sensors Mode-S transponder
781387
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-1277 · BOEING 737-800
- Hex
- 781387
- Octal
- 36011607
- Decimal
- 7,869,319
- Country
- CN
- Tail
- B-1277
- Type
- B738
- Flights observed
- 43
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 2d ago
Last known position
Country allocation
The ICAO 24-bit address 781387 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 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CUA2819 | - | 8 | 2026-07-14 |
| CUA877 | - | 3 | 2026-07-17 |
| CUA872 | China United Airlines | 3 | 2026-07-15 |
| CUA871 | - | 3 | 2026-07-15 |
| CUA2126 | - | 3 | 2026-07-17 |
| CUA880 | China United Airlines | 2 | 2026-07-05 |
| CUA5595 | China United Airlines | 2 | 2026-07-01 |
| CUA870 | China United Airlines | 1 | 2026-06-17 |
| CUA869 | China United Airlines | 1 | 2026-06-17 |
| CUA5852 | - | 1 | 2026-06-21 |
| CUA5851 | - | 1 | 2026-06-21 |
| CUA5752 | - | 1 | 2026-05-29 |
| CUA5597 | - | 1 | 2026-06-23 |
| CUA5569 | China United Airlines | 1 | 2026-05-08 |
| CUA5567 | - | 1 | 2026-04-19 |
| CUA5529 | - | 1 | 2026-04-25 |
| CUA5526 | - | 1 | 2026-07-12 |
| CUA5525 | - | 1 | 2026-07-12 |
| CUA5522 | China United Airlines | 1 | 2026-06-22 |
| CUA5521 | China United Airlines | 1 | 2026-06-22 |
Recent flights last 43
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-17 | CUA877 | - | Jul 17, 05:50 UTC | Jul 17, 06:00 UTC | 10m |
| 2026-07-17 | CUA2126 | - | Jul 17, 02:25 UTC | Jul 17, 02:34 UTC | 10m |
| 2026-07-16 | CUA877 | - | Jul 16, 06:00 UTC | Jul 16, 06:10 UTC | 10m |
| 2026-07-16 | CUA2126 | - | Jul 16, 02:40 UTC | Jul 16, 02:55 UTC | 15m |
| 2026-07-15 | CUA872 | CJJ → DSN | Jul 15, 12:55 UTC | Jul 15, 13:30 UTC | 35m |
| 2026-07-15 | CUA871 | - | Jul 15, 10:35 UTC | Jul 15, 11:00 UTC | 25m |
| 2026-07-14 | CUA2819 | - | Jul 14, 23:40 UTC | Jul 15, 09:45 UTC | 10h 5m |
| 2026-07-12 | CUA5526 | - | Jul 12, 04:25 UTC | Jul 12, 04:35 UTC | 10m |
| 2026-07-12 | CUA5525 | - | Jul 12, 01:05 UTC | Jul 12, 01:15 UTC | 10m |
| 2026-07-09 | CUA2126 | - | Jul 9, 02:40 UTC | Jul 9, 02:55 UTC | 15m |
| 2026-07-07 | CUA2819 | - | Jul 7, 23:35 UTC | Jul 8, 00:00 UTC | 25m |
| 2026-07-05 | CUA2819 | - | Jul 5, 23:35 UTC | Jul 6, 00:05 UTC | 30m |
| 2026-07-05 | CUA880 | TAE → DSN | Jul 5, 06:35 UTC | Jul 5, 06:45 UTC | 10m |
| 2026-07-05 | CUA880 | TAE → DSN | Jul 5, 04:55 UTC | Jul 5, 05:35 UTC | 40m |
