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
- 187
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 1d 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 |
|---|---|---|---|
| CSG2549 | - | 10 | 2026-07-16 |
| CSG2505 | - | 10 | 2026-07-11 |
| CSG2531 | - | 9 | 2026-05-28 |
| CSG2501 | - | 9 | 2026-07-04 |
| CSG2535 | - | 8 | 2026-06-22 |
| CSG2513 | - | 8 | 2026-07-08 |
| CSG2545 | - | 7 | 2026-06-27 |
| CSG2537 | - | 7 | 2026-07-01 |
| CSG2523 | - | 7 | 2026-06-09 |
| CSG2514 | - | 7 | 2026-07-09 |
| CSG2508 | - | 6 | 2026-07-13 |
| CSG2507 | - | 6 | 2026-07-12 |
| CSG2599 | - | 5 | 2026-05-09 |
| CSG2532 | - | 5 | 2026-05-28 |
| CSG2686 | - | 4 | 2026-07-05 |
| CSG2682 | - | 4 | 2026-05-08 |
| CSG2546 | - | 4 | 2026-06-28 |
| CSG2536 | - | 4 | 2026-06-23 |
| CSG2530 | - | 4 | 2026-06-29 |
| CSG2524 | - | 4 | 2026-06-10 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-16 | CSG2550 | - | Jul 16, 22:49 UTC | Jul 17, 11:50 UTC | 13h 0m |
| 2026-07-16 | CSG2549 | ANC → ORD | Jul 16, 15:14 UTC | Jul 16, 20:19 UTC | 5h 5m |
| 2026-07-16 | CSG2549 | - | Jul 16, 05:10 UTC | Jul 16, 12:14 UTC | 7h 5m |
| 2026-07-16 | CSG2549 | - | Jul 16, 03:00 UTC | Jul 16, 03:10 UTC | 10m |
| 2026-07-15 | CSG2548 | - | Jul 15, 13:25 UTC | Jul 15, 13:35 UTC | 10m |
| 2026-07-14 | CSG2548 | - | Jul 14, 21:55 UTC | Jul 15, 11:15 UTC | 13h 19m |
| 2026-07-14 | CSG2673 | - | Jul 14, 13:55 UTC | Jul 14, 19:10 UTC | 5h 15m |
| 2026-07-13 | CSG2673 | - | Jul 13, 18:25 UTC | Jul 14, 12:40 UTC | 18h 15m |
| 2026-07-13 | CSG2673 | - | Jul 13, 13:05 UTC | Jul 14, 12:40 UTC | 23h 35m |
| 2026-07-13 | CSG2508 | - | Jul 13, 11:40 UTC | Jul 14, 06:50 UTC | 19h 10m |
| 2026-07-13 | CSG2508 | - | Jul 13, 09:05 UTC | Jul 14, 06:50 UTC | 21h 45m |
| 2026-07-13 | CSG2508 | - | Jul 13, 07:05 UTC | Jul 14, 06:50 UTC | 23h 45m |
| 2026-07-12 | CSG2507 | ANC → ORD | Jul 12, 22:20 UTC | Jul 13, 03:40 UTC | 5h 20m |
| 2026-07-12 | CSG2507 | - | Jul 12, 03:35 UTC | Jul 12, 21:00 UTC | 17h 25m |
| 2026-07-11 | CSG2507 | - | Jul 11, 21:40 UTC | Jul 12, 21:00 UTC | 23h 20m |
| 2026-07-11 | CSG2502 | - | Jul 11, 17:05 UTC | Jul 12, 13:25 UTC | 20h 20m |
| 2026-07-11 | CSG2502 | - | Jul 11, 15:30 UTC | Jul 12, 13:25 UTC | 21h 55m |
| 2026-07-11 | CSG2505 | - | Jul 11, 00:35 UTC | Jul 11, 05:50 UTC | 5h 15m |
| 2026-07-10 | CSG2505 | - | Jul 10, 16:05 UTC | Jul 10, 23:15 UTC | 7h 11m |
