sensors Mode-S transponder
781C93
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-326M · AIRBUS A-321neo
- Hex
- 781C93
- Octal
- 36016223
- Decimal
- 7,871,635
- Country
- CN
- Tail
- B-326M
- Type
- A21N
- Flights observed
- 176
- Distinct callsigns
- 12
- Country
- CN
- Last broadcast
- 14h ago
Last known position
Country allocation
The ICAO 24-bit address 781C93 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 12 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| QDA907 | - | 79 | 2026-07-16 |
| QDA908 | - | 58 | 2026-07-17 |
| QDA929 | - | 11 | 2026-06-10 |
| QDA930 | - | 10 | 2026-06-10 |
| QDA6054 | - | 7 | 2026-07-07 |
| QDA926 | Qingdao Airlines | 2 | 2026-05-25 |
| QDA924 | Qingdao Airlines | 2 | 2026-04-16 |
| QDA918 | Qingdao Airlines | 2 | 2026-04-26 |
| QDA917 | Qingdao Airlines | 2 | 2026-04-26 |
| QDA9799 | - | 1 | 2026-06-25 |
| QDA923 | Qingdao Airlines | 1 | 2026-04-16 |
| QDA902 | Qingdao Airlines | 1 | 2026-05-05 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-17 | QDA908 | - | Jul 17, 08:30 UTC | Jul 17, 12:40 UTC | 4h 10m |
| 2026-07-16 | QDA907 | - | Jul 16, 12:49 UTC | Jul 17, 07:05 UTC | 18h 15m |
| 2026-07-16 | QDA907 | - | Jul 16, 11:50 UTC | Jul 17, 07:05 UTC | 19h 15m |
| 2026-07-16 | QDA907 | - | Jul 16, 08:50 UTC | Jul 17, 07:05 UTC | 22h 15m |
| 2026-07-16 | QDA908 | - | Jul 16, 08:30 UTC | Jul 17, 06:45 UTC | 22h 15m |
| 2026-07-15 | QDA907 | - | Jul 15, 12:50 UTC | Jul 16, 06:50 UTC | 18h 0m |
| 2026-07-15 | QDA908 | - | Jul 15, 09:30 UTC | Jul 16, 06:45 UTC | 21h 15m |
| 2026-07-14 | QDA907 | - | Jul 14, 13:00 UTC | Jul 15, 07:30 UTC | 18h 29m |
| 2026-07-14 | QDA907 | - | Jul 14, 12:00 UTC | Jul 15, 07:30 UTC | 19h 29m |
| 2026-07-14 | QDA908 | - | Jul 14, 08:50 UTC | Jul 15, 07:30 UTC | 22h 39m |
| 2026-07-13 | QDA907 | - | Jul 13, 12:50 UTC | Jul 14, 07:05 UTC | 18h 15m |
| 2026-07-13 | QDA908 | - | Jul 13, 12:10 UTC | Jul 14, 07:05 UTC | 18h 55m |
| 2026-07-13 | QDA908 | - | Jul 13, 08:55 UTC | Jul 14, 07:05 UTC | 22h 10m |
| 2026-07-13 | QDA907 | - | Jul 13, 06:55 UTC | Jul 13, 07:20 UTC | 25m |
| 2026-07-12 | QDA907 | - | Jul 12, 11:45 UTC | Jul 13, 04:10 UTC | 16h 25m |
| 2026-07-12 | QDA907 | - | Jul 12, 06:15 UTC | Jul 13, 04:10 UTC | 21h 55m |
| 2026-07-07 | QDA6054 | - | Jul 7, 12:55 UTC | Jul 8, 06:20 UTC | 17h 25m |
| 2026-07-05 | QDA908 | - | Jul 5, 13:15 UTC | Jul 6, 06:25 UTC | 17h 10m |
| 2026-07-05 | QDA908 | - | Jul 5, 09:00 UTC | Jul 6, 06:25 UTC | 21h 25m |
