sensors Mode-S transponder
781639
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-306Z · AIRBUS A-320neo
- Hex
- 781639
- Octal
- 36013071
- Decimal
- 7,870,009
- Country
- CN
- Tail
- B-306Z
- Type
- A20N
- Flights observed
- 49
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 19h ago
Last known position
Country allocation
The ICAO 24-bit address 781639 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 |
|---|---|---|---|
| CQH6294 | Spring Airlines | 4 | 2026-05-05 |
| CQH6293 | Spring Airlines | 4 | 2026-05-05 |
| CQH8521 | Spring Airlines | 3 | 2026-05-11 |
| CQH6987 | - | 3 | 2026-05-22 |
| CQH6516 | Spring Airlines | 3 | 2026-04-19 |
| CQH8876 | Spring Airlines | 2 | 2026-05-14 |
| CQH8875 | Spring Airlines | 2 | 2026-05-14 |
| CQH8756 | Spring Airlines | 2 | 2026-05-25 |
| CQH8755 | Spring Airlines | 2 | 2026-05-25 |
| CQH8715 | Spring Airlines | 2 | 2026-05-02 |
| CQH8598 | Spring Airlines | 2 | 2026-05-13 |
| CQH6988 | - | 2 | 2026-05-22 |
| CQH6907 | Spring Airlines | 2 | 2026-05-03 |
| CQH6515 | Spring Airlines | 2 | 2026-04-19 |
| CQH8892 | Spring Airlines | 1 | 2026-05-01 |
| CQH8891 | Spring Airlines | 1 | 2026-04-30 |
| CQH8716 | Spring Airlines | 1 | 2026-05-02 |
| CQH8534 | - | 1 | 2026-04-22 |
| CQH8522 | Spring Airlines | 1 | 2026-05-12 |
| CQH7518 | Spring Airlines | 1 | 2026-04-27 |
Recent flights last 49
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | CQH6538 | FUK → PVG | May 29, 09:15 UTC | May 29, 09:25 UTC | 10m |
| 2026-05-29 | CQH6537 | PVG → FUK | May 29, 07:20 UTC | May 29, 07:40 UTC | 20m |
| 2026-05-27 | CQH6826 | - | May 27, 10:50 UTC | May 27, 13:05 UTC | 2h 15m |
| 2026-05-27 | CQH6825 | - | May 27, 07:15 UTC | May 27, 09:35 UTC | 2h 20m |
| 2026-05-25 | CQH8756 | BKK → PVG | May 25, 19:50 UTC | May 25, 22:10 UTC | 2h 20m |
| 2026-05-25 | CQH8755 | PVG → BKK | May 25, 16:20 UTC | May 25, 18:30 UTC | 2h 10m |
| 2026-05-22 | CQH6988 | - | May 22, 07:35 UTC | May 22, 09:00 UTC | 1h 25m |
| 2026-05-22 | CQH6987 | - | May 22, 04:55 UTC | May 22, 06:20 UTC | 1h 25m |
| 2026-05-20 | CQH6988 | - | May 20, 10:00 UTC | May 20, 11:30 UTC | 1h 30m |
| 2026-05-20 | CQH6987 | - | May 20, 07:30 UTC | May 20, 09:05 UTC | 1h 35m |
| 2026-05-19 | CQH6987 | - | May 19, 09:50 UTC | May 20, 08:15 UTC | 22h 26m |
| 2026-05-14 | CQH8876 | MFM → PVG | May 14, 03:40 UTC | May 14, 04:00 UTC | 20m |
| 2026-05-14 | CQH8875 | PVG → MFM | May 14, 02:00 UTC | May 14, 02:25 UTC | 25m |
| 2026-05-13 | CQH8598 | HKG → PVG | May 13, 08:45 UTC | May 14, 01:10 UTC | 16h 25m |
| 2026-05-12 | CQH8522 | HKT → PVG | May 12, 12:30 UTC | May 13, 03:40 UTC | 15h 10m |
| 2026-05-11 | CQH8521 | PVG → HKT | May 11, 17:10 UTC | May 12, 15:01 UTC | 21h 50m |
| 2026-05-11 | CQH8521 | PVG → HKT | May 11, 14:20 UTC | May 12, 14:15 UTC | 23h 56m |
