Apparatus

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sensors Mode-S transponder

781ACF

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-321T · AIRBUS A-321

Hex
781ACF
Octal
36015317
Decimal
7,871,183
Country
CN
Tail
B-321T
Type
A321
No current signal · last broadcast Jul 25, 15:30 UTC
Flights observed
94
Distinct callsigns
14
Country
CN
Last broadcast
Jul 25, 15:30 UTC

Last known position

Most recent position reported by Mode-S 781ACF.

Country allocation

The ICAO 24-bit address 781ACF 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 14 distinct

Callsign Airline Flights Last seen
CHB6312 China West Air 20 2026-07-17
CHB6230 China West Air 18 2026-07-25
CHB6311 - 16 2026-07-18
CHB6333 - 9 2026-06-19
CHB6544 China West Air 7 2026-07-25
CHB6334 - 6 2026-06-19
CHB6543 - 3 2026-07-23
CHB6371 China West Air 3 2026-04-22
CHB6306 - 3 2026-07-24
CHB6542 - 2 2026-07-12
CHB6541 - 2 2026-07-12
CHB6305 - 2 2026-07-24
CHB6276 China West Air 1 2026-07-24
CHB6229 - 1 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CHB6230 SZX → CKG Jul 25, 15:15 UTCJul 25, 15:30 UTC15m
2026-07-25 CHB6544 HET → TNA Jul 25, 09:05 UTCJul 25, 09:30 UTC25m
2026-07-24 CHB6276 FOC → CKG Jul 24, 16:15 UTCJul 24, 16:25 UTC10m
2026-07-24 CHB6306 - Jul 24, 02:05 UTCJul 24, 10:20 UTC8h 15m
2026-07-24 CHB6305 - Jul 24, 00:10 UTCJul 24, 00:20 UTC10m
2026-07-23 CHB6230 SZX → CKG Jul 23, 15:20 UTCJul 23, 15:35 UTC15m
2026-07-23 CHB6544 HET → TNA Jul 23, 13:30 UTCJul 23, 13:55 UTC25m
2026-07-23 CHB6544 - Jul 23, 08:35 UTCJul 23, 09:05 UTC30m
2026-07-23 CHB6543 - Jul 23, 01:50 UTCJul 23, 02:00 UTC10m
2026-07-19 CHB6306 - Jul 19, 01:55 UTCJul 19, 09:25 UTC7h 30m
2026-07-18 CHB6305 - Jul 18, 23:55 UTCJul 19, 00:05 UTC10m
2026-07-18 CHB6230 SZX → CKG Jul 18, 15:20 UTCJul 18, 15:35 UTC15m
2026-07-18 CHB6311 - Jul 18, 13:40 UTCJul 18, 13:55 UTC15m
2026-07-17 CHB6312 SZX → CGO Jul 17, 15:20 UTCJul 17, 15:35 UTC15m
2026-07-17 CHB6311 - Jul 17, 13:35 UTCJul 17, 13:50 UTC15m
2026-07-15 CHB6312 - Jul 15, 16:20 UTCJul 15, 16:30 UTC10m
2026-07-15 CHB6311 - Jul 15, 14:30 UTCJul 15, 14:50 UTC20m
2026-07-14 CHB6311 - Jul 14, 13:40 UTCJul 14, 13:50 UTC10m
2026-07-13 CHB6312 - Jul 13, 15:25 UTCJul 13, 15:35 UTC10m
2026-07-12 CHB6312 - Jul 12, 15:30 UTCJul 12, 15:45 UTC15m
2026-07-12 CHB6542 - Jul 12, 13:35 UTCJul 12, 13:45 UTC10m
2026-07-12 CHB6541 - Jul 12, 01:45 UTCJul 12, 01:55 UTC10m
2026-07-09 CHB6230 - Jul 9, 18:00 UTCJul 9, 18:20 UTC20m
2026-07-09 CHB6311 - Jul 9, 16:05 UTCJul 9, 16:20 UTC15m
2026-07-08 CHB6312 - Jul 8, 18:45 UTCJul 8, 18:55 UTC10m
2026-07-08 CHB6542 - Jul 8, 16:35 UTCJul 8, 16:50 UTC15m
2026-07-08 CHB6541 - Jul 8, 01:50 UTCJul 8, 02:00 UTC10m
2026-07-07 CHB6544 - Jul 7, 13:40 UTCJul 7, 14:05 UTC25m
2026-07-07 CHB6543 - Jul 7, 06:05 UTCJul 7, 06:15 UTC10m
2026-07-05 CHB6230 - Jul 5, 15:35 UTCJul 5, 15:50 UTC15m
2026-07-05 CHB6311 - Jul 5, 13:55 UTCJul 5, 14:15 UTC20m
2026-07-02 CHB6312 - Jul 2, 16:20 UTCJul 2, 16:30 UTC10m
2026-07-02 CHB6544 - Jul 2, 14:55 UTCJul 2, 15:10 UTC15m
2026-07-02 CHB6544 - Jul 2, 08:45 UTCJul 2, 09:10 UTC25m
2026-07-02 CHB6543 - Jul 2, 02:00 UTCJul 2, 02:10 UTC10m
2026-06-22 CHB6230 - Jun 22, 15:50 UTCJun 22, 16:10 UTC20m
2026-06-19 CHB6312 - Jun 19, 19:25 UTCJun 19, 19:34 UTC10m
2026-06-19 CHB6334 - Jun 19, 17:09 UTCJun 19, 17:29 UTC20m
2026-06-19 CHB6333 - Jun 19, 05:19 UTCJun 19, 05:30 UTC10m
2026-06-19 CHB6229 - Jun 19, 00:24 UTCJun 19, 00:40 UTC15m
2026-06-17 CHB6230 - Jun 17, 16:35 UTCJun 17, 16:50 UTC15m
2026-06-17 CHB6311 - Jun 17, 14:55 UTCJun 17, 15:15 UTC20m
2026-06-11 CHB6312 SZX → CGO Jun 11, 16:35 UTCJun 11, 16:45 UTC10m
2026-06-11 CHB6333 SZX → TNA Jun 11, 02:05 UTCJun 11, 02:15 UTC10m
2026-06-08 CHB6230 SZX → CKG Jun 8, 19:15 UTCJun 8, 19:30 UTC15m
2026-06-08 CHB6311 CGO → SZX Jun 8, 17:35 UTCJun 8, 17:45 UTC10m
2026-06-05 CHB6312 SZX → CGO Jun 5, 16:25 UTCJun 5, 16:35 UTC10m
2026-06-05 CHB6311 CGO → SZX Jun 5, 14:55 UTCJun 5, 15:05 UTC10m
2026-06-04 CHB6312 SZX → CGO Jun 4, 17:05 UTCJun 4, 17:20 UTC15m
2026-05-31 CHB6312 SZX → CGO May 31, 16:00 UTCMay 31, 16:10 UTC10m

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-321T page for operator, model, and routing details .

Mode-S 781ACF frequently asked

What is Mode-S code 781ACF?
781ACF is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-321T.
Where is Mode-S 781ACF registered?
Mode-S code 781ACF is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781ACF broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 15:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781ACF, octal 36015317, decimal 7,871,183.
What flights does 781ACF operate?
Mode-S 781ACF has broadcast 14 distinct callsigns, including CHB6312, CHB6230, CHB6311, CHB6333, CHB6544.