Apparatus

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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 Jul 25, 14:40 UTC
Flights observed
120
Distinct callsigns
20
Country
CN
Last broadcast
Jul 25, 14:40 UTC

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
CQH8859 Spring Airlines 3 2026-07-22
CQH8521 Spring Airlines 3 2026-07-21
CQH7281 - 3 2026-07-13
CQH8891 - 2 2026-07-15
CQH8792 - 2 2026-07-14
CQH8779 Spring Airlines 2 2026-04-22
CQH8687 - 2 2026-07-24
CQH8522 Spring Airlines 2 2026-07-22
CQH8516 Spring Airlines 2 2026-06-04
CQH8515 Spring Airlines 2 2026-06-04
CQH8512 Spring Airlines 2 2026-07-19
CQH7341 - 2 2026-06-20
CQH6988 - 2 2026-06-19
CQH6987 - 2 2026-06-19
CQH6826 - 2 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 - - Jul 25, 14:10 UTCJul 25, 14:40 UTC30m
2026-07-25 CQH7020 - Jul 25, 03:20 UTCJul 25, 03:30 UTC10m
2026-07-24 CQH8687 - Jul 24, 22:00 UTCJul 24, 22:10 UTC10m
2026-07-24 CQH6786 WUH → SZX Jul 24, 13:45 UTCJul 24, 14:00 UTC15m
2026-07-24 CQH6785 WUH → WUA Jul 24, 02:15 UTCJul 24, 02:30 UTC15m
2026-07-23 CQH6727 SZX → NNY Jul 23, 10:50 UTCJul 23, 11:00 UTC10m
2026-07-22 CQH8859 PVG → HRB Jul 22, 16:45 UTCJul 23, 00:40 UTC7h 55m
2026-07-22 CQH8859 PVG → HRB Jul 22, 05:20 UTCJul 23, 00:40 UTC19h 20m
2026-07-22 CQH8522 HKT → PVG Jul 22, 02:45 UTCJul 23, 00:40 UTC21h 55m
2026-07-21 CQH8521 PVG → HKT Jul 21, 22:05 UTCJul 22, 16:50 UTC18h 45m
2026-07-21 CQH8521 PVG → HKT Jul 21, 21:55 UTCJul 22, 16:50 UTC18h 55m
2026-07-19 CQH8512 CNX → PVG Jul 19, 01:45 UTCJul 19, 12:50 UTC11h 5m
2026-07-18 CQH8933 CAN → CNX Jul 18, 11:15 UTCJul 19, 00:30 UTC13h 15m
2026-07-18 CQH8789 - Jul 18, 09:10 UTCJul 18, 09:40 UTC30m
2026-07-18 CQH8662 - Jul 18, 06:20 UTCJul 18, 06:30 UTC10m
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

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 Jul 25, 14:40 UTC.
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.