sensors Mode-S transponder
781F4C
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-223N · BOEING 777-200LR
- Hex
- 781F4C
- Octal
- 36017514
- Decimal
- 7,872,332
- Country
- CN
- Tail
- B-223N
- Type
- B77L
- Flights observed
- 85
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 2h ago
Last known position
Country allocation
The ICAO 24-bit address 781F4C 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 |
|---|---|---|---|
| CSG2531 | - | 9 | 2026-05-28 |
| CSG2599 | - | 5 | 2026-05-09 |
| CSG2549 | - | 5 | 2026-05-07 |
| CSG2537 | - | 5 | 2026-05-12 |
| CSG2532 | - | 5 | 2026-05-28 |
| CSG2682 | - | 4 | 2026-05-08 |
| CSG2534 | - | 3 | 2026-04-19 |
| CSG2530 | - | 3 | 2026-04-24 |
| CSG2523 | - | 3 | 2026-06-02 |
| CSG2516 | - | 3 | 2026-04-18 |
| CSG2514 | - | 3 | 2026-05-30 |
| CSG2507 | - | 3 | 2026-05-31 |
| CSG2505 | - | 3 | 2026-05-15 |
| CSG2547 | - | 2 | 2026-05-05 |
| CSG2543 | - | 2 | 2026-04-22 |
| CSG2535 | - | 2 | 2026-04-21 |
| CSG2533 | - | 2 | 2026-04-19 |
| CSG2529 | - | 2 | 2026-04-23 |
| CSG2524 | - | 2 | 2026-06-02 |
| CSG2515 | - | 2 | 2026-04-18 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-03 | CSG2503 | - | Jun 3, 13:45 UTC | Jun 3, 15:00 UTC | 1h 15m |
| 2026-06-02 | CSG2524 | - | Jun 2, 13:05 UTC | Jun 2, 20:20 UTC | 7h 15m |
| 2026-06-02 | CSG2524 | - | Jun 2, 12:15 UTC | Jun 2, 12:30 UTC | 15m |
| 2026-06-02 | CSG2523 | - | Jun 2, 02:55 UTC | Jun 2, 09:05 UTC | 6h 10m |
| 2026-06-01 | CSG2523 | - | Jun 1, 10:30 UTC | Jun 2, 01:20 UTC | 14h 50m |
| 2026-06-01 | CSG2523 | - | Jun 1, 04:10 UTC | Jun 2, 01:20 UTC | 21h 10m |
| 2026-05-31 | CSG2508 | - | May 31, 23:05 UTC | Jun 1, 19:00 UTC | 19h 55m |
| 2026-05-31 | CSG2508 | - | May 31, 22:35 UTC | Jun 1, 19:00 UTC | 20h 25m |
| 2026-05-31 | CSG2507 | - | May 31, 14:05 UTC | May 31, 19:50 UTC | 5h 45m |
| 2026-05-30 | CSG2507 | - | May 30, 17:05 UTC | May 31, 13:00 UTC | 19h 55m |
| 2026-05-30 | CSG2507 | - | May 30, 16:15 UTC | May 31, 13:00 UTC | 20h 45m |
| 2026-05-30 | CSG2514 | - | May 30, 13:05 UTC | May 31, 13:00 UTC | 23h 55m |
| 2026-05-30 | CSG2514 | - | May 30, 12:15 UTC | May 31, 11:00 UTC | 22h 45m |
| 2026-05-29 | CSG2513 | - | May 29, 23:35 UTC | May 30, 09:10 UTC | 9h 35m |
| 2026-05-29 | CSG2513 | - | May 29, 09:40 UTC | May 30, 09:00 UTC | 23h 20m |
| 2026-05-28 | CSG2532 | - | May 28, 16:00 UTC | May 28, 22:35 UTC | 6h 35m |
| 2026-05-28 | CSG2531 | - | May 28, 07:20 UTC | May 28, 13:35 UTC | 6h 15m |
| 2026-05-27 | CSG2531 | - | May 27, 17:45 UTC | May 28, 13:35 UTC | 19h 50m |
