sensors Mode-S transponder
781031
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-8640 · AIRBUS A-321
- Hex
- 781031
- Octal
- 36010061
- Decimal
- 7,868,465
- Country
- CN
- Tail
- B-8640
- Type
- A321
- Flights observed
- 87
- Distinct callsigns
- 19
- Country
- CN
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 781031 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 19 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CSN6077 | China Southern Airlines | 15 | 2026-06-09 |
| CSN6437 | - | 14 | 2026-07-16 |
| CSN313 | China Southern Airlines | 13 | 2026-05-21 |
| CSN6078 | China Southern Airlines | 12 | 2026-06-03 |
| CSN314 | China Southern Airlines | 9 | 2026-05-22 |
| CSN6209 | - | 4 | 2026-07-01 |
| CSN6515 | China Southern Airlines | 2 | 2026-05-08 |
| CSN6509 | - | 2 | 2026-07-06 |
| CSN6373 | - | 2 | 2026-07-05 |
| CSN6346 | - | 2 | 2026-07-07 |
| CSN5872 | - | 2 | 2026-07-12 |
| CSN370 | - | 2 | 2026-06-18 |
| CSN369 | - | 2 | 2026-06-18 |
| CSN8310 | China Southern Airlines | 1 | 2026-06-16 |
| CSN8309 | - | 1 | 2026-06-16 |
| CSN6753 | China Southern Airlines | 1 | 2026-04-29 |
| CSN6543 | - | 1 | 2026-07-15 |
| CSN6104 | China Southern Airlines | 1 | 2026-06-28 |
| CSN6096 | China Southern Airlines | 1 | 2026-05-03 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-16 | CSN6437 | - | Jul 16, 04:50 UTC | Jul 16, 13:34 UTC | 8h 45m |
| 2026-07-15 | CSN6543 | - | Jul 15, 04:25 UTC | Jul 15, 05:10 UTC | 45m |
| 2026-07-12 | CSN5872 | - | Jul 12, 15:10 UTC | Jul 13, 09:50 UTC | 18h 40m |
| 2026-07-07 | CSN6346 | - | Jul 7, 12:25 UTC | Jul 7, 17:05 UTC | 4h 40m |
| 2026-07-06 | CSN6346 | - | Jul 6, 15:20 UTC | Jul 7, 12:45 UTC | 21h 25m |
| 2026-07-06 | CSN6509 | - | Jul 6, 05:35 UTC | Jul 6, 15:30 UTC | 9h 55m |
| 2026-07-05 | CSN6373 | - | Jul 5, 15:10 UTC | Jul 6, 05:35 UTC | 14h 25m |
| 2026-07-01 | CSN6437 | - | Jul 1, 13:00 UTC | Jul 2, 04:00 UTC | 15h 0m |
| 2026-07-01 | CSN6437 | - | Jul 1, 04:40 UTC | Jul 2, 04:00 UTC | 23h 20m |
| 2026-07-01 | CSN6209 | - | Jul 1, 04:05 UTC | Jul 2, 00:20 UTC | 20h 15m |
| 2026-06-28 | CSN6104 | CTU → PKX | Jun 28, 11:35 UTC | Jun 28, 11:55 UTC | 20m |
| 2026-06-27 | CSN6437 | - | Jun 27, 14:39 UTC | Jun 28, 05:24 UTC | 14h 45m |
| 2026-06-25 | CSN6437 | - | Jun 25, 04:20 UTC | Jun 25, 13:24 UTC | 9h 5m |
| 2026-06-22 | CSN6437 | - | Jun 22, 13:35 UTC | Jun 23, 04:45 UTC | 15h 10m |
| 2026-06-22 | CSN6437 | - | Jun 22, 04:24 UTC | Jun 23, 04:09 UTC | 23h 45m |
| 2026-06-19 | CSN6437 | - | Jun 19, 12:49 UTC | Jun 20, 04:39 UTC | 15h 50m |
| 2026-06-19 | CSN6437 | - | Jun 19, 03:44 UTC | Jun 19, 13:09 UTC | 9h 25m |
| 2026-06-18 | CSN370 | - | Jun 18, 12:30 UTC | Jun 19, 04:14 UTC | 15h 44m |
| 2026-06-18 | CSN369 | - | Jun 18, 09:55 UTC | Jun 18, 10:35 UTC | 40m |
