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 12h ago
Flights observed
52
Distinct callsigns
9
Country
CN
Last broadcast
12h 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 9 distinct

Callsign Airline Flights Last seen
CHB6230 China West Air 14 2026-05-28
CHB6333 China West Air 12 2026-05-29
CHB6312 China West Air 9 2026-05-29
CHB6371 China West Air 5 2026-04-20
CHB6311 China West Air 5 2026-05-15
CHB6334 China West Air 3 2026-05-29
CHB6229 China West Air 2 2026-05-23
CHB6543 - 1 2026-04-23
CHB6306 - 1 2026-04-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-05-22 CHB6230 SZX → CKG May 22, 16:00 UTCMay 22, 16:15 UTC15m
2026-05-21 CHB6312 SZX → CGO May 21, 22:05 UTCMay 21, 22:20 UTC15m
2026-05-21 CHB6333 SZX → TNA May 21, 05:50 UTCMay 21, 06:00 UTC10m
2026-05-20 CHB6230 SZX → CKG May 20, 18:05 UTCMay 20, 18:25 UTC20m
2026-05-20 CHB6333 SZX → TNA May 20, 02:05 UTCMay 20, 02:15 UTC10m
2026-05-19 CHB6230 SZX → CKG May 19, 16:55 UTCMay 19, 17:10 UTC15m
2026-05-19 CHB6334 TNA → SZX May 19, 14:35 UTCMay 19, 14:45 UTC10m
2026-05-19 CHB6333 SZX → TNA May 19, 01:55 UTCMay 19, 02:05 UTC10m
2026-05-19 CHB6229 CKG → SZX May 19, 00:15 UTCMay 19, 00:25 UTC10m
2026-05-17 CHB6230 SZX → CKG May 17, 18:01 UTCMay 17, 18:10 UTC10m
2026-05-15 CHB6312 SZX → CGO May 15, 18:25 UTCMay 15, 18:35 UTC10m
2026-05-15 CHB6311 CGO → SZX May 15, 17:05 UTCMay 15, 17:20 UTC15m
2026-05-13 CHB6312 SZX → CGO May 13, 16:15 UTCMay 13, 16:25 UTC10m
2026-05-13 CHB6333 SZX → TNA May 13, 01:50 UTCMay 13, 02:00 UTC10m
2026-05-10 CHB6230 SZX → CKG May 10, 15:49 UTCMay 10, 16:10 UTC20m
2026-05-09 CHB6230 SZX → CKG May 9, 16:05 UTCMay 9, 16:15 UTC10m
2026-05-09 CHB6333 SZX → TNA May 9, 02:00 UTCMay 9, 02:10 UTC10m
2026-05-07 CHB6230 SZX → CKG May 7, 15:50 UTCMay 7, 16:05 UTC15m
2026-05-07 CHB6333 SZX → TNA May 7, 02:15 UTCMay 7, 02:25 UTC10m
2026-05-04 CHB6230 SZX → CKG May 4, 16:05 UTCMay 4, 16:20 UTC15m
2026-05-03 CHB6333 SZX → TNA May 3, 02:00 UTCMay 3, 02:15 UTC15m
2026-04-27 CHB6230 SZX → CKG Apr 27, 16:05 UTCApr 27, 16:15 UTC10m
2026-04-27 CHB6333 SZX → TNA Apr 27, 02:30 UTCApr 27, 02:40 UTC10m
2026-04-23 CHB6230 SZX → CKG Apr 23, 19:40 UTCApr 23, 19:50 UTC10m
2026-04-23 CHB6543 - Apr 23, 02:10 UTCApr 23, 02:25 UTC15m
2026-04-22 CHB6306 - Apr 22, 15:15 UTCApr 22, 15:30 UTC15m
2026-04-20 CHB6312 SZX → CGO Apr 20, 16:05 UTCApr 20, 16:20 UTC15m
2026-04-20 CHB6311 CGO → SZX Apr 20, 14:15 UTCApr 20, 14:25 UTC10m
2026-04-20 CHB6371 KOW → SYX Apr 20, 03:05 UTCApr 20, 07:15 UTC4h 10m
2026-04-19 CHB6371 KOW → SYX Apr 19, 07:20 UTCApr 20, 03:15 UTC19h 55m
2026-04-19 CHB6371 KOW → SYX Apr 19, 03:35 UTCApr 20, 03:15 UTC23h 40m
2026-04-19 CHB6371 KOW → SYX Apr 19, 03:20 UTCApr 19, 07:20 UTC4h 0m
2026-04-18 CHB6312 SZX → CGO Apr 18, 17:05 UTCApr 18, 17:20 UTC15m
2026-04-18 CHB6311 CGO → SZX Apr 18, 14:50 UTCApr 18, 15:00 UTC10m
2026-04-17 CHB6312 SZX → CGO Apr 17, 19:10 UTCApr 17, 19:20 UTC10m
2026-04-17 CHB6311 CGO → SZX Apr 17, 17:45 UTCApr 17, 18:05 UTC20m
2026-04-16 CHB6312 SZX → CGO Apr 16, 17:54 UTCApr 16, 18:15 UTC20m
2026-04-16 CHB6311 CGO → SZX Apr 16, 16:15 UTCApr 16, 16:35 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-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 12h 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 9 distinct callsigns, including CHB6230, CHB6333, CHB6312, CHB6371, CHB6311.