sensors Mode-S transponder
4D012B
ICAO 24-bit transponder address · allocated to Luxembourg
Currently assigned to LX-GCL · BOEING 747-400
- Hex
- 4D012B
- Octal
- 23200453
- Decimal
- 5,046,571
- Country
- LU
- Tail
- LX-GCL
- Type
- B744
- Flights observed
- 192
- Distinct callsigns
- 20
- Country
- LU
- Last broadcast
- Jul 26, 12:30 UTC
Last known position
Country allocation
The ICAO 24-bit address 4D012B 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 |
|---|---|---|---|
| CLX58 | - | 10 | 2026-07-03 |
| CLX9872 | - | 9 | 2026-07-22 |
| CLX49 | - | 8 | 2026-06-10 |
| CLX7602 | Cargolux | 7 | 2026-06-09 |
| CLX708 | - | 7 | 2026-06-29 |
| CLX32 | - | 7 | 2026-07-19 |
| CLX2 | - | 7 | 2026-06-20 |
| CLX6 | - | 6 | 2026-05-24 |
| CLX57 | - | 6 | 2026-07-05 |
| CLX7355 | Cargolux | 5 | 2026-07-26 |
| CLX57R | Cargolux | 5 | 2026-04-13 |
| CLX79 | - | 4 | 2026-07-13 |
| CLX7855 | - | 4 | 2026-06-27 |
| CLX6697 | Cargolux | 4 | 2026-05-31 |
| CLX65 | - | 4 | 2026-07-12 |
| CLX34E | Cargolux | 4 | 2026-04-16 |
| CLX18W | Cargolux | 4 | 2026-04-17 |
| CLX74A | Cargolux | 3 | 2026-06-21 |
| CLX7332 | Cargolux | 3 | 2026-06-17 |
| CLX72W | Cargolux | 3 | 2026-05-25 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | CLX597 | GYD → LUX | Jul 26, 12:10 UTC | Jul 26, 12:30 UTC | 20m |
| 2026-07-26 | CLX7355 | NRT → HKG | Jul 26, 06:40 UTC | Jul 26, 06:50 UTC | 10m |
| 2026-07-26 | CLX7355 | NRT → HKG | Jul 26, 04:05 UTC | Jul 26, 04:30 UTC | 25m |
| 2026-07-24 | CLX7355 | NRT → HKG | Jul 24, 21:55 UTC | Jul 25, 08:35 UTC | 10h 40m |
| 2026-07-24 | CLX9873 | PVG → LUX | Jul 24, 05:20 UTC | Jul 24, 15:55 UTC | 10h 35m |
| 2026-07-22 | CLX9872 | LUX → PVG | Jul 22, 17:10 UTC | Jul 23, 01:30 UTC | 8h 20m |
| 2026-07-22 | CLX9872 | - | Jul 22, 11:10 UTC | Jul 22, 12:50 UTC | 1h 40m |
| 2026-07-20 | CLX48 | - | Jul 20, 06:25 UTC | Jul 20, 21:20 UTC | 14h 55m |
| 2026-07-19 | CLX48 | - | Jul 19, 19:20 UTC | Jul 20, 18:25 UTC | 23h 5m |
| 2026-07-19 | CLX32 | - | Jul 19, 10:55 UTC | Jul 20, 06:45 UTC | 19h 50m |
| 2026-07-19 | CLX32 | - | Jul 19, 08:50 UTC | Jul 20, 06:45 UTC | 21h 55m |
| 2026-07-19 | CLX32 | - | Jul 19, 07:45 UTC | Jul 20, 06:45 UTC | 23h 0m |
| 2026-07-18 | CLX309 | - | Jul 18, 23:45 UTC | Jul 19, 04:05 UTC | 4h 20m |
| 2026-07-18 | CLX309 | - | Jul 18, 10:40 UTC | Jul 18, 10:55 UTC | 15m |
| 2026-07-18 | CLX9935 | DMM → HKG | Jul 18, 07:30 UTC | Jul 18, 08:10 UTC | 40m |
| 2026-07-17 | CLX9935 | - | Jul 17, 20:55 UTC | Jul 18, 00:39 UTC | 3h 45m |
| 2026-07-16 | CLX56R | - | Jul 16, 19:14 UTC | Jul 17, 05:20 UTC | 10h 5m |
