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
- 90
- Distinct callsigns
- 20
- Country
- LU
- Last broadcast
- 1h ago
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 | - | 8 | 2026-05-29 |
| CLX6 | - | 6 | 2026-05-24 |
| CLX49 | - | 6 | 2026-05-27 |
| CLX7602 | Cargolux | 5 | 2026-05-26 |
| CLX57R | Cargolux | 5 | 2026-04-13 |
| CLX9872 | Cargolux | 4 | 2026-05-13 |
| CLX57 | - | 4 | 2026-05-02 |
| CLX34E | Cargolux | 4 | 2026-04-16 |
| CLX18W | Cargolux | 4 | 2026-04-17 |
| CLX72W | Cargolux | 3 | 2026-05-25 |
| CLX22 | Cargolux | 3 | 2026-05-01 |
| CLX2 | - | 3 | 2026-05-28 |
| CLX976 | - | 2 | 2026-04-23 |
| CLX9725 | Cargolux | 2 | 2026-04-24 |
| CLX9724 | Cargolux | 2 | 2026-04-30 |
| CLX79 | - | 2 | 2026-04-25 |
| CLX7623 | Cargolux | 2 | 2026-04-22 |
| CLX7591 | - | 2 | 2026-04-27 |
| CLX6697 | Cargolux | 2 | 2026-05-18 |
| CLX45 | - | 2 | 2026-04-28 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | CLX58 | - | May 29, 21:20 UTC | May 30, 00:45 UTC | 3h 25m |
| 2026-05-28 | CLX74T | IND → LUX | May 28, 04:40 UTC | May 28, 12:30 UTC | 7h 50m |
| 2026-05-28 | CLX2 | ORD → IND | May 28, 01:30 UTC | May 28, 02:05 UTC | 35m |
| 2026-05-27 | CLX2 | LUX → ORD | May 27, 14:30 UTC | May 27, 22:45 UTC | 8h 15m |
| 2026-05-27 | CLX49 | - | May 27, 06:49 UTC | May 27, 11:15 UTC | 4h 26m |
| 2026-05-26 | CLX49 | - | May 26, 10:50 UTC | May 27, 10:45 UTC | 23h 55m |
| 2026-05-26 | CLX7602 | LUX → CWB | May 26, 08:50 UTC | May 27, 08:05 UTC | 23h 16m |
| 2026-05-26 | CLX7602 | LUX → CWB | May 26, 08:34 UTC | May 26, 12:35 UTC | 4h 0m |
| 2026-05-25 | CLX72W | PIK → LUX | May 25, 06:05 UTC | May 25, 14:10 UTC | 8h 5m |
| 2026-05-24 | CLX6 | - | May 24, 23:00 UTC | May 24, 23:46 UTC | 46m |
| 2026-05-24 | CLX6 | - | May 24, 11:35 UTC | May 24, 20:55 UTC | 9h 20m |
| 2026-05-23 | CLX74A | JFK → LUX | May 23, 23:20 UTC | May 24, 06:00 UTC | 6h 40m |
| 2026-05-23 | CLX2 | LUX → JFK | May 23, 11:40 UTC | May 23, 19:25 UTC | 7h 45m |
| 2026-05-18 | CLX6697 | PIK → LUX | May 18, 03:25 UTC | May 18, 13:15 UTC | 9h 50m |
| 2026-05-17 | CLX6697 | PIK → LUX | May 17, 23:55 UTC | May 18, 00:10 UTC | 15m |
| 2026-05-17 | CLX6687 | MEX → GDL | May 17, 09:55 UTC | May 17, 21:15 UTC | 11h 20m |
| 2026-05-16 | CLX95U | HSV → LUX | May 16, 02:30 UTC | May 16, 09:56 UTC | 7h 26m |
| 2026-05-15 | CLX1 | - | May 15, 22:20 UTC | May 15, 23:00 UTC | 40m |
| 2026-05-15 | CLX1 | - | May 15, 11:30 UTC | May 15, 20:00 UTC | 8h 29m |
