sensors Mode-S transponder
39AF12
ICAO 24-bit transponder address · allocated to France
Currently assigned to F-HLYS · DASSAULT Falcon 8X
- Hex
- 39AF12
- Octal
- 16327422
- Decimal
- 3,780,370
- Country
- FR
- Tail
- F-HLYS
- Type
- FA8X
- Flights observed
- 21
- Distinct callsigns
- 2
- Country
- FR
- Last broadcast
- 8d ago
Last known position
Country allocation
The ICAO 24-bit address 39AF12 falls within the block assigned to France (FR) by ICAO Annex 10, Volume III. Every aircraft registered in France 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 2 distinct
Recent flights last 21
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-21 | IXR8X | - | May 21, 07:55 UTC | May 21, 20:10 UTC | 12h 15m |
| 2026-05-17 | IXR8X | - | May 17, 18:35 UTC | May 17, 23:10 UTC | 4h 35m |
| 2026-05-17 | IXR8X | - | May 17, 17:10 UTC | May 17, 17:25 UTC | 15m |
| 2026-05-14 | FHLYS | - | May 14, 17:35 UTC | May 14, 18:20 UTC | 45m |
| 2026-05-14 | FHLYS | - | May 14, 15:25 UTC | May 14, 16:40 UTC | 1h 15m |
| 2026-05-13 | FHLYS | LYN → BRU | May 13, 15:25 UTC | May 13, 16:25 UTC | 1h 0m |
| 2026-05-12 | IXR8X | - | May 12, 22:20 UTC | May 13, 02:20 UTC | 4h 0m |
| 2026-05-11 | IXR8X | - | May 11, 02:20 UTC | May 11, 02:35 UTC | 15m |
| 2026-05-10 | IXR8X | - | May 10, 19:05 UTC | May 10, 21:30 UTC | 2h 25m |
| 2026-05-06 | IXR8X | - | May 6, 18:50 UTC | May 7, 04:55 UTC | 10h 5m |
| 2026-05-04 | IXR8X | - | May 4, 12:30 UTC | May 4, 15:15 UTC | 2h 45m |
| 2026-04-30 | IXR8X | - | Apr 30, 17:05 UTC | Apr 30, 17:15 UTC | 10m |
| 2026-04-30 | IXR8X | LYN → FOR | Apr 30, 06:25 UTC | Apr 30, 15:10 UTC | 8h 45m |
| 2026-04-24 | IXR8X | TRN → LYN | Apr 24, 13:15 UTC | Apr 24, 13:45 UTC | 30m |
| 2026-04-24 | IXR8X | LYN → TRN | Apr 24, 05:45 UTC | Apr 24, 06:15 UTC | 30m |
| 2026-04-21 | IXR8X | - | Apr 21, 06:15 UTC | Apr 21, 10:40 UTC | 4h 25m |
| 2026-04-20 | IXR8X | - | Apr 20, 08:35 UTC | Apr 21, 08:30 UTC | 23h 56m |
| 2026-04-20 | IXR8X | - | Apr 20, 06:35 UTC | Apr 21, 06:30 UTC | 23h 55m |
| 2026-04-20 | IXR8X | - | Apr 20, 05:10 UTC | Apr 20, 09:05 UTC | 3h 55m |
| 2026-04-13 | IXR8X | - | Apr 13, 13:05 UTC | Apr 13, 13:50 UTC | 45m |
| 2026-04-13 | IXR8X | LYN → LBG | Apr 13, 08:40 UTC | Apr 13, 09:20 UTC | 40m |
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 F-HLYS page for operator, model, and routing details .