Apparatus

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sensors Mode-S transponder

781639

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-306Z · AIRBUS A-320neo

Hex
781639
Octal
36013071
Decimal
7,870,009
Country
CN
Tail
B-306Z
Type
A20N
No current signal · last broadcast Jul 26, 10:10 UTC
Flights observed
107
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 10:10 UTC

Last known position

Most recent position reported by Mode-S 781639.

Country allocation

The ICAO 24-bit address 781639 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
CQH8521 - 11 2026-07-16
CQH6293 - 8 2026-07-01
CQH6294 - 7 2026-07-01
CQH8522 - 6 2026-07-15
CQH8666 - 4 2026-07-05
CQH6826 - 4 2026-05-30
CQH8876 - 3 2026-07-17
CQH8598 Spring Airlines 3 2026-06-06
CQH6987 - 3 2026-05-22
CQH6516 Spring Airlines 3 2026-04-19
CQH8875 Spring Airlines 2 2026-05-14
CQH8756 Spring Airlines 2 2026-05-25
CQH8755 Spring Airlines 2 2026-05-25
CQH8715 Spring Airlines 2 2026-05-02
CQH7431 - 2 2026-06-15
CQH6988 - 2 2026-05-22
CQH6907 Spring Airlines 2 2026-05-03
CQH6825 - 2 2026-05-30
CQH6524 - 2 2026-07-08
CQH6523 - 2 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CQH6411 CGO → CGQ Jul 26, 09:50 UTCJul 26, 10:10 UTC20m
2026-07-23 CQH6411 CGO → CGQ Jul 23, 10:00 UTCJul 23, 10:10 UTC10m
2026-07-19 CQH7135 LHW → TSN Jul 19, 04:10 UTCJul 19, 04:30 UTC20m
2026-07-18 CQH8664 HKT → PVG Jul 18, 11:50 UTCJul 18, 14:35 UTC2h 45m
2026-07-18 CQH8663 - Jul 18, 07:10 UTCJul 18, 09:55 UTC2h 45m
2026-07-17 CQH8876 - Jul 17, 04:44 UTCJul 17, 06:00 UTC1h 15m
2026-07-16 CQH8521 - Jul 16, 12:25 UTCJul 17, 02:54 UTC14h 30m
2026-07-16 CQH8521 - Jul 16, 06:35 UTCJul 17, 02:54 UTC20h 20m
2026-07-16 CQH8521 - Jul 16, 02:20 UTCJul 17, 02:15 UTC23h 55m
2026-07-16 CQH8521 - Jul 16, 02:05 UTCJul 16, 19:55 UTC17h 50m
2026-07-15 CQH8521 - Jul 15, 19:25 UTCJul 16, 17:54 UTC22h 30m
2026-07-15 CQH8521 - Jul 15, 17:25 UTCJul 16, 15:00 UTC21h 35m
2026-07-15 CQH8522 - Jul 15, 15:00 UTCJul 16, 12:40 UTC21h 40m
2026-07-15 CQH8522 - Jul 15, 13:10 UTCJul 16, 06:45 UTC17h 35m
2026-07-15 CQH8522 - Jul 15, 00:10 UTCJul 15, 20:05 UTC19h 55m
2026-07-14 CQH8560 - Jul 14, 08:10 UTCJul 14, 08:35 UTC25m
2026-07-14 CQH8559 - Jul 14, 06:00 UTCJul 14, 06:45 UTC45m
2026-07-08 CQH6524 - Jul 8, 14:10 UTCJul 8, 15:25 UTC1h 15m
2026-07-08 CQH6524 - Jul 8, 11:05 UTCJul 8, 11:20 UTC15m
2026-07-08 CQH6523 - Jul 8, 09:05 UTCJul 8, 09:25 UTC20m
2026-07-08 CQH6523 - Jul 8, 05:05 UTCJul 8, 05:55 UTC50m
