sensors Mode-S transponder
781741
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-309Y · AIRBUS A-320neo
- Hex
- 781741
- Octal
- 36013501
- Decimal
- 7,870,273
- Country
- CN
- Tail
- B-309Y
- Type
- A20N
- Flights observed
- 161
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- Jul 26, 10:55 UTC
Last known position
Country allocation
The ICAO 24-bit address 781741 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 |
|---|---|---|---|
| CSN652 | - | 8 | 2026-07-17 |
| CSN6465 | - | 8 | 2026-07-11 |
| CSN651 | - | 6 | 2026-07-17 |
| CSN6483 | China Southern Airlines | 5 | 2026-04-26 |
| CSN6469 | China Southern Airlines | 5 | 2026-07-26 |
| CSN6388 | - | 5 | 2026-07-14 |
| CSN6312 | - | 5 | 2026-06-18 |
| CSN6309 | - | 5 | 2026-06-20 |
| CSN5811 | - | 5 | 2026-07-20 |
| CSN671 | - | 4 | 2026-07-12 |
| CSN6311 | - | 4 | 2026-06-18 |
| CSN5366 | - | 4 | 2026-07-01 |
| CSN3956 | - | 4 | 2026-06-23 |
| CSN3955 | - | 4 | 2026-06-23 |
| CSN672 | - | 3 | 2026-07-12 |
| CSN6416 | China Southern Airlines | 3 | 2026-07-07 |
| CSN6339 | China Southern Airlines | 3 | 2026-05-25 |
| CSN6315 | - | 3 | 2026-07-08 |
| CSN6304 | - | 3 | 2026-06-25 |
| CSN6265 | China Southern Airlines | 3 | 2026-07-21 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | CSN6469 | SHE → CKG | Jul 26, 04:50 UTC | Jul 26, 10:55 UTC | 6h 6m |
| 2026-07-25 | CSN5867 | SHE → HGH | Jul 25, 12:45 UTC | Jul 26, 10:55 UTC | 22h 11m |
| 2026-07-25 | CSN5867 | SHE → HGH | Jul 25, 10:05 UTC | Jul 26, 05:10 UTC | 19h 5m |
| 2026-07-24 | CSN6367 | SHE → CAN | Jul 24, 08:20 UTC | Jul 25, 04:05 UTC | 19h 45m |
| 2026-07-24 | CSN6367 | SHE → CAN | Jul 24, 08:05 UTC | Jul 25, 04:05 UTC | 20h 0m |
| 2026-07-23 | CSN6517 | SHE → XMN | Jul 23, 08:45 UTC | Jul 24, 03:25 UTC | 18h 40m |
| 2026-07-23 | CSN6517 | SHE → XMN | Jul 23, 05:35 UTC | Jul 24, 03:25 UTC | 21h 50m |
| 2026-07-22 | CSN5364 | - | Jul 22, 14:45 UTC | Jul 23, 09:00 UTC | 18h 15m |
| 2026-07-21 | CSN6265 | SHE → HGH | Jul 21, 07:50 UTC | Jul 21, 08:00 UTC | 10m |
| 2026-07-20 | CSN6265 | SHE → HGH | Jul 20, 08:55 UTC | Jul 21, 08:00 UTC | 23h 4m |
| 2026-07-20 | CSN5811 | - | Jul 20, 01:30 UTC | Jul 20, 09:00 UTC | 7h 30m |
| 2026-07-19 | CSN5811 | - | Jul 19, 09:40 UTC | Jul 20, 05:00 UTC | 19h 20m |
| 2026-07-19 | CSN5811 | - | Jul 19, 04:35 UTC | Jul 20, 01:40 UTC | 21h 5m |
| 2026-07-19 | CSN5811 | - | Jul 19, 01:45 UTC | Jul 19, 09:45 UTC | 8h 0m |
| 2026-07-18 | CSN5811 | - | Jul 18, 10:00 UTC | Jul 19, 05:15 UTC | 19h 15m |
| 2026-07-17 | CSN652 | - | Jul 17, 03:20 UTC | Jul 17, 03:55 UTC | 35m |
| 2026-07-17 | CSN651 | - | Jul 17, 00:30 UTC | Jul 17, 01:20 UTC | 50m |
