sensors Mode-S transponder
781DA2
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-329F · AIRBUS A-320neo
- Hex
- 781DA2
- Octal
- 36016642
- Decimal
- 7,871,906
- Country
- CN
- Tail
- B-329F
- Type
- A20N
- Flights observed
- 30
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 13d ago
Last known position
Country allocation
The ICAO 24-bit address 781DA2 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 |
|---|---|---|---|
| HXA4839 | China Express Airlines | 4 | 2026-07-25 |
| HXA4140 | China Express Airlines | 3 | 2026-06-13 |
| HXA4630 | China Express Airlines | 2 | 2026-07-21 |
| HXA4110 | China Express Airlines | 2 | 2026-07-25 |
| HXA4028 | - | 2 | 2026-06-12 |
| HXA4027 | - | 2 | 2026-06-12 |
| HXA2926 | - | 2 | 2026-06-09 |
| HXA4840 | China Express Airlines | 1 | 2026-06-20 |
| HXA4629 | - | 1 | 2026-07-21 |
| HXA4318 | - | 1 | 2026-07-14 |
| HXA427V | - | 1 | 2026-06-19 |
| HXA4228 | - | 1 | 2026-07-10 |
| HXA4220 | - | 1 | 2026-07-24 |
| HXA4218 | - | 1 | 2026-06-24 |
| HXA4217 | - | 1 | 2026-06-24 |
| HXA4095 | - | 1 | 2026-07-08 |
| HXA4018 | - | 1 | 2026-07-12 |
| HXA2925 | - | 1 | 2026-06-09 |
| HXA2904 | - | 1 | 2026-06-08 |
| HXA2704 | China Express Airlines | 1 | 2026-05-09 |
Recent flights last 30
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | HXA4110 | NDG → TSN | Jul 25, 11:40 UTC | Jul 25, 11:50 UTC | 10m |
| 2026-07-25 | HXA4839 | SJW → NDG | Jul 25, 07:40 UTC | Jul 25, 08:00 UTC | 20m |
| 2026-07-25 | HXA4839 | SJW → NDG | Jul 25, 02:35 UTC | Jul 25, 02:45 UTC | 10m |
| 2026-07-24 | HXA4220 | - | Jul 24, 15:20 UTC | Jul 24, 15:30 UTC | 10m |
| 2026-07-21 | HXA4630 | TNA → TGO | Jul 21, 04:45 UTC | Jul 21, 05:00 UTC | 15m |
| 2026-07-21 | HXA4629 | - | Jul 21, 01:55 UTC | Jul 21, 02:05 UTC | 10m |
| 2026-07-14 | HXA4318 | - | Jul 14, 10:50 UTC | Jul 14, 11:00 UTC | 10m |
| 2026-07-14 | HXA4110 | - | Jul 14, 08:35 UTC | Jul 14, 08:45 UTC | 10m |
| 2026-07-13 | HXA4839 | - | Jul 13, 14:00 UTC | Jul 14, 04:40 UTC | 14h 40m |
| 2026-07-12 | HXA4018 | - | Jul 12, 11:50 UTC | Jul 12, 14:05 UTC | 2h 15m |
| 2026-07-10 | HXA4228 | - | Jul 10, 05:40 UTC | Jul 10, 05:55 UTC | 15m |
| 2026-07-08 | HXA4095 | - | Jul 8, 10:00 UTC | Jul 8, 13:15 UTC | 3h 15m |
| 2026-06-25 | HXA4839 | SJW → NDG | Jun 25, 04:20 UTC | Jun 25, 04:29 UTC | 10m |
| 2026-06-24 | HXA4218 | - | Jun 24, 05:54 UTC | Jun 24, 06:10 UTC | 15m |
| 2026-06-24 | HXA4217 | - | Jun 24, 01:14 UTC | Jun 24, 01:24 UTC | 10m |
| 2026-06-20 | HXA4840 | SJW → TFU | Jun 20, 03:39 UTC | Jun 20, 03:49 UTC | 10m |
| 2026-06-19 | HXA427V | - | Jun 19, 02:50 UTC | Jun 19, 03:09 UTC | 20m |
| 2026-06-13 | HXA4140 | SZX → HDG | Jun 13, 07:05 UTC | Jun 13, 07:20 UTC | 15m |
| 2026-06-12 | HXA4028 | - | Jun 12, 14:20 UTC | Jun 12, 14:35 UTC | 15m |
| 2026-06-12 | HXA4027 | - | Jun 12, 12:00 UTC | Jun 12, 12:10 UTC | 10m |
| 2026-06-09 | HXA2926 | - | Jun 9, 05:55 UTC | Jun 9, 06:10 UTC | 15m |
| 2026-06-09 | HXA2925 | - | Jun 9, 01:30 UTC | Jun 9, 01:40 UTC | 10m |
| 2026-06-08 | HXA4028 | - | Jun 8, 16:50 UTC | Jun 8, 17:05 UTC | 15m |
| 2026-06-08 | HXA4027 | - | Jun 8, 14:40 UTC | Jun 8, 14:50 UTC | 10m |
| 2026-06-08 | HXA2904 | - | Jun 8, 06:15 UTC | Jun 8, 06:25 UTC | 10m |
| 2026-06-07 | HXA4630 | TNA → TGO | Jun 7, 13:05 UTC | Jun 8, 03:50 UTC | 14h 45m |
| 2026-05-23 | HXA4140 | SZX → HDG | May 23, 06:50 UTC | May 23, 07:10 UTC | 20m |
| 2026-05-12 | HXA4140 | SZX → HDG | May 12, 06:05 UTC | May 12, 06:25 UTC | 20m |
| 2026-05-09 | HXA2704 | TGO → HET | May 9, 05:30 UTC | May 9, 05:40 UTC | 10m |
| 2026-05-07 | HXA2926 | - | May 7, 05:00 UTC | May 7, 09:55 UTC | 4h 55m |
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-329F page for operator, model, and routing details .