Apparatus

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sensors Mode-S transponder

781C2A

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-325F · AIRBUS A-321neo

Hex
781C2A
Octal
36016052
Decimal
7,871,530
Country
CN
Tail
B-325F
Type
A21N
No current signal · last broadcast 17h ago
Flights observed
120
Distinct callsigns
20
Country
CN
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S 781C2A.

Country allocation

The ICAO 24-bit address 781C2A 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
CSC3961 - 24 2026-07-14
CSC3909 - 17 2026-07-04
CSC3962 - 16 2026-07-15
CSC3924 Sichuan Airlines 13 2026-07-21
CSC3923 Sichuan Airlines 9 2026-07-21
CSC3910 - 9 2026-07-04
CSC6788 Sichuan Airlines 8 2026-07-21
CSC3995 - 4 2026-07-03
CSC3986 - 3 2026-07-08
CSC3985 Sichuan Airlines 3 2026-07-20
CSC3996 Sichuan Airlines 2 2026-05-01
CSC3993 Sichuan Airlines 2 2026-05-07
CSC3122 Sichuan Airlines 2 2026-05-28
CSC3121 Sichuan Airlines 2 2026-05-28
CSC3994 Sichuan Airlines 1 2026-05-07
CSC3938 - 1 2026-07-15
CSC3937 - 1 2026-07-15
CSC3912 - 1 2026-07-05
CSC3911 - 1 2026-07-05
CSC3903 - 1 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 CSC3924 MLE → TFU Jul 21, 19:45 UTCJul 21, 20:20 UTC35m
2026-07-21 CSC3923 TFU → MLE Jul 21, 10:20 UTCJul 21, 19:40 UTC9h 20m
2026-07-21 CSC6788 ZUH → TFU Jul 21, 05:30 UTCJul 21, 05:45 UTC15m
2026-07-20 CSC3985 TFU → DPS Jul 20, 09:10 UTCJul 20, 20:05 UTC10h 55m
2026-07-20 CSC6788 ZUH → TFU Jul 20, 04:05 UTCJul 20, 04:15 UTC10m
2026-07-15 CSC3938 - Jul 15, 18:25 UTCJul 15, 18:50 UTC25m
2026-07-15 CSC3937 - Jul 15, 16:40 UTCJul 15, 16:55 UTC15m
2026-07-15 CSC3962 - Jul 15, 08:00 UTCJul 15, 09:35 UTC1h 35m
2026-07-14 CSC3961 - Jul 14, 18:25 UTCJul 15, 06:20 UTC11h 54m
2026-07-14 CSC3962 - Jul 14, 07:50 UTCJul 14, 17:00 UTC9h 10m
2026-07-14 CSC3961 - Jul 14, 04:20 UTCJul 14, 06:15 UTC1h 55m
2026-07-11 CSC3924 - Jul 11, 10:30 UTCJul 11, 20:20 UTC9h 50m
2026-07-10 CSC6788 - Jul 10, 04:15 UTCJul 10, 04:25 UTC10m
2026-07-08 CSC3986 - Jul 8, 10:50 UTCJul 8, 22:10 UTC11h 20m
2026-07-07 CSC3924 - Jul 7, 16:35 UTCJul 8, 11:15 UTC18h 40m
2026-07-07 CSC3924 - Jul 7, 16:05 UTCJul 8, 11:15 UTC19h 10m
2026-07-07 CSC3924 - Jul 7, 12:55 UTCJul 8, 11:15 UTC22h 20m
2026-07-07 CSC3924 - Jul 7, 09:55 UTCJul 7, 20:15 UTC10h 20m
2026-07-05 CSC3912 - Jul 5, 17:05 UTCJul 5, 18:55 UTC1h 50m
2026-07-05 CSC3911 - Jul 5, 13:25 UTCJul 5, 15:55 UTC2h 30m
2026-07-04 CSC3910 - Jul 4, 09:30 UTCJul 4, 12:30 UTC3h 0m
