Apparatus

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sensors Mode-S transponder

781DBD

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-329U · AIRBUS A-320neo

Hex
781DBD
Octal
36016675
Decimal
7,871,933
Country
CN
Tail
B-329U
Type
A20N
No current signal · last broadcast Jul 26, 08:50 UTC
Flights observed
90
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 08:50 UTC

Last known position

Most recent position reported by Mode-S 781DBD.

Country allocation

The ICAO 24-bit address 781DBD 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
CQH7135 Spring Airlines 5 2026-07-25
CQH6515 - 4 2026-07-14
CQH6987 - 3 2026-06-07
CQH8663 - 2 2026-07-10
CQH8560 Spring Airlines 2 2026-07-26
CQH8559 Spring Airlines 2 2026-07-26
CQH7679 Spring Airlines 2 2026-06-07
CQH7556 Spring Airlines 2 2026-06-09
CQH7555 Spring Airlines 2 2026-05-26
CQH7286 Spring Airlines 2 2026-04-17
CQH7281 - 2 2026-07-12
CQH7136 Spring Airlines 2 2026-07-25
CQH6988 - 2 2026-06-07
CQH6836 Spring Airlines 2 2026-05-19
CQH6628 - 2 2026-07-17
CQH6627 Spring Airlines 2 2026-07-17
CQH6465 - 2 2026-07-01
CQH8952 Spring Airlines 1 2026-06-02
CQH8951 Spring Airlines 1 2026-06-02
CQH8936 Spring Airlines 1 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CQH8560 ICN → PVG Jul 26, 08:05 UTCJul 26, 08:50 UTC45m
2026-07-26 CQH8559 PVG → ICN Jul 26, 05:55 UTCJul 26, 06:40 UTC46m
2026-07-25 CQH7136 TSN → LHW Jul 25, 03:20 UTCJul 25, 03:45 UTC25m
2026-07-25 CQH7135 LHW → TSN Jul 25, 01:05 UTCJul 25, 01:30 UTC25m
2026-07-24 CQH7136 TSN → LHW Jul 24, 06:35 UTCJul 24, 06:55 UTC20m
2026-07-24 CQH7135 LHW → TSN Jul 24, 04:15 UTCJul 24, 04:40 UTC25m
2026-07-23 CQH7387 - Jul 23, 23:35 UTCJul 23, 23:45 UTC10m
2026-07-23 CQH6730 - Jul 23, 02:15 UTCJul 23, 02:40 UTC25m
2026-07-22 CQH6729 - Jul 22, 23:35 UTCJul 23, 00:00 UTC25m
2026-07-22 CQH7388 - Jul 22, 14:30 UTCJul 22, 14:55 UTC25m
2026-07-22 CQH7135 LHW → TSN Jul 22, 04:15 UTCJul 22, 04:55 UTC40m
2026-07-19 CQH8560 - Jul 19, 08:10 UTCJul 19, 08:45 UTC35m
2026-07-19 CQH8559 PVG → ICN Jul 19, 06:00 UTCJul 19, 06:35 UTC35m
2026-07-17 CQH6628 - Jul 17, 14:15 UTCJul 18, 03:10 UTC12h 56m
2026-07-17 CQH6627 XIY → CNX Jul 17, 12:10 UTCJul 17, 12:55 UTC45m
2026-07-14 CQH6516 - Jul 14, 16:00 UTCJul 15, 05:20 UTC13h 19m
2026-07-14 CQH6515 - Jul 14, 14:05 UTCJul 14, 14:25 UTC20m
2026-07-13 CQH6515 - Jul 13, 18:25 UTCJul 14, 11:20 UTC16h 55m
2026-07-13 CQH6515 - Jul 13, 15:40 UTCJul 14, 11:20 UTC19h 40m
2026-07-13 CQH6515 - Jul 13, 13:55 UTCJul 14, 11:20 UTC21h 25m
