Apparatus

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sensors Mode-S transponder

781ACE

ICAO 24-bit transponder address · allocated to China

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

Hex
781ACE
Octal
36015316
Decimal
7,871,182
Country
CN
Tail
B-321S
Type
A321
No current signal · last broadcast 1d ago
Flights observed
90
Distinct callsigns
12
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 781ACE.

Country allocation

The ICAO 24-bit address 781ACE 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 12 distinct

Callsign Airline Flights Last seen
CHB6230 - 22 2026-07-12
CHB6312 - 18 2026-07-11
CHB6333 - 17 2026-06-22
CHB6311 - 9 2026-07-12
CHB6334 - 8 2026-06-21
CHB6371 China West Air 5 2026-04-20
CHB6306 - 5 2026-07-09
CHB6229 China West Air 2 2026-05-23
CHB6543 - 1 2026-04-23
CHB6542 - 1 2026-07-10
CHB6305 - 1 2026-07-08
CHB6214 - 1 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 CHB6230 - Jul 12, 15:30 UTCJul 12, 15:50 UTC20m
2026-07-12 CHB6311 - Jul 12, 13:30 UTCJul 12, 13:40 UTC10m
2026-07-11 CHB6312 - Jul 11, 15:40 UTCJul 11, 15:55 UTC15m
2026-07-10 CHB6312 - Jul 10, 15:30 UTCJul 10, 15:40 UTC10m
2026-07-10 CHB6542 - Jul 10, 13:30 UTCJul 10, 13:55 UTC25m
2026-07-09 CHB6306 - Jul 9, 00:10 UTCJul 9, 02:15 UTC2h 5m
2026-07-08 CHB6306 - Jul 8, 04:25 UTCJul 9, 02:15 UTC21h 50m
2026-07-08 CHB6305 - Jul 8, 00:20 UTCJul 8, 00:30 UTC10m
2026-07-05 CHB6306 - Jul 5, 02:10 UTCJul 5, 02:30 UTC20m
2026-07-03 CHB6214 - Jul 3, 01:25 UTCJul 3, 04:20 UTC2h 55m
2026-07-02 CHB6230 - Jul 2, 17:15 UTCJul 2, 17:30 UTC15m
2026-06-22 CHB6312 - Jun 22, 17:25 UTCJun 22, 17:40 UTC15m
2026-06-22 CHB6333 - Jun 22, 02:59 UTCJun 22, 03:10 UTC10m
2026-06-21 CHB6230 - Jun 21, 16:39 UTCJun 21, 16:54 UTC15m
2026-06-21 CHB6334 - Jun 21, 14:44 UTCJun 21, 14:54 UTC10m
2026-06-20 CHB6306 - Jun 20, 01:44 UTCJun 20, 02:00 UTC15m
2026-06-19 CHB6230 - Jun 19, 17:04 UTCJun 19, 17:19 UTC15m
2026-06-17 CHB6312 - Jun 17, 17:15 UTCJun 17, 17:25 UTC10m
2026-06-17 CHB6334 TNA → SZX Jun 17, 15:20 UTCJun 17, 15:30 UTC10m
2026-06-17 CHB6333 - Jun 17, 03:40 UTCJun 17, 03:50 UTC10m
2026-06-16 CHB6230 - Jun 16, 18:20 UTCJun 16, 18:35 UTC15m
2026-06-16 CHB6334 TNA → SZX Jun 16, 16:20 UTCJun 16, 16:30 UTC10m
2026-06-16 CHB6333 - Jun 16, 02:45 UTCJun 16, 02:54 UTC10m
2026-06-15 CHB6230 - Jun 15, 20:25 UTCJun 15, 20:40 UTC15m
2026-06-15 CHB6334 TNA → SZX Jun 15, 18:35 UTCJun 15, 18:45 UTC10m
2026-06-15 CHB6333 - Jun 15, 02:10 UTCJun 15, 02:24 UTC15m
2026-06-12 CHB6230 SZX → CKG Jun 12, 15:55 UTCJun 12, 16:05 UTC10m
2026-06-08 CHB6312 SZX → CGO Jun 8, 19:10 UTCJun 8, 19:20 UTC10m
2026-06-08 CHB6334 TNA → SZX Jun 8, 17:15 UTCJun 8, 17:25 UTC10m
2026-06-08 CHB6333 SZX → TNA Jun 8, 02:15 UTCJun 8, 02:25 UTC10m
2026-06-07 CHB6230 SZX → CKG Jun 7, 17:45 UTCJun 7, 18:00 UTC15m
2026-06-07 CHB6311 CGO → SZX Jun 7, 16:15 UTCJun 7, 16:25 UTC10m
2026-06-06 CHB6312 SZX → CGO Jun 6, 18:14 UTCJun 6, 18:29 UTC15m
2026-06-06 CHB6311 CGO → SZX Jun 6, 16:30 UTCJun 6, 16:50 UTC20m
2026-06-03 CHB6312 SZX → CGO Jun 3, 15:25 UTCJun 3, 15:35 UTC10m
2026-06-02 CHB6312 SZX → CGO Jun 2, 15:30 UTCJun 2, 15:45 UTC15m
2026-06-02 CHB6311 CGO → SZX Jun 2, 14:00 UTCJun 2, 14:15 UTC15m
2026-06-01 CHB6312 SZX → CGO Jun 1, 15:30 UTCJun 1, 15:40 UTC10m
2026-05-29 CHB6312 SZX → CGO May 29, 17:25 UTCMay 29, 17:35 UTC10m
2026-05-29 CHB6334 TNA → SZX May 29, 15:40 UTCMay 29, 15:50 UTC10m
2026-05-29 CHB6333 SZX → TNA May 29, 02:10 UTCMay 29, 02:20 UTC10m
2026-05-28 CHB6230 SZX → CKG May 28, 15:45 UTCMay 28, 16:00 UTC15m
2026-05-28 CHB6333 SZX → TNA May 28, 01:50 UTCMay 28, 02:05 UTC15m
2026-05-25 CHB6230 SZX → CKG May 25, 16:10 UTCMay 25, 16:20 UTC10m
2026-05-24 CHB6230 SZX → CKG May 24, 16:45 UTCMay 24, 17:00 UTC15m
2026-05-24 CHB6334 TNA → SZX May 24, 14:35 UTCMay 24, 14:50 UTC15m
2026-05-24 CHB6333 SZX → TNA May 24, 02:05 UTCMay 24, 02:15 UTC10m
2026-05-23 CHB6230 SZX → CKG May 23, 16:20 UTCMay 23, 16:35 UTC15m
2026-05-23 CHB6333 SZX → TNA May 23, 01:55 UTCMay 23, 02:05 UTC10m
2026-05-23 CHB6229 CKG → SZX May 23, 00:25 UTCMay 23, 00:35 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-321S page for operator, model, and routing details .

Mode-S 781ACE frequently asked

What is Mode-S code 781ACE?
781ACE is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-321S.
Where is Mode-S 781ACE registered?
Mode-S code 781ACE is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781ACE broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781ACE, octal 36015316, decimal 7,871,182.
What flights does 781ACE operate?
Mode-S 781ACE has broadcast 12 distinct callsigns, including CHB6230, CHB6312, CHB6333, CHB6311, CHB6334.