sensors Mode-S transponder
781F03
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-223G · BOEING 777-200LR
- Hex
- 781F03
- Octal
- 36017403
- Decimal
- 7,872,259
- Country
- CN
- Tail
- B-223G
- Type
- B77L
- Flights observed
- 124
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 1h ago
Last known position
Country allocation
The ICAO 24-bit address 781F03 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 |
|---|---|---|---|
| CSG2525 | - | 17 | 2026-05-10 |
| CSG2526 | - | 12 | 2026-05-11 |
| CSG2686 | - | 6 | 2026-05-24 |
| CSG2682 | - | 6 | 2026-05-23 |
| CSG2599 | - | 6 | 2026-05-23 |
| CSG2547 | - | 6 | 2026-05-28 |
| CSG2536 | - | 6 | 2026-04-28 |
| CSG2517 | - | 5 | 2026-04-28 |
| CSG2683 | - | 4 | 2026-05-29 |
| CSG2549 | - | 4 | 2026-05-22 |
| CSG2548 | - | 4 | 2026-05-28 |
| CSG2535 | - | 4 | 2026-04-28 |
| CSG2518 | - | 4 | 2026-04-29 |
| CSG2539 | - | 3 | 2026-05-06 |
| CSG2538 | - | 3 | 2026-05-04 |
| CSG2522 | - | 3 | 2026-05-13 |
| CSG2521 | - | 3 | 2026-05-12 |
| CSG2501 | - | 3 | 2026-05-14 |
| CSG2692 | - | 2 | 2026-04-26 |
| CSG2691 | - | 2 | 2026-04-25 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | CSG2683 | ANC → ORD | May 29, 17:45 UTC | May 29, 23:50 UTC | 6h 5m |
| 2026-05-29 | CSG2683 | - | May 29, 09:05 UTC | May 29, 16:40 UTC | 7h 35m |
| 2026-05-28 | CSG2548 | - | May 28, 23:05 UTC | May 28, 23:20 UTC | 15m |
| 2026-05-28 | CSG2548 | - | May 28, 08:10 UTC | May 28, 21:00 UTC | 12h 50m |
| 2026-05-28 | CSG2547 | - | May 28, 00:45 UTC | May 28, 06:00 UTC | 5h 15m |
| 2026-05-27 | CSG2547 | - | May 27, 15:30 UTC | May 27, 23:15 UTC | 7h 45m |
| 2026-05-27 | CSG2547 | - | May 27, 13:20 UTC | May 27, 13:30 UTC | 10m |
| 2026-05-24 | CSG2686 | - | May 24, 14:30 UTC | May 24, 14:45 UTC | 15m |
| 2026-05-23 | CSG2686 | - | May 23, 23:40 UTC | May 24, 05:50 UTC | 6h 10m |
| 2026-05-23 | CSG2599 | - | May 23, 15:45 UTC | May 23, 21:15 UTC | 5h 30m |
| 2026-05-23 | CSG2599 | - | May 23, 13:10 UTC | May 23, 14:30 UTC | 1h 20m |
| 2026-05-23 | CSG2599 | - | May 23, 04:45 UTC | May 23, 04:55 UTC | 10m |
| 2026-05-23 | CSG2682 | - | May 23, 00:15 UTC | May 23, 00:30 UTC | 15m |
| 2026-05-22 | CSG2682 | - | May 22, 09:40 UTC | May 22, 10:45 UTC | 1h 5m |
| 2026-05-22 | CSG2549 | ANC → ORD | May 22, 02:00 UTC | May 22, 07:15 UTC | 5h 15m |
| 2026-05-21 | CSG2549 | - | May 21, 17:20 UTC | May 22, 00:20 UTC | 7h 0m |
| 2026-05-21 | CSG2548 | - | May 21, 00:00 UTC | May 21, 00:25 UTC | 25m |
| 2026-05-20 | CSG2548 | - | May 20, 09:20 UTC | May 20, 22:00 UTC | 12h 40m |
