sensors Mode-S transponder
4D012F
ICAO 24-bit transponder address · allocated to Luxembourg
Currently assigned to LX-MCL · BOEING 747-400
- Hex
- 4D012F
- Octal
- 23200457
- Decimal
- 5,046,575
- Country
- LU
- Tail
- LX-MCL
- Type
- B744
- Flights observed
- 200
- Distinct callsigns
- 20
- Country
- LU
- Last broadcast
- 9h ago
Last known position
Country allocation
The ICAO 24-bit address 4D012F 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 |
|---|---|---|---|
| CLX22 | - | 10 | 2026-07-03 |
| CLX6225 | Cargolux | 8 | 2026-05-15 |
| CLX6827 | Cargolux | 7 | 2026-05-24 |
| CLX6821 | Cargolux | 7 | 2026-05-25 |
| CLX4 | - | 7 | 2026-07-05 |
| CLX91W | Cargolux | 6 | 2026-05-14 |
| CLX81T | Cargolux | 6 | 2026-05-17 |
| CLX6 | - | 6 | 2026-06-07 |
| CLX515 | - | 6 | 2026-07-01 |
| CLX9724 | - | 5 | 2026-07-02 |
| CLX9725 | Cargolux | 4 | 2026-06-19 |
| CLX87C | - | 4 | 2026-07-05 |
| CLX79 | - | 4 | 2026-06-20 |
| CLX78Y | Cargolux | 4 | 2026-05-30 |
| CLX7332 | Cargolux | 4 | 2026-06-24 |
| CLX67 | - | 4 | 2026-06-30 |
| CLX56 | - | 4 | 2026-04-15 |
| CLX5 | - | 4 | 2026-07-10 |
| CLX3 | - | 4 | 2026-06-18 |
| CLX9932 | - | 3 | 2026-07-01 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | CLX9722 | - | Jul 14, 05:00 UTC | Jul 14, 07:25 UTC | 2h 25m |
| 2026-07-13 | CLX48 | - | Jul 13, 17:45 UTC | Jul 13, 22:15 UTC | 4h 30m |
| 2026-07-13 | CLX48 | - | Jul 13, 03:25 UTC | Jul 13, 22:15 UTC | 18h 50m |
| 2026-07-12 | CLX9876 | - | Jul 12, 18:40 UTC | Jul 13, 17:45 UTC | 23h 5m |
| 2026-07-12 | CLX32 | - | Jul 12, 07:50 UTC | Jul 13, 03:40 UTC | 19h 50m |
| 2026-07-12 | CLX32 | - | Jul 12, 07:15 UTC | Jul 13, 03:40 UTC | 20h 25m |
| 2026-07-11 | CLX6746 | - | Jul 11, 17:50 UTC | Jul 12, 04:15 UTC | 10h 25m |
| 2026-07-10 | CLX21C | - | Jul 10, 20:50 UTC | Jul 11, 10:15 UTC | 13h 25m |
| 2026-07-10 | CLX21C | LUX → IAH | Jul 10, 17:20 UTC | Jul 10, 17:45 UTC | 25m |
| 2026-07-10 | CLX96Z | - | Jul 10, 05:05 UTC | Jul 10, 14:00 UTC | 8h 55m |
| 2026-07-10 | CLX5 | - | Jul 10, 00:25 UTC | Jul 10, 02:10 UTC | 1h 45m |
| 2026-07-09 | CLX5 | - | Jul 9, 14:00 UTC | Jul 9, 22:30 UTC | 8h 30m |
| 2026-07-09 | CLX65 | - | Jul 9, 06:25 UTC | Jul 9, 10:50 UTC | 4h 25m |
| 2026-07-08 | CLX65 | - | Jul 8, 10:20 UTC | Jul 9, 09:45 UTC | 23h 25m |
| 2026-07-08 | CLX7603 | - | Jul 8, 07:50 UTC | Jul 9, 07:45 UTC | 23h 55m |
| 2026-07-08 | CLX7603 | - | Jul 8, 07:05 UTC | Jul 8, 10:50 UTC | 3h 45m |
| 2026-07-07 | CLX38J | - | Jul 7, 20:35 UTC | Jul 8, 04:10 UTC | 7h 35m |
| 2026-07-07 | CLX38J | ANC → ORD | Jul 7, 10:15 UTC | Jul 7, 15:35 UTC | 5h 20m |