| 2026-07-16 | CSN5857 | - | Jul 16, 01:00 UTC | Jul 16, 13:00 UTC | 12h 0m |
| 2026-07-14 | CSN6388 | - | Jul 14, 12:20 UTC | Jul 14, 12:30 UTC | 10m |
| 2026-07-14 | CSN682 | - | Jul 14, 04:00 UTC | Jul 14, 07:50 UTC | 3h 50m |
| 2026-07-14 | CSN681 | - | Jul 14, 01:50 UTC | Jul 14, 02:15 UTC | 25m |
| 2026-07-13 | CSN652 | - | Jul 13, 02:55 UTC | Jul 13, 03:20 UTC | 25m |
| 2026-07-12 | CSN672 | ICN → ICN | Jul 12, 13:05 UTC | Jul 13, 01:45 UTC | 12h 40m |
| 2026-07-12 | CSN671 | - | Jul 12, 11:01 UTC | Jul 12, 11:25 UTC | 25m |
| 2026-07-12 | CSN6402 | - | Jul 12, 07:31 UTC | Jul 12, 07:45 UTC | 15m |
| 2026-07-11 | CSN6465 | - | Jul 11, 09:00 UTC | Jul 12, 07:45 UTC | 22h 45m |
| 2026-07-10 | CSN6465 | - | Jul 10, 15:00 UTC | Jul 11, 09:25 UTC | 18h 26m |
| 2026-07-10 | CSN652 | - | Jul 10, 03:35 UTC | Jul 10, 15:05 UTC | 11h 30m |
| 2026-07-10 | CSN651 | - | Jul 10, 02:05 UTC | Jul 10, 02:25 UTC | 20m |
| 2026-07-09 | CSN652 | - | Jul 9, 03:00 UTC | Jul 9, 03:25 UTC | 25m |
| 2026-07-09 | CSN651 | - | Jul 9, 00:50 UTC | Jul 9, 01:10 UTC | 20m |
| 2026-07-08 | CSN6315 | - | Jul 8, 02:35 UTC | Jul 8, 13:35 UTC | 11h 0m |
| 2026-07-07 | CSN6416 | XIY → SHE | Jul 7, 01:30 UTC | Jul 7, 06:05 UTC | 4h 35m |
| 2026-07-06 | CSN6469 | - | Jul 6, 04:55 UTC | Jul 7, 01:45 UTC | 20h 50m |
| 2026-07-06 | CSN6469 | - | Jul 6, 01:20 UTC | Jul 6, 05:15 UTC | 3h 55m |
| 2026-07-03 | CSN6529 | - | Jul 3, 12:25 UTC | Jul 4, 04:10 UTC | 15h 45m |
| 2026-07-02 | CSN6416 | XIY → SHE | Jul 2, 01:25 UTC | Jul 2, 05:00 UTC | 3h 35m |
| 2026-07-01 | CSN5366 | - | Jul 1, 09:45 UTC | Jul 2, 05:00 UTC | 19h 15m |
| 2026-06-30 | CSN672 | - | Jun 30, 12:45 UTC | Jul 1, 09:55 UTC | 21h 10m |
| 2026-06-30 | CSN671 | - | Jun 30, 07:30 UTC | Jun 30, 11:20 UTC | 3h 50m |
| 2026-06-29 | CSN671 | - | Jun 29, 13:24 UTC | Jun 30, 11:20 UTC | 21h 56m |
| 2026-06-29 | CSN666 | - | Jun 29, 02:25 UTC | Jun 29, 13:30 UTC | 11h 5m |
| 2026-06-28 | CSN665 | - | Jun 28, 23:54 UTC | Jun 29, 01:05 UTC | 1h 10m |
| 2026-06-27 | CSN6674 | TFU → SHE | Jun 27, 06:40 UTC | Jun 27, 12:50 UTC | 6h 10m |
| 2026-06-27 | CSN652 | - | Jun 27, 02:55 UTC | Jun 27, 03:15 UTC | 20m |
| 2026-06-27 | CSN651 | - | Jun 27, 00:55 UTC | Jun 27, 01:15 UTC | 20m |
| 2026-06-26 | CSN6347 | - | Jun 26, 00:15 UTC | Jun 26, 13:15 UTC | 13h 0m |
| 2026-06-25 | CSN6304 | - | Jun 25, 21:50 UTC | Jun 25, 22:10 UTC | 20m |
| 2026-06-25 | CSN3455 | - | Jun 25, 07:19 UTC | Jun 25, 07:30 UTC | 10m |
| 2026-06-24 | CSN6849 | - | Jun 24, 23:50 UTC | Jun 24, 23:59 UTC | 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-309Y page for operator, model, and routing details .