sensors Mode-S transponder
781DD7
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-32A2 · AIRBUS A-321neo
- Hex
- 781DD7
- Octal
- 36016727
- Decimal
- 7,871,959
- Country
- CN
- Tail
- B-32A2
- Type
- A21N
- Flights observed
- 32
- Distinct callsigns
- 14
- Country
- CN
- Last broadcast
- 2d ago
Last known position
Country allocation
The ICAO 24-bit address 781DD7 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 14 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CCA414 | Air China | 8 | 2026-06-11 |
| CCA413 | Air China | 6 | 2026-06-05 |
| CCA4182 | Air China | 3 | 2026-05-26 |
| CCA4116 | Air China | 3 | 2026-05-27 |
| CCA4338 | Air China | 2 | 2026-05-25 |
| CCA4314 | Air China | 2 | 2026-05-06 |
| CCA4324 | Air China | 1 | 2026-04-21 |
| CCA4316 | Air China | 1 | 2026-06-13 |
| CCA4315 | Air China | 1 | 2026-06-13 |
| CCA4312 | Air China | 1 | 2026-05-25 |
| CCA4298 | Air China | 1 | 2026-06-12 |
| CCA4297 | Air China | 1 | 2026-06-12 |
| CCA4115 | Air China | 1 | 2026-05-04 |
| CCA2721 | Air China | 1 | 2026-05-09 |
Recent flights last 32
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-13 | CCA4316 | HAK → CTU | Jun 13, 10:10 UTC | Jun 13, 10:25 UTC | 15m |
| 2026-06-13 | CCA4315 | CTU → HAK | Jun 13, 07:45 UTC | Jun 13, 08:00 UTC | 15m |
| 2026-06-12 | CCA4298 | HAK → CTU | Jun 12, 06:50 UTC | Jun 12, 07:05 UTC | 15m |
| 2026-06-12 | CCA4297 | CTU → HAK | Jun 12, 04:20 UTC | Jun 12, 04:30 UTC | 10m |
| 2026-06-11 | CCA414 | HKT → TFU | Jun 11, 07:50 UTC | Jun 12, 04:30 UTC | 20h 40m |
| 2026-06-11 | CCA414 | HKT → TFU | Jun 11, 07:30 UTC | Jun 12, 04:30 UTC | 21h 1m |
| 2026-06-11 | CCA414 | HKT → TFU | Jun 11, 04:20 UTC | Jun 11, 08:45 UTC | 4h 25m |
| 2026-06-07 | CCA414 | HKT → TFU | Jun 7, 03:45 UTC | Jun 7, 08:50 UTC | 5h 5m |
| 2026-06-05 | CCA413 | TFU → HKT | Jun 5, 03:35 UTC | Jun 5, 08:50 UTC | 5h 15m |
| 2026-06-03 | CCA414 | HKT → TFU | Jun 3, 08:45 UTC | Jun 3, 12:55 UTC | 4h 10m |
| 2026-06-03 | CCA413 | TFU → HKT | Jun 3, 06:40 UTC | Jun 3, 07:05 UTC | 25m |
| 2026-06-02 | CCA413 | TFU → HKT | Jun 2, 15:15 UTC | Jun 3, 05:10 UTC | 13h 55m |
| 2026-05-27 | CCA4116 | PEK → CTU | May 27, 07:25 UTC | May 27, 07:40 UTC | 15m |
| 2026-05-26 | CCA4182 | PEK → CTU | May 26, 23:10 UTC | May 26, 23:35 UTC | 25m |
| 2026-05-25 | CCA4312 | SZX → CTU | May 25, 11:10 UTC | May 25, 11:25 UTC | 15m |
| 2026-05-25 | CCA4338 | SZX → CTU | May 25, 03:30 UTC | May 25, 03:45 UTC | 15m |
| 2026-05-16 | CCA414 | HKT → TFU | May 16, 03:35 UTC | May 16, 08:55 UTC | 5h 21m |
| 2026-05-14 | CCA413 | TFU → HKT | May 14, 03:45 UTC | May 14, 08:50 UTC | 5h 5m |
| 2026-05-12 | CCA413 | TFU → HKT | May 12, 03:55 UTC | May 12, 08:40 UTC | 4h 45m |
| 2026-05-09 | CCA2721 | TFU → HRB | May 9, 07:10 UTC | May 9, 07:20 UTC | 10m |
| 2026-05-08 | CCA414 | HKT → TFU | May 8, 07:50 UTC | May 9, 07:20 UTC | 23h 30m |
| 2026-05-08 | CCA414 | HKT → TFU | May 8, 03:39 UTC | May 8, 08:55 UTC | 5h 15m |
| 2026-05-07 | CCA413 | TFU → HKT | May 7, 07:00 UTC | May 8, 04:54 UTC | 21h 55m |
| 2026-05-06 | CCA4314 | SZX → CTU | May 6, 09:30 UTC | May 6, 09:45 UTC | 15m |
| 2026-05-04 | CCA4116 | PEK → CTU | May 4, 07:25 UTC | May 4, 07:40 UTC | 15m |
| 2026-05-04 | CCA4115 | CTU → PEK | May 4, 05:15 UTC | May 4, 05:25 UTC | 10m |
| 2026-05-03 | CCA4182 | PEK → CTU | May 3, 23:15 UTC | May 3, 23:35 UTC | 20m |
| 2026-05-01 | CCA4314 | SZX → CTU | May 1, 09:35 UTC | May 1, 09:50 UTC | 15m |
| 2026-04-29 | CCA4338 | SZX → CTU | Apr 29, 03:30 UTC | Apr 29, 03:45 UTC | 15m |
| 2026-04-24 | CCA4116 | PEK → CTU | Apr 24, 07:10 UTC | Apr 24, 07:35 UTC | 25m |
| 2026-04-23 | CCA4182 | PEK → CTU | Apr 23, 23:10 UTC | Apr 23, 23:30 UTC | 20m |
| 2026-04-21 | CCA4324 | SZX → CTU | Apr 21, 12:40 UTC | Apr 21, 12:50 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-32A2 page for operator, model, and routing details .