2026-07-13 CQH8522 - Jul 13, 09:20 UTCJul 13, 20:45 UTC11h 25m
2026-07-12 CQH6537 - Jul 12, 13:45 UTCJul 13, 07:45 UTC18h 0m
2026-07-12 CQH7282 - Jul 12, 11:40 UTCJul 12, 11:55 UTC15m
2026-07-12 CQH7281 - Jul 12, 09:45 UTCJul 12, 10:01 UTC15m
2026-07-12 CQH7281 - Jul 12, 07:50 UTCJul 12, 08:05 UTC15m
2026-07-10 CQH8664 - Jul 10, 13:25 UTCJul 11, 06:45 UTC17h 20m
2026-07-10 CQH8663 - Jul 10, 10:10 UTCJul 11, 06:45 UTC20h 36m
2026-07-10 CQH8663 - Jul 10, 08:35 UTCJul 11, 06:45 UTC22h 10m
2026-07-08 CQH7278 - Jul 8, 06:55 UTCJul 8, 07:05 UTC10m
2026-07-08 CQH7277 - Jul 8, 02:45 UTCJul 8, 03:00 UTC15m
2026-07-04 CQH7020 - Jul 4, 03:10 UTCJul 4, 03:20 UTC10m
2026-07-03 CQH8687 - Jul 3, 22:20 UTCJul 3, 22:35 UTC15m
2026-07-03 CQH8782 - Jul 3, 18:55 UTCJul 3, 19:10 UTC15m
2026-07-03 CQH7653 - Jul 3, 12:40 UTCJul 3, 18:10 UTC5h 30m
2026-07-01 CQH6466 - Jul 1, 08:25 UTCJul 1, 10:10 UTC1h 45m
2026-07-01 CQH6465 - Jul 1, 06:40 UTCJul 1, 07:05 UTC25m
2026-07-01 CQH6465 - Jul 1, 05:20 UTCJul 1, 05:55 UTC35m
2026-06-29 CQH7519 - Jun 29, 03:34 UTCJun 29, 03:54 UTC20m
2026-06-22 CQH6524 - Jun 22, 10:49 UTCJun 22, 14:59 UTC4h 10m
2026-06-22 CQH6523 - Jun 22, 04:44 UTCJun 22, 09:10 UTC4h 25m
2026-06-15 CQH8920 - Jun 15, 09:35 UTCJun 15, 10:15 UTC40m
2026-06-10 CQH7520 SZX → SHA Jun 10, 06:05 UTCJun 10, 06:20 UTC15m
2026-06-09 CQH7556 SZX → SHA Jun 9, 22:10 UTCJun 9, 22:20 UTC10m
2026-06-08 CQH7355 SZX → LHW Jun 8, 22:55 UTCJun 8, 23:05 UTC10m
2026-06-08 CQH7680 LHW → SZX Jun 8, 19:50 UTCJun 8, 20:00 UTC10m
2026-06-07 CQH7679 SZX → LHW Jun 7, 22:30 UTCJun 7, 22:40 UTC10m
2026-06-07 CQH6988 - Jun 7, 07:55 UTCJun 7, 09:40 UTC1h 45m
2026-06-07 CQH6987 - Jun 7, 04:45 UTCJun 7, 06:10 UTC1h 25m
2026-06-05 CQH6988 - Jun 5, 07:35 UTCJun 5, 09:15 UTC1h 40m
2026-06-05 CQH6987 - Jun 5, 04:45 UTCJun 5, 06:05 UTC1h 20m

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-329U page for operator, model, and routing details .

Mode-S 781DBD frequently asked

What is Mode-S code 781DBD?
781DBD is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-329U.
Where is Mode-S 781DBD registered?
Mode-S code 781DBD is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781DBD broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 08:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781DBD, octal 36016675, decimal 7,871,933.
What flights does 781DBD operate?
Mode-S 781DBD has broadcast 20 distinct callsigns, including CQH7135, CQH6515, CQH6987, CQH8663, CQH8560.