sensors Mode-S transponder
781B7D
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-323N · AIRBUS A-321neo
- Hex
- 781B7D
- Octal
- 36015575
- Decimal
- 7,871,357
- Country
- CN
- Tail
- B-323N
- Type
- A21N
- Flights observed
- 41
- Distinct callsigns
- 19
- Country
- CN
- Last broadcast
- 18h ago
Last known position
Country allocation
The ICAO 24-bit address 781B7D 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 19 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CQH8775 | Spring Airlines | 4 | 2026-05-04 |
| CQH6566 | Spring Airlines | 4 | 2026-06-02 |
| CQH8949 | Spring Airlines | 3 | 2026-05-22 |
| CQH6576 | Spring Airlines | 3 | 2026-05-16 |
| CQH6575 | Spring Airlines | 3 | 2026-05-15 |
| CQH6565 | Spring Airlines | 3 | 2026-06-02 |
| CQH8956 | Spring Airlines | 2 | 2026-04-28 |
| CQH8955 | Spring Airlines | 2 | 2026-04-28 |
| CQH8950 | Spring Airlines | 2 | 2026-05-13 |
| CQH8882 | Spring Airlines | 2 | 2026-04-29 |
| CQH8836 | Spring Airlines | 2 | 2026-05-25 |
| CQH8776 | Spring Airlines | 2 | 2026-04-21 |
| CQH6582 | Spring Airlines | 2 | 2026-04-26 |
| CQH8931 | Spring Airlines | 1 | 2026-04-20 |
| CQH8918 | Spring Airlines | 1 | 2026-04-17 |
| CQH8917 | Spring Airlines | 1 | 2026-04-17 |
| CQH8881 | Spring Airlines | 1 | 2026-04-29 |
| CQH6581 | Spring Airlines | 1 | 2026-05-14 |
| CQH6223 | - | 1 | 2026-05-05 |
Recent flights last 41
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-02 | CQH6566 | KIX → PVG | Jun 2, 07:30 UTC | Jun 2, 08:15 UTC | 45m |
| 2026-06-02 | CQH6565 | PVG → KIX | Jun 2, 03:55 UTC | Jun 2, 04:40 UTC | 45m |
| 2026-05-25 | CQH8836 | CAN → SHA | May 25, 03:20 UTC | May 25, 03:30 UTC | 10m |
| 2026-05-22 | CQH8949 | SHA → SZX | May 22, 13:05 UTC | May 22, 13:20 UTC | 15m |
| 2026-05-17 | CQH6566 | KIX → PVG | May 17, 06:05 UTC | May 17, 10:55 UTC | 4h 50m |
| 2026-05-16 | CQH6565 | PVG → KIX | May 16, 10:46 UTC | May 17, 04:40 UTC | 17h 55m |
| 2026-05-16 | CQH6576 | KIX → PVG | May 16, 03:25 UTC | May 16, 09:40 UTC | 6h 16m |
| 2026-05-15 | CQH6575 | PVG → KIX | May 15, 12:15 UTC | May 16, 02:05 UTC | 13h 49m |
| 2026-05-14 | CQH6581 | PVG → KIX | May 14, 23:55 UTC | May 15, 10:55 UTC | 11h 0m |
| 2026-05-13 | CQH8950 | SZX → SHA | May 13, 13:20 UTC | May 13, 14:00 UTC | 40m |
| 2026-05-13 | CQH8949 | SHA → SZX | May 13, 11:45 UTC | May 13, 11:55 UTC | 10m |
| 2026-05-05 | CQH6223 | - | May 5, 06:30 UTC | May 5, 10:45 UTC | 4h 15m |
