sensors Mode-S transponder
780421
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-5479 · BOEING 737-800
- Hex
- 780421
- Octal
- 36002041
- Decimal
- 7,865,377
- Country
- CN
- Tail
- B-5479
- Type
- B738
- Flights observed
- 37
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 1h ago
Last known position
Country allocation
The ICAO 24-bit address 780421 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 |
|---|---|---|---|
| CHH7320 | Hainan Airlines | 5 | 2026-04-21 |
| CHH7137 | Hainan Airlines | 2 | 2026-05-27 |
| CHH7078 | Hainan Airlines | 2 | 2026-05-16 |
| CHH7801 | Hainan Airlines | 1 | 2026-05-09 |
| CHH7777 | Hainan Airlines | 1 | 2026-05-30 |
| CHH7741 | Hainan Airlines | 1 | 2026-05-12 |
| CHH7688 | Hainan Airlines | 1 | 2026-05-06 |
| CHH7687 | Hainan Airlines | 1 | 2026-04-21 |
| CHH7654 | Hainan Airlines | 1 | 2026-04-20 |
| CHH7567 | Hainan Airlines | 1 | 2026-05-03 |
| CHH7547 | Hainan Airlines | 1 | 2026-05-26 |
| CHH7386 | Hainan Airlines | 1 | 2026-04-14 |
| CHH7385 | Hainan Airlines | 1 | 2026-04-14 |
| CHH7289 | Hainan Airlines | 1 | 2026-05-09 |
| CHH7282 | Hainan Airlines | 1 | 2026-05-06 |
| CHH7247 | Hainan Airlines | 1 | 2026-05-27 |
| CHH7238 | Hainan Airlines | 1 | 2026-05-04 |
| CHH7237 | Hainan Airlines | 1 | 2026-05-04 |
| CHH7216 | Hainan Airlines | 1 | 2026-04-17 |
| CHH7215 | Hainan Airlines | 1 | 2026-04-17 |
Recent flights last 37
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | CHH7777 | PEK → BAR | May 30, 06:05 UTC | May 30, 06:15 UTC | 10m |
| 2026-05-30 | CHH7138 | XIY → PEK | May 30, 03:55 UTC | May 30, 04:15 UTC | 20m |
| 2026-05-27 | CHH7137 | PEK → XIY | May 27, 23:00 UTC | May 27, 23:15 UTC | 15m |
| 2026-05-27 | CHH7247 | PEK → TFU | May 27, 05:09 UTC | May 27, 05:29 UTC | 20m |
| 2026-05-26 | CHH7547 | PEK → TFU | May 26, 12:10 UTC | May 26, 12:24 UTC | 15m |
| 2026-05-19 | CHH7137 | PEK → XIY | May 19, 23:20 UTC | May 19, 23:30 UTC | 10m |
| 2026-05-16 | CHH7078 | KHN → HAK | May 16, 09:45 UTC | May 17, 03:50 UTC | 18h 5m |
| 2026-05-16 | CHH7077 | HAK → KHN | May 16, 06:31 UTC | May 17, 03:50 UTC | 21h 19m |
| 2026-05-12 | CHH7741 | SZX → KWE | May 12, 03:55 UTC | May 12, 04:05 UTC | 10m |
| 2026-05-09 | CHH7289 | PEK → KWE | May 9, 23:35 UTC | May 10, 00:00 UTC | 25m |
| 2026-05-09 | CHH7801 | PEK → CAN | May 9, 01:00 UTC | May 9, 01:15 UTC | 15m |
| 2026-05-08 | CHH6012 | XIY → PEK | May 8, 13:50 UTC | May 8, 14:05 UTC | 15m |
| 2026-05-06 | CHH7688 | NGB → HAK | May 6, 23:45 UTC | May 7, 10:05 UTC | 10h 20m |
| 2026-05-06 | CHH7282 | PEK → HAK | May 6, 13:10 UTC | May 7, 10:05 UTC | 20h 55m |
| 2026-05-06 | CHH7081 | HAK → PEK | May 6, 11:10 UTC | May 6, 11:20 UTC | 10m |
| 2026-05-06 | CHH7164 | NKG → SZX | May 6, 00:01 UTC | May 6, 05:25 UTC | 5h 25m |
| 2026-05-05 | CHH7123 | PEK → JXA | May 5, 12:05 UTC | May 5, 12:15 UTC | 10m |
| 2026-05-05 | CHH6009 | YNT → HAK | May 5, 00:30 UTC | May 5, 00:40 UTC | 10m |
| 2026-05-04 | CHH7134 | - | May 4, 16:20 UTC | May 4, 16:40 UTC | 20m |
| 2026-05-04 | CHH7133 | - | May 4, 12:20 UTC | May 4, 12:40 UTC | 20m |
| 2026-05-04 | CHH7238 | XIY → PEK | May 4, 08:10 UTC | May 4, 08:30 UTC | 20m |
| 2026-05-04 | CHH7237 | PEK → XIY | May 4, 03:35 UTC | May 4, 03:54 UTC | 20m |
| 2026-05-03 | CHH7567 | PEK → CKG | May 3, 11:10 UTC | May 3, 11:30 UTC | 20m |
| 2026-04-29 | CHH7078 | KHN → HAK | Apr 29, 00:40 UTC | Apr 29, 11:45 UTC | 11h 6m |
| 2026-04-21 | CHH7320 | PVG → HAK | Apr 21, 09:55 UTC | Apr 22, 02:30 UTC | 16h 35m |
| 2026-04-21 | CHH7687 | NGB → TAO | Apr 21, 00:00 UTC | Apr 21, 12:45 UTC | 12h 45m |
| 2026-04-20 | CHH7654 | JUH → TYN | Apr 20, 02:30 UTC | Apr 20, 15:50 UTC | 13h 20m |
| 2026-04-19 | CHH7320 | PVG → HAK | Apr 19, 12:40 UTC | Apr 20, 12:15 UTC | 23h 35m |
| 2026-04-19 | CHH7320 | PVG → HAK | Apr 19, 02:15 UTC | Apr 19, 12:45 UTC | 10h 30m |
| 2026-04-18 | CHH7320 | PVG → HAK | Apr 18, 12:30 UTC | Apr 19, 02:30 UTC | 14h 0m |
| 2026-04-18 | CHH7320 | PVG → HAK | Apr 18, 02:45 UTC | Apr 18, 03:05 UTC | 20m |
| 2026-04-17 | CHH7216 | NKG → HAK | Apr 17, 09:55 UTC | Apr 17, 10:20 UTC | 25m |
| 2026-04-17 | CHH7215 | HAK → NKG | Apr 17, 05:20 UTC | Apr 17, 05:30 UTC | 10m |
| 2026-04-15 | CHH7120 | PVG → HAK | Apr 15, 09:30 UTC | Apr 15, 10:55 UTC | 1h 25m |
| 2026-04-15 | CHH7119 | HAK → PVG | Apr 15, 05:05 UTC | Apr 15, 05:20 UTC | 15m |
| 2026-04-14 | CHH7386 | HGH → SYX | Apr 14, 09:50 UTC | Apr 14, 10:10 UTC | 20m |
| 2026-04-14 | CHH7385 | SYX → HGH | Apr 14, 05:35 UTC | Apr 14, 05:55 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-5479 page for operator, model, and routing details .