| 2026-07-04 | CUA872 | CJJ → DSN | Jul 4, 13:00 UTC | Jul 5, 03:05 UTC | 14h 5m |
| 2026-07-04 | CUA871 | DSN → CJJ | Jul 4, 11:20 UTC | Jul 4, 11:50 UTC | 30m |
| 2026-07-01 | CUA5595 | PKX → DBC | Jul 1, 23:45 UTC | Jul 1, 23:55 UTC | 10m |
| 2026-06-26 | CUA2819 | - | Jun 26, 23:39 UTC | Jun 27, 00:05 UTC | 25m |
| 2026-06-23 | CUA5597 | - | Jun 23, 09:34 UTC | Jun 23, 09:45 UTC | 10m |
| 2026-06-22 | CUA5522 | HLD → PKX | Jun 22, 14:49 UTC | Jun 22, 14:59 UTC | 10m |
| 2026-06-22 | CUA5521 | PKX → HLD | Jun 22, 10:30 UTC | Jun 22, 10:44 UTC | 15m |
| 2026-06-22 | CUA877 | - | Jun 22, 02:45 UTC | Jun 22, 02:59 UTC | 15m |
| 2026-06-21 | CUA5852 | - | Jun 21, 10:04 UTC | Jun 21, 10:14 UTC | 10m |
| 2026-06-21 | CUA5851 | - | Jun 21, 08:15 UTC | Jun 21, 08:25 UTC | 10m |
| 2026-06-17 | CUA870 | ICN → DSN | Jun 17, 13:25 UTC | Jun 17, 13:45 UTC | 20m |
| 2026-06-17 | CUA869 | DSN → ICN | Jun 17, 11:05 UTC | Jun 17, 11:25 UTC | 20m |
| 2026-06-12 | CUA5595 | PKX → DBC | Jun 12, 23:40 UTC | Jun 12, 23:50 UTC | 10m |
| 2026-06-11 | CUA2819 | DSN → NKG | Jun 11, 23:45 UTC | Jun 12, 00:10 UTC | 25m |
| 2026-06-10 | CUA2819 | DSN → NKG | Jun 10, 23:50 UTC | Jun 11, 23:45 UTC | 23h 55m |
| 2026-06-10 | CUA872 | CJJ → DSN | Jun 10, 13:25 UTC | Jun 11, 00:00 UTC | 10h 35m |
| 2026-06-10 | CUA871 | DSN → CJJ | Jun 10, 10:25 UTC | Jun 10, 10:55 UTC | 30m |
| 2026-06-03 | CUA2819 | DSN → NKG | Jun 3, 23:35 UTC | Jun 3, 23:55 UTC | 20m |
| 2026-05-29 | CUA5752 | - | May 29, 23:45 UTC | May 30, 00:10 UTC | 25m |
| 2026-05-28 | CUA5010 | - | May 28, 09:30 UTC | May 28, 09:40 UTC | 10m |
| 2026-05-28 | CUA5009 | - | May 28, 06:35 UTC | May 28, 06:55 UTC | 20m |
| 2026-05-18 | CUA2819 | DSN → NKG | May 18, 23:30 UTC | May 18, 23:55 UTC | 25m |
| 2026-05-08 | CUA5569 | PKX → DQA | May 8, 05:09 UTC | May 8, 05:20 UTC | 10m |
| 2026-05-07 | CUA5137 | - | May 7, 03:05 UTC | May 7, 03:20 UTC | 15m |
| 2026-04-27 | CUA5252 | - | Apr 27, 10:55 UTC | Apr 27, 11:05 UTC | 10m |
| 2026-04-27 | CUA5251 | - | Apr 27, 08:15 UTC | Apr 27, 08:30 UTC | 15m |
| 2026-04-25 | CUA5529 | - | Apr 25, 10:35 UTC | Apr 25, 10:50 UTC | 15m |
| 2026-04-24 | CUA2930 | HLD → SJW | Apr 24, 09:00 UTC | Apr 24, 09:15 UTC | 15m |
| 2026-04-19 | CUA5567 | - | Apr 19, 01:55 UTC | Apr 19, 02:05 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-1277 page for operator, model, and routing details .