2026-07-04 CSC3909 - Jul 4, 04:20 UTCJul 4, 07:20 UTC3h 0m
2026-07-03 CSC3909 - Jul 3, 10:35 UTCJul 4, 07:20 UTC20h 45m
2026-07-03 CSC3909 - Jul 3, 08:55 UTCJul 4, 07:20 UTC22h 25m
2026-07-03 CSC3909 - Jul 3, 07:40 UTCJul 4, 05:55 UTC22h 15m
2026-07-03 CSC3995 - Jul 3, 05:45 UTCJul 3, 06:05 UTC20m
2026-07-02 CSC3924 - Jul 2, 10:35 UTCJul 3, 04:50 UTC18h 15m
2026-07-02 CSC3924 - Jul 2, 10:05 UTCJul 3, 04:50 UTC18h 45m
2026-07-02 CSC6788 - Jul 2, 04:25 UTCJul 2, 04:40 UTC15m
2026-06-30 CSC3903 - Jun 30, 13:05 UTCJul 1, 02:50 UTC13h 45m
2026-06-29 CSC3986 DPS → TFU Jun 29, 19:39 UTCJun 30, 13:40 UTC18h 1m
2026-06-29 CSC3985 - Jun 29, 09:05 UTCJun 29, 20:15 UTC11h 10m
2026-06-29 CSC6788 - Jun 29, 04:14 UTCJun 29, 04:25 UTC10m
2026-06-27 CSC6788 - Jun 27, 04:19 UTCJun 27, 04:29 UTC10m
2026-06-10 CSC3910 SIN → TFU Jun 10, 09:10 UTCJun 10, 11:50 UTC2h 40m
2026-06-09 CSC3909 TFU → SIN Jun 9, 18:25 UTCJun 10, 06:55 UTC12h 30m
2026-06-09 CSC3962 NRT → TFU Jun 9, 07:55 UTCJun 9, 17:10 UTC9h 15m
2026-06-09 CSC3961 TFU → NRT Jun 9, 04:10 UTCJun 9, 05:35 UTC1h 25m
2026-06-07 CSC3985 TFU → DPS Jun 7, 08:55 UTCJun 7, 20:10 UTC11h 15m
2026-06-05 CSC3962 NRT → TFU Jun 5, 08:00 UTCJun 5, 09:35 UTC1h 35m
2026-06-04 CSC3923 TFU → MLE Jun 4, 10:35 UTCJun 5, 05:25 UTC18h 50m
2026-06-03 CSC3923 TFU → MLE Jun 3, 14:35 UTCJun 4, 13:55 UTC23h 20m
2026-06-03 CSC3962 NRT → TFU Jun 3, 13:30 UTCJun 4, 12:10 UTC22h 40m
2026-06-02 CSC3961 TFU → NRT Jun 2, 16:35 UTCJun 3, 11:35 UTC19h 0m
2026-06-02 CSC3924 MLE → TFU Jun 2, 16:10 UTCJun 3, 11:35 UTC19h 25m
2026-06-02 CSC3924 MLE → TFU Jun 2, 12:40 UTCJun 3, 11:35 UTC22h 55m
2026-06-02 CSC3923 TFU → MLE Jun 2, 10:35 UTCJun 3, 10:30 UTC23h 55m
2026-06-02 CSC3923 TFU → MLE Jun 2, 10:25 UTCJun 2, 19:45 UTC9h 20m
2026-06-01 CSC3910 SIN → TFU Jun 1, 10:35 UTCJun 2, 10:30 UTC23h 55m
2026-06-01 CSC3910 SIN → TFU Jun 1, 09:05 UTCJun 1, 11:35 UTC2h 30m

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-325F page for operator, model, and routing details .

Mode-S 781C2A frequently asked

What is Mode-S code 781C2A?
781C2A is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-325F.
Where is Mode-S 781C2A registered?
Mode-S code 781C2A is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781C2A broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781C2A, octal 36016052, decimal 7,871,530.
What flights does 781C2A operate?
Mode-S 781C2A has broadcast 20 distinct callsigns, including CSC3961, CSC3909, CSC3962, CSC3924, CSC3923.