sensors Mode-S transponder
78213D
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-657K · COMAC ARJ-21-700 Xiangfeng
- Hex
- 78213D
- Octal
- 36020475
- Decimal
- 7,872,829
- Country
- CN
- Tail
- B-657K
- Type
- AJ27
- Flights observed
- 17
- Distinct callsigns
- 9
- Country
- CN
- Last broadcast
- 5d ago
Last known position
Country allocation
The ICAO 24-bit address 78213D 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 9 distinct
Recent flights last 17
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-22 | CSN5775 | - | Jun 22, 02:45 UTC | Jun 22, 07:40 UTC | 4h 55m |
| 2026-06-19 | CSN5729 | - | Jun 19, 01:15 UTC | Jun 19, 05:24 UTC | 4h 10m |
| 2026-06-17 | CSN5137 | - | Jun 17, 12:05 UTC | Jun 18, 03:35 UTC | 15h 30m |
| 2026-06-15 | CSN5729 | - | Jun 15, 01:15 UTC | Jun 15, 05:20 UTC | 4h 5m |
| 2026-06-14 | CSN5729 | - | Jun 14, 01:20 UTC | Jun 15, 01:15 UTC | 23h 55m |
| 2026-06-05 | CSN5137 | SYX → URC | Jun 5, 12:30 UTC | Jun 5, 15:30 UTC | 3h 0m |
| 2026-06-02 | CSN5137 | SYX → URC | Jun 2, 11:45 UTC | Jun 2, 12:45 UTC | 1h 0m |
| 2026-06-01 | CSN8550 | - | Jun 1, 06:05 UTC | Jun 1, 10:30 UTC | 4h 25m |
| 2026-05-27 | CSN5775 | PVG → TFU | May 27, 02:54 UTC | May 27, 08:00 UTC | 5h 5m |
| 2026-05-24 | CSN3825 | WUH → TAO | May 24, 07:20 UTC | May 24, 16:05 UTC | 8h 45m |
| 2026-05-19 | CSN5184 | - | May 19, 07:20 UTC | May 19, 12:10 UTC | 4h 50m |
| 2026-05-13 | CSN5183 | - | May 13, 08:35 UTC | May 13, 08:50 UTC | 15m |
| 2026-05-12 | CSN6195 | - | May 12, 23:45 UTC | May 13, 03:50 UTC | 4h 5m |
| 2026-05-12 | CSN6195 | - | May 12, 06:35 UTC | May 13, 03:50 UTC | 21h 15m |
| 2026-04-30 | CSN3894 | - | Apr 30, 02:00 UTC | Apr 30, 02:15 UTC | 15m |
| 2026-04-19 | CSN3894 | - | Apr 19, 02:15 UTC | Apr 19, 02:35 UTC | 20m |
| 2026-04-18 | CSN3894 | - | Apr 18, 02:15 UTC | Apr 18, 02:30 UTC | 15m |
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-657K page for operator, model, and routing details .