ9918 - Jul 2, 09:55 UTCJul 2, 10:15 UTC20m
2026-07-02 CSZ9917 - Jul 2, 02:20 UTCJul 2, 02:30 UTC10m
2026-07-01 CSZ9231 - Jul 1, 00:40 UTCJul 1, 00:50 UTC10m
2026-06-30 CSZ9146 - Jun 30, 16:30 UTCJun 30, 16:45 UTC15m
2026-06-30 CSZ9145 - Jun 30, 09:50 UTCJun 30, 10:00 UTC10m
2026-06-30 CSZ9916 - Jun 30, 07:10 UTCJun 30, 07:20 UTC10m
2026-06-30 CSZ9915 - Jun 30, 00:04 UTCJun 30, 00:14 UTC10m
2026-06-29 CSZ8928 - Jun 29, 16:39 UTCJun 29, 17:05 UTC25m

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-1146 page for operator, model, and routing details .

Mode-S 781431 frequently asked

What is Mode-S code 781431?
781431 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1146.
Where is Mode-S 781431 registered?
Mode-S code 781431 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781431 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 09:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781431, octal 36012061, decimal 7,869,489.
What flights does 781431 operate?
Mode-S 781431 has broadcast 20 distinct callsigns, including CSZ9637, CSZ9604, CSZ9137, CSZ9912, CSZ9138.