Apparatus

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sensors Mode-S transponder

781E51

ICAO 24-bit transponder address · allocated to China

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

Hex
781E51
Octal
36017121
Decimal
7,872,081
Country
CN
Tail
B-32CF
Type
A21N
No current signal · last broadcast 5h ago
Flights observed
330
Distinct callsigns
20
Country
CN
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 781E51.

Country allocation

The ICAO 24-bit address 781E51 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 - 26 2026-07-12
CSZ9074 - 21 2026-07-02
CSZ9073 - 21 2026-07-02
CSZ9105 - 17 2026-07-12
CSZ9114 - 16 2026-07-12
CSZ9802 - 14 2026-07-05
CSZ9801 Shenzhen Airlines 13 2026-07-04
CSZ9113 - 11 2026-07-11
CSZ9110 - 10 2026-07-08
CSZ9104 - 10 2026-07-17
CSZ9109 - 9 2026-07-08
CSZ9512 Shenzhen Airlines 8 2026-06-11
CSZ9506 - 7 2026-06-19
CSZ9505 Shenzhen Airlines 6 2026-06-03
CSZ9209 - 6 2026-06-18
CSZ9102 - 6 2026-06-22
CSZ9103 - 5 2026-07-17
CSZ9101 Shenzhen Airlines 5 2026-06-21
CSZ9929 - 4 2026-07-16
CSZ9812 Shenzhen Airlines 4 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CSZ9468 - Jul 17, 16:59 UTCJul 17, 17:09 UTC10m
2026-07-17 CSZ9467 - Jul 17, 11:04 UTCJul 17, 11:20 UTC15m
2026-07-17 CSZ9104 - Jul 17, 09:25 UTCJul 17, 09:40 UTC15m
2026-07-17 CSZ9104 - Jul 17, 06:54 UTCJul 17, 07:05 UTC10m
2026-07-17 CSZ9103 - Jul 17, 02:15 UTCJul 17, 02:30 UTC15m
2026-07-16 CSZ9948 - Jul 16, 15:35 UTCJul 16, 16:00 UTC25m
2026-07-16 CSZ9947 - Jul 16, 10:40 UTCJul 16, 10:50 UTC10m
2026-07-16 CSZ9930 - Jul 16, 09:10 UTCJul 16, 09:20 UTC10m
2026-07-16 CSZ9929 - Jul 16, 01:30 UTCJul 16, 01:40 UTC10m
2026-07-15 CSZ9108 - Jul 15, 14:05 UTCJul 15, 14:20 UTC15m
2026-07-15 CSZ9108 - Jul 15, 11:40 UTCJul 15, 11:55 UTC15m
2026-07-15 CSZ9107 - Jul 15, 09:20 UTCJul 15, 09:30 UTC10m
2026-07-15 CSZ9107 - Jul 15, 06:50 UTCJul 15, 07:00 UTC10m
2026-07-15 CSZ9882 - Jul 15, 04:15 UTCJul 15, 04:25 UTC10m
2026-07-14 CSZ9881 - Jul 14, 23:25 UTCJul 14, 23:35 UTC10m
2026-07-14 CSZ9468 - Jul 14, 16:20 UTCJul 14, 16:30 UTC10m
2026-07-14 CSZ9467 - Jul 14, 11:25 UTCJul 14, 11:40 UTC15m
2026-07-14 CSZ9104 - Jul 14, 09:50 UTCJul 14, 10:15 UTC25m
2026-07-14 CSZ9104 - Jul 14, 07:10 UTCJul 14, 07:30 UTC20m
2026-07-14 CSZ9103 - Jul 14, 02:15 UTCJul 14, 02:30 UTC15m
2026-07-13 CSZ9468 - Jul 13, 16:10 UTCJul 13, 16:20 UTC10m
2026-07-13 CSZ9467 - Jul 13, 11:10 UTCJul 13, 11:25 UTC15m
2026-07-13 CSZ9104 - Jul 13, 09:20 UTCJul 13, 09:30 UTC10m
2026-07-13 CSZ9104 - Jul 13, 06:45 UTCJul 13, 07:10 UTC25m
2026-07-13 CSZ9103 - Jul 13, 02:20 UTCJul 13, 02:35 UTC15m
2026-07-12 CSZ9318 - Jul 12, 16:20 UTCJul 12, 16:40 UTC20m
2026-07-12 CSZ9313 - Jul 12, 13:40 UTCJul 12, 13:50 UTC10m
2026-07-12 CSZ9106 - Jul 12, 11:45 UTCJul 12, 12:05 UTC20m
2026-07-12 CSZ9106 - Jul 12, 09:15 UTCJul 12, 09:40 UTC25m
2026-07-12 CSZ9105 - Jul 12, 04:45 UTCJul 12, 05:05 UTC20m
2026-07-12 CSZ9114 - Jul 12, 02:45 UTCJul 12, 03:01 UTC15m
2026-07-12 CSZ9114 - Jul 12, 00:15 UTCJul 12, 00:40 UTC25m
2026-07-11 CSZ9113 - Jul 11, 18:05 UTCJul 11, 18:15 UTC10m
2026-07-11 CSZ9113 - Jul 11, 14:10 UTCJul 11, 14:20 UTC10m
2026-07-11 CSZ9104 - Jul 11, 10:35 UTCJul 11, 10:50 UTC15m
2026-07-11 CSZ9104 - Jul 11, 08:01 UTCJul 11, 08:20 UTC20m
2026-07-11 CSZ9103 - Jul 11, 02:15 UTCJul 11, 02:35 UTC20m
2026-07-10 CSZ9948 - Jul 10, 14:05 UTCJul 10, 14:20 UTC15m
2026-07-10 CSZ9514 - Jul 10, 05:35 UTCJul 10, 06:20 UTC45m
2026-07-10 CSZ9513 - Jul 10, 01:15 UTCJul 10, 01:25 UTC10m
2026-07-09 CSZ9944 - Jul 9, 06:05 UTCJul 9, 06:20 UTC15m
2026-07-09 CSZ9943 - Jul 9, 01:25 UTCJul 9, 01:35 UTC10m
2026-07-08 CSZ9110 - Jul 8, 16:55 UTCJul 8, 17:20 UTC25m
2026-07-08 CSZ9110 - Jul 8, 14:35 UTCJul 8, 14:55 UTC20m
2026-07-08 CSZ9109 - Jul 8, 10:25 UTCJul 8, 10:45 UTC20m
2026-07-08 CSZ9403 - Jul 8, 00:55 UTCJul 8, 01:10 UTC15m
2026-07-07 CSZ9104 - Jul 7, 15:55 UTCJul 7, 16:15 UTC20m
2026-07-07 CSZ9104 - Jul 7, 13:25 UTCJul 7, 13:45 UTC20m
2026-07-07 CSZ9103 - Jul 7, 04:15 UTCJul 7, 04:25 UTC10m
2026-07-06 - - Jul 6, 15:35 UTCJul 6, 15:55 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-32CF page for operator, model, and routing details .

Mode-S 781E51 frequently asked

What is Mode-S code 781E51?
781E51 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32CF.
Where is Mode-S 781E51 registered?
Mode-S code 781E51 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781E51 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781E51, octal 36017121, decimal 7,872,081.
What flights does 781E51 operate?
Mode-S 781E51 has broadcast 20 distinct callsigns, including CSZ9106, CSZ9074, CSZ9073, CSZ9105, CSZ9114.