sensors Mode-S transponder
7823A6
ICAO 24-bit transponder address · allocated to China
- Hex
- 7823A6
- Octal
- 36021646
- Decimal
- 7,873,446
- Country
- CN
- Flights observed
- 32
- Distinct callsigns
- 12
- Country
- CN
- Last broadcast
- 19d ago
Last known position
Country allocation
The ICAO 24-bit address 7823A6 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 |
|---|---|---|---|
| CSN690 | - | 4 | 2026-07-20 |
| CSN5093 | China Southern Airlines | 4 | 2026-07-24 |
| CSN304 | China Southern Airlines | 4 | 2026-07-23 |
| CSN303 | China Southern Airlines | 4 | 2026-07-23 |
| CSN689 | - | 3 | 2026-07-19 |
| CSN653 | - | 3 | 2026-07-18 |
| CSN5094 | China Southern Airlines | 3 | 2026-07-25 |
| BOE747 | - | 2 | 2026-06-25 |
| BOE294 | - | 2 | 2026-06-29 |
| CSN654 | - | 1 | 2026-07-18 |
| CSN5681 | - | 1 | 2026-06-30 |
| CSN3082 | China Southern Airlines | 1 | 2026-07-26 |
Recent flights last 32
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | CSN3082 | BKK → CAN | Jul 26, 09:15 UTC | Jul 26, 10:45 UTC | 1h 30m |
| 2026-07-25 | CSN5094 | ICN → CSX | Jul 25, 11:35 UTC | Jul 26, 07:00 UTC | 19h 26m |
| 2026-07-25 | CSN5094 | ICN → CSX | Jul 25, 11:15 UTC | Jul 26, 07:00 UTC | 19h 46m |
| 2026-07-24 | CSN5093 | CSX → ICN | Jul 24, 19:15 UTC | Jul 25, 05:10 UTC | 9h 55m |
| 2026-07-24 | CSN5093 | CSX → ICN | Jul 24, 03:35 UTC | Jul 25, 01:45 UTC | 22h 10m |
| 2026-07-24 | CSN5093 | CSX → ICN | Jul 24, 03:00 UTC | Jul 25, 01:30 UTC | 22h 30m |
| 2026-07-23 | CSN304 | LHR → CAN | Jul 23, 23:35 UTC | Jul 24, 22:55 UTC | 23h 20m |
| 2026-07-23 | CSN304 | LHR → CAN | Jul 23, 21:35 UTC | Jul 24, 19:20 UTC | 21h 45m |
| 2026-07-23 | CSN304 | LHR → CAN | Jul 23, 21:15 UTC | Jul 24, 19:20 UTC | 22h 5m |
| 2026-07-23 | CSN303 | CAN → LHR | Jul 23, 10:40 UTC | Jul 23, 17:10 UTC | 6h 30m |
| 2026-07-21 | CSN304 | LHR → CAN | Jul 21, 21:30 UTC | Jul 22, 03:55 UTC | 6h 25m |
| 2026-07-21 | CSN303 | - | Jul 21, 11:35 UTC | Jul 21, 18:30 UTC | 6h 55m |
| 2026-07-20 | CSN303 | - | Jul 20, 17:35 UTC | Jul 21, 17:30 UTC | 23h 55m |
| 2026-07-20 | CSN303 | - | Jul 20, 16:55 UTC | Jul 21, 15:20 UTC | 22h 24m |
| 2026-07-20 | CSN690 | - | Jul 20, 13:35 UTC | Jul 21, 12:20 UTC | 22h 45m |
| 2026-07-20 | CSN690 | - | Jul 20, 11:10 UTC | Jul 20, 17:35 UTC | 6h 25m |
| 2026-07-19 | CSN689 | CAN → LGW | Jul 19, 22:20 UTC | Jul 20, 05:15 UTC | 6h 55m |
| 2026-07-19 | CSN689 | - | Jul 19, 02:10 UTC | Jul 20, 01:30 UTC | 23h 20m |
| 2026-07-18 | CSN654 | - | Jul 18, 20:35 UTC | Jul 19, 02:45 UTC | 6h 10m |
| 2026-07-18 | CSN653 | - | Jul 18, 09:50 UTC | Jul 18, 16:50 UTC | 7h 0m |
| 2026-07-17 | CSN653 | - | Jul 17, 16:29 UTC | Jul 18, 15:30 UTC | 23h 1m |
| 2026-07-17 | CSN653 | - | Jul 17, 14:15 UTC | Jul 18, 13:25 UTC | 23h 11m |
| 2026-07-17 | CSN690 | - | Jul 17, 11:35 UTC | Jul 18, 10:35 UTC | 23h 1m |
| 2026-07-17 | CSN690 | - | Jul 17, 10:40 UTC | Jul 17, 17:09 UTC | 6h 30m |
| 2026-07-16 | CSN689 | - | Jul 16, 22:15 UTC | Jul 17, 05:04 UTC | 6h 50m |
| 2026-07-11 | CSN5094 | - | Jul 11, 10:30 UTC | Jul 11, 17:00 UTC | 6h 30m |
| 2026-07-10 | CSN5093 | - | Jul 10, 22:45 UTC | Jul 11, 05:15 UTC | 6h 30m |
| 2026-06-30 | CSN5681 | - | Jun 30, 23:50 UTC | Jul 1, 10:50 UTC | 11h 0m |
| 2026-06-29 | BOE294 | - | Jun 29, 18:10 UTC | Jun 29, 18:39 UTC | 30m |
| 2026-06-29 | BOE294 | - | Jun 29, 16:59 UTC | Jun 29, 17:19 UTC | 20m |
| 2026-06-25 | BOE747 | - | Jun 25, 16:50 UTC | Jun 25, 19:54 UTC | 3h 5m |
| 2026-06-13 | BOE747 | - | Jun 13, 20:55 UTC | Jun 14, 01:35 UTC | 4h 40m |
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.