sensors Mode-S transponder
781521
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-302W · AIRBUS A-320neo
- Hex
- 781521
- Octal
- 36012441
- Decimal
- 7,869,729
- Country
- CN
- Tail
- B-302W
- Type
- A20N
- Flights observed
- 13
- Distinct callsigns
- 10
- Country
- CN
- Last broadcast
- 9h ago
Last known position
Country allocation
The ICAO 24-bit address 781521 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 10 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CES6551 | - | 3 | 2026-06-28 |
| CES6919 | - | 2 | 2026-07-13 |
| CES6328 | China Eastern Airlines | 1 | 2026-04-14 |
| CES6302 | China Eastern Airlines | 1 | 2026-04-14 |
| CES5240 | - | 1 | 2026-07-02 |
| CES5239 | - | 1 | 2026-07-02 |
| CES5023 | - | 1 | 2026-06-30 |
| CES2332 | China Eastern Airlines | 1 | 2026-04-16 |
| CES2331 | China Eastern Airlines | 1 | 2026-04-16 |
| CES2258 | - | 1 | 2026-07-07 |
Recent flights last 13
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | CES6919 | - | Jul 13, 16:25 UTC | Jul 14, 00:50 UTC | 8h 25m |
| 2026-07-10 | CES6919 | - | Jul 10, 16:20 UTC | Jul 10, 23:45 UTC | 7h 25m |
| 2026-07-07 | CES2258 | - | Jul 7, 12:20 UTC | Jul 7, 12:35 UTC | 15m |
| 2026-07-02 | CES5240 | - | Jul 2, 13:25 UTC | Jul 2, 13:40 UTC | 15m |
| 2026-07-02 | CES5239 | - | Jul 2, 10:35 UTC | Jul 2, 11:40 UTC | 1h 5m |
| 2026-06-30 | CES5023 | - | Jun 30, 13:55 UTC | Jul 1, 06:00 UTC | 16h 5m |
| 2026-06-28 | CES6551 | - | Jun 28, 11:45 UTC | Jun 28, 16:00 UTC | 4h 15m |
| 2026-06-27 | CES6551 | - | Jun 27, 15:30 UTC | Jun 28, 12:09 UTC | 20h 40m |
| 2026-06-27 | CES6551 | - | Jun 27, 11:25 UTC | Jun 27, 15:39 UTC | 4h 15m |
| 2026-04-16 | CES2332 | PVG → TYN | Apr 16, 07:29 UTC | Apr 16, 07:49 UTC | 20m |
| 2026-04-16 | CES2331 | TYN → PVG | Apr 16, 05:49 UTC | Apr 16, 06:05 UTC | 15m |
| 2026-04-14 | CES6302 | CAN → PKX | Apr 14, 23:50 UTC | Apr 15, 00:00 UTC | 10m |
| 2026-04-14 | CES6328 | ZHA → PVG | Apr 14, 05:15 UTC | Apr 14, 05:35 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-302W page for operator, model, and routing details .