sensors Mode-S transponder
781273
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-1340 · BOEING 747-400
- Hex
- 781273
- Octal
- 36011163
- Decimal
- 7,869,043
- Country
- CN
- Tail
- B-1340
- Type
- B744
- Flights observed
- 221
- Distinct callsigns
- 17
- Country
- CN
- Last broadcast
- Jul 26, 22:45 UTC
Last known position
Country allocation
The ICAO 24-bit address 781273 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 17 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| YZR7453 | Yangtze River Express | 82 | 2026-07-24 |
| YZR7482 | Yangtze River Express | 47 | 2026-07-25 |
| YZR7439 | - | 30 | 2026-07-21 |
| YZR7462 | Yangtze River Express | 12 | 2026-06-15 |
| YZR7461 | Yangtze River Express | 8 | 2026-06-14 |
| YZR7459 | Yangtze River Express | 8 | 2026-05-28 |
| YZR7440 | - | 8 | 2026-07-21 |
| YZR7413 | Yangtze River Express | 6 | 2026-05-01 |
| YZR7460 | Yangtze River Express | 4 | 2026-07-26 |
| YZR7455 | - | 4 | 2026-07-10 |
| YZR7414 | - | 4 | 2026-04-14 |
| YZR7463 | Yangtze River Express | 3 | 2026-07-26 |
| YZR7499 | - | 1 | 2026-06-23 |
| YZR7466 | - | 1 | 2026-07-16 |
| YZR7456 | - | 1 | 2026-07-06 |
| YZR7441 | - | 1 | 2026-06-23 |
| YZR7416 | Yangtze River Express | 1 | 2026-05-02 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | YZR7460 | DFW → PVG | Jul 26, 22:25 UTC | Jul 26, 22:45 UTC | 20m |
| 2026-07-26 | YZR7463 | PVG → LAX | Jul 26, 14:25 UTC | Jul 26, 19:05 UTC | 4h 40m |
| 2026-07-25 | YZR7463 | PVG → LAX | Jul 25, 14:50 UTC | Jul 26, 10:25 UTC | 19h 36m |
| 2026-07-25 | YZR7463 | PVG → LAX | Jul 25, 08:50 UTC | Jul 26, 08:45 UTC | 23h 56m |
| 2026-07-25 | YZR7482 | ORD → NKG | Jul 25, 07:35 UTC | Jul 26, 04:25 UTC | 20h 50m |
| 2026-07-25 | YZR7482 | ORD → NKG | Jul 25, 02:20 UTC | Jul 25, 15:00 UTC | 12h 40m |
| 2026-07-24 | YZR7453 | ANC → ORD | Jul 24, 17:00 UTC | Jul 24, 22:05 UTC | 5h 5m |
| 2026-07-24 | YZR7453 | ANC → ORD | Jul 24, 01:20 UTC | Jul 24, 15:35 UTC | 14h 15m |
| 2026-07-23 | YZR7453 | ANC → ORD | Jul 23, 18:50 UTC | Jul 24, 15:35 UTC | 20h 45m |
| 2026-07-23 | YZR7453 | ANC → ORD | Jul 23, 18:10 UTC | Jul 24, 15:35 UTC | 21h 25m |
| 2026-07-23 | YZR7453 | ANC → ORD | Jul 23, 14:50 UTC | Jul 24, 14:45 UTC | 23h 55m |
| 2026-07-23 | YZR7482 | ORD → NKG | Jul 23, 12:50 UTC | Jul 24, 09:55 UTC | 21h 5m |
| 2026-07-23 | YZR7453 | ANC → ORD | Jul 23, 03:15 UTC | Jul 23, 08:15 UTC | 5h 0m |
| 2026-07-22 | YZR7453 | ANC → ORD | Jul 22, 18:25 UTC | Jul 23, 01:40 UTC | 7h 15m |
| 2026-07-22 | YZR7453 | ANC → ORD | Jul 22, 05:15 UTC | Jul 23, 01:40 UTC | 20h 25m |
| 2026-07-21 | YZR7439 | - | Jul 21, 05:40 UTC | Jul 21, 23:00 UTC | 17h 20m |
| 2026-07-21 | YZR7440 | - | Jul 21, 02:55 UTC | Jul 21, 23:00 UTC | 20h 5m |
