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
- 197
- Distinct callsigns
- 20
- Country
- LU
- Last broadcast
- Jul 26, 16:35 UTC
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 |
|---|---|---|---|
| CLX81T | Cargolux | 8 | 2026-07-26 |
| CLX91W | Cargolux | 7 | 2026-06-10 |
| CLX7 | - | 7 | 2026-07-16 |
| CLX56 | - | 6 | 2026-07-05 |
| CLX69B | Cargolux | 5 | 2026-05-04 |
| CLX54 | - | 5 | 2026-07-06 |
| CLX22 | Cargolux | 5 | 2026-06-19 |
| CLX97C | - | 4 | 2026-07-16 |
| CLX85 | - | 4 | 2026-07-07 |
| CLX6827 | - | 4 | 2026-06-29 |
| CLX6236 | Cargolux | 4 | 2026-07-25 |
| CLX6225 | Cargolux | 4 | 2026-07-24 |
| CLX515 | - | 4 | 2026-04-15 |
| CLX43 | - | 4 | 2026-05-29 |
| CLX9932 | - | 3 | 2026-04-14 |
| CLX9726 | - | 3 | 2026-07-04 |
| CLX9724 | Cargolux | 3 | 2026-06-18 |
| CLX708 | - | 3 | 2026-07-12 |
| CLX5952 | Cargolux | 3 | 2026-06-09 |
| CLX4951 | - | 3 | 2026-06-08 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | ICV1069 | - | Jul 26, 14:10 UTC | Jul 26, 16:35 UTC | 2h 25m |
| 2026-07-26 | CLX81T | MIA → AMS | Jul 26, 11:00 UTC | Jul 26, 11:35 UTC | 35m |
| 2026-07-26 | CLX81T | MIA → AMS | Jul 26, 00:50 UTC | Jul 26, 08:45 UTC | 7h 56m |
| 2026-07-25 | CLX6236 | UIO → MIA | Jul 25, 10:30 UTC | Jul 25, 22:10 UTC | 11h 40m |
| 2026-07-24 | CLX6225 | VCP → CWB | Jul 24, 20:05 UTC | Jul 25, 07:10 UTC | 11h 5m |
| 2026-07-23 | CLX38D | ANC → ORD | Jul 23, 00:15 UTC | Jul 23, 07:35 UTC | 7h 20m |
| 2026-07-22 | CLX48A | - | Jul 22, 13:25 UTC | Jul 22, 21:15 UTC | 7h 50m |
| 2026-07-22 | CLX18M | PIT → LGG | Jul 22, 00:35 UTC | Jul 22, 02:20 UTC | 1h 45m |
| 2026-07-21 | CLX34C | - | Jul 21, 13:55 UTC | Jul 21, 21:40 UTC | 7h 45m |
| 2026-07-21 | CLX81A | ANC → ORD | Jul 21, 01:10 UTC | Jul 21, 08:45 UTC | 7h 35m |
| 2026-07-20 | CLX81A | ANC → ORD | Jul 20, 16:55 UTC | Jul 20, 22:20 UTC | 5h 25m |
| 2026-07-20 | CLX5901 | BKK → ANC | Jul 20, 06:05 UTC | Jul 20, 15:05 UTC | 9h 0m |
| 2026-07-20 | CLX5901 | BKK → ANC | Jul 20, 04:00 UTC | Jul 20, 04:15 UTC | 15m |
| 2026-07-19 | CLX4907 | - | Jul 19, 14:40 UTC | Jul 20, 01:15 UTC | 10h 35m |
| 2026-07-19 | CLX98V | DFW → LUX | Jul 19, 05:10 UTC | Jul 19, 11:35 UTC | 6h 25m |
| 2026-07-19 | CLX98V | DFW → LUX | Jul 19, 02:35 UTC | Jul 19, 05:05 UTC | 2h 30m |
| 2026-07-18 | CLX78Y | LUX → ORD | Jul 18, 22:20 UTC | Jul 19, 00:10 UTC | 1h 50m |
| 2026-07-18 | CLX78Y | LUX → ORD | Jul 18, 11:15 UTC | Jul 18, 19:35 UTC | 8h 20m |
| 2026-07-18 | CLX79 | - | Jul 18, 03:10 UTC | Jul 18, 07:35 UTC | 4h 25m |
