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 3h ago
Flights observed
133
Distinct callsigns
20
Country
CN
Last broadcast
3h ago

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 - 19 2026-07-14
CCA847 Air China 10 2026-05-06
CSZ9508 - 9 2026-07-13
CSZ9101 - 9 2026-07-12
CCA848 Air China 8 2026-05-07
CSZ9507 - 7 2026-07-13
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
CCA967 Air China 2 2026-05-11
CCA878 Air China 2 2026-05-18
CCA877 Air China 2 2026-05-16
CCA875 Air China 2 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CSZ9102 - Jul 14, 07:10 UTCJul 14, 07:25 UTC15m
2026-07-14 CSZ9102 - Jul 14, 04:30 UTCJul 14, 04:50 UTC20m
2026-07-13 CSZ9508 - Jul 13, 14:35 UTCJul 13, 14:55 UTC20m
2026-07-13 CSZ9507 - Jul 13, 09:20 UTCJul 13, 09:30 UTC10m
2026-07-13 CSZ9102 - Jul 13, 07:01 UTCJul 13, 07:15 UTC15m
2026-07-13 CSZ9102 - Jul 13, 04:25 UTCJul 13, 04:50 UTC25m
2026-07-12 CSZ9101 - Jul 12, 23:50 UTCJul 13, 00:01 UTC10m
2026-07-12 CSZ9508 - Jul 12, 14:25 UTCJul 12, 15:10 UTC45m
2026-07-12 CSZ9507 - Jul 12, 09:25 UTCJul 12, 09:40 UTC15m
2026-07-12 CSZ9102 - Jul 12, 04:30 UTCJul 12, 04:55 UTC25m
2026-07-11 CSZ9101 - Jul 11, 00:00 UTCJul 11, 00:10 UTC10m
2026-07-10 CSZ9508 - Jul 10, 14:20 UTCJul 10, 15:00 UTC40m
2026-07-10 CSZ9102 - Jul 10, 07:05 UTCJul 10, 07:20 UTC15m
2026-07-10 CSZ9102 - Jul 10, 04:45 UTCJul 10, 05:05 UTC20m
2026-07-10 CSZ9101 - Jul 10, 00:10 UTCJul 10, 00:20 UTC10m
2026-07-09 CSZ9508 - Jul 9, 15:45 UTCJul 9, 16:05 UTC20m
2026-07-09 CSZ9507 - Jul 9, 09:50 UTCJul 9, 10:05 UTC15m
2026-07-09 CSZ9102 - Jul 9, 08:00 UTCJul 9, 08:10 UTC10m
2026-07-09 CSZ9102 - Jul 9, 05:35 UTCJul 9, 05:45 UTC10m
2026-07-09 CSZ9101 - Jul 9, 00:05 UTCJul 9, 00:15 UTC10m
2026-07-08 CSZ9508 - Jul 8, 17:30 UTCJul 8, 18:10 UTC40m
2026-07-08 CSZ9102 - Jul 8, 07:40 UTCJul 8, 07:55 UTC15m
2026-07-07 CSZ9101 SZX → PEK Jul 7, 23:55 UTCJul 8, 00:05 UTC10m
2026-07-07 CSZ9102 - Jul 7, 11:00 UTCJul 7, 11:10 UTC10m
2026-07-07 CSZ9102 - Jul 7, 07:30 UTCJul 7, 07:40 UTC10m
2026-07-06 CSZ9508 - Jul 6, 18:40 UTCJul 6, 19:15 UTC35m
2026-07-06 CSZ9507 - Jul 6, 11:25 UTCJul 6, 11:35 UTC10m
2026-07-06 CSZ9102 - Jul 6, 07:45 UTCJul 6, 08:05 UTC20m
2026-07-06 CSZ9102 - Jul 6, 05:00 UTCJul 6, 05:20 UTC20m
2026-07-06 CSZ9101 SZX → PEK Jul 6, 00:05 UTCJul 6, 00:15 UTC10m
2026-07-05 CSZ9508 - Jul 5, 16:30 UTCJul 5, 16:40 UTC10m
2026-07-05 CSZ9507 - Jul 5, 10:40 UTCJul 5, 10:50 UTC10m
2026-07-05 CSZ9102 - Jul 5, 08:30 UTCJul 5, 08:45 UTC15m
2026-07-05 CSZ9102 - Jul 5, 05:50 UTCJul 5, 06:15 UTC25m
2026-07-05 CSZ9101 SZX → PEK Jul 5, 01:25 UTCJul 5, 01:35 UTC10m
2026-07-04 CSZ9508 - Jul 4, 18:20 UTCJul 4, 18:40 UTC20m
2026-07-04 CSZ9507 - Jul 4, 10:25 UTCJul 4, 10:35 UTC10m
2026-07-04 CSZ9102 - Jul 4, 08:20 UTCJul 4, 08:35 UTC15m
2026-07-04 CSZ9102 - Jul 4, 05:00 UTCJul 4, 05:20 UTC20m
2026-07-04 CSZ9101 SZX → PEK Jul 4, 00:30 UTCJul 4, 00:40 UTC10m
2026-07-03 CSZ9508 - Jul 3, 19:00 UTCJul 3, 19:15 UTC15m
2026-07-03 CSZ9507 - Jul 3, 11:35 UTCJul 3, 12:35 UTC1h 0m
2026-07-03 CSZ9102 - Jul 3, 05:20 UTCJul 3, 05:40 UTC20m
2026-07-02 CSZ9101 SZX → PEK Jul 2, 23:55 UTCJul 3, 00:05 UTC10m
2026-07-02 CSZ9108 - Jul 2, 11:35 UTCJul 2, 11:45 UTC10m
2026-07-02 CSZ9107 - Jul 2, 06:41 UTCJul 2, 06:51 UTC10m
2026-07-02 CSZ9882 - Jul 2, 04:25 UTCJul 2, 04:45 UTC20m
2026-07-01 CSZ9881 SZX → HGH Jul 1, 23:30 UTCJul 1, 23:45 UTC15m
2026-06-26 CSZ901 - Jun 26, 16:30 UTCJun 26, 16:44 UTC15m
2026-05-18 CCA1339 PEK → CAN May 18, 04:20 UTCMay 18, 04:40 UTC20m

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 3h ago.
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, CCA847, CSZ9508, CSZ9101, CCA848.