Apparatus

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sensors Mode-S transponder

781FB4

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32F1 · AIRBUS A-350-900

Hex
781FB4
Octal
36017664
Decimal
7,872,436
Country
CN
Tail
B-32F1
Type
A359
No current signal · last broadcast Jul 26, 14:15 UTC
Flights observed
186
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 14:15 UTC

Last known position

Most recent position reported by Mode-S 781FB4.

Country allocation

The ICAO 24-bit address 781FB4 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 34 2026-07-25
CSZ9508 Shenzhen Airlines 20 2026-07-25
CSZ9101 Shenzhen Airlines 20 2026-07-25
CSZ9507 Shenzhen Airlines 17 2026-07-26
CCA847 Air China 10 2026-05-06
CCA848 Air China 8 2026-05-07
CCA840 Air China 7 2026-04-23
CCA828 Air China 6 2026-05-10
CCA852 Air China 5 2026-05-16
CCA827 Air China 5 2026-05-09
CCA867 Air China 4 2026-04-26
CCA839 Air China 4 2026-04-22
CCA868 Air China 3 2026-04-28
CCA842 Air China 3 2026-05-01
CCA841 Air China 3 2026-04-30
CCA825 Air China 3 2026-05-09
CSZ9110 Shenzhen Airlines 2 2026-07-24
CSZ9109 Shenzhen Airlines 2 2026-07-24
CCA967 Air China 2 2026-05-11
CCA878 Air China 2 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSZ9507 SZX → SHA Jul 26, 11:00 UTCJul 26, 14:15 UTC3h 15m
2026-07-26 CSZ9507 SZX → SHA Jul 26, 09:40 UTCJul 26, 09:50 UTC10m
2026-07-25 CSZ9508 SHA → SZX Jul 25, 15:35 UTCJul 25, 15:45 UTC10m
2026-07-25 CSZ9507 SZX → SHA Jul 25, 10:35 UTCJul 25, 10:45 UTC10m
2026-07-25 CSZ9102 PEK → SZX Jul 25, 04:45 UTCJul 25, 05:30 UTC45m
2026-07-25 CSZ9101 SZX → PEK Jul 25, 01:50 UTCJul 25, 02:35 UTC45m
2026-07-24 CSZ9110 PEK → SZX Jul 24, 16:00 UTCJul 24, 16:10 UTC10m
2026-07-24 CSZ9110 PEK → SZX Jul 24, 13:20 UTCJul 24, 14:10 UTC50m
2026-07-24 CSZ9109 SZX → PEK Jul 24, 10:30 UTCJul 24, 11:05 UTC35m
2026-07-24 CSZ9109 SZX → PEK Jul 24, 08:45 UTCJul 24, 08:55 UTC10m
2026-07-24 CSZ9502 PVG → SZX Jul 24, 06:10 UTCJul 24, 06:30 UTC20m
2026-07-24 CSZ9501 SZX → SHA Jul 24, 00:45 UTCJul 24, 00:55 UTC10m
2026-07-23 CSZ9508 SHA → SZX Jul 23, 14:25 UTCJul 23, 15:10 UTC45m
2026-07-23 CSZ9102 PEK → SZX Jul 23, 07:00 UTCJul 23, 07:10 UTC10m
2026-07-23 CSZ9102 PEK → SZX Jul 23, 04:30 UTCJul 23, 04:50 UTC20m
2026-07-22 CSZ9101 - Jul 22, 23:55 UTCJul 23, 00:10 UTC15m
2026-07-22 CSZ9508 - Jul 22, 16:15 UTCJul 22, 17:00 UTC45m
2026-07-22 CSZ9102 PEK → SZX Jul 22, 04:45 UTCJul 22, 05:05 UTC20m