| 2026-05-11 | CQH8521 | PVG → HKT | May 11, 12:25 UTC | May 11, 18:10 UTC | 5h 45m |
| 2026-05-10 | CQH8598 | HKG → PVG | May 10, 08:54 UTC | May 10, 12:54 UTC | 4h 0m |
| 2026-05-09 | CQH8756 | BKK → PVG | May 9, 19:55 UTC | May 10, 06:35 UTC | 10h 40m |
| 2026-05-09 | CQH8755 | PVG → BKK | May 9, 15:40 UTC | May 9, 18:00 UTC | 2h 20m |
| 2026-05-05 | CQH6294 | BKK → XIY | May 5, 20:05 UTC | May 5, 20:25 UTC | 20m |
| 2026-05-05 | CQH6293 | XIY → BKK | May 5, 17:00 UTC | May 5, 17:25 UTC | 25m |
| 2026-05-04 | CQH6294 | BKK → XIY | May 4, 20:20 UTC | May 5, 17:25 UTC | 21h 5m |
| 2026-05-04 | CQH6293 | XIY → BKK | May 4, 17:10 UTC | May 4, 18:05 UTC | 55m |
| 2026-05-03 | CQH6907 | SHE → HFE | May 3, 03:50 UTC | May 3, 14:40 UTC | 10h 50m |
| 2026-05-02 | CQH6907 | SHE → HFE | May 2, 06:25 UTC | May 3, 03:55 UTC | 21h 29m |
| 2026-05-02 | CQH8716 | HKG → PVG | May 2, 05:30 UTC | May 3, 03:55 UTC | 22h 24m |
| 2026-05-02 | CQH8715 | PVG → HKG | May 2, 03:30 UTC | May 2, 03:50 UTC | 20m |
| 2026-05-01 | CQH8715 | PVG → HKG | May 1, 08:55 UTC | May 2, 02:55 UTC | 18h 0m |
| 2026-05-01 | CQH8892 | BKK → PVG | May 1, 06:45 UTC | May 2, 02:55 UTC | 20h 10m |
| 2026-04-30 | CQH8891 | PVG → BKK | Apr 30, 13:35 UTC | May 1, 04:40 UTC | 15h 5m |
| 2026-04-27 | CQH7206 | CJU → PKX | Apr 27, 13:35 UTC | Apr 27, 14:15 UTC | 40m |
| 2026-04-27 | CQH7205 | PKX → CJU | Apr 27, 11:20 UTC | Apr 27, 11:40 UTC | 20m |
| 2026-04-27 | CQH7518 | LHW → PKX | Apr 27, 07:35 UTC | Apr 27, 07:45 UTC | 10m |
| 2026-04-23 | CQH8876 | MFM → PVG | Apr 23, 03:55 UTC | Apr 23, 12:50 UTC | 8h 55m |
| 2026-04-23 | CQH8875 | PVG → MFM | Apr 23, 02:05 UTC | Apr 23, 02:20 UTC | 15m |
| 2026-04-22 | CQH8534 | - | Apr 22, 17:55 UTC | Apr 23, 01:15 UTC | 7h 20m |
| 2026-04-19 | CQH6516 | KUL → PVG | Apr 19, 17:15 UTC | Apr 19, 20:05 UTC | 2h 50m |
| 2026-04-19 | CQH6516 | KUL → PVG | Apr 19, 16:05 UTC | Apr 19, 16:25 UTC | 20m |
| 2026-04-19 | CQH6515 | PVG → KUL | Apr 19, 13:40 UTC | Apr 19, 14:05 UTC | 25m |
| 2026-04-19 | CQH6515 | PVG → KUL | Apr 19, 09:35 UTC | Apr 19, 12:40 UTC | 3h 5m |
| 2026-04-17 | CQH6300 | - | Apr 17, 12:50 UTC | Apr 17, 13:05 UTC | 15m |
| 2026-04-17 | CQH6299 | XIY → BKK | Apr 17, 11:00 UTC | Apr 17, 11:15 UTC | 15m |
| 2026-04-15 | CQH6294 | BKK → XIY | Apr 15, 20:10 UTC | Apr 15, 20:35 UTC | 25m |
| 2026-04-15 | CQH6293 | XIY → BKK | Apr 15, 17:10 UTC | Apr 15, 17:40 UTC | 30m |
| 2026-04-14 | CQH6294 | BKK → XIY | Apr 14, 20:05 UTC | Apr 14, 20:35 UTC | 30m |
| 2026-04-14 | CQH6293 | XIY → BKK | Apr 14, 17:10 UTC | Apr 14, 17:45 UTC | 35m |
| 2026-04-12 | CQH6516 | KUL → PVG | Apr 12, 19:00 UTC | Apr 12, 19:55 UTC | 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-306Z page for operator, model, and routing details .