Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781D40

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-328J · AIRBUS A-320neo

Hex
781D40
Octal
36016500
Decimal
7,871,808
Country
CN
Tail
B-328J
Type
A20N
No current signal · last broadcast 7h ago
Flights observed
105
Distinct callsigns
20
Country
CN
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 781D40.

Country allocation

The ICAO 24-bit address 781D40 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
CQH8666 - 6 2026-07-01
CQH8665 - 6 2026-07-02
CQH8597 - 5 2026-07-12
CQH8598 - 4 2026-07-12
CQH8952 Spring Airlines 3 2026-06-15
CQH7281 - 3 2026-07-13
CQH8891 - 2 2026-07-15
CQH8792 - 2 2026-07-14
CQH8779 Spring Airlines 2 2026-04-22
CQH8516 Spring Airlines 2 2026-06-04
CQH8515 Spring Airlines 2 2026-06-04
CQH7341 - 2 2026-06-20
CQH6988 - 2 2026-06-19
CQH6987 - 2 2026-06-19
CQH6826 - 2 2026-05-17
CQH6825 - 2 2026-05-17
CQH6515 Spring Airlines 2 2026-04-30
CQH6465 - 2 2026-07-07
CQH6334 - 2 2026-06-29
CQH6294 Spring Airlines 2 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CQH6481 - Jul 17, 22:35 UTCJul 17, 22:45 UTC10m
2026-07-17 CQH6728 NNY → SZX Jul 17, 17:09 UTCJul 17, 17:25 UTC15m
2026-07-17 CQH6727 - Jul 17, 10:55 UTCJul 17, 11:15 UTC20m
2026-07-17 CQH8672 - Jul 17, 09:15 UTCJul 17, 09:30 UTC15m
2026-07-17 CQH8859 - Jul 17, 00:40 UTCJul 17, 04:25 UTC3h 45m
2026-07-15 CQH8892 - Jul 15, 07:10 UTCJul 15, 09:25 UTC2h 15m
2026-07-15 CQH8891 - Jul 15, 05:05 UTCJul 15, 05:25 UTC20m
2026-07-15 CQH8891 - Jul 15, 03:15 UTCJul 15, 03:45 UTC30m
2026-07-14 CQH8792 - Jul 14, 06:05 UTCJul 15, 03:45 UTC21h 39m
2026-07-14 CQH8792 - Jul 14, 05:05 UTCJul 15, 03:45 UTC22h 39m
2026-07-13 CQH8791 - Jul 13, 11:35 UTCJul 14, 03:50 UTC16h 15m
2026-07-13 CQH7281 - Jul 13, 09:50 UTCJul 13, 10:05 UTC15m
2026-07-13 CQH6610 - Jul 13, 03:10 UTCJul 13, 08:01 UTC4h 50m
2026-07-13 CQH6609 - Jul 13, 01:01 UTCJul 13, 01:15 UTC15m
2026-07-12 CQH8598 - Jul 12, 12:20 UTCJul 12, 16:15 UTC3h 55m
2026-07-12 CQH8597 - Jul 12, 07:31 UTCJul 12, 10:50 UTC3h 20m
2026-07-10 CQH8671 - Jul 10, 22:35 UTCJul 10, 22:50 UTC15m
2026-07-10 CQH6874 - Jul 10, 11:55 UTCJul 10, 16:35 UTC4h 40m
2026-07-09 CQH7286 - Jul 9, 01:50 UTCJul 9, 04:00 UTC2h 10m
2026-07-09 CQH7419 - Jul 9, 00:15 UTCJul 9, 00:40 UTC25m
2026-07-07 CQH6466 - Jul 7, 08:30 UTCJul 7, 10:00 UTC1h 30m
2026-07-07 CQH6465 - Jul 7, 06:35 UTCJul 7, 07:05 UTC30m
2026-07-07 CQH6465 - Jul 7, 05:25 UTCJul 7, 05:50 UTC25m
2026-07-04 CQH8512 - Jul 4, 01:50 UTCJul 4, 03:10 UTC1h 20m
2026-07-03 CQH8934 - Jul 3, 15:55 UTCJul 4, 00:30 UTC8h 35m
2026-07-03 CQH8511 - Jul 3, 13:25 UTCJul 3, 14:50 UTC1h 25m
2026-07-02 CQH8665 - Jul 2, 01:45 UTCJul 2, 09:45 UTC8h 0m
2026-07-01 CQH8665 - Jul 1, 12:05 UTCJul 2, 09:45 UTC21h 40m
2026-07-01 CQH8666 - Jul 1, 11:05 UTCJul 2, 09:45 UTC22h 40m
2026-07-01 CQH8666 - Jul 1, 09:20 UTCJul 2, 08:00 UTC22h 40m
2026-07-01 CQH8665 - Jul 1, 06:10 UTCJul 2, 04:15 UTC22h 5m
2026-07-01 CQH8665 - Jul 1, 04:20 UTCJul 2, 04:00 UTC23h 40m
2026-06-30 CQH8666 - Jun 30, 12:10 UTCJul 1, 12:00 UTC23h 50m
2026-06-30 CQH8665 - Jun 30, 10:05 UTCJul 1, 10:00 UTC23h 55m
2026-06-30 CQH7282 - Jun 30, 09:55 UTCJul 1, 06:50 UTC20h 55m
2026-06-29 CQH7281 - Jun 29, 15:49 UTCJun 30, 08:40 UTC16h 51m
2026-06-29 CQH7281 - Jun 29, 10:10 UTCJun 30, 08:40 UTC22h 31m
2026-06-29 CQH6334 - Jun 29, 05:00 UTCJun 29, 16:50 UTC11h 50m
2026-06-28 CQH6334 - Jun 28, 12:05 UTCJun 29, 10:24 UTC22h 20m
2026-06-28 CQH8598 - Jun 28, 11:55 UTCJun 29, 05:15 UTC17h 20m
2026-06-28 CQH8598 - Jun 28, 08:44 UTCJun 29, 05:15 UTC20h 30m
2026-06-28 CQH8597 - Jun 28, 03:29 UTCJun 28, 06:49 UTC3h 20m
2026-06-27 CQH8597 - Jun 27, 08:05 UTCJun 28, 06:49 UTC22h 45m
2026-06-27 CQH8666 - Jun 27, 07:39 UTCJun 28, 03:45 UTC20h 5m
2026-06-27 CQH8666 - Jun 27, 04:05 UTCJun 28, 03:45 UTC23h 40m
2026-06-27 CQH8666 - Jun 27, 03:20 UTCJun 27, 09:40 UTC6h 20m
2026-06-26 CQH8665 - Jun 26, 07:05 UTCJun 27, 05:39 UTC22h 35m
2026-06-25 CQH6786 - Jun 25, 18:34 UTCJun 25, 18:55 UTC20m
2026-06-25 CQH6785 - Jun 25, 02:30 UTCJun 25, 02:49 UTC20m
2026-06-24 CQH7555 SHA → SZX Jun 24, 17:25 UTCJun 24, 17:34 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-328J page for operator, model, and routing details .

Mode-S 781D40 frequently asked

What is Mode-S code 781D40?
781D40 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-328J.
Where is Mode-S 781D40 registered?
Mode-S code 781D40 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781D40 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781D40, octal 36016500, decimal 7,871,808.
What flights does 781D40 operate?
Mode-S 781D40 has broadcast 20 distinct callsigns, including CQH8666, CQH8665, CQH8597, CQH8598, CQH8952.