| 2026-05-20 | CSG2547 | ANC → ORD | May 20, 02:05 UTC | May 20, 07:25 UTC | 5h 21m |
| 2026-05-19 | CSG2547 | - | May 19, 17:45 UTC | May 20, 00:40 UTC | 6h 55m |
| 2026-05-19 | CSG2547 | - | May 19, 15:30 UTC | May 19, 15:40 UTC | 10m |
| 2026-05-19 | CSG2682 | - | May 19, 11:55 UTC | May 19, 12:05 UTC | 10m |
| 2026-05-18 | CSG2682 | - | May 18, 20:40 UTC | May 19, 09:30 UTC | 12h 50m |
| 2026-05-18 | CSG2549 | - | May 18, 11:15 UTC | May 18, 17:25 UTC | 6h 10m |
| 2026-05-18 | CSG2549 | - | May 18, 02:05 UTC | May 18, 09:20 UTC | 7h 15m |
| 2026-05-17 | CSG2686 | - | May 17, 18:10 UTC | May 17, 18:20 UTC | 10m |
| 2026-05-17 | CSG2686 | - | May 17, 03:00 UTC | May 17, 15:50 UTC | 12h 50m |
| 2026-05-16 | CSG2599 | ANC → ORD | May 16, 19:00 UTC | May 17, 00:30 UTC | 5h 30m |
| 2026-05-16 | CSG2599 | - | May 16, 16:10 UTC | May 16, 17:25 UTC | 1h 15m |
| 2026-05-16 | CSG2599 | - | May 16, 07:45 UTC | May 16, 07:55 UTC | 10m |
| 2026-05-15 | CSG2682 | - | May 15, 19:50 UTC | May 15, 20:05 UTC | 15m |
| 2026-05-15 | CSG2682 | - | May 15, 04:50 UTC | May 15, 10:45 UTC | 5h 55m |
| 2026-05-14 | CSG2501 | ANC → ORD | May 14, 20:25 UTC | May 15, 02:10 UTC | 5h 45m |
| 2026-05-14 | CSG2501 | - | May 14, 11:20 UTC | May 14, 19:10 UTC | 7h 50m |
| 2026-05-13 | CSG2501 | - | May 13, 22:35 UTC | May 14, 19:10 UTC | 20h 35m |
| 2026-05-13 | CSG2522 | - | May 13, 14:51 UTC | May 14, 12:50 UTC | 22h 0m |
| 2026-05-13 | CSG2522 | - | May 13, 12:50 UTC | May 14, 12:45 UTC | 23h 55m |
| 2026-05-13 | CSG2522 | - | May 13, 09:10 UTC | May 13, 22:45 UTC | 13h 35m |
| 2026-05-12 | CSG2521 | - | May 12, 22:20 UTC | May 13, 04:45 UTC | 6h 25m |
| 2026-05-12 | CSG2521 | - | May 12, 12:40 UTC | May 12, 19:55 UTC | 7h 15m |
| 2026-05-11 | CSG2521 | - | May 11, 17:05 UTC | May 12, 13:55 UTC | 20h 50m |
| 2026-05-11 | CSG2526 | - | May 11, 14:50 UTC | May 12, 13:55 UTC | 23h 6m |
| 2026-05-11 | CSG2526 | - | May 11, 12:50 UTC | May 12, 12:45 UTC | 23h 56m |
| 2026-05-11 | CSG2526 | - | May 11, 10:20 UTC | May 11, 17:25 UTC | 7h 5m |
| 2026-05-10 | CSG2525 | - | May 10, 23:19 UTC | May 11, 05:15 UTC | 5h 55m |
| 2026-05-10 | CSG2525 | - | May 10, 14:09 UTC | May 10, 21:04 UTC | 6h 55m |
| 2026-05-09 | CSG2525 | - | May 9, 21:14 UTC | May 10, 20:45 UTC | 23h 30m |
| 2026-05-09 | CSG2525 | - | May 9, 14:50 UTC | May 10, 14:45 UTC | 23h 55m |
| 2026-05-09 | CSG2526 | - | May 9, 08:10 UTC | May 9, 21:14 UTC | 13h 5m |
| 2026-05-08 | CSG2525 | - | May 8, 20:55 UTC | May 9, 02:50 UTC | 5h 55m |
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-223G page for operator, model, and routing details .