Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781A9B

ICAO 24-bit transponder address · allocated to China

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

Hex
781A9B
Octal
36015233
Decimal
7,871,131
Country
CN
Tail
B-321F
Type
A21N
No current signal · last broadcast 1h ago
Flights observed
110
Distinct callsigns
20
Country
CN
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 781A9B.

Country allocation

The ICAO 24-bit address 781A9B 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
CQH6576 - 14 2026-06-27
CQH6575 - 13 2026-06-27
CQH6582 - 12 2026-06-27
CQH6566 - 12 2026-06-28
CQH6565 - 10 2026-06-27
CQH8950 - 7 2026-07-12
CQH8949 - 7 2026-07-14
CQH8918 - 5 2026-07-11
CQH8917 - 3 2026-07-05
CQH7519 Spring Airlines 3 2026-04-20
CQH8956 Spring Airlines 2 2026-05-30
CQH8955 Spring Airlines 2 2026-05-30
CQH8776 - 2 2026-07-05
CQH8775 - 2 2026-07-05
CQH7520 Spring Airlines 2 2026-04-20
CQH8931 Spring Airlines 1 2026-05-31
CQH8930 - 1 2026-07-10
CQH8929 Spring Airlines 1 2026-06-25
CQH8882 Spring Airlines 1 2026-05-23
CQH8881 Spring Airlines 1 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CQH8949 - Jul 14, 11:30 UTCJul 14, 11:50 UTC20m
2026-07-12 CQH8950 - Jul 12, 13:35 UTCJul 12, 13:45 UTC10m
2026-07-12 CQH8949 - Jul 12, 11:25 UTCJul 12, 11:45 UTC20m
2026-07-11 CQH8918 - Jul 11, 02:35 UTCJul 11, 02:45 UTC10m
2026-07-10 CQH8930 - Jul 10, 00:20 UTCJul 10, 10:05 UTC9h 45m
2026-07-08 CQH8950 - Jul 8, 14:30 UTCJul 8, 14:40 UTC10m
2026-07-08 CQH8949 - Jul 8, 12:10 UTCJul 8, 13:05 UTC55m
2026-07-06 CQH8950 - Jul 6, 15:35 UTCJul 6, 15:45 UTC10m
2026-07-06 CQH8949 - Jul 6, 13:30 UTCJul 6, 13:55 UTC25m
2026-07-05 CQH8776 - Jul 5, 11:25 UTCJul 5, 11:35 UTC10m
2026-07-05 CQH8775 - Jul 5, 08:55 UTCJul 5, 09:15 UTC20m
2026-07-05 CQH8917 - Jul 5, 00:25 UTCJul 5, 00:50 UTC25m
2026-07-03 CQH8918 - Jul 3, 02:20 UTCJul 3, 02:30 UTC10m
2026-06-28 CQH6566 - Jun 28, 06:00 UTCJun 28, 13:10 UTC7h 10m
2026-06-27 CQH6565 - Jun 27, 20:44 UTCJun 28, 04:29 UTC7h 45m
2026-06-27 CQH6582 KIX → BKK Jun 27, 11:59 UTCJun 27, 19:19 UTC7h 20m
2026-06-27 CQH6576 - Jun 27, 05:35 UTCJun 27, 10:40 UTC5h 5m
2026-06-27 CQH6575 - Jun 27, 03:20 UTCJun 27, 04:19 UTC1h 0m
2026-06-25 CQH8929 SHA → CAN Jun 25, 19:24 UTCJun 25, 19:34 UTC10m
2026-06-22 CQH7682 - Jun 22, 14:29 UTCJun 22, 15:20 UTC50m
2026-06-22 CQH6566 - Jun 22, 06:05 UTCJun 22, 07:10 UTC1h 5m
2026-06-21 CQH6565 - Jun 21, 19:50 UTCJun 22, 04:44 UTC8h 55m
