sensors Mode-S transponder
4D0109
ICAO 24-bit transponder address · allocated to Luxembourg
Currently assigned to LX-TCV · BOEING 747-400
- Hex
- 4D0109
- Octal
- 23200411
- Decimal
- 5,046,537
- Country
- LU
- Tail
- LX-TCV
- Type
- B744
- Flights observed
- 88
- Distinct callsigns
- 20
- Country
- LU
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 4D0109 falls within the block assigned to Luxembourg (LU) by ICAO Annex 10, Volume III. Every aircraft registered in Luxembourg 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 |
|---|---|---|---|
| CLX8 | - | 10 | 2026-05-10 |
| CLX9723 | Cargolux | 6 | 2026-05-13 |
| CLX75V | Cargolux | 5 | 2026-05-08 |
| CLX42 | - | 5 | 2026-05-15 |
| CLX57R | Cargolux | 4 | 2026-05-11 |
| CLX48 | - | 4 | 2026-04-13 |
| CLX58 | - | 3 | 2026-05-09 |
| CLX56 | - | 3 | 2026-05-17 |
| ICV736 | - | 2 | 2026-05-19 |
| ICV67 | Cargolux Italia | 2 | 2026-05-18 |
| CLX9872 | Cargolux | 2 | 2026-05-27 |
| CLX97C | Cargolux | 2 | 2026-05-21 |
| CLX9726 | Cargolux | 2 | 2026-05-16 |
| CLX87C | Cargolux | 2 | 2026-05-31 |
| CLX78Y | Cargolux | 2 | 2026-04-18 |
| CLX7545 | Cargolux | 2 | 2026-05-29 |
| CLX7 | - | 2 | 2026-05-21 |
| CLX6697 | Cargolux | 2 | 2026-05-26 |
| CLX6694 | Cargolux | 2 | 2026-05-01 |
| CLX6 | - | 2 | 2026-06-01 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-01 | CLX72W | PIK → LUX | Jun 1, 04:25 UTC | Jun 1, 12:15 UTC | 7h 50m |
| 2026-06-01 | CLX6 | - | Jun 1, 00:25 UTC | Jun 1, 02:00 UTC | 1h 35m |
| 2026-05-31 | CLX6 | - | May 31, 12:50 UTC | May 31, 22:25 UTC | 9h 35m |
| 2026-05-31 | CLX87C | ATL → LUX | May 31, 08:25 UTC | May 31, 10:05 UTC | 1h 40m |
| 2026-05-30 | CLX4 | - | May 30, 13:50 UTC | May 30, 22:30 UTC | 8h 40m |
| 2026-05-29 | CLX901 | - | May 29, 21:35 UTC | May 30, 08:50 UTC | 11h 15m |
| 2026-05-29 | CLX7545 | KUL → DWC | May 29, 18:15 UTC | May 29, 18:25 UTC | 10m |
| 2026-05-29 | CLX7545 | KUL → DWC | May 29, 15:25 UTC | May 29, 16:00 UTC | 35m |
| 2026-05-28 | CLX9H | - | May 28, 21:00 UTC | May 29, 12:25 UTC | 15h 25m |
| 2026-05-27 | CLX32 | - | May 27, 18:10 UTC | May 28, 09:30 UTC | 15h 20m |
| 2026-05-27 | CLX32 | - | May 27, 11:30 UTC | May 28, 09:30 UTC | 22h 0m |
| 2026-05-27 | CLX9872 | LUX → PVG | May 27, 03:34 UTC | May 27, 18:30 UTC | 14h 55m |
| 2026-05-26 | CLX9872 | LUX → PVG | May 26, 21:04 UTC | May 27, 00:55 UTC | 3h 50m |
| 2026-05-26 | CLX6697 | PIK → LUX | May 26, 03:00 UTC | May 26, 04:54 UTC | 1h 55m |
| 2026-05-25 | CLX6697 | PIK → LUX | May 25, 15:05 UTC | May 25, 23:35 UTC | 8h 29m |
| 2026-05-24 | CLX6687 | MEX → GDL | May 24, 08:55 UTC | May 24, 20:10 UTC | 11h 15m |
| 2026-05-23 | CLX14W | LAX → LUX | May 23, 06:10 UTC | May 23, 16:35 UTC | 10h 25m |