| 2026-07-09 | CSG2505 | - | Jul 9, 23:05 UTC | Jul 10, 23:00 UTC | 23h 55m |
| 2026-07-09 | CSG2514 | - | Jul 9, 21:40 UTC | Jul 10, 16:05 UTC | 18h 25m |
| 2026-07-09 | CSG2514 | - | Jul 9, 11:50 UTC | Jul 9, 23:35 UTC | 11h 45m |
| 2026-07-08 | CSG2513 | - | Jul 8, 14:25 UTC | Jul 9, 08:40 UTC | 18h 15m |
| 2026-07-08 | CSG2514 | - | Jul 8, 05:05 UTC | Jul 8, 23:50 UTC | 18h 45m |
| 2026-07-08 | CSG2514 | - | Jul 8, 04:35 UTC | Jul 8, 23:50 UTC | 19h 15m |
| 2026-07-07 | CSG2513 | - | Jul 7, 15:05 UTC | Jul 8, 01:40 UTC | 10h 35m |
| 2026-07-07 | CSG2513 | - | Jul 7, 06:00 UTC | Jul 8, 01:40 UTC | 19h 40m |
| 2026-07-06 | CSG2513 | - | Jul 6, 23:45 UTC | Jul 7, 16:55 UTC | 17h 10m |
| 2026-07-06 | CSG2513 | - | Jul 6, 19:05 UTC | Jul 7, 16:55 UTC | 21h 50m |
| 2026-07-06 | CSG2508 | - | Jul 6, 18:05 UTC | Jul 7, 16:55 UTC | 22h 50m |
| 2026-07-06 | CSG2549 | ANC → ORD | Jul 6, 09:55 UTC | Jul 6, 15:10 UTC | 5h 15m |
| 2026-07-06 | CSG2549 | - | Jul 6, 01:10 UTC | Jul 6, 08:50 UTC | 7h 40m |
| 2026-07-05 | CSG2686 | - | Jul 5, 17:55 UTC | Jul 5, 18:20 UTC | 25m |
| 2026-07-05 | CSG2686 | - | Jul 5, 02:40 UTC | Jul 5, 15:40 UTC | 13h 0m |
| 2026-07-04 | CSG2501 | ANC → ORD | Jul 4, 18:25 UTC | Jul 5, 00:05 UTC | 5h 40m |
| 2026-07-04 | CSG2501 | - | Jul 4, 07:00 UTC | Jul 4, 14:20 UTC | 7h 20m |
| 2026-07-03 | CSG2501 | - | Jul 3, 13:20 UTC | Jul 4, 13:00 UTC | 23h 40m |
| 2026-07-02 | CSG2558 | - | Jul 2, 18:05 UTC | Jul 3, 11:10 UTC | 17h 5m |
| 2026-07-01 | CSG2557 | - | Jul 1, 21:05 UTC | Jul 2, 15:25 UTC | 18h 20m |
| 2026-07-01 | CSG2557 | - | Jul 1, 20:40 UTC | Jul 2, 15:25 UTC | 18h 45m |
| 2026-07-01 | CSG2538 | - | Jul 1, 10:15 UTC | Jul 1, 22:30 UTC | 12h 15m |
| 2026-07-01 | CSG2537 | - | Jul 1, 02:10 UTC | Jul 1, 06:30 UTC | 4h 20m |
| 2026-06-30 | CSG2537 | - | Jun 30, 17:35 UTC | Jul 1, 00:45 UTC | 7h 10m |
| 2026-06-29 | CSG2530 | - | Jun 29, 17:10 UTC | Jun 29, 23:09 UTC | 6h 0m |
| 2026-06-29 | CSG2529 | - | Jun 29, 12:20 UTC | Jun 29, 14:34 UTC | 2h 15m |
| 2026-06-28 | CSG2546 | - | Jun 28, 20:09 UTC | Jun 28, 20:19 UTC | 10m |
| 2026-06-28 | CSG2546 | - | Jun 28, 04:29 UTC | Jun 28, 18:10 UTC | 13h 40m |
| 2026-06-27 | CSG2545 | ANC → JFK | Jun 27, 19:15 UTC | Jun 28, 01:29 UTC | 6h 15m |
| 2026-06-27 | CSG2545 | - | Jun 27, 10:19 UTC | Jun 27, 17:29 UTC | 7h 10m |
| 2026-06-26 | CSG2546 | - | Jun 26, 12:24 UTC | Jun 27, 01:49 UTC | 13h 25m |
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 .