sensors Mode-S transponder
781A9B
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-321F · AIRBUS A-321neo
- Hex
- 781A9B
- Octal
- 36015233
- Decimal
- 7,871,131
- Country
- CN
- Tail
- B-321F
- Type
- A21N
- Flights observed
- 64
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 2h ago
Last known position
Country allocation
The ICAO 24-bit address 781A9B 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 |
|---|---|---|---|
| CQH6576 | Spring Airlines | 10 | 2026-05-10 |
| CQH6582 | Spring Airlines | 9 | 2026-05-09 |
| CQH6566 | Spring Airlines | 8 | 2026-05-26 |
| CQH6575 | Spring Airlines | 7 | 2026-05-09 |
| CQH6565 | Spring Airlines | 7 | 2026-05-26 |
| CQH8950 | Spring Airlines | 3 | 2026-05-19 |
| CQH8949 | Spring Airlines | 3 | 2026-05-19 |
| CQH7519 | Spring Airlines | 3 | 2026-04-20 |
| CQH7520 | Spring Airlines | 2 | 2026-04-20 |
| CQH8956 | Spring Airlines | 1 | 2026-05-22 |
| CQH8955 | Spring Airlines | 1 | 2026-05-22 |
| CQH8918 | Spring Airlines | 1 | 2026-05-24 |
| CQH8917 | Spring Airlines | 1 | 2026-05-24 |
| CQH8882 | Spring Airlines | 1 | 2026-05-23 |
| CQH8881 | Spring Airlines | 1 | 2026-05-23 |
| CQH8835 | Spring Airlines | 1 | 2026-05-30 |
| CQH8816 | - | 1 | 2026-04-23 |
| CQH8776 | Spring Airlines | 1 | 2026-05-30 |
| CQH8775 | Spring Airlines | 1 | 2026-05-30 |
| CQH6720 | Spring Airlines | 1 | 2026-05-18 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | CQH8776 | SZX → SHA | May 30, 10:05 UTC | May 30, 10:30 UTC | 25m |
| 2026-05-30 | CQH8775 | SHA → SZX | May 30, 08:10 UTC | May 30, 08:25 UTC | 15m |
| 2026-05-30 | CQH8835 | SHA → CAN | May 30, 01:10 UTC | May 30, 01:20 UTC | 10m |
| 2026-05-29 | - | - | May 29, 09:25 UTC | May 29, 09:35 UTC | 10m |
| 2026-05-26 | CQH6566 | KIX → PVG | May 26, 06:44 UTC | May 26, 11:50 UTC | 5h 5m |
| 2026-05-26 | CQH6565 | PVG → KIX | May 26, 04:45 UTC | May 26, 05:40 UTC | 55m |
| 2026-05-24 | CQH8918 | SZX → SHA | May 24, 03:00 UTC | May 24, 03:10 UTC | 10m |
| 2026-05-24 | CQH8917 | SHA → SZX | May 24, 00:40 UTC | May 24, 00:55 UTC | 15m |
| 2026-05-23 | CQH8882 | SZX → SHA | May 23, 06:25 UTC | May 23, 06:35 UTC | 10m |
| 2026-05-23 | CQH8881 | SHA → SZX | May 23, 04:15 UTC | May 23, 04:55 UTC | 40m |
| 2026-05-22 | CQH8956 | SZX → SHA | May 22, 23:30 UTC | May 22, 23:40 UTC | 10m |
| 2026-05-22 | CQH8955 | SHA → SZX | May 22, 17:45 UTC | May 22, 18:05 UTC | 20m |
| 2026-05-19 | CQH8950 | SZX → SHA | May 19, 13:40 UTC | May 19, 13:50 UTC | 10m |
| 2026-05-19 | CQH8949 | SHA → SZX | May 19, 12:10 UTC | May 19, 12:20 UTC | 10m |
| 2026-05-18 | CQH6720 | CAN → SHA | May 18, 11:15 UTC | May 18, 11:50 UTC | 35m |
| 2026-05-11 | CQH6566 | KIX → PVG | May 11, 06:00 UTC | May 11, 10:45 UTC | 4h 45m |
| 2026-05-10 | CQH6565 | PVG → KIX | May 10, 10:35 UTC | May 11, 04:20 UTC | 17h 45m |
| 2026-05-10 | CQH6576 | KIX → PVG | May 10, 03:50 UTC | May 10, 09:24 UTC | 5h 35m |