2026-06-21 CQH8755 PVG → BKK Jun 21, 10:29 UTCJun 21, 18:35 UTC8h 5m
2026-06-21 CQH6576 KIX → KIX Jun 21, 03:49 UTCJun 21, 09:20 UTC5h 30m
2026-06-21 CQH6575 - Jun 21, 01:30 UTCJun 21, 02:35 UTC1h 5m
2026-06-20 CQH6575 - Jun 20, 05:54 UTCJun 21, 02:35 UTC20h 40m
2026-06-17 CQH8836 - Jun 17, 03:30 UTCJun 17, 03:40 UTC10m
2026-06-15 CQH6566 - Jun 15, 06:04 UTCJun 15, 07:05 UTC1h 0m
2026-06-14 CQH8756 - Jun 14, 20:05 UTCJun 15, 04:34 UTC8h 30m
2026-06-14 CQH6582 - Jun 14, 10:55 UTCJun 14, 18:45 UTC7h 50m
2026-06-14 CQH6576 - Jun 14, 03:30 UTCJun 14, 09:25 UTC5h 55m
2026-06-13 CQH6575 - Jun 13, 06:50 UTCJun 14, 02:00 UTC19h 10m
2026-06-13 CQH6566 KIX → PVG Jun 13, 06:25 UTCJun 14, 02:00 UTC19h 35m
2026-06-13 CQH6565 - Jun 13, 04:10 UTCJun 13, 05:15 UTC1h 5m
2026-06-07 CQH6582 KIX → PVG Jun 7, 11:05 UTCJun 7, 11:50 UTC45m
2026-06-07 CQH6576 KIX → PVG Jun 7, 03:35 UTCJun 7, 09:15 UTC5h 40m
2026-06-07 CQH6575 PVG → KIX Jun 7, 01:24 UTCJun 7, 02:10 UTC45m
2026-06-06 CQH6575 PVG → KIX Jun 6, 06:20 UTCJun 7, 02:10 UTC19h 50m
2026-06-05 CQH8918 SZX → SHA Jun 5, 02:40 UTCJun 5, 02:55 UTC15m
2026-06-05 CQH8917 SHA → SZX Jun 5, 00:55 UTCJun 5, 01:05 UTC10m
2026-06-04 CQH8950 SZX → SHA Jun 4, 13:30 UTCJun 4, 13:45 UTC15m
2026-06-03 CQH8918 SZX → SHA Jun 3, 02:25 UTCJun 3, 02:40 UTC15m
2026-06-01 CQH8855 SHA → CAN Jun 1, 06:45 UTCJun 1, 06:55 UTC10m
2026-05-31 CQH8931 SHA → CAN May 31, 12:05 UTCMay 31, 12:15 UTC10m
2026-05-30 CQH8956 SZX → SHA May 30, 23:30 UTCMay 30, 23:40 UTC10m
2026-05-30 CQH8955 SHA → SZX May 30, 15:45 UTCMay 30, 16:00 UTC15m
2026-05-30 CQH8776 SZX → SHA May 30, 10:05 UTCMay 30, 10:30 UTC25m
2026-05-30 CQH8775 SHA → SZX May 30, 08:10 UTCMay 30, 08:25 UTC15m
2026-05-30 CQH8835 SHA → CAN May 30, 01:10 UTCMay 30, 01:20 UTC10m
2026-05-29 - - May 29, 09:25 UTCMay 29, 09:35 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-321F page for operator, model, and routing details .

Mode-S 781A9B frequently asked

What is Mode-S code 781A9B?
781A9B is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-321F.
Where is Mode-S 781A9B registered?
Mode-S code 781A9B is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781A9B broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781A9B, octal 36015233, decimal 7,871,131.
What flights does 781A9B operate?
Mode-S 781A9B has broadcast 20 distinct callsigns, including CQH6576, CQH6575, CQH6582, CQH6566, CQH6565.