sensors Mode-S transponder
781C6F
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-326C · AIRBUS A-321neo
- Hex
- 781C6F
- Octal
- 36016157
- Decimal
- 7,871,599
- Country
- CN
- Tail
- B-326C
- Type
- A21N
- Flights observed
- 37
- Distinct callsigns
- 10
- Country
- CN
- Last broadcast
- 4d ago
Last known position
Country allocation
The ICAO 24-bit address 781C6F 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 10 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CCA414 | Air China | 18 | 2026-05-26 |
| CCA413 | Air China | 9 | 2026-04-29 |
| CCA4182 | Air China | 2 | 2026-05-08 |
| CCA4116 | Air China | 2 | 2026-05-09 |
| CCA4323 | Air China | 1 | 2026-05-04 |
| CCA4314 | Air China | 1 | 2026-05-10 |
| CCA4313 | Air China | 1 | 2026-05-10 |
| CCA4312 | Air China | 1 | 2026-05-11 |
| CCA4181 | Air China | 1 | 2026-05-08 |
| CCA2721 | Air China | 1 | 2026-04-26 |
Recent flights last 37
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-26 | CCA414 | HKT → TFU | May 26, 03:40 UTC | May 26, 09:04 UTC | 5h 25m |
| 2026-05-24 | CCA414 | HKT → TFU | May 24, 03:40 UTC | May 24, 08:50 UTC | 5h 10m |
| 2026-05-22 | CCA414 | HKT → TFU | May 22, 03:35 UTC | May 22, 08:55 UTC | 5h 20m |
| 2026-05-18 | CCA414 | HKT → TFU | May 18, 04:11 UTC | May 18, 08:25 UTC | 4h 15m |
| 2026-05-11 | CCA4312 | SZX → CTU | May 11, 11:05 UTC | May 11, 11:15 UTC | 10m |
| 2026-05-10 | CCA4314 | SZX → CTU | May 10, 09:30 UTC | May 10, 09:45 UTC | 15m |
| 2026-05-10 | CCA4313 | CTU → SZX | May 10, 07:34 UTC | May 10, 07:50 UTC | 15m |
| 2026-05-09 | CCA4116 | PEK → CTU | May 9, 07:10 UTC | May 9, 07:30 UTC | 20m |
| 2026-05-08 | CCA4182 | PEK → CTU | May 8, 23:15 UTC | May 8, 23:40 UTC | 25m |
| 2026-05-08 | CCA4181 | CTU → PEK | May 8, 12:20 UTC | May 8, 12:30 UTC | 10m |
| 2026-05-04 | CCA4323 | CTU → SZX | May 4, 10:55 UTC | May 4, 11:05 UTC | 10m |
| 2026-05-03 | CCA4116 | PEK → CTU | May 3, 07:40 UTC | May 3, 08:00 UTC | 20m |
| 2026-05-02 | CCA4182 | PEK → CTU | May 2, 23:05 UTC | May 2, 23:25 UTC | 20m |
| 2026-04-30 | CCA414 | HKT → TFU | Apr 30, 04:20 UTC | Apr 30, 08:50 UTC | 4h 30m |
| 2026-04-29 | CCA413 | TFU → HKT | Apr 29, 07:05 UTC | Apr 30, 05:05 UTC | 22h 0m |
| 2026-04-28 | CCA414 | HKT → TFU | Apr 28, 07:50 UTC | Apr 29, 07:20 UTC | 23h 30m |
| 2026-04-28 | CCA414 | HKT → TFU | Apr 28, 04:15 UTC | Apr 28, 08:30 UTC | 4h 15m |
| 2026-04-27 | CCA413 | TFU → HKT | Apr 27, 09:00 UTC | Apr 28, 07:45 UTC | 22h 45m |
| 2026-04-26 | CCA2721 | TFU → HRB | Apr 26, 07:25 UTC | Apr 26, 07:40 UTC | 15m |
| 2026-04-25 | CCA414 | HKT → TFU | Apr 25, 07:50 UTC | Apr 26, 07:40 UTC | 23h 50m |
| 2026-04-25 | CCA414 | HKT → TFU | Apr 25, 04:20 UTC | Apr 25, 08:30 UTC | 4h 10m |
| 2026-04-24 | CCA413 | TFU → HKT | Apr 24, 07:15 UTC | Apr 25, 05:00 UTC | 21h 45m |
| 2026-04-23 | CCA414 | HKT → TFU | Apr 23, 07:50 UTC | Apr 24, 07:30 UTC | 23h 40m |
| 2026-04-23 | CCA414 | HKT → TFU | Apr 23, 04:10 UTC | Apr 23, 09:05 UTC | 4h 55m |
| 2026-04-22 | CCA413 | TFU → HKT | Apr 22, 07:00 UTC | Apr 23, 05:25 UTC | 22h 25m |
| 2026-04-21 | CCA414 | HKT → TFU | Apr 21, 07:50 UTC | Apr 22, 07:10 UTC | 23h 20m |
| 2026-04-21 | CCA413 | TFU → HKT | Apr 21, 03:45 UTC | Apr 21, 08:50 UTC | 5h 5m |
| 2026-04-20 | CCA413 | TFU → HKT | Apr 20, 07:15 UTC | Apr 21, 05:05 UTC | 21h 50m |
| 2026-04-19 | CCA414 | HKT → TFU | Apr 19, 07:50 UTC | Apr 20, 07:25 UTC | 23h 35m |
| 2026-04-19 | CCA414 | HKT → TFU | Apr 19, 03:40 UTC | Apr 19, 08:55 UTC | 5h 15m |
| 2026-04-17 | CCA414 | HKT → TFU | Apr 17, 07:35 UTC | Apr 17, 08:20 UTC | 45m |
| 2026-04-17 | CCA413 | TFU → HKT | Apr 17, 04:25 UTC | Apr 17, 04:50 UTC | 26m |
| 2026-04-15 | CCA414 | HKT → TFU | Apr 15, 07:40 UTC | Apr 15, 08:25 UTC | 45m |
| 2026-04-15 | CCA413 | TFU → HKT | Apr 15, 05:00 UTC | Apr 15, 05:20 UTC | 20m |
| 2026-04-15 | CCA413 | TFU → HKT | Apr 15, 04:30 UTC | Apr 15, 04:50 UTC | 20m |
| 2026-04-13 | CCA414 | - | Apr 13, 08:00 UTC | Apr 13, 08:25 UTC | 25m |
| 2026-04-13 | CCA414 | - | Apr 13, 04:30 UTC | Apr 13, 08:15 UTC | 3h 45m |
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-326C page for operator, model, and routing details .