| 2026-06-16 | CSN8310 | NRT → PVG | Jun 16, 05:50 UTC | Jun 16, 07:34 UTC | 1h 45m |
| 2026-06-16 | CSN8309 | - | Jun 16, 02:04 UTC | Jun 16, 03:45 UTC | 1h 40m |
| 2026-06-14 | CSN6373 | CGQ → PVG | Jun 14, 03:50 UTC | Jun 14, 13:15 UTC | 9h 25m |
| 2026-06-13 | CSN5872 | - | Jun 13, 10:55 UTC | Jun 14, 04:30 UTC | 17h 35m |
| 2026-06-11 | CSN6437 | SYX → HGH | Jun 11, 04:10 UTC | Jun 11, 13:30 UTC | 9h 20m |
| 2026-06-10 | CSN370 | ICN → PVG | Jun 10, 12:35 UTC | Jun 11, 04:10 UTC | 15h 35m |
| 2026-06-10 | CSN369 | PVG → ICN | Jun 10, 10:10 UTC | Jun 10, 10:40 UTC | 30m |
| 2026-06-09 | CSN6077 | PVG → SGN | Jun 9, 02:50 UTC | Jun 9, 08:35 UTC | 5h 45m |
| 2026-06-03 | CSN6078 | SGN → PVG | Jun 3, 02:50 UTC | Jun 3, 08:35 UTC | 5h 45m |
| 2026-06-02 | CSN6078 | SGN → PVG | Jun 2, 07:15 UTC | Jun 3, 03:05 UTC | 19h 50m |
| 2026-06-02 | CSN6078 | SGN → PVG | Jun 2, 02:50 UTC | Jun 2, 08:15 UTC | 5h 25m |
| 2026-05-29 | CSN6077 | PVG → SGN | May 29, 12:40 UTC | May 30, 08:15 UTC | 19h 35m |
| 2026-05-29 | CSN6077 | PVG → SGN | May 29, 04:20 UTC | May 30, 02:55 UTC | 22h 35m |
| 2026-05-29 | CSN6209 | HRB → PVG | May 29, 03:50 UTC | May 29, 12:40 UTC | 8h 50m |
| 2026-05-28 | CSN6437 | SYX → HGH | May 28, 12:45 UTC | May 29, 04:20 UTC | 15h 35m |
| 2026-05-28 | CSN6437 | SYX → HGH | May 28, 04:25 UTC | May 29, 03:55 UTC | 23h 30m |
| 2026-05-28 | CSN6437 | SYX → HGH | May 28, 03:55 UTC | May 28, 13:30 UTC | 9h 35m |
| 2026-05-26 | CSN6078 | SGN → PVG | May 26, 04:20 UTC | May 26, 09:49 UTC | 5h 30m |
| 2026-05-24 | CSN6509 | SHE → PVG | May 24, 15:10 UTC | May 24, 15:40 UTC | 30m |
| 2026-05-23 | CSN6078 | SGN → PVG | May 23, 02:45 UTC | May 23, 09:20 UTC | 6h 35m |
| 2026-05-22 | CSN6078 | SGN → PVG | May 22, 12:50 UTC | May 23, 09:20 UTC | 20h 29m |
| 2026-05-22 | CSN314 | ICN → PVG | May 22, 04:20 UTC | May 23, 02:55 UTC | 22h 34m |
| 2026-05-22 | CSN314 | ICN → PVG | May 22, 04:10 UTC | May 22, 13:25 UTC | 9h 14m |
| 2026-05-21 | CSN313 | PVG → ICN | May 21, 12:20 UTC | May 22, 02:15 UTC | 13h 55m |
| 2026-05-19 | CSN6077 | PVG → SGN | May 19, 02:40 UTC | May 19, 08:10 UTC | 5h 30m |
| 2026-05-18 | CSN6209 | HRB → PVG | May 18, 03:50 UTC | May 18, 04:00 UTC | 10m |
| 2026-05-16 | CSN6437 | SYX → HGH | May 16, 12:40 UTC | May 16, 13:11 UTC | 30m |
| 2026-05-15 | CSN6077 | PVG → SGN | May 15, 02:35 UTC | May 15, 03:00 UTC | 25m |
| 2026-05-14 | CSN314 | ICN → PVG | May 14, 03:50 UTC | May 14, 04:10 UTC | 20m |
| 2026-05-14 | CSN313 | PVG → ICN | May 14, 01:40 UTC | May 14, 02:15 UTC | 35m |
| 2026-05-11 | CSN314 | ICN → PVG | May 11, 03:55 UTC | May 11, 04:20 UTC | 25m |
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-8640 page for operator, model, and routing details .