Apparatus

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sensors Mode-S transponder

781D3F

ICAO 24-bit transponder address · allocated to China

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

Hex
781D3F
Octal
36016477
Decimal
7,871,807
Country
CN
Tail
B-328H
Type
A20N
No current signal · last broadcast Jul 25, 04:15 UTC
Flights observed
115
Distinct callsigns
20
Country
CN
Last broadcast
Jul 25, 04:15 UTC

Last known position

Most recent position reported by Mode-S 781D3F.

Country allocation

The ICAO 24-bit address 781D3F 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
CQH6523 Spring Airlines 8 2026-05-20
CQH8521 - 7 2026-07-14
CQH8666 - 5 2026-07-09
CQH8597 Spring Airlines 5 2026-07-22
CQH6515 - 5 2026-07-16
CQH8875 Spring Airlines 4 2026-07-22
CQH7496 Spring Airlines 4 2026-06-04
CQH6524 Spring Airlines 4 2026-05-20
CQH6516 - 4 2026-07-16
CQH6293 - 4 2026-06-26
CQH8952 - 3 2026-07-02
CQH8663 - 3 2026-07-01
CQH7432 - 3 2026-07-20
CQH7420 Spring Airlines 3 2026-07-23
CQH7419 Spring Airlines 3 2026-07-24
CQH7286 Spring Airlines 3 2026-07-25
CQH8951 Spring Airlines 2 2026-05-17
CQH8920 Spring Airlines 2 2026-05-07
CQH8715 Spring Airlines 2 2026-05-30
CQH8598 Spring Airlines 2 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CQH7286 BKK → PVG Jul 25, 01:55 UTCJul 25, 04:15 UTC2h 20m
2026-07-24 CQH7419 CAN → BKK Jul 24, 22:50 UTCJul 25, 00:40 UTC1h 50m
2026-07-23 CQH7420 BKK → CAN Jul 23, 16:50 UTCJul 23, 18:30 UTC1h 40m
2026-07-23 CQH8876 MFM → PVG Jul 23, 03:40 UTCJul 23, 15:25 UTC11h 45m
2026-07-22 CQH8875 PVG → MFM Jul 22, 12:55 UTCJul 23, 02:05 UTC13h 10m
2026-07-22 CQH8597 PVG → HKG Jul 22, 03:55 UTCJul 22, 04:10 UTC15m
2026-07-20 CQH7432 DMK → NGB Jul 20, 07:50 UTCJul 21, 02:55 UTC19h 4m
2026-07-20 CQH7432 - Jul 20, 07:25 UTCJul 21, 02:55 UTC19h 29m
2026-07-20 CQH7431 NGB → BKK Jul 20, 05:50 UTCJul 20, 06:05 UTC15m
2026-07-19 CQH8936 CGQ → PVG Jul 19, 14:50 UTCJul 20, 04:00 UTC13h 10m
2026-07-18 CQH6334 - Jul 18, 04:40 UTCJul 18, 12:40 UTC8h 0m
2026-07-17 CQH7606 JHG → PVG Jul 17, 14:24 UTCJul 17, 14:35 UTC10m
2026-07-16 CQH6516 - Jul 16, 16:05 UTCJul 16, 20:19 UTC4h 15m
2026-07-16 CQH6515 - Jul 16, 05:10 UTCJul 16, 13:54 UTC8h 45m
2026-07-15 CQH6334 - Jul 15, 06:15 UTCJul 16, 05:45 UTC23h 30m
2026-07-14 CQH8521 - Jul 14, 12:35 UTCJul 15, 06:20 UTC17h 44m
2026-07-14 CQH8521 - Jul 14, 06:45 UTCJul 15, 05:45 UTC22h 59m
2026-07-14 CQH8521 - Jul 14, 02:15 UTCJul 14, 20:00 UTC17h 45m
2026-07-13 CQH6900 - Jul 13, 13:25 UTCJul 14, 06:55 UTC17h 30m
2026-07-13 CQH6899 - Jul 13, 11:35 UTCJul 13, 11:55 UTC20m
