sensors Mode-S transponder
4D012D
ICAO 24-bit transponder address · allocated to Luxembourg
Currently assigned to LX-KCL · BOEING 747-400
- Hex
- 4D012D
- Octal
- 23200455
- Decimal
- 5,046,573
- Country
- LU
- Tail
- LX-KCL
- Type
- B744
- Flights observed
- 86
- Distinct callsigns
- 20
- Country
- LU
- Last broadcast
- 6h ago
Last known position
Country allocation
The ICAO 24-bit address 4D012D 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 |
|---|---|---|---|
| CLX7 | - | 5 | 2026-05-28 |
| CLX69B | Cargolux | 5 | 2026-05-04 |
| CLX91W | Cargolux | 4 | 2026-05-27 |
| CLX81T | Cargolux | 4 | 2026-05-03 |
| CLX56 | - | 4 | 2026-04-22 |
| CLX515 | - | 4 | 2026-04-15 |
| CLX43 | - | 4 | 2026-05-29 |
| CLX9932 | - | 3 | 2026-04-14 |
| CLX31 | - | 3 | 2026-05-23 |
| CLX97C | Cargolux | 2 | 2026-05-28 |
| CLX9726 | Cargolux | 2 | 2026-04-18 |
| CLX9722 | Cargolux | 2 | 2026-04-21 |
| CLX86N | Cargolux | 2 | 2026-05-14 |
| CLX82 | - | 2 | 2026-05-01 |
| CLX7751 | Cargolux | 2 | 2026-04-28 |
| CLX6822 | Cargolux | 2 | 2026-05-13 |
| CLX67 | Cargolux | 2 | 2026-04-27 |
| CLX6236 | Cargolux | 2 | 2026-05-02 |
| CLX6232 | Cargolux | 2 | 2026-05-11 |
| CLX6225 | Cargolux | 2 | 2026-05-01 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | CLX43 | - | May 29, 00:05 UTC | May 29, 19:05 UTC | 19h 0m |
| 2026-05-28 | CLX43 | - | May 28, 21:20 UTC | May 29, 19:05 UTC | 21h 45m |
| 2026-05-28 | CLX43 | - | May 28, 20:50 UTC | May 29, 19:05 UTC | 22h 15m |
| 2026-05-28 | CLX97C | IAH → PIK | May 28, 15:50 UTC | May 28, 17:10 UTC | 1h 20m |
| 2026-05-28 | CLX97C | IAH → PIK | May 28, 05:50 UTC | May 28, 14:10 UTC | 8h 20m |
| 2026-05-28 | CLX7 | - | May 28, 01:45 UTC | May 28, 02:25 UTC | 40m |
| 2026-05-27 | CLX7 | LUX → DFW | May 27, 13:35 UTC | May 27, 23:20 UTC | 9h 45m |
| 2026-05-27 | CLX91W | ANC → ORD | May 27, 01:34 UTC | May 27, 09:20 UTC | 7h 45m |
| 2026-05-26 | CLX91W | ANC → ORD | May 26, 17:25 UTC | May 26, 22:50 UTC | 5h 25m |
| 2026-05-26 | CLX5952 | NLU → LUX | May 26, 01:34 UTC | May 26, 13:10 UTC | 11h 35m |
| 2026-05-25 | CLX4951 | - | May 25, 11:00 UTC | May 25, 21:45 UTC | 10h 44m |
| 2026-05-25 | CLX48 | - | May 25, 03:50 UTC | May 25, 08:00 UTC | 4h 10m |
| 2026-05-23 | CLX32 | - | May 23, 21:20 UTC | May 24, 01:20 UTC | 4h 0m |
| 2026-05-23 | CLX31 | - | May 23, 08:40 UTC | May 23, 12:55 UTC | 4h 15m |
| 2026-05-22 | CLX31 | - | May 22, 13:20 UTC | May 23, 12:55 UTC | 23h 34m |
| 2026-05-22 | CLX31 | - | May 22, 11:20 UTC | May 23, 11:15 UTC | 23h 55m |
| 2026-05-22 | CLX7605 | LUX → VCP | May 22, 09:20 UTC | May 23, 09:15 UTC | 23h 54m |
| 2026-05-20 | CLX91W | ANC → ORD | May 20, 00:25 UTC | May 20, 07:50 UTC | 7h 26m |