| 2026-07-07 | CLX5721 | - | Jul 7, 01:20 UTC | Jul 7, 08:40 UTC | 7h 20m |
| 2026-07-06 | CLX5721 | - | Jul 6, 22:30 UTC | Jul 6, 22:40 UTC | 10m |
| 2026-07-06 | CLX4731 | - | Jul 6, 08:40 UTC | Jul 6, 19:00 UTC | 10h 20m |
| 2026-07-05 | CLX87C | ATL → LUX | Jul 5, 22:35 UTC | Jul 6, 06:15 UTC | 7h 40m |
| 2026-07-05 | CLX4 | - | Jul 5, 18:10 UTC | Jul 5, 19:15 UTC | 1h 5m |
| 2026-07-05 | CLX4 | - | Jul 5, 07:10 UTC | Jul 5, 15:35 UTC | 8h 25m |
| 2026-07-04 | CLX9936 | HKG → LUX | Jul 4, 13:35 UTC | Jul 5, 04:20 UTC | 14h 45m |
| 2026-07-03 | CLX9935 | - | Jul 3, 21:00 UTC | Jul 4, 10:45 UTC | 13h 45m |
| 2026-07-03 | CLX22 | - | Jul 3, 15:55 UTC | Jul 3, 16:40 UTC | 45m |
| 2026-07-03 | CLX22 | - | Jul 3, 09:15 UTC | Jul 3, 14:25 UTC | 5h 10m |
| 2026-07-02 | CLX9724 | - | Jul 2, 07:25 UTC | Jul 2, 09:50 UTC | 2h 25m |
| 2026-07-01 | CLX515 | BUD → LUX | Jul 1, 19:05 UTC | Jul 1, 20:25 UTC | 1h 20m |
| 2026-07-01 | CLX515 | - | Jul 1, 13:40 UTC | Jul 1, 14:55 UTC | 1h 15m |
| 2026-07-01 | CLX515 | - | Jul 1, 04:00 UTC | Jul 1, 04:20 UTC | 20m |
| 2026-07-01 | CLX9932 | - | Jul 1, 00:20 UTC | Jul 1, 00:45 UTC | 25m |
| 2026-06-30 | CLX9932 | DWC → LUX | Jun 30, 13:45 UTC | Jun 30, 17:35 UTC | 3h 50m |
| 2026-06-30 | CLX67 | MXP → LUX | Jun 30, 04:20 UTC | Jun 30, 05:10 UTC | 50m |
| 2026-06-29 | CLX67 | - | Jun 29, 13:44 UTC | Jun 30, 00:14 UTC | 10h 30m |
| 2026-06-28 | CLX5 | - | Jun 28, 15:40 UTC | Jun 29, 02:00 UTC | 10h 20m |
| 2026-06-28 | CLX87C | ATL → LUX | Jun 28, 04:10 UTC | Jun 28, 11:50 UTC | 7h 40m |
| 2026-06-28 | CLX4 | - | Jun 28, 00:09 UTC | Jun 28, 01:15 UTC | 1h 5m |
| 2026-06-27 | CLX4 | - | Jun 27, 13:04 UTC | Jun 27, 21:19 UTC | 8h 15m |
| 2026-06-26 | CLX17 | - | Jun 26, 10:39 UTC | Jun 27, 08:05 UTC | 21h 25m |
| 2026-06-25 | CLX9874 | - | Jun 25, 23:49 UTC | Jun 26, 19:14 UTC | 19h 25m |
| 2026-06-25 | CLX43 | - | Jun 25, 21:50 UTC | Jun 26, 19:14 UTC | 21h 25m |
| 2026-06-25 | CLX43 | - | Jun 25, 21:20 UTC | Jun 26, 19:14 UTC | 21h 55m |
| 2026-06-25 | CLX531 | - | Jun 25, 09:20 UTC | Jun 25, 10:39 UTC | 1h 20m |
| 2026-06-24 | CV3119 | - | Jun 24, 23:40 UTC | Jun 24, 23:59 UTC | 20m |
| 2026-06-24 | CLX7332 | LUX → HKG | Jun 24, 21:00 UTC | Jun 24, 21:14 UTC | 15m |
| 2026-06-24 | CLX7332 | LUX → HKG | Jun 24, 18:44 UTC | Jun 24, 19:10 UTC | 25m |
| 2026-06-23 | CLX7332 | LUX → HKG | Jun 23, 21:29 UTC | Jun 23, 23:59 UTC | 2h 30m |
| 2026-06-23 | CLX6232 | SCL → MIA | Jun 23, 01:35 UTC | Jun 23, 12:45 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-MCL page for operator, model, and routing details .