sensors Mode-S transponder
78239B
ICAO 24-bit transponder address · allocated to China
- Hex
- 78239B
- Octal
- 36021633
- Decimal
- 7,873,435
- Country
- CN
- Flights observed
- 36
- Distinct callsigns
- 13
- Country
- CN
- Last broadcast
- 25d ago
Last known position
Country allocation
The ICAO 24-bit address 78239B 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 13 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CHH7384 | - | 8 | 2026-07-07 |
| CHH7383 | - | 6 | 2026-07-08 |
| CHH7306 | - | 3 | 2026-07-17 |
| CHH7305 | Hainan Airlines | 3 | 2026-07-18 |
| CHH7304 | - | 3 | 2026-07-05 |
| CHH7579 | - | 2 | 2026-07-16 |
| CHH7390 | - | 2 | 2026-07-13 |
| CHH7364 | - | 2 | 2026-07-21 |
| CHH6054 | - | 2 | 2026-07-13 |
| CHH7360 | Hainan Airlines | 1 | 2026-07-21 |
| CHH7310 | - | 1 | 2026-06-29 |
| CHH7280 | - | 1 | 2026-07-12 |
| CHH2996 | - | 1 | 2026-06-15 |
Recent flights last 36
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-21 | CHH7364 | - | Jul 21, 17:25 UTC | Jul 21, 17:40 UTC | 15m |
| 2026-07-21 | CHH7360 | KWE → SYX | Jul 21, 09:20 UTC | Jul 21, 09:40 UTC | 20m |
| 2026-07-19 | - | - | Jul 19, 12:15 UTC | Jul 19, 12:25 UTC | 10m |
| 2026-07-18 | CHH7305 | SYX → TNA | Jul 18, 01:05 UTC | Jul 18, 07:45 UTC | 6h 41m |
| 2026-07-17 | CHH7306 | - | Jul 17, 07:00 UTC | Jul 18, 01:15 UTC | 18h 15m |
| 2026-07-16 | CHH7579 | - | Jul 16, 13:25 UTC | Jul 17, 07:14 UTC | 17h 50m |
| 2026-07-15 | CHH7306 | - | Jul 15, 07:20 UTC | Jul 16, 01:10 UTC | 17h 50m |
| 2026-07-15 | CHH7305 | - | Jul 15, 01:00 UTC | Jul 15, 14:45 UTC | 13h 45m |
| 2026-07-13 | CHH7390 | - | Jul 13, 14:30 UTC | Jul 14, 07:20 UTC | 16h 50m |
| 2026-07-13 | CHH7390 | - | Jul 13, 10:05 UTC | Jul 14, 07:20 UTC | 21h 15m |
| 2026-07-13 | CHH6054 | - | Jul 13, 01:01 UTC | Jul 13, 14:35 UTC | 13h 35m |
| 2026-07-12 | CHH6054 | - | Jul 12, 16:15 UTC | Jul 13, 14:35 UTC | 22h 20m |
| 2026-07-12 | CHH7579 | - | Jul 12, 13:25 UTC | Jul 13, 10:05 UTC | 20h 40m |
| 2026-07-12 | CHH7280 | - | Jul 12, 08:35 UTC | Jul 12, 08:50 UTC | 15m |
| 2026-07-11 | CHH7306 | - | Jul 11, 01:10 UTC | Jul 11, 07:10 UTC | 6h 0m |
| 2026-07-10 | CHH7305 | - | Jul 10, 01:15 UTC | Jul 10, 01:25 UTC | 10m |
| 2026-07-08 | CHH7383 | - | Jul 8, 10:15 UTC | Jul 8, 15:45 UTC | 5h 30m |
| 2026-07-07 | CHH7384 | - | Jul 7, 14:35 UTC | Jul 8, 07:10 UTC | 16h 35m |
| 2026-07-07 | CHH7384 | - | Jul 7, 11:00 UTC | Jul 8, 07:10 UTC | 20h 10m |
| 2026-07-07 | CHH7383 | - | Jul 7, 10:00 UTC | Jul 8, 07:10 UTC | 21h 10m |
| 2026-07-06 | CHH7383 | - | Jul 6, 15:30 UTC | Jul 7, 11:00 UTC | 19h 30m |
| 2026-07-06 | CHH7383 | - | Jul 6, 10:20 UTC | Jul 6, 15:40 UTC | 5h 20m |
| 2026-07-05 | CHH7383 | - | Jul 5, 16:50 UTC | Jul 6, 15:40 UTC | 22h 50m |
| 2026-07-05 | CHH7304 | - | Jul 5, 07:05 UTC | Jul 5, 07:30 UTC | 25m |
| 2026-07-02 | CHH7384 | - | Jul 2, 15:40 UTC | Jul 3, 07:10 UTC | 15h 30m |
| 2026-07-02 | CHH7384 | - | Jul 2, 10:55 UTC | Jul 3, 07:10 UTC | 20h 15m |
| 2026-07-02 | CHH7384 | - | Jul 2, 10:10 UTC | Jul 3, 07:10 UTC | 21h 0m |
| 2026-07-02 | CHH7384 | - | Jul 2, 00:45 UTC | Jul 2, 16:10 UTC | 15h 25m |
| 2026-07-01 | CHH7383 | - | Jul 1, 15:05 UTC | Jul 2, 11:10 UTC | 20h 5m |
| 2026-07-01 | CHH7384 | - | Jul 1, 14:30 UTC | Jul 2, 11:10 UTC | 20h 40m |
| 2026-07-01 | CHH7384 | - | Jul 1, 10:00 UTC | Jul 2, 00:50 UTC | 14h 50m |
| 2026-07-01 | CHH7304 | - | Jul 1, 06:15 UTC | Jul 2, 00:50 UTC | 18h 35m |
| 2026-07-01 | CHH7304 | - | Jul 1, 01:30 UTC | Jul 2, 00:45 UTC | 23h 15m |
| 2026-06-30 | CHH7364 | - | Jun 30, 15:00 UTC | Jun 30, 15:20 UTC | 20m |
| 2026-06-29 | CHH7310 | - | Jun 29, 15:34 UTC | Jun 30, 09:35 UTC | 18h 0m |
| 2026-06-15 | CHH2996 | - | Jun 15, 10:24 UTC | Jun 15, 14:30 UTC | 4h 5m |
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.