sensors Mode-S transponder
780B73
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-9959 · AIRBUS A-320
- Hex
- 780B73
- Octal
- 36005563
- Decimal
- 7,867,251
- Country
- CN
- Tail
- B-9959
- Type
- A320
- Flights observed
- 35
- Distinct callsigns
- 17
- Country
- CN
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 780B73 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 17 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CSN6851 | China Southern Airlines | 6 | 2026-05-27 |
| CSN3353 | - | 4 | 2026-05-10 |
| CSN6545 | China Southern Airlines | 3 | 2026-05-29 |
| CSN6541 | China Southern Airlines | 3 | 2026-05-14 |
| CSN6155 | China Southern Airlines | 3 | 2026-05-17 |
| CSN6603 | - | 2 | 2026-04-20 |
| CSN6570 | China Southern Airlines | 2 | 2026-05-05 |
| CSN6852 | China Southern Airlines | 1 | 2026-04-23 |
| CSN6772 | China Southern Airlines | 1 | 2026-04-26 |
| CSN6759 | China Southern Airlines | 1 | 2026-04-13 |
| CSN6377 | China Southern Airlines | 1 | 2026-05-25 |
| CSN6342 | China Southern Airlines | 1 | 2026-04-28 |
| CSN6194 | China Southern Airlines | 1 | 2026-05-20 |
| CSN6146 | China Southern Airlines | 1 | 2026-05-21 |
| CSN5173 | China Southern Airlines | 1 | 2026-04-30 |
| CSN3423 | - | 1 | 2026-04-27 |
| CSN3415 | China Southern Airlines | 1 | 2026-04-22 |
Recent flights last 35
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | CSN6545 | CGQ → HGH | May 29, 00:25 UTC | May 29, 01:00 UTC | 35m |
| 2026-05-28 | CSN6545 | CGQ → HGH | May 28, 00:50 UTC | May 29, 00:25 UTC | 23h 35m |
| 2026-05-27 | CSN6851 | CGQ → CAN | May 27, 07:45 UTC | May 28, 01:00 UTC | 17h 15m |
| 2026-05-27 | CSN6851 | CGQ → CAN | May 27, 03:50 UTC | May 28, 01:00 UTC | 21h 11m |
| 2026-05-25 | CSN6377 | CGQ → CAN | May 25, 12:15 UTC | May 26, 04:24 UTC | 16h 10m |
| 2026-05-22 | CSN6545 | CGQ → HGH | May 22, 00:05 UTC | May 22, 00:50 UTC | 45m |
| 2026-05-21 | CSN6146 | PKX → CGQ | May 21, 03:50 UTC | May 22, 00:50 UTC | 21h 0m |
| 2026-05-20 | CSN6194 | PKX → CGQ | May 20, 09:50 UTC | May 20, 10:00 UTC | 10m |
| 2026-05-17 | CSN6155 | CGQ → PVG | May 17, 07:05 UTC | May 17, 07:50 UTC | 45m |
| 2026-05-14 | CSN6541 | CGQ → PVG | May 14, 01:35 UTC | May 15, 00:45 UTC | 23h 10m |
| 2026-05-13 | CSN6155 | CGQ → PVG | May 13, 07:05 UTC | May 14, 02:10 UTC | 19h 5m |
| 2026-05-10 | CSN3353 | - | May 10, 15:24 UTC | May 10, 15:35 UTC | 10m |
| 2026-05-09 | CSN3353 | - | May 9, 15:20 UTC | May 9, 15:30 UTC | 10m |
| 2026-05-08 | CSN3353 | - | May 8, 15:25 UTC | May 8, 15:35 UTC | 10m |
| 2026-05-08 | - | - | May 8, 05:20 UTC | May 8, 05:39 UTC | 20m |
| 2026-05-07 | - | - | May 7, 03:35 UTC | May 7, 03:45 UTC | 10m |
| 2026-05-06 | CSN6851 | CGQ → CAN | May 6, 03:15 UTC | May 6, 07:50 UTC | 4h 35m |
| 2026-05-05 | CSN6851 | CGQ → CAN | May 5, 10:05 UTC | May 6, 07:50 UTC | 21h 45m |
| 2026-05-05 | CSN6570 | XIY → CGQ | May 5, 06:10 UTC | May 6, 03:35 UTC | 21h 25m |
| 2026-05-04 | CSN6570 | XIY → CGQ | May 4, 06:05 UTC | May 4, 06:25 UTC | 20m |
| 2026-05-03 | CSN6541 | CGQ → PVG | May 3, 01:30 UTC | May 3, 02:15 UTC | 45m |
| 2026-04-30 | CSN5173 | CSX → CGQ | Apr 30, 05:10 UTC | Apr 30, 15:10 UTC | 10h 0m |
| 2026-04-28 | CSN6342 | CAN → CGQ | Apr 28, 08:05 UTC | Apr 28, 08:25 UTC | 20m |
| 2026-04-27 | CSN3423 | - | Apr 27, 03:30 UTC | Apr 27, 03:45 UTC | 15m |
| 2026-04-26 | CSN6772 | CAN → HAK | Apr 26, 14:50 UTC | Apr 26, 15:00 UTC | 10m |
| 2026-04-26 | CSN6851 | CGQ → CAN | Apr 26, 07:10 UTC | Apr 26, 07:35 UTC | 25m |
| 2026-04-25 | CSN6851 | CGQ → CAN | Apr 25, 12:40 UTC | Apr 26, 07:35 UTC | 18h 55m |
| 2026-04-25 | CSN6541 | CGQ → PVG | Apr 25, 01:30 UTC | Apr 25, 02:10 UTC | 40m |
| 2026-04-23 | CSN6852 | CAN → CGQ | Apr 23, 14:35 UTC | Apr 23, 15:00 UTC | 25m |
| 2026-04-22 | CSN3415 | CAN → CKG | Apr 22, 03:30 UTC | Apr 22, 03:45 UTC | 15m |
| 2026-04-21 | CSN3353 | - | Apr 21, 15:10 UTC | Apr 21, 15:20 UTC | 10m |
| 2026-04-20 | CSN6603 | - | Apr 20, 23:15 UTC | Apr 20, 23:30 UTC | 15m |
| 2026-04-17 | CSN6155 | CGQ → PVG | Apr 17, 07:20 UTC | Apr 17, 07:50 UTC | 30m |
| 2026-04-14 | CSN6603 | - | Apr 14, 23:10 UTC | Apr 14, 23:25 UTC | 15m |
| 2026-04-13 | CSN6759 | CAN → SYX | Apr 13, 08:35 UTC | Apr 13, 08:45 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-9959 page for operator, model, and routing details .