| 2026-05-09 | CQH6582 | KIX → PVG | May 9, 10:30 UTC | May 10, 02:30 UTC | 16h 0m |
| 2026-05-09 | CQH6576 | KIX → PVG | May 9, 03:30 UTC | May 9, 09:05 UTC | 5h 35m |
| 2026-05-09 | CQH6575 | PVG → KIX | May 9, 01:20 UTC | May 9, 02:05 UTC | 45m |
| 2026-05-08 | CQH6582 | KIX → PVG | May 8, 10:54 UTC | May 8, 11:44 UTC | 50m |
| 2026-05-08 | CQH6576 | KIX → PVG | May 8, 03:30 UTC | May 8, 09:04 UTC | 5h 35m |
| 2026-05-07 | CQH6575 | PVG → KIX | May 7, 06:50 UTC | May 8, 02:14 UTC | 19h 25m |
| 2026-05-07 | CQH6575 | PVG → KIX | May 7, 06:10 UTC | May 8, 02:14 UTC | 20h 5m |
| 2026-05-06 | CQH6582 | KIX → PVG | May 6, 10:35 UTC | May 7, 04:10 UTC | 17h 34m |
| 2026-05-06 | CQH6576 | KIX → PVG | May 6, 03:30 UTC | May 6, 08:55 UTC | 5h 25m |
| 2026-05-05 | CQH6582 | KIX → PVG | May 5, 10:40 UTC | May 6, 01:50 UTC | 15h 10m |
| 2026-05-05 | CQH6576 | KIX → PVG | May 5, 03:30 UTC | May 5, 08:45 UTC | 5h 15m |
| 2026-05-04 | CQH6582 | KIX → PVG | May 4, 10:40 UTC | May 5, 01:40 UTC | 15h 1m |
| 2026-05-04 | CQH6576 | KIX → PVG | May 4, 03:35 UTC | May 4, 09:10 UTC | 5h 35m |
| 2026-05-03 | CQH6575 | PVG → KIX | May 3, 06:50 UTC | May 4, 01:55 UTC | 19h 5m |
| 2026-05-03 | CQH6566 | KIX → PVG | May 3, 06:10 UTC | May 4, 01:55 UTC | 19h 45m |
| 2026-05-03 | CQH6565 | PVG → KIX | May 3, 03:50 UTC | May 3, 04:40 UTC | 50m |
| 2026-05-02 | CQH6565 | PVG → KIX | May 2, 06:50 UTC | May 3, 04:40 UTC | 21h 49m |
| 2026-05-02 | CQH6566 | KIX → PVG | May 2, 06:05 UTC | May 3, 04:40 UTC | 22h 34m |
| 2026-05-01 | CQH6582 | KIX → PVG | May 1, 10:45 UTC | May 2, 04:20 UTC | 17h 35m |
| 2026-05-01 | CQH6576 | KIX → PVG | May 1, 03:30 UTC | May 1, 09:05 UTC | 5h 35m |
| 2026-04-30 | CQH6582 | KIX → PVG | Apr 30, 10:55 UTC | May 1, 02:05 UTC | 15h 10m |
| 2026-04-30 | CQH6576 | KIX → PVG | Apr 30, 03:40 UTC | Apr 30, 09:05 UTC | 5h 25m |
| 2026-04-30 | CQH6575 | PVG → KIX | Apr 30, 01:35 UTC | Apr 30, 02:00 UTC | 25m |
| 2026-04-29 | CQH6566 | KIX → PVG | Apr 29, 06:00 UTC | Apr 30, 02:00 UTC | 20h 0m |
| 2026-04-29 | CQH6565 | PVG → KIX | Apr 29, 03:45 UTC | Apr 29, 04:10 UTC | 25m |
| 2026-04-28 | CQH6565 | PVG → KIX | Apr 28, 06:50 UTC | Apr 29, 04:10 UTC | 21h 20m |
| 2026-04-28 | CQH6566 | KIX → PVG | Apr 28, 06:10 UTC | Apr 29, 04:10 UTC | 22h 0m |
| 2026-04-27 | CQH6582 | KIX → PVG | Apr 27, 10:40 UTC | Apr 28, 04:40 UTC | 18h 0m |
| 2026-04-27 | CQH6576 | KIX → PVG | Apr 27, 04:05 UTC | Apr 27, 09:00 UTC | 4h 55m |
| 2026-04-26 | CQH6575 | PVG → KIX | Apr 26, 06:50 UTC | Apr 27, 01:55 UTC | 19h 5m |
| 2026-04-26 | CQH6566 | KIX → PVG | Apr 26, 06:10 UTC | Apr 27, 01:55 UTC | 19h 45m |
| 2026-04-25 | CQH6582 | KIX → PVG | Apr 25, 11:00 UTC | Apr 26, 04:10 UTC | 17h 10m |
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-321F page for operator, model, and routing details .