sensors Mode-S transponder
780055
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-5209 · BOEING 737-700
- Hex
- 780055
- Octal
- 36000125
- Decimal
- 7,864,405
- Country
- CN
- Tail
- B-5209
- Type
- B737
- Flights observed
- 41
- Distinct callsigns
- 17
- Country
- CN
- Last broadcast
- Jul 25, 14:20 UTC
Last known position
Country allocation
The ICAO 24-bit address 780055 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 17 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CUA5571 | - | 7 | 2026-07-21 |
| CUA5535 | - | 6 | 2026-06-25 |
| CUA5521 | - | 6 | 2026-07-11 |
| CUA5572 | - | 3 | 2026-07-21 |
| CUA5522 | - | 3 | 2026-07-18 |
| CUA5628 | China United Airlines | 2 | 2026-06-12 |
| CUA5598 | - | 2 | 2026-07-20 |
| CUA5536 | - | 2 | 2026-06-11 |
| CUA5391 | - | 2 | 2026-07-22 |
| CUA5885 | China United Airlines | 1 | 2026-07-25 |
| CUA5686 | China United Airlines | 1 | 2026-07-25 |
| CUA5685 | China United Airlines | 1 | 2026-07-25 |
| CUA5597 | - | 1 | 2026-07-10 |
| CUA5567 | - | 1 | 2026-05-28 |
| CUA5529 | - | 1 | 2026-05-27 |
| CUA5525 | China United Airlines | 1 | 2026-06-10 |
| CUA5362 | China United Airlines | 1 | 2026-07-24 |
Recent flights last 41
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | CUA5686 | HMI → PKX | Jul 25, 14:05 UTC | Jul 25, 14:20 UTC | 15m |
| 2026-07-25 | CUA5685 | PKX → HMI | Jul 25, 07:55 UTC | Jul 25, 08:05 UTC | 10m |
| 2026-07-25 | CUA5885 | PKX → HSN | Jul 25, 01:20 UTC | Jul 25, 01:30 UTC | 10m |
| 2026-07-24 | CUA5362 | HUZ → PKX | Jul 24, 07:10 UTC | Jul 24, 07:45 UTC | 35m |
| 2026-07-22 | CUA5391 | - | Jul 22, 13:40 UTC | Jul 22, 13:55 UTC | 15m |
| 2026-07-21 | CUA5572 | - | Jul 21, 03:20 UTC | Jul 21, 03:30 UTC | 10m |
| 2026-07-21 | CUA5571 | - | Jul 21, 00:30 UTC | Jul 21, 00:40 UTC | 10m |
| 2026-07-20 | CUA5598 | - | Jul 20, 14:50 UTC | Jul 20, 15:15 UTC | 25m |
| 2026-07-18 | CUA5522 | - | Jul 18, 11:50 UTC | Jul 18, 12:00 UTC | 10m |
| 2026-07-16 | CUA5571 | - | Jul 16, 00:30 UTC | Jul 16, 00:40 UTC | 10m |
| 2026-07-11 | CUA5522 | - | Jul 11, 12:20 UTC | Jul 11, 12:40 UTC | 20m |
| 2026-07-11 | CUA5521 | - | Jul 11, 07:45 UTC | Jul 11, 08:01 UTC | 15m |
| 2026-07-11 | CUA5572 | - | Jul 11, 03:30 UTC | Jul 11, 03:40 UTC | 10m |
| 2026-07-11 | CUA5571 | - | Jul 11, 00:30 UTC | Jul 11, 00:40 UTC | 10m |
| 2026-07-10 | CUA5598 | - | Jul 10, 13:45 UTC | Jul 10, 13:55 UTC | 10m |
| 2026-07-10 | CUA5597 | - | Jul 10, 08:50 UTC | Jul 10, 09:00 UTC | 10m |
| 2026-07-09 | CUA5521 | - | Jul 9, 07:40 UTC | Jul 9, 08:00 UTC | 20m |
| 2026-06-25 | CUA5521 | PKX → HLD | Jun 25, 10:30 UTC | Jun 25, 10:50 UTC | 20m |
| 2026-06-25 | CUA5535 | - | Jun 25, 05:05 UTC | Jun 25, 05:20 UTC | 15m |
| 2026-06-19 | CUA5522 | HLD → PKX | Jun 19, 16:09 UTC | Jun 19, 16:19 UTC | 10m |
| 2026-06-19 | CUA5521 | PKX → HLD | Jun 19, 11:20 UTC | Jun 19, 11:34 UTC | 15m |
| 2026-06-12 | CUA5628 | ACX → PKX | Jun 12, 14:20 UTC | Jun 12, 14:45 UTC | 25m |
| 2026-06-11 | CUA5536 | - | Jun 11, 08:50 UTC | Jun 11, 09:00 UTC | 10m |
| 2026-06-11 | CUA5535 | - | Jun 11, 05:05 UTC | Jun 11, 05:20 UTC | 15m |
| 2026-06-10 | CUA5521 | PKX → HLD | Jun 10, 07:00 UTC | Jun 10, 07:25 UTC | 25m |
| 2026-06-10 | CUA5525 | PKX → YSQ | Jun 10, 00:25 UTC | Jun 10, 00:35 UTC | 10m |
| 2026-06-08 | CUA5628 | - | Jun 8, 14:35 UTC | Jun 8, 14:50 UTC | 15m |
| 2026-06-07 | CUA5391 | PKX → LLF | Jun 7, 10:20 UTC | Jun 7, 10:35 UTC | 15m |
| 2026-06-04 | CUA5571 | - | Jun 4, 00:10 UTC | Jun 4, 00:20 UTC | 10m |
| 2026-05-28 | CUA5567 | - | May 28, 03:00 UTC | May 28, 03:20 UTC | 20m |
| 2026-05-27 | CUA5529 | - | May 27, 10:35 UTC | May 27, 10:50 UTC | 15m |
| 2026-05-07 | CUA5572 | - | May 7, 03:25 UTC | May 7, 03:35 UTC | 10m |
| 2026-05-07 | CUA5571 | - | May 7, 00:20 UTC | May 7, 00:35 UTC | 15m |
| 2026-05-05 | CUA5571 | - | May 5, 00:25 UTC | May 5, 00:40 UTC | 15m |
| 2026-05-01 | CUA5535 | - | May 1, 05:15 UTC | May 1, 05:30 UTC | 15m |
| 2026-04-30 | CUA5521 | PKX → HLD | Apr 30, 07:45 UTC | Apr 30, 08:00 UTC | 15m |
| 2026-04-28 | CUA5571 | - | Apr 28, 00:15 UTC | Apr 28, 00:25 UTC | 10m |
| 2026-04-25 | CUA5536 | - | Apr 25, 08:40 UTC | Apr 25, 08:50 UTC | 10m |
| 2026-04-25 | CUA5535 | - | Apr 25, 05:00 UTC | Apr 25, 05:10 UTC | 10m |
| 2026-04-23 | CUA5535 | - | Apr 23, 04:55 UTC | Apr 23, 05:10 UTC | 15m |
| 2026-04-20 | CUA5535 | - | Apr 20, 05:05 UTC | Apr 20, 05:25 UTC | 20m |
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-5209 page for operator, model, and routing details .