sensors Mode-S transponder
781B9A
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-323W · AIRBUS A-320neo
- Hex
- 781B9A
- Octal
- 36015632
- Decimal
- 7,871,386
- Country
- CN
- Tail
- B-323W
- Type
- A20N
- Flights observed
- 23
- Distinct callsigns
- 13
- Country
- CN
- Last broadcast
- 4d ago
Last known position
Country allocation
The ICAO 24-bit address 781B9A 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 13 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| QDA901 | - | 4 | 2026-06-22 |
| QDA920 | - | 2 | 2026-06-24 |
| QDA910 | - | 2 | 2026-06-24 |
| QDA909 | - | 2 | 2026-06-24 |
| QDA903 | - | 2 | 2026-06-11 |
| QDA902 | - | 2 | 2026-06-22 |
| QDA6063 | - | 2 | 2026-07-04 |
| QDA966 | Qingdao Airlines | 1 | 2026-05-29 |
| QDA965 | Qingdao Airlines | 1 | 2026-05-29 |
| QDA919 | - | 1 | 2026-06-24 |
| QDA90X | - | 1 | 2026-05-11 |
| QDA904 | - | 1 | 2026-06-12 |
| QDA6064 | Qingdao Airlines | 1 | 2026-06-10 |
Recent flights last 23
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-04 | QDA6063 | - | Jul 4, 05:05 UTC | Jul 4, 11:35 UTC | 6h 30m |
| 2026-06-29 | - | - | Jun 29, 03:49 UTC | Jun 29, 04:04 UTC | 15m |
| 2026-06-24 | QDA920 | - | Jun 24, 13:20 UTC | Jun 24, 14:04 UTC | 45m |
| 2026-06-24 | QDA919 | - | Jun 24, 11:20 UTC | Jun 24, 12:04 UTC | 45m |
| 2026-06-24 | QDA910 | - | Jun 24, 04:55 UTC | Jun 24, 06:39 UTC | 1h 45m |
| 2026-06-24 | QDA909 | - | Jun 24, 01:55 UTC | Jun 24, 03:15 UTC | 1h 20m |
| 2026-06-22 | QDA902 | - | Jun 22, 13:35 UTC | Jun 22, 14:05 UTC | 30m |
| 2026-06-22 | QDA901 | - | Jun 22, 11:39 UTC | Jun 22, 12:10 UTC | 30m |
| 2026-06-21 | QDA901 | ICN → ICN | Jun 21, 13:39 UTC | Jun 22, 12:10 UTC | 22h 30m |
| 2026-06-21 | QDA901 | - | Jun 21, 11:55 UTC | Jun 21, 12:40 UTC | 45m |
| 2026-06-12 | QDA904 | - | Jun 12, 04:20 UTC | Jun 12, 06:00 UTC | 1h 40m |
| 2026-06-11 | QDA903 | - | Jun 11, 10:10 UTC | Jun 12, 02:50 UTC | 16h 41m |
| 2026-06-11 | QDA903 | - | Jun 11, 05:15 UTC | Jun 12, 02:50 UTC | 21h 36m |
| 2026-06-10 | QDA6064 | CSX → HRB | Jun 10, 10:50 UTC | Jun 11, 10:30 UTC | 23h 40m |
| 2026-06-01 | QDA902 | ICN → TAO | Jun 1, 13:35 UTC | Jun 1, 13:55 UTC | 20m |
| 2026-06-01 | QDA901 | TAO → ICN | Jun 1, 11:35 UTC | Jun 1, 12:05 UTC | 30m |
| 2026-05-29 | QDA966 | MNL → CSX | May 29, 19:40 UTC | May 29, 21:25 UTC | 1h 45m |
| 2026-05-29 | QDA965 | CSX → MNL | May 29, 16:15 UTC | May 29, 18:00 UTC | 1h 45m |
| 2026-05-24 | QDA920 | TAE → TAO | May 24, 13:25 UTC | May 24, 14:05 UTC | 40m |
| 2026-05-24 | QDA910 | NGO → TAO | May 24, 04:55 UTC | May 24, 11:50 UTC | 6h 55m |
| 2026-05-24 | QDA909 | TAO → NGO | May 24, 01:55 UTC | May 24, 03:20 UTC | 1h 25m |
| 2026-05-11 | QDA90X | - | May 11, 08:00 UTC | May 11, 08:20 UTC | 20m |
| 2026-04-30 | QDA6063 | HRB → CSX | Apr 30, 05:40 UTC | Apr 30, 11:25 UTC | 5h 45m |
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-323W page for operator, model, and routing details .