| 2026-05-14 | CLX32 | - | May 14, 03:15 UTC | May 14, 07:45 UTC | 4h 30m |
| 2026-05-13 | CLX9872 | LUX → PVG | May 13, 02:25 UTC | May 13, 02:55 UTC | 30m |
| 2026-05-12 | CLX9872 | LUX → PVG | May 12, 21:10 UTC | May 12, 23:20 UTC | 2h 10m |
| 2026-05-11 | CLX72W | PIK → LUX | May 11, 03:10 UTC | May 11, 11:05 UTC | 7h 55m |
| 2026-05-10 | CLX6 | - | May 10, 22:20 UTC | May 10, 23:44 UTC | 1h 25m |
| 2026-05-10 | CLX6 | - | May 10, 10:55 UTC | May 10, 20:09 UTC | 9h 15m |
| 2026-05-09 | CLX14W | LAX → LUX | May 9, 06:45 UTC | May 9, 17:00 UTC | 10h 15m |
| 2026-05-08 | CLX9 | - | May 8, 16:25 UTC | May 9, 03:30 UTC | 11h 5m |
| 2026-05-07 | CLX67D | JFK → LUX | May 7, 07:25 UTC | May 7, 14:05 UTC | 6h 40m |
| 2026-05-06 | CLX49Z | PIK → LAX | May 6, 20:30 UTC | May 7, 04:10 UTC | 7h 40m |
| 2026-05-04 | CLX72W | PIK → LUX | May 4, 03:45 UTC | May 4, 12:00 UTC | 8h 15m |
| 2026-05-03 | CLX6 | - | May 3, 22:54 UTC | May 4, 00:19 UTC | 1h 25m |
| 2026-05-03 | CLX6 | - | May 3, 10:20 UTC | May 3, 20:10 UTC | 9h 50m |
| 2026-05-02 | CLX57 | - | May 2, 19:00 UTC | May 3, 07:35 UTC | 12h 34m |
| 2026-05-02 | CLX57 | - | May 2, 11:40 UTC | May 3, 07:35 UTC | 19h 54m |
| 2026-05-02 | CLX58 | - | May 2, 00:50 UTC | May 2, 19:20 UTC | 18h 31m |
| 2026-05-01 | CLX58 | - | May 1, 22:50 UTC | May 2, 19:20 UTC | 20h 30m |
| 2026-05-01 | CLX58 | - | May 1, 21:15 UTC | May 2, 19:20 UTC | 22h 6m |
| 2026-05-01 | CLX22 | STN → LUX | May 1, 17:25 UTC | May 1, 18:15 UTC | 50m |
| 2026-05-01 | CLX22 | STN → LUX | May 1, 10:50 UTC | May 1, 12:05 UTC | 1h 15m |
| 2026-04-30 | CLX22 | STN → LUX | Apr 30, 15:10 UTC | May 1, 12:05 UTC | 20h 55m |
| 2026-04-30 | CLX9724 | LUX → CGO | Apr 30, 12:50 UTC | May 1, 12:05 UTC | 23h 15m |
| 2026-04-30 | CLX9724 | LUX → CGO | Apr 30, 12:00 UTC | Apr 30, 15:50 UTC | 3h 50m |
| 2026-04-29 | CLX32 | - | Apr 29, 11:35 UTC | Apr 30, 05:15 UTC | 17h 40m |
| 2026-04-29 | CLX9872 | LUX → PVG | Apr 29, 02:50 UTC | Apr 29, 18:55 UTC | 16h 6m |
| 2026-04-28 | CLX9872 | LUX → PVG | Apr 28, 21:15 UTC | Apr 29, 00:54 UTC | 3h 40m |
| 2026-04-28 | CLX45 | - | Apr 28, 07:15 UTC | Apr 28, 08:25 UTC | 1h 10m |
| 2026-04-27 | CLX45 | - | Apr 27, 11:45 UTC | Apr 28, 08:25 UTC | 20h 40m |
| 2026-04-27 | CLX7591 | - | Apr 27, 08:50 UTC | Apr 28, 08:25 UTC | 23h 35m |
| 2026-04-27 | CLX7591 | - | Apr 27, 08:10 UTC | Apr 27, 12:10 UTC | 4h 0m |
| 2026-04-26 | CLX93D | LAX → LUX | Apr 26, 11:35 UTC | Apr 26, 19:25 UTC | 7h 50m |
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 .