| 2026-05-19 | CLX91W | ANC → ORD | May 19, 15:05 UTC | May 19, 20:45 UTC | 5h 40m |
| 2026-05-19 | CLX5952 | NLU → LUX | May 19, 02:35 UTC | May 19, 13:40 UTC | 11h 5m |
| 2026-05-18 | CLX4951 | - | May 18, 10:55 UTC | May 18, 21:50 UTC | 10h 54m |
| 2026-05-17 | CLX93D | LAX → LUX | May 17, 08:50 UTC | May 17, 16:15 UTC | 7h 25m |
| 2026-05-17 | CLX6696 | DFW → LUX | May 17, 02:50 UTC | May 17, 06:00 UTC | 3h 10m |
| 2026-05-16 | CLX6686 | MEX → DFW | May 16, 12:55 UTC | May 17, 00:30 UTC | 11h 35m |
| 2026-05-16 | CLX17 | - | May 16, 03:50 UTC | May 16, 08:01 UTC | 4h 11m |
| 2026-05-14 | CLX43 | - | May 14, 20:45 UTC | May 15, 00:45 UTC | 4h 0m |
| 2026-05-14 | CLX86N | MIA → AMS | May 14, 13:35 UTC | May 14, 14:15 UTC | 40m |
| 2026-05-14 | CLX86N | MIA → AMS | May 14, 03:00 UTC | May 14, 11:10 UTC | 8h 10m |
| 2026-05-13 | CLX6823 | AMS → LUX | May 13, 14:25 UTC | May 14, 00:25 UTC | 10h 0m |
| 2026-05-13 | CLX6822 | CWB → UIO | May 13, 10:05 UTC | May 13, 10:40 UTC | 35m |
| 2026-05-12 | CLX6822 | CWB → UIO | May 12, 20:10 UTC | May 13, 07:45 UTC | 11h 35m |
| 2026-05-11 | CLX6232 | SCL → MIA | May 11, 20:10 UTC | May 12, 12:15 UTC | 16h 5m |
| 2026-05-11 | CLX6232 | SCL → MIA | May 11, 13:20 UTC | May 12, 12:15 UTC | 22h 56m |
| 2026-05-11 | CLX6221 | LUX → VCP | May 11, 12:00 UTC | May 12, 11:15 UTC | 23h 16m |
| 2026-05-10 | CLX309 | - | May 10, 11:55 UTC | May 10, 16:20 UTC | 4h 25m |
| 2026-05-10 | CLX309 | - | May 10, 02:04 UTC | May 10, 02:24 UTC | 20m |
| 2026-05-09 | CLX9935 | DMM → HKG | May 9, 11:50 UTC | May 9, 15:50 UTC | 4h 0m |
| 2026-05-06 | CLX49 | - | May 6, 12:35 UTC | May 6, 17:00 UTC | 4h 25m |
| 2026-05-05 | CLX7602 | LUX → CWB | May 5, 07:40 UTC | May 5, 11:40 UTC | 4h 0m |
| 2026-05-04 | CLX69B | ORD → LUX | May 4, 04:15 UTC | May 4, 12:05 UTC | 7h 50m |
| 2026-05-03 | CLX7 | - | May 3, 16:05 UTC | May 4, 00:25 UTC | 8h 20m |
| 2026-05-03 | CLX81T | MIA → AMS | May 3, 12:10 UTC | May 3, 12:45 UTC | 35m |
| 2026-05-03 | CLX81T | MIA → AMS | May 3, 01:25 UTC | May 3, 09:45 UTC | 8h 19m |
| 2026-05-02 | CLX6236 | UIO → MIA | May 2, 10:45 UTC | May 2, 21:55 UTC | 11h 10m |
| 2026-05-01 | CLX6225 | VCP → CWB | May 1, 20:35 UTC | May 2, 08:00 UTC | 11h 26m |
| 2026-05-01 | CLX82 | - | May 1, 05:45 UTC | May 1, 10:10 UTC | 4h 25m |
| 2026-04-30 | CLX82 | - | Apr 30, 07:55 UTC | May 1, 07:10 UTC | 23h 15m |
| 2026-04-30 | CLX7534 | - | Apr 30, 03:40 UTC | Apr 30, 09:00 UTC | 5h 20m |
| 2026-04-29 | CLX873 | - | Apr 29, 12:40 UTC | Apr 29, 14:50 UTC | 2h 10m |
| 2026-04-29 | CLX63 | - | Apr 29, 05:05 UTC | Apr 29, 09:45 UTC | 4h 41m |
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-KCL page for operator, model, and routing details .