2026-07-12 CQH8521 - Jul 12, 12:40 UTCJul 13, 06:35 UTC17h 55m
2026-07-09 CQH8666 - Jul 9, 20:05 UTCJul 10, 12:55 UTC16h 50m
2026-07-09 CQH8593 - Jul 9, 03:20 UTCJul 9, 18:50 UTC15h 30m
2026-07-07 CQH6516 - Jul 7, 15:55 UTCJul 7, 20:20 UTC4h 25m
2026-07-07 CQH6515 - Jul 7, 09:50 UTCJul 7, 13:55 UTC4h 5m
2026-07-02 CQH8952 - Jul 2, 03:35 UTCJul 2, 04:05 UTC30m
2026-07-01 CQH8663 - Jul 1, 07:50 UTCJul 2, 02:20 UTC18h 30m
2026-07-01 CQH8663 - Jul 1, 06:55 UTCJul 2, 02:20 UTC19h 25m
2026-06-30 CQH8663 - Jun 30, 14:30 UTCJul 1, 13:40 UTC23h 10m
2026-06-30 CQH7049 - Jun 30, 03:35 UTCJun 30, 13:25 UTC9h 50m
2026-06-29 CQH7057 - Jun 29, 11:50 UTCJun 30, 08:25 UTC20h 36m
2026-06-29 CQH8666 - Jun 29, 09:50 UTCJun 30, 08:25 UTC22h 36m
2026-06-29 CQH8666 - Jun 29, 09:14 UTCJun 30, 03:55 UTC18h 41m
2026-06-29 CQH8666 - Jun 29, 05:50 UTCJun 30, 03:55 UTC22h 6m
2026-06-29 CQH8666 - Jun 29, 03:49 UTCJun 30, 03:45 UTC23h 56m
2026-06-26 CQH6294 - Jun 26, 19:55 UTCJun 26, 20:24 UTC30m
2026-06-26 CQH6293 - Jun 26, 16:24 UTCJun 26, 17:19 UTC55m
2026-06-06 CQH6538 FUK → PVG Jun 6, 09:00 UTCJun 6, 09:09 UTC10m
2026-06-06 CQH8806 - Jun 6, 03:20 UTCJun 6, 03:55 UTC35m
2026-06-05 CQH7286 BKK → PVG Jun 5, 01:50 UTCJun 5, 13:10 UTC11h 20m
2026-06-04 CQH7419 CAN → BKK Jun 4, 22:20 UTCJun 5, 00:35 UTC2h 15m
2026-06-04 CQH7496 SIN → CAN Jun 4, 16:30 UTCJun 4, 17:05 UTC35m
2026-06-04 CQH7496 SIN → CAN Jun 4, 13:25 UTCJun 4, 13:50 UTC25m
2026-06-04 CQH7495 CAN → SIN Jun 4, 11:35 UTCJun 4, 11:50 UTC15m
2026-06-03 CQH7348 SGN → CAN Jun 3, 13:55 UTCJun 3, 14:20 UTC25m
2026-06-03 CQH7347 CAN → SGN Jun 3, 08:40 UTCJun 3, 08:50 UTC10m
2026-06-03 CQH6922 KUL → CAN Jun 3, 05:40 UTCJun 3, 06:00 UTC20m
2026-06-03 CQH6922 KUL → CAN Jun 3, 02:35 UTCJun 3, 02:55 UTC20m
2026-06-03 CQH6921 CAN → KUL Jun 3, 00:45 UTCJun 3, 01:10 UTC25m
2026-06-02 CQH7420 BKK → CAN Jun 2, 14:40 UTCJun 2, 16:20 UTC1h 40m

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-328H page for operator, model, and routing details .

Mode-S 781D3F frequently asked

What is Mode-S code 781D3F?
781D3F is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-328H.
Where is Mode-S 781D3F registered?
Mode-S code 781D3F is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781D3F broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 04:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781D3F, octal 36016477, decimal 7,871,807.
What flights does 781D3F operate?
Mode-S 781D3F has broadcast 20 distinct callsigns, including CQH6523, CQH8521, CQH8666, CQH8597, CQH6515.