| 2026-07-05 | QDA907 | - | Jul 5, 06:40 UTC | Jul 5, 07:25 UTC | 45m |
| 2026-07-04 | QDA908 | - | Jul 4, 09:15 UTC | Jul 5, 04:00 UTC | 18h 45m |
| 2026-07-03 | QDA907 | - | Jul 3, 13:35 UTC | Jul 4, 07:00 UTC | 17h 25m |
| 2026-07-03 | QDA907 | - | Jul 3, 12:35 UTC | Jul 4, 07:00 UTC | 18h 25m |
| 2026-07-03 | QDA908 | - | Jul 3, 09:30 UTC | Jul 4, 07:00 UTC | 21h 30m |
| 2026-07-02 | QDA907 | - | Jul 2, 12:55 UTC | Jul 3, 07:35 UTC | 18h 40m |
| 2026-07-02 | QDA907 | - | Jul 2, 11:55 UTC | Jul 3, 07:35 UTC | 19h 40m |
| 2026-07-02 | QDA907 | - | Jul 2, 08:50 UTC | Jul 3, 07:35 UTC | 22h 45m |
| 2026-07-02 | QDA908 | - | Jul 2, 08:40 UTC | Jul 3, 04:20 UTC | 19h 40m |
| 2026-07-02 | QDA907 | - | Jul 2, 06:35 UTC | Jul 2, 07:00 UTC | 25m |
| 2026-07-01 | QDA908 | - | Jul 1, 09:10 UTC | Jul 2, 03:45 UTC | 18h 35m |
| 2026-07-01 | QDA907 | - | Jul 1, 06:55 UTC | Jul 1, 07:25 UTC | 30m |
| 2026-06-30 | QDA908 | - | Jun 30, 08:50 UTC | Jul 1, 04:05 UTC | 19h 15m |
| 2026-06-29 | QDA907 | - | Jun 29, 15:30 UTC | Jun 30, 07:00 UTC | 15h 30m |
| 2026-06-27 | QDA6054 | - | Jun 27, 13:30 UTC | Jun 28, 03:05 UTC | 13h 35m |
| 2026-06-25 | QDA9799 | - | Jun 25, 14:09 UTC | Jun 26, 03:10 UTC | 13h 0m |
| 2026-06-24 | QDA908 | - | Jun 24, 09:05 UTC | Jun 24, 12:54 UTC | 3h 50m |
| 2026-06-24 | QDA907 | - | Jun 24, 03:55 UTC | Jun 24, 07:30 UTC | 3h 35m |
| 2026-06-23 | QDA907 | - | Jun 23, 11:40 UTC | Jun 24, 07:30 UTC | 19h 50m |
| 2026-06-23 | QDA907 | - | Jun 23, 08:50 UTC | Jun 24, 07:30 UTC | 22h 40m |
| 2026-06-23 | QDA908 | - | Jun 23, 08:35 UTC | Jun 24, 04:05 UTC | 19h 30m |
| 2026-06-22 | QDA907 | - | Jun 22, 12:49 UTC | Jun 23, 06:59 UTC | 18h 10m |
| 2026-06-22 | QDA908 | - | Jun 22, 12:40 UTC | Jun 23, 06:59 UTC | 18h 20m |
| 2026-06-22 | QDA908 | - | Jun 22, 09:30 UTC | Jun 23, 06:59 UTC | 21h 30m |
| 2026-06-21 | QDA907 | - | Jun 21, 12:49 UTC | Jun 22, 08:10 UTC | 19h 20m |
| 2026-06-21 | QDA907 | - | Jun 21, 12:04 UTC | Jun 22, 08:10 UTC | 20h 5m |
| 2026-06-21 | QDA908 | - | Jun 21, 08:54 UTC | Jun 22, 08:10 UTC | 23h 15m |
| 2026-06-21 | QDA907 | - | Jun 21, 06:50 UTC | Jun 21, 07:14 UTC | 25m |
| 2026-06-20 | QDA908 | - | Jun 20, 08:49 UTC | Jun 21, 03:44 UTC | 18h 55m |
| 2026-06-20 | QDA908 | - | Jun 20, 08:25 UTC | Jun 21, 03:44 UTC | 19h 20m |
| 2026-06-20 | QDA907 | - | Jun 20, 02:59 UTC | Jun 20, 06:49 UTC | 3h 50m |
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-326M page for operator, model, and routing details .