| 2026-07-17 | CLX79 | - | Jul 17, 07:20 UTC | Jul 18, 07:15 UTC | 23h 56m |
| 2026-07-17 | CLX9725 | LUX → CGO | Jul 17, 05:20 UTC | Jul 18, 04:25 UTC | 23h 6m |
| 2026-07-17 | CLX9725 | LUX → CGO | Jul 17, 04:54 UTC | Jul 18, 03:15 UTC | 22h 21m |
| 2026-07-16 | CLX97C | - | Jul 16, 15:19 UTC | Jul 16, 16:44 UTC | 1h 25m |
| 2026-07-16 | CLX97C | - | Jul 16, 05:10 UTC | Jul 16, 13:45 UTC | 8h 35m |
| 2026-07-16 | CLX7 | - | Jul 16, 01:20 UTC | Jul 16, 02:00 UTC | 40m |
| 2026-07-15 | CLX7 | - | Jul 15, 13:10 UTC | Jul 15, 23:00 UTC | 9h 50m |
| 2026-07-14 | CLX38J | - | Jul 14, 21:55 UTC | Jul 15, 08:20 UTC | 10h 24m |
| 2026-07-14 | CLX38J | - | Jul 14, 14:30 UTC | Jul 14, 19:10 UTC | 4h 40m |
| 2026-07-14 | CLX5722 | - | Jul 14, 05:35 UTC | Jul 14, 13:00 UTC | 7h 25m |
| 2026-07-13 | CLX4731 | - | Jul 13, 12:35 UTC | Jul 13, 23:00 UTC | 10h 25m |
| 2026-07-12 | CLX708 | BUD → LUX | Jul 12, 14:45 UTC | Jul 12, 16:10 UTC | 1h 25m |
| 2026-07-12 | CLX708 | - | Jul 12, 10:15 UTC | Jul 12, 13:30 UTC | 3h 15m |
| 2026-07-12 | CLX708 | - | Jul 12, 00:50 UTC | Jul 12, 01:10 UTC | 20m |
| 2026-07-11 | CLX7855 | - | Jul 11, 21:10 UTC | Jul 11, 21:25 UTC | 15m |
| 2026-07-11 | CLX7855 | - | Jul 11, 04:30 UTC | Jul 11, 14:55 UTC | 10h 25m |
| 2026-07-10 | CLX56R | - | Jul 10, 09:10 UTC | Jul 10, 19:30 UTC | 10h 20m |
| 2026-07-09 | CLX5164 | - | Jul 9, 23:40 UTC | Jul 10, 05:25 UTC | 5h 45m |
| 2026-07-09 | CLX5163 | - | Jul 9, 14:40 UTC | Jul 9, 20:35 UTC | 5h 55m |
| 2026-07-09 | CLX245 | HKG → ANC | Jul 9, 03:10 UTC | Jul 9, 13:05 UTC | 9h 55m |
| 2026-07-08 | CLX4162 | - | Jul 8, 13:20 UTC | Jul 9, 00:20 UTC | 11h 0m |
| 2026-07-07 | CLX85 | - | Jul 7, 21:05 UTC | Jul 8, 10:20 UTC | 13h 15m |
| 2026-07-07 | CLX85 | - | Jul 7, 10:50 UTC | Jul 8, 09:15 UTC | 22h 25m |
| 2026-07-06 | CLX54 | - | Jul 6, 23:20 UTC | Jul 7, 21:25 UTC | 22h 5m |
| 2026-07-06 | CLX54 | - | Jul 6, 21:25 UTC | Jul 7, 21:15 UTC | 23h 50m |
| 2026-07-06 | CLX6697 | - | Jul 6, 00:25 UTC | Jul 6, 13:45 UTC | 13h 20m |
| 2026-07-05 | CLX6687 | - | Jul 5, 09:40 UTC | Jul 5, 20:50 UTC | 11h 10m |
| 2026-07-05 | CLX56 | - | Jul 5, 02:05 UTC | Jul 5, 06:35 UTC | 4h 30m |
| 2026-07-04 | CLX56 | - | Jul 4, 05:20 UTC | Jul 5, 03:25 UTC | 22h 5m |
| 2026-07-04 | CLX9726 | - | Jul 4, 04:10 UTC | Jul 5, 03:15 UTC | 23h 5m |
| 2026-07-03 | CLX23K | - | Jul 3, 10:30 UTC | Jul 3, 19:25 UTC | 8h 55m |
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 .