| 2026-07-20 | YZR7439 | - | Jul 20, 23:00 UTC | Jul 20, 23:15 UTC | 15m |
| 2026-07-20 | YZR7482 | ORD → NKG | Jul 20, 01:25 UTC | Jul 20, 20:25 UTC | 19h 0m |
| 2026-07-19 | YZR7482 | ORD → NKG | Jul 19, 20:50 UTC | Jul 20, 20:25 UTC | 23h 35m |
| 2026-07-19 | YZR7482 | ORD → NKG | Jul 19, 20:10 UTC | Jul 20, 18:15 UTC | 22h 5m |
| 2026-07-19 | YZR7453 | ANC → ORD | Jul 19, 11:25 UTC | Jul 19, 16:45 UTC | 5h 20m |
| 2026-07-19 | YZR7453 | ANC → ORD | Jul 19, 02:10 UTC | Jul 19, 09:25 UTC | 7h 15m |
| 2026-07-16 | YZR7466 | - | Jul 16, 08:45 UTC | Jul 16, 14:05 UTC | 5h 20m |
| 2026-07-16 | YZR7439 | - | Jul 16, 05:15 UTC | Jul 16, 05:25 UTC | 10m |
| 2026-07-15 | YZR7439 | - | Jul 15, 23:45 UTC | Jul 16, 00:35 UTC | 50m |
| 2026-07-14 | YZR7482 | - | Jul 14, 11:30 UTC | Jul 15, 00:40 UTC | 13h 9m |
| 2026-07-14 | YZR7453 | - | Jul 14, 03:10 UTC | Jul 14, 08:20 UTC | 5h 10m |
| 2026-07-13 | YZR7453 | - | Jul 13, 12:30 UTC | Jul 14, 01:25 UTC | 12h 55m |
| 2026-07-13 | YZR7453 | - | Jul 13, 05:05 UTC | Jul 14, 01:25 UTC | 20h 20m |
| 2026-07-13 | YZR7453 | - | Jul 13, 00:50 UTC | Jul 14, 00:45 UTC | 23h 55m |
| 2026-07-12 | YZR7482 | - | Jul 12, 23:45 UTC | Jul 13, 19:35 UTC | 19h 50m |
| 2026-07-12 | YZR7453 | ANC → ORD | Jul 12, 15:01 UTC | Jul 12, 20:20 UTC | 5h 20m |
| 2026-07-12 | YZR7453 | - | Jul 12, 06:15 UTC | Jul 12, 13:40 UTC | 7h 25m |
| 2026-07-11 | YZR7453 | - | Jul 11, 16:50 UTC | Jul 12, 13:40 UTC | 20h 50m |
| 2026-07-10 | YZR7482 | - | Jul 10, 16:00 UTC | Jul 11, 08:30 UTC | 16h 30m |
| 2026-07-10 | YZR7482 | - | Jul 10, 10:50 UTC | Jul 11, 08:30 UTC | 21h 40m |
| 2026-07-10 | YZR7455 | ANC → ORD | Jul 10, 02:10 UTC | Jul 10, 07:30 UTC | 5h 20m |
| 2026-07-09 | YZR7455 | - | Jul 9, 16:55 UTC | Jul 10, 00:25 UTC | 7h 30m |
| 2026-07-06 | YZR7456 | - | Jul 6, 13:05 UTC | Jul 7, 01:55 UTC | 12h 50m |
| 2026-07-06 | YZR7453 | - | Jul 6, 04:30 UTC | Jul 6, 09:45 UTC | 5h 15m |
| 2026-07-05 | YZR7453 | - | Jul 5, 09:05 UTC | Jul 6, 03:00 UTC | 17h 55m |
| 2026-07-05 | YZR7453 | - | Jul 5, 04:50 UTC | Jul 6, 03:00 UTC | 22h 10m |
| 2026-07-05 | YZR7453 | - | Jul 5, 04:05 UTC | Jul 6, 02:45 UTC | 22h 40m |
| 2026-07-04 | YZR7439 | - | Jul 4, 23:55 UTC | Jul 5, 00:10 UTC | 15m |
| 2026-07-04 | YZR7439 | - | Jul 4, 18:30 UTC | Jul 4, 19:00 UTC | 30m |
| 2026-07-03 | YZR7439 | - | Jul 3, 23:45 UTC | Jul 4, 19:00 UTC | 19h 15m |
| 2026-07-03 | YZR7482 | - | Jul 3, 11:30 UTC | Jul 3, 23:55 UTC | 12h 25m |
| 2026-07-02 | YZR7453 | ANC → ORD | Jul 2, 16:10 UTC | Jul 2, 21:55 UTC | 5h 45m |
| 2026-07-01 | YZR7453 | - | Jul 1, 23:20 UTC | Jul 2, 14:50 UTC | 15h 30m |
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-1340 page for operator, model, and routing details .