sensors Mode-S transponder
781E4B
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-32CC · AIRBUS A-321neo
- Hex
- 781E4B
- Octal
- 36017113
- Decimal
- 7,872,075
- Country
- CN
- Tail
- B-32CC
- Type
- A21N
- Flights observed
- 35
- Distinct callsigns
- 14
- Country
- CN
- Last broadcast
- 3h ago
Last known position
Country allocation
The ICAO 24-bit address 781E4B 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 | 11 | 2026-05-29 |
| CCA413 | Air China | 10 | 2026-05-25 |
| CCA4297 | Air China | 3 | 2026-06-10 |
| CCA4298 | Air China | 1 | 2026-05-30 |
| CCA4182 | Air China | 1 | 2026-06-05 |
| CCA4116 | Air China | 1 | 2026-06-06 |
| CCA4106 | Air China | 1 | 2026-06-11 |
| CCA4105 | Air China | 1 | 2026-06-11 |
| CCA4036 | Air China | 1 | 2026-06-06 |
| CCA2757 | Air China | 1 | 2026-05-24 |
| CCA2741 | Air China | 1 | 2026-04-25 |
| CCA2739 | Air China | 1 | 2026-04-29 |
| CCA2729 | Air China | 1 | 2026-04-25 |
| CCA2721 | Air China | 1 | 2026-05-05 |
Recent flights last 35
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-11 | CCA4106 | PEK → CTU | Jun 11, 12:55 UTC | Jun 11, 13:10 UTC | 15m |
| 2026-06-11 | CCA4105 | CTU → PEK | Jun 11, 10:00 UTC | Jun 11, 10:15 UTC | 15m |
| 2026-06-10 | CCA4297 | CTU → HAK | Jun 10, 04:35 UTC | Jun 10, 06:55 UTC | 2h 20m |
| 2026-06-06 | CCA4036 | SYX → CTU | Jun 6, 15:10 UTC | Jun 6, 15:30 UTC | 20m |
| 2026-06-06 | CCA4116 | PEK → CTU | Jun 6, 07:15 UTC | Jun 6, 12:49 UTC | 5h 35m |
| 2026-06-05 | CCA4182 | PEK → CTU | Jun 5, 23:15 UTC | Jun 5, 23:40 UTC | 25m |
| 2026-06-01 | CCA4297 | CTU → HAK | Jun 1, 04:10 UTC | Jun 1, 04:20 UTC | 10m |
| 2026-05-30 | CCA4298 | HAK → CTU | May 30, 06:50 UTC | May 30, 07:00 UTC | 10m |
| 2026-05-29 | CCA4297 | CTU → HAK | May 29, 08:50 UTC | May 30, 04:40 UTC | 19h 50m |
| 2026-05-29 | CCA414 | HKT → TFU | May 29, 07:45 UTC | May 30, 04:40 UTC | 20h 55m |
| 2026-05-29 | CCA414 | HKT → TFU | May 29, 03:40 UTC | May 29, 09:00 UTC | 5h 20m |
| 2026-05-27 | CCA414 | HKT → TFU | May 27, 03:50 UTC | May 27, 09:00 UTC | 5h 10m |
| 2026-05-25 | CCA413 | TFU → HKT | May 25, 03:55 UTC | May 25, 09:00 UTC | 5h 5m |
| 2026-05-24 | CCA413 | TFU → HKT | May 24, 13:20 UTC | May 25, 09:00 UTC | 19h 40m |
| 2026-05-24 | CCA2757 | TFU → NGB | May 24, 11:10 UTC | May 24, 11:20 UTC | 10m |
| 2026-05-21 | CCA413 | TFU → HKT | May 21, 03:40 UTC | May 21, 08:55 UTC | 5h 15m |
| 2026-05-19 | CCA414 | HKT → TFU | May 19, 04:10 UTC | May 19, 09:00 UTC | 4h 50m |
| 2026-05-17 | CCA413 | TFU → HKT | May 17, 04:15 UTC | May 17, 08:40 UTC | 4h 25m |
| 2026-05-15 | CCA414 | HKT → TFU | May 15, 03:45 UTC | May 15, 09:00 UTC | 5h 15m |
| 2026-05-13 | CCA413 | TFU → HKT | May 13, 03:50 UTC | May 13, 08:55 UTC | 5h 5m |
| 2026-05-11 | CCA413 | TFU → HKT | May 11, 03:45 UTC | May 11, 09:15 UTC | 5h 30m |
| 2026-05-09 | CCA414 | HKT → TFU | May 9, 03:55 UTC | May 9, 08:50 UTC | 4h 55m |
| 2026-05-08 | CCA413 | TFU → HKT | May 8, 07:04 UTC | May 9, 05:15 UTC | 22h 10m |
| 2026-05-07 | CCA414 | HKT → TFU | May 7, 08:50 UTC | May 8, 07:20 UTC | 22h 30m |
| 2026-05-07 | CCA414 | HKT → TFU | May 7, 03:45 UTC | May 7, 09:10 UTC | 5h 25m |
| 2026-05-06 | CCA413 | TFU → HKT | May 6, 06:55 UTC | May 7, 04:55 UTC | 21h 59m |
| 2026-05-05 | CCA2721 | TFU → HRB | May 5, 08:55 UTC | May 6, 07:10 UTC | 22h 15m |
| 2026-05-05 | CCA414 | HKT → TFU | May 5, 04:10 UTC | May 5, 09:00 UTC | 4h 50m |
| 2026-05-01 | CCA414 | HKT → TFU | May 1, 04:15 UTC | May 1, 08:40 UTC | 4h 25m |
| 2026-04-29 | CCA2739 | TFU → HRB | Apr 29, 01:05 UTC | Apr 29, 01:20 UTC | 15m |
| 2026-04-27 | CCA414 | HKT → TFU | Apr 27, 07:40 UTC | Apr 27, 09:15 UTC | 1h 35m |
| 2026-04-27 | CCA413 | TFU → HKT | Apr 27, 04:15 UTC | Apr 27, 05:05 UTC | 50m |
| 2026-04-26 | CCA413 | TFU → HKT | Apr 26, 09:00 UTC | Apr 27, 05:05 UTC | 20h 5m |
| 2026-04-25 | CCA2729 | TFU → HRB | Apr 25, 13:15 UTC | Apr 26, 09:15 UTC | 20h 0m |
| 2026-04-25 | CCA2741 | TFU → SHE | Apr 25, 01:55 UTC | Apr 25, 13:25 UTC | 11h 30m |
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-32CC page for operator, model, and routing details .