| 2026-07-16 | CLX5164 | - | Jul 16, 08:05 UTC | Jul 16, 13:54 UTC | 5h 50m |
| 2026-07-15 | CLX5163 | - | Jul 15, 23:10 UTC | Jul 16, 05:15 UTC | 6h 5m |
| 2026-07-15 | CLX245 | HKG → ANC | Jul 15, 12:00 UTC | Jul 15, 21:50 UTC | 9h 50m |
| 2026-07-14 | CLX1632 | LUX → HKG | Jul 14, 21:45 UTC | Jul 15, 09:00 UTC | 11h 14m |
| 2026-07-13 | CLX79 | - | Jul 13, 18:20 UTC | Jul 14, 07:30 UTC | 13h 10m |
| 2026-07-13 | CLX79 | - | Jul 13, 11:15 UTC | Jul 14, 07:30 UTC | 20h 15m |
| 2026-07-12 | CLX65 | - | Jul 12, 22:50 UTC | Jul 13, 18:35 UTC | 19h 45m |
| 2026-07-12 | CLX65 | - | Jul 12, 21:15 UTC | Jul 13, 18:35 UTC | 21h 20m |
| 2026-07-12 | CLX56 | - | Jul 12, 08:55 UTC | Jul 12, 13:25 UTC | 4h 30m |
| 2026-07-11 | CLX56 | - | Jul 11, 12:50 UTC | Jul 12, 12:45 UTC | 23h 55m |
| 2026-07-11 | CLX9726 | - | Jul 11, 10:55 UTC | Jul 12, 10:15 UTC | 23h 20m |
| 2026-07-10 | CLX17 | - | Jul 10, 10:15 UTC | Jul 11, 04:30 UTC | 18h 16m |
| 2026-07-09 | CLX43 | - | Jul 9, 22:50 UTC | Jul 10, 18:25 UTC | 19h 35m |
| 2026-07-09 | CLX43 | - | Jul 9, 20:55 UTC | Jul 10, 18:25 UTC | 21h 30m |
| 2026-07-09 | CLX42 | - | Jul 9, 11:45 UTC | Jul 9, 16:10 UTC | 4h 25m |
| 2026-07-08 | CLX42 | - | Jul 8, 17:10 UTC | Jul 9, 16:10 UTC | 23h 0m |
| 2026-07-08 | CLX9723 | - | Jul 8, 14:50 UTC | Jul 9, 14:45 UTC | 23h 55m |
| 2026-07-08 | CLX9723 | - | Jul 8, 13:45 UTC | Jul 9, 12:45 UTC | 23h 0m |
| 2026-07-06 | CLX7957 | HKG → GYD | Jul 6, 15:35 UTC | Jul 7, 04:05 UTC | 12h 30m |
| 2026-07-06 | CLX7957 | HKG → GYD | Jul 6, 10:25 UTC | Jul 6, 10:40 UTC | 15m |
| 2026-07-06 | CLX7956 | - | Jul 6, 06:00 UTC | Jul 6, 06:30 UTC | 30m |
| 2026-07-06 | CLX7956 | - | Jul 6, 05:00 UTC | Jul 6, 05:15 UTC | 15m |
| 2026-07-05 | CLX8S | - | Jul 5, 11:10 UTC | Jul 5, 23:25 UTC | 12h 15m |
| 2026-07-05 | CLX57 | - | Jul 5, 03:35 UTC | Jul 5, 08:05 UTC | 4h 30m |
| 2026-07-04 | CLX57 | - | Jul 4, 11:00 UTC | Jul 5, 08:05 UTC | 21h 5m |
| 2026-07-03 | CLX58 | - | Jul 3, 21:35 UTC | Jul 4, 11:20 UTC | 13h 45m |
| 2026-07-02 | CLX65 | - | Jul 2, 07:55 UTC | Jul 2, 12:15 UTC | 4h 20m |
| 2026-07-01 | CLX65 | - | Jul 1, 10:50 UTC | Jul 2, 10:45 UTC | 23h 55m |
| 2026-07-01 | CLX7603 | - | Jul 1, 08:50 UTC | Jul 2, 08:45 UTC | 23h 55m |
| 2026-07-01 | CLX7603 | - | Jul 1, 06:55 UTC | Jul 1, 11:00 UTC | 4h 5m |
| 2026-06-29 | CLX708 | BUD → LUX | Jun 29, 18:25 UTC | Jun 29, 19:49 UTC | 1h 25m |
| 2026-06-29 | CLX708 | - | Jun 29, 11:45 UTC | Jun 29, 14:50 UTC | 3h 5m |
| 2026-06-29 | CLX708 | - | Jun 29, 01:39 UTC | Jun 29, 02:00 UTC | 20m |
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-GCL page for operator, model, and routing details .