sensors Mode-S transponder
781DC4
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-329W · AIRBUS A-320
- Hex
- 781DC4
- Octal
- 36016704
- Decimal
- 7,871,940
- Country
- CN
- Tail
- B-329W
- Type
- A320
- Flights observed
- 27
- Distinct callsigns
- 16
- Country
- CN
- Last broadcast
- 20h ago
Last known position
Country allocation
The ICAO 24-bit address 781DC4 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 16 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| UEA2713 | United Eagle Airlines | 5 | 2026-04-30 |
| UEA1870 | - | 3 | 2026-04-27 |
| UEA1823 | - | 3 | 2026-05-05 |
| UEA2714 | United Eagle Airlines | 2 | 2026-05-03 |
| UEA2288 | - | 2 | 2026-05-16 |
| UEA1869 | - | 2 | 2026-04-27 |
| UEA2757 | United Eagle Airlines | 1 | 2026-05-02 |
| UEA2720 | United Eagle Airlines | 1 | 2026-05-07 |
| UEA2442 | United Eagle Airlines | 1 | 2026-05-03 |
| UEA2404 | - | 1 | 2026-06-03 |
| UEA2264 | United Eagle Airlines | 1 | 2026-05-19 |
| UEA2244 | - | 1 | 2026-04-26 |
| UEA2218 | United Eagle Airlines | 1 | 2026-05-23 |
| UEA2217 | United Eagle Airlines | 1 | 2026-05-23 |
| UEA1844 | - | 1 | 2026-05-31 |
| UEA1843 | - | 1 | 2026-05-31 |
Recent flights last 27
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-03 | UEA2404 | - | Jun 3, 05:00 UTC | Jun 3, 05:25 UTC | 25m |
| 2026-05-31 | UEA1844 | - | May 31, 12:50 UTC | May 31, 13:20 UTC | 30m |
| 2026-05-31 | UEA1843 | - | May 31, 11:10 UTC | May 31, 11:20 UTC | 10m |
| 2026-05-23 | UEA2218 | SZX → CTU | May 23, 04:05 UTC | May 23, 04:20 UTC | 15m |
| 2026-05-23 | UEA2217 | CTU → SZX | May 23, 02:20 UTC | May 23, 02:40 UTC | 19m |
| 2026-05-19 | UEA2264 | HGH → HAK | May 19, 06:10 UTC | May 19, 06:55 UTC | 45m |
| 2026-05-16 | UEA2288 | - | May 16, 03:25 UTC | May 16, 06:55 UTC | 3h 31m |
| 2026-05-09 | UEA2288 | - | May 9, 03:20 UTC | May 9, 07:10 UTC | 3h 50m |
| 2026-05-07 | UEA2720 | ZUH → TFU | May 7, 13:10 UTC | May 7, 13:30 UTC | 20m |
| 2026-05-05 | UEA1823 | - | May 5, 02:40 UTC | May 5, 12:45 UTC | 10h 5m |
| 2026-05-04 | UEA1823 | - | May 4, 06:10 UTC | May 5, 03:05 UTC | 20h 56m |
| 2026-05-03 | UEA2442 | CSX → SHE | May 3, 13:30 UTC | May 4, 06:30 UTC | 17h 0m |
| 2026-05-03 | UEA2714 | SYX → HFE | May 3, 09:30 UTC | May 4, 06:30 UTC | 21h 0m |
| 2026-05-03 | UEA2714 | SYX → HFE | May 3, 01:30 UTC | May 3, 13:35 UTC | 12h 4m |
| 2026-05-02 | UEA2757 | CTU → SHE | May 2, 14:00 UTC | May 3, 09:45 UTC | 19h 44m |
| 2026-04-30 | UEA2713 | SHE → HFE | Apr 30, 01:30 UTC | Apr 30, 13:25 UTC | 11h 55m |
| 2026-04-29 | UEA2713 | SHE → HFE | Apr 29, 14:20 UTC | Apr 30, 09:30 UTC | 19h 9m |
| 2026-04-29 | UEA2713 | SHE → HFE | Apr 29, 06:00 UTC | Apr 30, 01:40 UTC | 19h 40m |
| 2026-04-29 | UEA2713 | SHE → HFE | Apr 29, 01:35 UTC | Apr 29, 14:30 UTC | 12h 56m |
| 2026-04-28 | UEA2713 | SHE → HFE | Apr 28, 10:10 UTC | Apr 29, 06:05 UTC | 19h 55m |
| 2026-04-27 | UEA1870 | - | Apr 27, 13:50 UTC | Apr 28, 10:10 UTC | 20h 20m |
| 2026-04-27 | UEA1869 | - | Apr 27, 00:20 UTC | Apr 27, 14:05 UTC | 13h 45m |
| 2026-04-26 | UEA2244 | - | Apr 26, 06:20 UTC | Apr 26, 06:35 UTC | 15m |
| 2026-04-21 | UEA1823 | - | Apr 21, 02:45 UTC | Apr 21, 12:35 UTC | 9h 50m |
| 2026-04-15 | UEA1870 | - | Apr 15, 14:05 UTC | Apr 15, 14:20 UTC | 15m |
| 2026-04-15 | UEA1870 | - | Apr 15, 10:35 UTC | Apr 15, 10:55 UTC | 20m |
| 2026-04-15 | UEA1869 | - | Apr 15, 07:25 UTC | Apr 15, 07:50 UTC | 25m |
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-329W page for operator, model, and routing details .