sensors Mode-S transponder
780DD5
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-1797 · BOEING 737-800
- Hex
- 780DD5
- Octal
- 36006725
- Decimal
- 7,867,861
- Country
- CN
- Tail
- B-1797
- Type
- B738
- Flights observed
- 28
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 40m ago
Last known position
Country allocation
The ICAO 24-bit address 780DD5 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 |
|---|---|---|---|
| CHH7638 | Hainan Airlines | 3 | 2026-05-15 |
| CHH7321 | Hainan Airlines | 3 | 2026-05-29 |
| CHH7312 | Hainan Airlines | 2 | 2026-05-23 |
| CHH7982 | - | 1 | 2026-04-14 |
| CHH7815 | Hainan Airlines | 1 | 2026-05-17 |
| CHH7805 | Hainan Airlines | 1 | 2026-06-03 |
| CHH7776 | - | 1 | 2026-04-23 |
| CHH7765 | Hainan Airlines | 1 | 2026-05-07 |
| CHH7750 | Hainan Airlines | 1 | 2026-05-24 |
| CHH7744 | Hainan Airlines | 1 | 2026-05-24 |
| CHH7743 | Hainan Airlines | 1 | 2026-05-23 |
| CHH7644 | Hainan Airlines | 1 | 2026-04-20 |
| CHH7506 | Hainan Airlines | 1 | 2026-04-29 |
| CHH7505 | Hainan Airlines | 1 | 2026-04-29 |
| CHH7386 | Hainan Airlines | 1 | 2026-05-27 |
| CHH7319 | Hainan Airlines | 1 | 2026-05-31 |
| CHH720 | Hainan Airlines | 1 | 2026-04-26 |
| CHH719 | Hainan Airlines | 1 | 2026-04-26 |
| CHH7145 | Hainan Airlines | 1 | 2026-04-29 |
| CHH7066 | Hainan Airlines | 1 | 2026-04-18 |
Recent flights last 28
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-03 | CHH7805 | PEK → CAN | Jun 3, 02:45 UTC | Jun 3, 03:05 UTC | 20m |
| 2026-05-31 | CHH7319 | HAK → PVG | May 31, 09:20 UTC | Jun 1, 05:10 UTC | 19h 50m |
| 2026-05-29 | CHH7321 | SYX → PVG | May 29, 15:20 UTC | May 30, 10:45 UTC | 19h 25m |
| 2026-05-29 | CHH7321 | SYX → PVG | May 29, 15:00 UTC | May 30, 10:45 UTC | 19h 45m |
| 2026-05-29 | CHH7321 | SYX → PVG | May 29, 10:20 UTC | May 30, 04:35 UTC | 18h 15m |
| 2026-05-27 | CHH7386 | HGH → SYX | May 27, 15:40 UTC | May 28, 10:35 UTC | 18h 55m |
| 2026-05-24 | CHH7750 | SZX → SYX | May 24, 15:20 UTC | May 24, 15:35 UTC | 15m |
| 2026-05-24 | CHH7744 | SZX → LIY | May 24, 13:05 UTC | May 24, 13:25 UTC | 20m |
| 2026-05-23 | CHH7743 | NGB → CGQ | May 23, 23:55 UTC | May 24, 00:05 UTC | 10m |
| 2026-05-23 | CHH7312 | KHN → SYX | May 23, 01:40 UTC | May 23, 12:05 UTC | 10h 24m |
| 2026-05-22 | CHH7312 | KHN → SYX | May 22, 14:40 UTC | May 23, 12:05 UTC | 21h 25m |
| 2026-05-17 | CHH7815 | PEK → CAN | May 17, 12:40 UTC | May 18, 01:55 UTC | 13h 15m |
| 2026-05-15 | CHH7638 | ZUH → CGO | May 15, 09:40 UTC | May 15, 09:50 UTC | 10m |
| 2026-05-08 | CHH7026 | SZX → HAK | May 8, 13:35 UTC | May 8, 13:45 UTC | 10m |
| 2026-05-07 | CHH7765 | SZX → FUG | May 7, 22:54 UTC | May 7, 23:05 UTC | 10m |
| 2026-04-29 | CHH7145 | PEK → URC | Apr 29, 23:45 UTC | Apr 30, 00:00 UTC | 15m |
| 2026-04-29 | CHH7506 | CGO → HRB | Apr 29, 11:20 UTC | Apr 29, 11:35 UTC | 15m |
| 2026-04-29 | CHH7505 | HRB → CGO | Apr 29, 00:50 UTC | Apr 29, 00:59 UTC | 10m |
| 2026-04-26 | CHH720 | HKG → HAK | Apr 26, 08:15 UTC | Apr 26, 08:30 UTC | 15m |
| 2026-04-26 | CHH719 | HAK → HKG | Apr 26, 06:20 UTC | Apr 26, 06:40 UTC | 20m |
| 2026-04-26 | CHH706 | HKG → HAK | Apr 26, 02:15 UTC | Apr 26, 02:25 UTC | 10m |
| 2026-04-26 | CHH705 | HAK → HKG | Apr 26, 00:15 UTC | Apr 26, 00:20 UTC | 5m |
| 2026-04-23 | CHH7776 | - | Apr 23, 20:10 UTC | Apr 23, 20:20 UTC | 10m |
| 2026-04-22 | CHH7638 | ZUH → CGO | Apr 22, 06:35 UTC | Apr 22, 06:55 UTC | 20m |
| 2026-04-21 | CHH7638 | ZUH → CGO | Apr 21, 05:50 UTC | Apr 21, 06:00 UTC | 10m |
| 2026-04-20 | CHH7644 | ZUH → HFE | Apr 20, 08:20 UTC | Apr 20, 08:30 UTC | 10m |
| 2026-04-18 | CHH7066 | WUH → HAK | Apr 18, 05:10 UTC | Apr 18, 05:20 UTC | 10m |
| 2026-04-14 | CHH7982 | - | Apr 14, 05:35 UTC | Apr 14, 05:45 UTC | 10m |
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-1797 page for operator, model, and routing details .