sensors Mode-S transponder
78099A
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-5717 · BOEING 737-800
- Hex
- 78099A
- Octal
- 36004632
- Decimal
- 7,866,778
- Country
- CN
- Tail
- B-5717
- Type
- B738
- Flights observed
- 39
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 11h ago
Last known position
Country allocation
The ICAO 24-bit address 78099A 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 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CSN6703 | China Southern Airlines | 8 | 2026-06-02 |
| CSN6704 | China Southern Airlines | 7 | 2026-06-02 |
| CSN5147 | China Southern Airlines | 3 | 2026-05-22 |
| CSN8539 | - | 2 | 2026-05-10 |
| CSN3885 | - | 2 | 2026-04-20 |
| CSN3795 | China Southern Airlines | 2 | 2026-05-21 |
| CSN8356 | - | 1 | 2026-04-30 |
| CSN8355 | - | 1 | 2026-04-29 |
| CSN6195 | - | 1 | 2026-05-29 |
| CSN3886 | China Southern Airlines | 1 | 2026-04-21 |
| CSN3884 | China Southern Airlines | 1 | 2026-04-19 |
| CSN3883 | China Southern Airlines | 1 | 2026-05-23 |
| CSN3876 | China Southern Airlines | 1 | 2026-05-24 |
| CSN3875 | China Southern Airlines | 1 | 2026-05-24 |
| CSN3866 | - | 1 | 2026-05-15 |
| CSN3865 | - | 1 | 2026-04-23 |
| CSN3857 | - | 1 | 2026-05-09 |
| CSN3825 | China Southern Airlines | 1 | 2026-05-12 |
| CSN3796 | China Southern Airlines | 1 | 2026-04-19 |
| CSN3274 | China Southern Airlines | 1 | 2026-05-28 |
Recent flights last 39
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-02 | CSN6704 | ZUH → YIW | Jun 2, 08:30 UTC | Jun 2, 08:45 UTC | 15m |
| 2026-06-02 | CSN6703 | YIW → ZUH | Jun 2, 02:45 UTC | Jun 2, 03:20 UTC | 35m |
| 2026-05-29 | CSN6195 | - | May 29, 23:40 UTC | May 30, 03:45 UTC | 4h 5m |
| 2026-05-28 | CSN3274 | SZX → NNG | May 28, 13:55 UTC | May 28, 14:20 UTC | 25m |
| 2026-05-28 | CSN3273 | NNG → SZX | May 28, 10:20 UTC | May 28, 10:45 UTC | 25m |
| 2026-05-24 | CSN3876 | SZX → YIW | May 24, 05:30 UTC | May 24, 06:20 UTC | 50m |
| 2026-05-24 | CSN3875 | YIW → SZX | May 24, 00:40 UTC | May 24, 01:00 UTC | 20m |
| 2026-05-23 | CSN3883 | CAN → YIW | May 23, 03:25 UTC | May 23, 03:35 UTC | 10m |
| 2026-05-22 | CSN5147 | YIW → HAK | May 22, 08:05 UTC | May 22, 12:15 UTC | 4h 10m |
| 2026-05-21 | CSN5147 | YIW → HAK | May 21, 09:00 UTC | May 22, 08:20 UTC | 23h 20m |
| 2026-05-21 | CSN3795 | CAN → YIW | May 21, 08:00 UTC | May 21, 08:10 UTC | 10m |
| 2026-05-17 | CSN6704 | ZUH → YIW | May 17, 10:10 UTC | May 17, 10:20 UTC | 10m |
| 2026-05-17 | CSN6703 | YIW → ZUH | May 17, 01:40 UTC | May 17, 01:55 UTC | 15m |
| 2026-05-15 | CSN3866 | - | May 15, 16:00 UTC | May 16, 06:16 UTC | 14h 16m |
| 2026-05-12 | CSN3825 | WUH → TAO | May 12, 07:55 UTC | May 12, 08:10 UTC | 15m |
| 2026-05-11 | CSN6704 | ZUH → YIW | May 11, 08:30 UTC | May 11, 08:40 UTC | 10m |
| 2026-05-11 | CSN6703 | YIW → ZUH | May 11, 01:30 UTC | May 11, 01:50 UTC | 20m |
| 2026-05-10 | CSN8539 | - | May 10, 07:40 UTC | May 10, 12:34 UTC | 4h 55m |
| 2026-05-09 | CSN3857 | - | May 9, 23:44 UTC | May 10, 04:29 UTC | 4h 45m |
| 2026-05-08 | CSN8539 | - | May 8, 06:50 UTC | May 8, 11:40 UTC | 4h 50m |
| 2026-05-02 | CSN6704 | ZUH → YIW | May 2, 08:35 UTC | May 2, 08:45 UTC | 10m |
| 2026-05-02 | CSN6703 | YIW → ZUH | May 2, 00:50 UTC | May 2, 01:00 UTC | 10m |
| 2026-05-01 | CSN5147 | YIW → HAK | May 1, 07:50 UTC | May 1, 11:10 UTC | 3h 20m |
| 2026-04-30 | CSN8356 | - | Apr 30, 05:50 UTC | Apr 30, 08:00 UTC | 2h 10m |
| 2026-04-29 | CSN8355 | - | Apr 29, 09:10 UTC | Apr 30, 04:25 UTC | 19h 14m |
| 2026-04-24 | CSN6704 | ZUH → YIW | Apr 24, 09:50 UTC | Apr 24, 10:00 UTC | 10m |
| 2026-04-24 | CSN6703 | YIW → ZUH | Apr 24, 01:35 UTC | Apr 24, 01:55 UTC | 20m |
| 2026-04-23 | CSN3865 | - | Apr 23, 00:50 UTC | Apr 23, 06:20 UTC | 5h 30m |
| 2026-04-21 | CSN3886 | CAN → YIW | Apr 21, 14:15 UTC | Apr 21, 14:25 UTC | 10m |
| 2026-04-21 | CSN6703 | YIW → ZUH | Apr 21, 00:50 UTC | Apr 21, 01:05 UTC | 15m |
| 2026-04-20 | CSN3885 | - | Apr 20, 14:25 UTC | Apr 20, 14:35 UTC | 10m |
| 2026-04-20 | CSN3795 | CAN → YIW | Apr 20, 07:40 UTC | Apr 20, 07:50 UTC | 10m |
| 2026-04-19 | CSN3884 | YIW → CAN | Apr 19, 07:15 UTC | Apr 19, 07:25 UTC | 10m |
| 2026-04-19 | CSN3796 | YIW → CAN | Apr 19, 01:00 UTC | Apr 19, 01:10 UTC | 10m |
| 2026-04-18 | CSN6704 | ZUH → YIW | Apr 18, 08:35 UTC | Apr 18, 08:45 UTC | 10m |
| 2026-04-18 | CSN6703 | YIW → ZUH | Apr 18, 00:55 UTC | Apr 18, 01:10 UTC | 15m |
| 2026-04-17 | CSN3885 | - | Apr 17, 12:40 UTC | Apr 17, 13:15 UTC | 35m |
| 2026-04-17 | CSN6704 | ZUH → YIW | Apr 17, 08:25 UTC | Apr 17, 08:40 UTC | 15m |
| 2026-04-17 | CSN6703 | YIW → ZUH | Apr 17, 02:00 UTC | Apr 17, 02:15 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-5717 page for operator, model, and routing details .