2026-07-22 CSZ9101 - Jul 22, 00:00 UTCJul 22, 00:10 UTC10m
2026-07-21 CSZ9508 - Jul 21, 18:00 UTCJul 21, 18:30 UTC30m
2026-07-21 CSZ9507 - Jul 21, 12:40 UTCJul 21, 12:50 UTC10m
2026-07-21 CSZ9102 - Jul 21, 10:00 UTCJul 21, 10:15 UTC15m
2026-07-21 CSZ9102 - Jul 21, 07:20 UTCJul 21, 07:40 UTC20m
2026-07-20 CSZ9101 - Jul 20, 23:50 UTCJul 21, 00:05 UTC15m
2026-07-20 CSZ9508 - Jul 20, 14:55 UTCJul 20, 15:45 UTC50m
2026-07-20 CSZ9507 - Jul 20, 10:05 UTCJul 20, 10:20 UTC15m
2026-07-20 CSZ9102 - Jul 20, 05:10 UTCJul 20, 05:30 UTC20m
2026-07-20 CSZ9101 - Jul 20, 00:45 UTCJul 20, 01:00 UTC15m
2026-07-19 CSZ9508 - Jul 19, 17:30 UTCJul 19, 17:40 UTC10m
2026-07-19 CSZ9102 - Jul 19, 07:35 UTCJul 19, 07:45 UTC10m
2026-07-19 CSZ9102 - Jul 19, 05:10 UTCJul 19, 05:20 UTC10m
2026-07-19 CSZ9101 - Jul 19, 02:20 UTCJul 19, 02:30 UTC10m
2026-07-18 CSZ9101 - Jul 18, 23:50 UTCJul 19, 00:00 UTC10m
2026-07-18 CSZ9508 - Jul 18, 17:00 UTCJul 18, 17:40 UTC40m
2026-07-18 CSZ9507 - Jul 18, 09:40 UTCJul 18, 09:50 UTC10m
2026-07-18 CSZ9102 - Jul 18, 07:50 UTCJul 18, 08:10 UTC20m
2026-07-18 CSZ9102 - Jul 18, 05:25 UTCJul 18, 05:35 UTC10m
2026-07-18 CSZ9101 - Jul 18, 02:25 UTCJul 18, 02:40 UTC15m
2026-07-17 CSZ9508 - Jul 17, 14:55 UTCJul 17, 15:05 UTC10m
2026-07-17 CSZ9507 - Jul 17, 09:30 UTCJul 17, 09:40 UTC10m
2026-07-17 CSZ9102 - Jul 17, 04:44 UTCJul 17, 04:59 UTC15m
2026-07-16 CSZ9101 - Jul 16, 23:49 UTCJul 16, 23:59 UTC10m
2026-07-16 CSZ9508 - Jul 16, 15:10 UTCJul 16, 15:49 UTC40m
2026-07-16 CSZ9507 - Jul 16, 10:45 UTCJul 16, 10:55 UTC10m
2026-07-16 CSZ9102 - Jul 16, 06:15 UTCJul 16, 06:35 UTC20m
2026-07-16 CSZ9101 - Jul 16, 00:10 UTCJul 16, 00:20 UTC10m
2026-07-15 CSZ9508 - Jul 15, 16:55 UTCJul 15, 17:35 UTC40m
2026-07-15 CSZ9507 - Jul 15, 11:45 UTCJul 15, 11:55 UTC10m
2026-07-15 CSZ9102 - Jul 15, 08:55 UTCJul 15, 09:10 UTC15m
2026-07-15 CSZ9102 - Jul 15, 04:40 UTCJul 15, 04:55 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-32F1 page for operator, model, and routing details .

Mode-S 781FB4 frequently asked

What is Mode-S code 781FB4?
781FB4 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32F1.
Where is Mode-S 781FB4 registered?
Mode-S code 781FB4 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781FB4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781FB4, octal 36017664, decimal 7,872,436.
What flights does 781FB4 operate?
Mode-S 781FB4 has broadcast 20 distinct callsigns, including CSZ9102, CSZ9508, CSZ9101, CSZ9507, CCA847.