Apparatus

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sensors Mode-S transponder

781D68

ICAO 24-bit transponder address · allocated to China

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

Hex
781D68
Octal
36016550
Decimal
7,871,848
Country
CN
Tail
B-328U
Type
A20N
No current signal · last broadcast 16h ago
Flights observed
6
Distinct callsigns
3
Country
CN
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S 781D68.

Country allocation

The ICAO 24-bit address 781D68 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 3 distinct

Callsign Airline Flights Last seen
CQH6516 Spring Airlines 3 2026-04-13
CQH6515 - 2 2026-04-13
CQH6246 Spring Airlines 1 2026-04-14

Recent flights last 6

DateFlightRouteTakeoffLandingDuration
2026-04-14 CQH6246 OKA → PVG Apr 14, 06:20 UTCApr 14, 06:35 UTC15m
2026-04-13 CQH6516 KUL → PVG Apr 13, 19:45 UTCApr 13, 20:30 UTC45m
2026-04-13 CQH6516 KUL → PVG Apr 13, 19:35 UTCApr 13, 19:50 UTC15m
2026-04-13 CQH6516 KUL → PVG Apr 13, 16:30 UTCApr 13, 16:45 UTC15m
2026-04-13 CQH6515 - Apr 13, 14:00 UTCApr 13, 14:20 UTC20m
2026-04-13 CQH6515 - Apr 13, 09:50 UTCApr 13, 10:30 UTC40m

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

Mode-S 781D68 frequently asked

What is Mode-S code 781D68?
781D68 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-328U.
Where is Mode-S 781D68 registered?
Mode-S code 781D68 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781D68 broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781D68, octal 36016550, decimal 7,871,848.
What flights does 781D68 operate?
Mode-S 781D68 has broadcast 3 distinct callsigns, including CQH6516, CQH6515, CQH6246.