| 2026-05-22 | CLX9 | - | May 22, 16:25 UTC | May 23, 03:25 UTC | 11h 0m |
| 2026-05-21 | CLX97C | IAH → PIK | May 21, 14:50 UTC | May 21, 16:10 UTC | 1h 20m |
| 2026-05-21 | CLX97C | IAH → PIK | May 21, 05:30 UTC | May 21, 13:15 UTC | 7h 45m |
| 2026-05-21 | CLX7 | - | May 21, 01:25 UTC | May 21, 02:05 UTC | 40m |
| 2026-05-20 | CLX7 | - | May 20, 13:05 UTC | May 20, 23:30 UTC | 10h 25m |
| 2026-05-20 | ICV87 | MXP → LUX | May 20, 03:15 UTC | May 20, 04:10 UTC | 55m |
| 2026-05-19 | ICV736 | - | May 19, 19:10 UTC | May 19, 23:10 UTC | 4h 0m |
| 2026-05-19 | ICV736 | - | May 19, 07:40 UTC | May 19, 08:00 UTC | 20m |
| 2026-05-18 | ICV9261 | DWC → MXP | May 18, 17:20 UTC | May 19, 04:30 UTC | 11h 9m |
| 2026-05-18 | ICV67 | LUX → MXP | May 18, 14:15 UTC | May 18, 15:05 UTC | 50m |
| 2026-05-17 | CLX56 | - | May 17, 11:30 UTC | May 17, 15:50 UTC | 4h 20m |
| 2026-05-16 | CLX9726 | LUX → CGO | May 16, 04:30 UTC | May 16, 06:55 UTC | 2h 26m |
| 2026-05-15 | CLX42 | - | May 15, 06:40 UTC | May 15, 11:05 UTC | 4h 25m |
| 2026-05-13 | CLX9723 | LUX → CGO | May 13, 05:20 UTC | May 13, 09:10 UTC | 3h 50m |
| 2026-05-11 | CLX57R | IAH → PIK | May 11, 15:50 UTC | May 11, 17:10 UTC | 1h 21m |
| 2026-05-11 | CLX57R | IAH → PIK | May 11, 06:15 UTC | May 11, 13:55 UTC | 7h 40m |
| 2026-05-10 | CLX8 | - | May 10, 12:25 UTC | May 10, 22:49 UTC | 10h 25m |
| 2026-05-09 | CLX57 | - | May 9, 10:55 UTC | May 10, 04:55 UTC | 18h 0m |
| 2026-05-09 | CLX58 | - | May 9, 00:40 UTC | May 9, 18:50 UTC | 18h 10m |
| 2026-05-08 | CLX58 | - | May 8, 22:20 UTC | May 9, 18:50 UTC | 20h 30m |
| 2026-05-08 | CLX58 | - | May 8, 21:10 UTC | May 9, 18:50 UTC | 21h 40m |
| 2026-05-08 | CLX75V | SJU → LUX | May 8, 08:40 UTC | May 8, 16:30 UTC | 7h 50m |
| 2026-05-08 | CLX8 | - | May 8, 04:14 UTC | May 8, 05:49 UTC | 1h 35m |
| 2026-05-08 | CLX8 | - | May 8, 02:35 UTC | May 8, 02:49 UTC | 15m |
| 2026-05-07 | CLX8 | - | May 7, 23:55 UTC | May 8, 00:14 UTC | 20m |
| 2026-05-07 | CLX8 | - | May 7, 15:45 UTC | May 7, 17:05 UTC | 1h 20m |
| 2026-05-03 | CLX56 | - | May 3, 03:10 UTC | May 3, 07:25 UTC | 4h 14m |
| 2026-05-02 | CLX56 | - | May 2, 06:20 UTC | May 3, 06:15 UTC | 23h 54m |
| 2026-05-02 | CLX9726 | LUX → CGO | May 2, 04:25 UTC | May 3, 04:15 UTC | 23h 49m |
| 2026-05-01 | CLX23K | IAH → LUX | May 1, 13:10 UTC | May 1, 22:00 UTC | 8h 50m |
| 2026-05-01 | CLX6694 | GDL → LUX | May 1, 09:30 UTC | May 1, 10:40 UTC | 1h 10m |
| 2026-05-01 | CLX6694 | GDL → LUX | May 1, 06:05 UTC | May 1, 06:15 UTC | 10m |
| 2026-04-30 | CLX6684 | MEX → GDL | Apr 30, 15:30 UTC | May 1, 02:40 UTC | 11h 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 LX-TCV page for operator, model, and routing details .