sensors Mode-S transponder
781F5B
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-32E8 · AIRBUS A-320neo
- Hex
- 781F5B
- Octal
- 36017533
- Decimal
- 7,872,347
- Country
- CN
- Tail
- B-32E8
- Type
- A20N
- Flights observed
- 29
- Distinct callsigns
- 19
- Country
- CN
- Last broadcast
- Jul 24, 14:40 UTC
Last known position
Country allocation
The ICAO 24-bit address 781F5B 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 19 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| HXA4840 | - | 3 | 2026-07-11 |
| HXA4218 | - | 3 | 2026-07-19 |
| HXA4590 | China Express Airlines | 2 | 2026-07-24 |
| HXA4589 | China Express Airlines | 2 | 2026-06-28 |
| HXA4550 | - | 2 | 2026-07-16 |
| HXA4549 | - | 2 | 2026-07-16 |
| HXA4241 | - | 2 | 2026-05-02 |
| HXA4095 | - | 2 | 2026-06-24 |
| HXA4940 | - | 1 | 2026-07-20 |
| HXA4939 | China Express Airlines | 1 | 2026-07-20 |
| HXA4630 | - | 1 | 2026-07-14 |
| HXA4629 | - | 1 | 2026-07-14 |
| HXA4274 | - | 1 | 2026-06-23 |
| HXA4217 | - | 1 | 2026-05-22 |
| HXA4163 | - | 1 | 2026-07-10 |
| HXA4140 | China Express Airlines | 1 | 2026-04-16 |
| HXA4028 | - | 1 | 2026-07-13 |
| HXA4027 | - | 1 | 2026-07-13 |
| HXA2926 | - | 1 | 2026-04-25 |
Recent flights last 29
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-24 | HXA4590 | BPE → XIY | Jul 24, 11:50 UTC | Jul 24, 14:40 UTC | 2h 50m |
| 2026-07-20 | HXA4590 | BPE → XIY | Jul 20, 16:50 UTC | Jul 21, 03:10 UTC | 10h 20m |
| 2026-07-20 | HXA4940 | - | Jul 20, 04:00 UTC | Jul 20, 04:10 UTC | 10m |
| 2026-07-20 | HXA4939 | TFU → SJW | Jul 20, 02:25 UTC | Jul 20, 02:35 UTC | 10m |
| 2026-07-19 | HXA4218 | - | Jul 19, 05:30 UTC | Jul 20, 02:35 UTC | 21h 5m |
| 2026-07-19 | HXA4218 | - | Jul 19, 01:25 UTC | Jul 19, 05:45 UTC | 4h 20m |
| 2026-07-16 | HXA4550 | - | Jul 16, 04:10 UTC | Jul 16, 04:30 UTC | 20m |
| 2026-07-16 | HXA4549 | - | Jul 16, 02:30 UTC | Jul 16, 02:40 UTC | 10m |
| 2026-07-14 | HXA4630 | - | Jul 14, 05:00 UTC | Jul 14, 05:20 UTC | 20m |
| 2026-07-14 | HXA4629 | - | Jul 14, 02:00 UTC | Jul 14, 02:10 UTC | 10m |
| 2026-07-13 | HXA4028 | - | Jul 13, 03:45 UTC | Jul 13, 04:00 UTC | 15m |
| 2026-07-13 | HXA4027 | - | Jul 13, 01:25 UTC | Jul 13, 01:35 UTC | 10m |
| 2026-07-11 | HXA4840 | - | Jul 11, 04:05 UTC | Jul 11, 04:20 UTC | 15m |
| 2026-07-10 | HXA4163 | - | Jul 10, 09:30 UTC | Jul 10, 10:00 UTC | 30m |
| 2026-06-28 | HXA4589 | XIY → BPE | Jun 28, 12:15 UTC | Jun 28, 14:50 UTC | 2h 35m |
| 2026-06-26 | HXA4589 | XIY → BPE | Jun 26, 11:49 UTC | Jun 26, 13:59 UTC | 2h 10m |
| 2026-06-24 | HXA4095 | - | Jun 24, 09:19 UTC | Jun 24, 12:20 UTC | 3h 0m |
| 2026-06-23 | HXA4274 | - | Jun 23, 12:20 UTC | Jun 23, 12:35 UTC | 15m |
| 2026-06-19 | HXA4218 | - | Jun 19, 06:39 UTC | Jun 19, 06:49 UTC | 10m |
| 2026-06-13 | HXA4550 | - | Jun 13, 04:45 UTC | Jun 13, 05:00 UTC | 15m |
| 2026-06-13 | HXA4549 | - | Jun 13, 03:20 UTC | Jun 13, 03:35 UTC | 15m |
| 2026-05-22 | HXA4217 | - | May 22, 01:20 UTC | May 22, 01:30 UTC | 10m |
| 2026-05-09 | HXA4840 | SJW → TFU | May 9, 03:35 UTC | May 9, 03:45 UTC | 10m |
| 2026-05-02 | HXA4241 | - | May 2, 11:10 UTC | May 2, 11:25 UTC | 15m |
| 2026-04-27 | HXA4241 | - | Apr 27, 13:40 UTC | Apr 28, 12:10 UTC | 22h 30m |
| 2026-04-27 | HXA4095 | - | Apr 27, 10:45 UTC | Apr 27, 13:45 UTC | 3h 0m |
| 2026-04-25 | HXA2926 | - | Apr 25, 06:20 UTC | Apr 25, 06:35 UTC | 15m |
| 2026-04-21 | HXA4840 | SJW → TFU | Apr 21, 04:00 UTC | Apr 21, 04:10 UTC | 10m |
| 2026-04-16 | HXA4140 | SZX → HDG | Apr 16, 06:34 UTC | Apr 16, 06:45 UTC | 10m |
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-32E8 page for operator, model, and routing details .