2026-07-06 CQH8521 PVG → HKT Jul 6, 01:40 UTCJul 6, 19:45 UTC18h 5m
2026-07-05 CQH8666 - Jul 5, 10:20 UTCJul 6, 06:50 UTC20h 30m
2026-07-05 CQH8666 - Jul 5, 09:25 UTCJul 6, 06:50 UTC21h 25m
2026-07-05 CQH8666 - Jul 5, 06:20 UTCJul 6, 02:00 UTC19h 40m
2026-07-05 CQH8666 - Jul 5, 05:10 UTCJul 6, 02:00 UTC20h 50m
2026-07-05 CQH8665 - Jul 5, 03:45 UTCJul 6, 02:00 UTC22h 15m
2026-07-04 CQH8878 - Jul 4, 05:10 UTCJul 5, 04:05 UTC22h 55m
2026-07-04 CQH8877 - Jul 4, 02:35 UTCJul 4, 03:35 UTC1h 0m
2026-07-01 CQH6294 - Jul 1, 21:15 UTCJul 1, 21:25 UTC10m
2026-07-01 CQH6293 - Jul 1, 17:10 UTCJul 1, 17:25 UTC15m
2026-07-01 CQH6293 - Jul 1, 16:05 UTCJul 1, 16:30 UTC25m
2026-06-30 CQH7502 - Jun 30, 04:25 UTCJun 30, 10:20 UTC5h 55m
2026-06-30 CQH7501 - Jun 30, 01:09 UTCJun 30, 02:45 UTC1h 36m
2026-06-28 CQH6880 - Jun 28, 15:24 UTCJun 28, 16:49 UTC1h 25m
2026-06-28 CQH6879 - Jun 28, 12:25 UTCJun 28, 13:45 UTC1h 20m
2026-06-23 CQH6294 - Jun 23, 20:04 UTCJun 23, 20:54 UTC50m
2026-06-23 CQH6293 - Jun 23, 16:59 UTCJun 23, 17:20 UTC20m
2026-06-22 CQH6342 - Jun 22, 04:00 UTCJun 22, 14:40 UTC10h 40m
2026-06-20 CQH7260 PEN → PVG Jun 20, 07:39 UTCJun 20, 11:40 UTC4h 0m
2026-06-20 CQH7259 PVG → PEN Jun 20, 05:34 UTCJun 20, 05:44 UTC10m
2026-06-19 CQH8522 - Jun 19, 12:29 UTCJun 20, 01:55 UTC13h 25m
2026-06-16 CQH7432 - Jun 16, 07:20 UTCJun 16, 08:44 UTC1h 25m
2026-06-15 CQH7431 - Jun 15, 11:39 UTCJun 16, 05:40 UTC18h 0m
2026-06-15 CQH7431 - Jun 15, 05:40 UTCJun 16, 04:15 UTC22h 35m
2026-06-10 CQH6294 BKK → XIY Jun 10, 20:05 UTCJun 10, 20:30 UTC25m
2026-06-10 CQH6293 XIY → BKK Jun 10, 17:10 UTCJun 10, 17:35 UTC25m
2026-06-08 CQH6341 SHE → HFE Jun 8, 03:45 UTCJun 8, 03:55 UTC10m
2026-06-07 CQH6610 FUK → PVG Jun 7, 03:15 UTCJun 7, 03:25 UTC10m
2026-06-06 CQH8598 HKG → PVG Jun 6, 08:45 UTCJun 6, 12:10 UTC3h 25m

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-306Z page for operator, model, and routing details .

Mode-S 781639 frequently asked

What is Mode-S code 781639?
781639 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-306Z.
Where is Mode-S 781639 registered?
Mode-S code 781639 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781639 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 10:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781639, octal 36013071, decimal 7,870,009.
What flights does 781639 operate?
Mode-S 781639 has broadcast 20 distinct callsigns, including CQH8521, CQH6293, CQH6294, CQH8522, CQH8666.