sensors Mode-S transponder
78236B
ICAO 24-bit transponder address · allocated to China
- Hex
- 78236B
- Octal
- 36021553
- Decimal
- 7,873,387
- Country
- CN
- Flights observed
- 12
- Distinct callsigns
- 6
- Country
- CN
- Last broadcast
- Jul 26, 15:30 UTC
Last known position
Country allocation
The ICAO 24-bit address 78236B 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 6 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CSN6553 | China Southern Airlines | 5 | 2026-07-24 |
| CSN6358 | China Southern Airlines | 2 | 2026-07-23 |
| CSN6357 | China Southern Airlines | 2 | 2026-07-23 |
| CSN6476 | China Southern Airlines | 1 | 2026-07-26 |
| CSN6378 | - | 1 | 2026-07-21 |
| CSN5682 | - | 1 | 2026-07-14 |
Recent flights last 12
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | CSN6476 | PKX → CGQ | Jul 26, 15:20 UTC | Jul 26, 15:30 UTC | 10m |
| 2026-07-24 | CSN6553 | CGQ → PVG | Jul 24, 14:55 UTC | Jul 25, 10:15 UTC | 19h 20m |
| 2026-07-24 | CSN6553 | CGQ → PVG | Jul 24, 10:50 UTC | Jul 25, 10:15 UTC | 23h 25m |
| 2026-07-24 | CSN6553 | CGQ → PVG | Jul 24, 10:25 UTC | Jul 25, 02:30 UTC | 16h 5m |
| 2026-07-24 | CSN6553 | CGQ → PVG | Jul 24, 02:15 UTC | Jul 24, 15:00 UTC | 12h 45m |
| 2026-07-23 | CSN6553 | CGQ → PVG | Jul 23, 15:00 UTC | Jul 24, 11:05 UTC | 20h 5m |
| 2026-07-23 | CSN6358 | SZX → CGQ | Jul 23, 08:45 UTC | Jul 23, 09:00 UTC | 15m |
| 2026-07-23 | CSN6358 | SZX → CGQ | Jul 23, 06:30 UTC | Jul 23, 06:45 UTC | 15m |
| 2026-07-23 | CSN6357 | CGQ → SZX | Jul 23, 04:25 UTC | Jul 23, 04:40 UTC | 15m |
| 2026-07-23 | CSN6357 | CGQ → SZX | Jul 23, 01:45 UTC | Jul 23, 02:05 UTC | 20m |
| 2026-07-21 | CSN6378 | - | Jul 21, 03:20 UTC | Jul 21, 08:10 UTC | 4h 50m |
| 2026-07-14 | CSN5682 | - | Jul 14, 08:55 UTC | Jul 14, 18:00 UTC | 9h 5m |
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.