sensors Mode-S transponder
781CD8
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-327M · AIRBUS A-321neo
- Hex
- 781CD8
- Octal
- 36016330
- Decimal
- 7,871,704
- Country
- CN
- Tail
- B-327M
- Type
- A21N
- Flights observed
- 64
- Distinct callsigns
- 10
- Country
- CN
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 781CD8 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 10 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| QDA918 | Qingdao Airlines | 15 | 2026-06-02 |
| QDA917 | Qingdao Airlines | 15 | 2026-06-02 |
| QDA908 | Qingdao Airlines | 8 | 2026-05-27 |
| QDA930 | - | 7 | 2026-05-20 |
| QDA907 | Qingdao Airlines | 7 | 2026-05-27 |
| QDA929 | - | 6 | 2026-05-20 |
| QDA923 | Qingdao Airlines | 2 | 2026-04-18 |
| QDA9841 | - | 1 | 2026-04-24 |
| QDA924 | Qingdao Airlines | 1 | 2026-04-25 |
| QDA6054 | Qingdao Airlines | 1 | 2026-04-30 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-02 | QDA918 | BKK → TAO | Jun 2, 11:40 UTC | Jun 2, 13:30 UTC | 1h 50m |
| 2026-06-02 | QDA917 | TAO → BKK | Jun 2, 08:15 UTC | Jun 2, 10:10 UTC | 1h 55m |
| 2026-05-31 | QDA918 | BKK → TAO | May 31, 11:25 UTC | May 31, 13:10 UTC | 1h 45m |
| 2026-05-31 | QDA917 | TAO → BKK | May 31, 08:25 UTC | May 31, 10:00 UTC | 1h 35m |
| 2026-05-29 | QDA918 | BKK → TAO | May 29, 11:45 UTC | May 29, 13:35 UTC | 1h 50m |
| 2026-05-29 | QDA917 | TAO → BKK | May 29, 08:20 UTC | May 29, 10:10 UTC | 1h 50m |
| 2026-05-27 | QDA908 | KUL → TAO | May 27, 09:00 UTC | May 27, 13:05 UTC | 4h 5m |
| 2026-05-27 | QDA907 | TAO → KUL | May 27, 06:44 UTC | May 27, 07:10 UTC | 25m |
| 2026-05-26 | QDA918 | BKK → TAO | May 26, 11:34 UTC | May 26, 12:30 UTC | 55m |
| 2026-05-26 | QDA917 | TAO → BKK | May 26, 09:09 UTC | May 26, 10:05 UTC | 55m |
| 2026-05-24 | QDA918 | BKK → TAO | May 24, 11:50 UTC | May 24, 12:45 UTC | 55m |
| 2026-05-24 | QDA917 | TAO → BKK | May 24, 08:50 UTC | May 24, 09:50 UTC | 1h 0m |
| 2026-05-22 | QDA908 | KUL → TAO | May 22, 08:45 UTC | May 22, 12:50 UTC | 4h 5m |
| 2026-05-21 | QDA907 | TAO → KUL | May 21, 12:20 UTC | May 22, 07:10 UTC | 18h 50m |
| 2026-05-21 | QDA907 | TAO → KUL | May 21, 11:30 UTC | May 22, 07:10 UTC | 19h 40m |
| 2026-05-21 | QDA908 | KUL → TAO | May 21, 08:15 UTC | May 22, 07:10 UTC | 22h 55m |
| 2026-05-20 | QDA930 | - | May 20, 17:20 UTC | May 21, 06:50 UTC | 13h 30m |
| 2026-05-20 | QDA929 | - | May 20, 15:25 UTC | May 20, 15:45 UTC | 20m |
| 2026-05-20 | QDA929 | - | May 20, 12:30 UTC | May 20, 12:40 UTC | 10m |
| 2026-05-15 | QDA918 | BKK → TAO | May 15, 11:55 UTC | May 15, 12:50 UTC | 55m |