| 2026-05-27 | CSG2531 | - | May 27, 15:40 UTC | May 28, 13:35 UTC | 21h 55m |
| 2026-05-27 | CSG2532 | - | May 27, 13:05 UTC | May 28, 13:00 UTC | 23h 55m |
| 2026-05-27 | CSG2532 | - | May 27, 12:10 UTC | May 28, 10:20 UTC | 22h 10m |
| 2026-05-27 | CSG2531 | - | May 27, 02:54 UTC | May 27, 09:45 UTC | 6h 51m |
| 2026-05-16 | CSG2506 | - | May 16, 07:35 UTC | May 16, 20:30 UTC | 12h 55m |
| 2026-05-15 | CSG2505 | - | May 15, 21:35 UTC | May 16, 03:20 UTC | 5h 45m |
| 2026-05-14 | CSG2505 | - | May 14, 21:05 UTC | May 15, 20:00 UTC | 22h 54m |
| 2026-05-14 | CSG2505 | - | May 14, 20:20 UTC | May 15, 19:00 UTC | 22h 39m |
| 2026-05-14 | CSG2598 | - | May 14, 09:05 UTC | May 14, 21:40 UTC | 12h 35m |
| 2026-05-13 | CSG2597 | - | May 13, 23:30 UTC | May 14, 01:40 UTC | 2h 10m |
| 2026-05-12 | CSG2514 | - | May 12, 18:05 UTC | May 12, 23:25 UTC | 5h 20m |
| 2026-05-12 | CSG2537 | - | May 12, 10:25 UTC | May 12, 15:35 UTC | 5h 10m |
| 2026-05-10 | CSG2537 | - | May 10, 18:20 UTC | May 11, 01:30 UTC | 7h 10m |
| 2026-05-09 | CSG2506 | - | May 9, 16:40 UTC | May 9, 17:45 UTC | 1h 5m |
| 2026-05-09 | CSG2599 | ANC → ORD | May 9, 08:40 UTC | May 9, 13:55 UTC | 5h 15m |
| 2026-05-09 | CSG2599 | - | May 9, 00:30 UTC | May 9, 07:05 UTC | 6h 35m |
| 2026-05-08 | CSG2682 | - | May 8, 01:40 UTC | May 8, 14:25 UTC | 12h 45m |
| 2026-05-07 | CSG2549 | - | May 7, 17:20 UTC | May 7, 22:40 UTC | 5h 20m |
| 2026-05-07 | CSG2549 | - | May 7, 08:30 UTC | May 7, 16:00 UTC | 7h 30m |
| 2026-05-07 | CSG2549 | - | May 7, 06:15 UTC | May 7, 06:25 UTC | 10m |
| 2026-05-06 | - | - | May 6, 18:20 UTC | May 6, 18:35 UTC | 15m |
| 2026-05-06 | CSG2548 | - | May 6, 03:20 UTC | May 6, 16:15 UTC | 12h 55m |
| 2026-05-05 | CSG2547 | ANC → ORD | May 5, 18:40 UTC | May 6, 00:01 UTC | 5h 20m |
| 2026-05-05 | CSG2547 | - | May 5, 10:35 UTC | May 5, 17:30 UTC | 6h 55m |
| 2026-05-04 | CSG2682 | - | May 4, 13:55 UTC | May 5, 02:35 UTC | 12h 41m |
| 2026-05-04 | CSG2549 | ANC → ORD | May 4, 06:40 UTC | May 4, 11:35 UTC | 4h 55m |
| 2026-05-03 | CSG2549 | - | May 3, 20:55 UTC | May 4, 03:45 UTC | 6h 50m |
| 2026-05-02 | CSG2686 | - | May 2, 22:40 UTC | May 3, 11:35 UTC | 12h 54m |
| 2026-05-02 | CSG2599 | ANC → ORD | May 2, 14:50 UTC | May 2, 19:55 UTC | 5h 5m |
| 2026-05-02 | CSG2599 | - | May 2, 06:25 UTC | May 2, 13:15 UTC | 6h 50m |
| 2026-05-02 | CSG2599 | - | May 2, 04:15 UTC | May 2, 04:25 UTC | 10m |
| 2026-05-01 | CSG2682 | - | May 1, 22:05 UTC | May 1, 22:20 UTC | 15m |
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-223N page for operator, model, and routing details .