sensors Mode-S transponder
781F05
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-91A1 · COMAC ARJ-21-700 Xiangfeng
- Hex
- 781F05
- Octal
- 36017405
- Decimal
- 7,872,261
- Country
- CN
- Tail
- B-91A1
- Type
- AJ27
- Flights observed
- 35
- Distinct callsigns
- 18
- Country
- CN
- Last broadcast
- 22h ago
Last known position
Country allocation
The ICAO 24-bit address 781F05 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 18 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CSN5183 | - | 4 | 2026-07-03 |
| CSN3825 | - | 4 | 2026-06-27 |
| CSN5137 | - | 3 | 2026-07-07 |
| CSN3865 | - | 3 | 2026-06-01 |
| CSN3859 | - | 3 | 2026-06-05 |
| CSN8549 | - | 2 | 2026-06-23 |
| CSN5913 | - | 2 | 2026-07-16 |
| CSN5730 | - | 2 | 2026-05-20 |
| CSN5729 | - | 2 | 2026-06-04 |
| CSN3860 | - | 2 | 2026-07-17 |
| CSN8793 | China Southern Airlines | 1 | 2026-05-05 |
| CSN8550 | - | 1 | 2026-05-07 |
| CSN6196 | - | 1 | 2026-04-20 |
| CSN6195 | - | 1 | 2026-06-09 |
| CSN5914 | - | 1 | 2026-04-22 |
| CSN513R | - | 1 | 2026-07-08 |
| CSN3866 | - | 1 | 2026-04-14 |
| CSN3852 | - | 1 | 2026-06-25 |
Recent flights last 35
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-17 | CSN3860 | - | Jul 17, 02:05 UTC | Jul 17, 06:45 UTC | 4h 40m |
| 2026-07-16 | CSN3860 | - | Jul 16, 10:45 UTC | Jul 17, 06:45 UTC | 20h 0m |
| 2026-07-16 | CSN5913 | - | Jul 16, 05:35 UTC | Jul 17, 02:05 UTC | 20h 30m |
| 2026-07-08 | CSN513R | - | Jul 8, 09:20 UTC | Jul 8, 11:40 UTC | 2h 20m |
| 2026-07-07 | CSN5137 | - | Jul 7, 11:55 UTC | Jul 8, 09:30 UTC | 21h 35m |
| 2026-07-03 | CSN5183 | - | Jul 3, 07:45 UTC | Jul 3, 11:55 UTC | 4h 10m |
| 2026-06-30 | CSN5183 | - | Jun 30, 15:15 UTC | Jul 1, 07:55 UTC | 16h 40m |
| 2026-06-30 | CSN5137 | - | Jun 30, 12:20 UTC | Jul 1, 07:55 UTC | 19h 35m |
| 2026-06-28 | CSN5183 | - | Jun 28, 07:29 UTC | Jun 28, 11:50 UTC | 4h 20m |
| 2026-06-27 | CSN3825 | - | Jun 27, 07:59 UTC | Jun 27, 08:14 UTC | 15m |
| 2026-06-26 | CSN3825 | - | Jun 26, 11:09 UTC | Jun 27, 08:14 UTC | 21h 5m |
| 2026-06-25 | CSN3852 | - | Jun 25, 07:00 UTC | Jun 25, 07:25 UTC | 25m |
| 2026-06-24 | CSN3825 | - | Jun 24, 07:20 UTC | Jun 25, 07:15 UTC | 23h 55m |
| 2026-06-23 | CSN3825 | - | Jun 23, 10:19 UTC | Jun 24, 07:30 UTC | 21h 10m |
| 2026-06-23 | CSN8549 | - | Jun 23, 06:15 UTC | Jun 23, 10:24 UTC | 4h 10m |
| 2026-06-18 | CSN5137 | - | Jun 18, 09:50 UTC | Jun 18, 15:10 UTC | 5h 20m |
| 2026-06-09 | CSN6195 | - | Jun 9, 23:45 UTC | Jun 10, 03:40 UTC | 3h 55m |
| 2026-06-05 | CSN3859 | - | Jun 5, 00:15 UTC | Jun 5, 05:20 UTC | 5h 5m |
| 2026-06-04 | CSN5729 | - | Jun 4, 01:05 UTC | Jun 4, 06:10 UTC | 5h 5m |
| 2026-06-01 | CSN3865 | - | Jun 1, 00:35 UTC | Jun 1, 06:45 UTC | 6h 10m |
| 2026-05-27 | CSN5183 | - | May 27, 07:30 UTC | May 27, 11:50 UTC | 4h 20m |
| 2026-05-20 | CSN5730 | - | May 20, 05:30 UTC | May 20, 05:45 UTC | 15m |
| 2026-05-07 | CSN8550 | - | May 7, 06:30 UTC | May 7, 10:45 UTC | 4h 15m |
| 2026-05-06 | CSN3865 | - | May 6, 00:46 UTC | May 6, 06:20 UTC | 5h 35m |
| 2026-05-05 | CSN8793 | ZUH → PKX | May 5, 07:30 UTC | May 6, 06:20 UTC | 22h 50m |
| 2026-05-04 | CSN3865 | - | May 4, 00:45 UTC | May 4, 06:00 UTC | 5h 15m |
| 2026-05-01 | CSN3859 | - | May 1, 00:10 UTC | May 1, 05:20 UTC | 5h 10m |
| 2026-04-29 | CSN5730 | - | Apr 29, 01:15 UTC | Apr 29, 08:40 UTC | 7h 25m |
| 2026-04-24 | CSN3859 | - | Apr 24, 01:35 UTC | Apr 24, 06:10 UTC | 4h 35m |
| 2026-04-22 | CSN5914 | - | Apr 22, 10:40 UTC | Apr 22, 11:00 UTC | 20m |
| 2026-04-22 | CSN5913 | - | Apr 22, 05:55 UTC | Apr 22, 06:10 UTC | 15m |
| 2026-04-20 | CSN6196 | - | Apr 20, 23:50 UTC | Apr 21, 05:00 UTC | 5h 10m |
| 2026-04-18 | CSN8549 | - | Apr 18, 23:40 UTC | Apr 19, 10:15 UTC | 10h 35m |
| 2026-04-18 | CSN5729 | - | Apr 18, 01:25 UTC | Apr 18, 01:35 UTC | 10m |
| 2026-04-14 | CSN3866 | - | Apr 14, 06:05 UTC | Apr 14, 06:25 UTC | 20m |
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-91A1 page for operator, model, and routing details .