| 2026-05-15 | QDA917 | TAO → BKK | May 15, 09:20 UTC | May 15, 10:30 UTC | 1h 10m |
| 2026-05-13 | QDA908 | KUL → TAO | May 13, 09:00 UTC | May 13, 13:00 UTC | 4h 0m |
| 2026-05-12 | QDA918 | BKK → TAO | May 12, 12:45 UTC | May 13, 07:10 UTC | 18h 25m |
| 2026-05-12 | QDA917 | TAO → BKK | May 12, 10:10 UTC | May 12, 11:20 UTC | 1h 10m |
| 2026-05-10 | QDA918 | BKK → TAO | May 10, 11:50 UTC | May 10, 12:40 UTC | 50m |
| 2026-05-10 | QDA917 | TAO → BKK | May 10, 09:10 UTC | May 10, 10:19 UTC | 1h 10m |
| 2026-05-08 | QDA918 | BKK → TAO | May 8, 12:55 UTC | May 8, 13:45 UTC | 50m |
| 2026-05-08 | QDA917 | TAO → BKK | May 8, 09:49 UTC | May 8, 11:19 UTC | 1h 30m |
| 2026-05-05 | QDA918 | BKK → TAO | May 5, 11:45 UTC | May 5, 12:10 UTC | 25m |
| 2026-05-05 | QDA917 | TAO → BKK | May 5, 09:45 UTC | May 5, 10:15 UTC | 30m |
| 2026-05-03 | QDA918 | BKK → TAO | May 3, 11:45 UTC | May 3, 12:15 UTC | 30m |
| 2026-05-03 | QDA917 | TAO → BKK | May 3, 09:50 UTC | May 3, 10:25 UTC | 35m |
| 2026-04-30 | QDA6054 | LYA → SHE | Apr 30, 12:40 UTC | Apr 30, 12:50 UTC | 10m |
| 2026-04-29 | QDA918 | BKK → TAO | Apr 29, 12:50 UTC | Apr 29, 13:15 UTC | 25m |
| 2026-04-29 | QDA917 | TAO → BKK | Apr 29, 10:50 UTC | Apr 29, 11:15 UTC | 25m |
| 2026-04-26 | QDA908 | KUL → TAO | Apr 26, 08:35 UTC | Apr 26, 12:35 UTC | 4h 0m |
| 2026-04-25 | QDA907 | TAO → KUL | Apr 25, 12:05 UTC | Apr 26, 07:15 UTC | 19h 10m |
| 2026-04-25 | QDA907 | TAO → KUL | Apr 25, 10:05 UTC | Apr 26, 07:15 UTC | 21h 10m |
| 2026-04-25 | QDA924 | PEN → TAO | Apr 25, 06:05 UTC | Apr 26, 06:00 UTC | 23h 55m |
| 2026-04-24 | QDA930 | - | Apr 24, 18:05 UTC | Apr 25, 12:45 UTC | 18h 40m |
| 2026-04-24 | QDA930 | - | Apr 24, 17:50 UTC | Apr 25, 12:45 UTC | 18h 55m |
| 2026-04-24 | QDA929 | - | Apr 24, 11:45 UTC | Apr 24, 16:15 UTC | 4h 30m |
| 2026-04-24 | - | - | Apr 24, 03:50 UTC | Apr 24, 04:15 UTC | 25m |
| 2026-04-24 | QDA9841 | - | Apr 24, 01:45 UTC | Apr 24, 02:15 UTC | 30m |
| 2026-04-22 | QDA918 | BKK → TAO | Apr 22, 12:25 UTC | Apr 22, 13:20 UTC | 55m |
| 2026-04-22 | QDA917 | TAO → BKK | Apr 22, 09:45 UTC | Apr 22, 10:45 UTC | 1h 0m |
| 2026-04-20 | QDA918 | BKK → TAO | Apr 20, 12:05 UTC | Apr 20, 13:00 UTC | 55m |
| 2026-04-20 | QDA917 | TAO → BKK | Apr 20, 09:40 UTC | Apr 20, 10:35 UTC | 55m |
| 2026-04-18 | QDA923 | TAO → PEN | Apr 18, 06:05 UTC | Apr 18, 06:25 UTC | 20m |
| 2026-04-18 | QDA923 | TAO → PEN | Apr 18, 03:35 UTC | Apr 18, 04:20 UTC | 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-327M page for operator, model, and routing details .