| 2026-05-04 | CQH8775 | SHA → SZX | May 4, 08:15 UTC | May 4, 08:40 UTC | 25m |
| 2026-05-03 | CQH8950 | SZX → SHA | May 3, 15:05 UTC | May 3, 15:15 UTC | 10m |
| 2026-05-03 | CQH8949 | SHA → SZX | May 3, 13:25 UTC | May 3, 13:45 UTC | 20m |
| 2026-04-29 | CQH8882 | SZX → SHA | Apr 29, 08:25 UTC | Apr 29, 08:34 UTC | 10m |
| 2026-04-29 | CQH8881 | SHA → SZX | Apr 29, 06:00 UTC | Apr 29, 06:10 UTC | 10m |
| 2026-04-28 | CQH8956 | SZX → SHA | Apr 28, 23:40 UTC | Apr 28, 23:54 UTC | 15m |
| 2026-04-28 | CQH8955 | SHA → SZX | Apr 28, 21:30 UTC | Apr 28, 21:45 UTC | 15m |
| 2026-04-28 | CQH8775 | SHA → SZX | Apr 28, 09:10 UTC | Apr 28, 09:25 UTC | 15m |
| 2026-04-26 | CQH6582 | KIX → PVG | Apr 26, 11:20 UTC | Apr 26, 12:05 UTC | 45m |
| 2026-04-26 | CQH6576 | KIX → PVG | Apr 26, 03:30 UTC | Apr 26, 08:50 UTC | 5h 20m |
| 2026-04-26 | CQH6575 | PVG → KIX | Apr 26, 01:15 UTC | Apr 26, 01:40 UTC | 25m |
| 2026-04-25 | CQH6566 | KIX → PVG | Apr 25, 06:15 UTC | Apr 26, 01:40 UTC | 19h 25m |
| 2026-04-24 | CQH6582 | KIX → PVG | Apr 24, 10:40 UTC | Apr 25, 04:45 UTC | 18h 5m |
| 2026-04-24 | CQH6576 | KIX → PVG | Apr 24, 03:25 UTC | Apr 24, 08:50 UTC | 5h 25m |
| 2026-04-24 | CQH6575 | PVG → KIX | Apr 24, 01:25 UTC | Apr 24, 01:50 UTC | 25m |
| 2026-04-23 | CQH6566 | KIX → PVG | Apr 23, 06:10 UTC | Apr 24, 01:50 UTC | 19h 39m |
| 2026-04-23 | CQH6565 | PVG → KIX | Apr 23, 03:50 UTC | Apr 23, 04:15 UTC | 25m |
| 2026-04-21 | CQH8776 | SZX → SHA | Apr 21, 10:05 UTC | Apr 21, 10:15 UTC | 10m |
| 2026-04-21 | CQH8775 | SHA → SZX | Apr 21, 08:15 UTC | Apr 21, 08:30 UTC | 15m |
| 2026-04-21 | CQH8836 | CAN → SHA | Apr 21, 03:15 UTC | Apr 21, 03:25 UTC | 10m |
| 2026-04-20 | CQH8931 | SHA → CAN | Apr 20, 13:45 UTC | Apr 20, 14:00 UTC | 15m |
| 2026-04-20 | CQH8882 | SZX → SHA | Apr 20, 08:30 UTC | Apr 20, 08:45 UTC | 15m |
| 2026-04-19 | CQH8956 | SZX → SHA | Apr 19, 23:45 UTC | Apr 19, 23:55 UTC | 10m |
| 2026-04-19 | CQH8955 | SHA → SZX | Apr 19, 15:50 UTC | Apr 19, 16:00 UTC | 10m |
| 2026-04-19 | CQH8776 | SZX → SHA | Apr 19, 10:10 UTC | Apr 19, 10:20 UTC | 10m |
| 2026-04-19 | CQH8775 | SHA → SZX | Apr 19, 08:25 UTC | Apr 19, 08:50 UTC | 25m |
| 2026-04-19 | - | - | Apr 19, 01:00 UTC | Apr 19, 01:15 UTC | 15m |
| 2026-04-17 | CQH8918 | SZX → SHA | Apr 17, 02:40 UTC | Apr 17, 02:50 UTC | 10m |
| 2026-04-17 | CQH8917 | SHA → SZX | Apr 17, 00:35 UTC | Apr 17, 01:00 UTC | 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-323N page for operator, model, and routing details .