sensors Mode-S transponder
780F56
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-7557 · BOEING 737-800
- Hex
- 780F56
- Octal
- 36007526
- Decimal
- 7,868,246
- Country
- CN
- Tail
- B-7557
- Type
- B738
- Flights observed
- 17
- Distinct callsigns
- 10
- Country
- CN
- Last broadcast
- May 1, 12:40 UTC
Last known position
Country allocation
The ICAO 24-bit address 780F56 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 |
|---|---|---|---|
| CXA8818 | Xiamen Airlines | 5 | 2026-04-28 |
| CXA8070 | Xiamen Airlines | 3 | 2026-04-19 |
| CXA8555 | Xiamen Airlines | 2 | 2026-04-26 |
| CXA8812 | Xiamen Airlines | 1 | 2026-04-20 |
| CXA8576 | Xiamen Airlines | 1 | 2026-04-24 |
| CXA8342 | - | 1 | 2026-04-24 |
| CXA8341 | - | 1 | 2026-04-24 |
| CXA8221 | - | 1 | 2026-04-14 |
| CXA8028 | Xiamen Airlines | 1 | 2026-05-01 |
| CXA8027 | Xiamen Airlines | 1 | 2026-05-01 |
Recent flights last 17
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-01 | CXA8028 | CGQ → YCU | May 1, 12:30 UTC | May 1, 12:40 UTC | 10m |
| 2026-05-01 | CXA8027 | YCU → CGQ | May 1, 08:25 UTC | May 1, 08:35 UTC | 10m |
| 2026-04-28 | CXA8818 | HRB → HGH | Apr 28, 09:20 UTC | Apr 29, 01:15 UTC | 15h 55m |
| 2026-04-28 | CXA8818 | HRB → HGH | Apr 28, 01:15 UTC | Apr 28, 14:45 UTC | 13h 30m |
| 2026-04-27 | CXA8818 | HRB → HGH | Apr 27, 09:50 UTC | Apr 28, 09:30 UTC | 23h 40m |
| 2026-04-26 | CXA8818 | HRB → HGH | Apr 26, 15:05 UTC | Apr 27, 10:00 UTC | 18h 55m |
| 2026-04-26 | CXA8555 | PKX → PVG | Apr 26, 01:05 UTC | Apr 26, 15:05 UTC | 14h 0m |
| 2026-04-25 | CXA8818 | HRB → HGH | Apr 25, 09:15 UTC | Apr 26, 01:05 UTC | 15h 50m |
| 2026-04-24 | CXA8555 | PKX → PVG | Apr 24, 16:30 UTC | Apr 25, 09:50 UTC | 17h 20m |
| 2026-04-24 | CXA8342 | - | Apr 24, 10:30 UTC | Apr 25, 09:20 UTC | 22h 50m |
| 2026-04-24 | CXA8341 | - | Apr 24, 07:15 UTC | Apr 25, 01:05 UTC | 17h 50m |
| 2026-04-24 | CXA8576 | HSN → XMN | Apr 24, 02:25 UTC | Apr 24, 02:35 UTC | 10m |
| 2026-04-20 | CXA8812 | HRB → HGH | Apr 20, 05:50 UTC | Apr 20, 06:40 UTC | 50m |
| 2026-04-19 | CXA8070 | CGQ → HGH | Apr 19, 11:20 UTC | Apr 20, 06:40 UTC | 19h 20m |
| 2026-04-18 | CXA8070 | CGQ → HGH | Apr 18, 11:40 UTC | Apr 19, 11:30 UTC | 23h 50m |
| 2026-04-18 | CXA8070 | CGQ → HGH | Apr 18, 00:55 UTC | Apr 18, 12:30 UTC | 11h 35m |
| 2026-04-14 | CXA8221 | - | Apr 14, 05:40 UTC | Apr 14, 05:50 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-7557 page for operator, model, and routing details .