sensors Mode-S transponder
4D0131
ICAO 24-bit transponder address · allocated to Luxembourg
Currently assigned to LX-NCL · BOEING 747-400
- Hex
- 4D0131
- Octal
- 23200461
- Decimal
- 5,046,577
- Country
- LU
- Tail
- LX-NCL
- Type
- B744
- Flights observed
- 61
- Distinct callsigns
- 20
- Country
- LU
- Last broadcast
- 6h ago
Last known position
Country allocation
The ICAO 24-bit address 4D0131 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 |
|---|---|---|---|
| CLX23K | Cargolux | 6 | 2026-05-29 |
| CLX7855 | Cargolux | 5 | 2026-04-18 |
| CLX6694 | Cargolux | 5 | 2026-05-29 |
| CLX6684 | Cargolux | 5 | 2026-05-28 |
| CLX708 | - | 3 | 2026-04-19 |
| CLX67 | Cargolux | 3 | 2026-06-01 |
| CLX492 | - | 3 | 2026-05-28 |
| CLX315 | - | 3 | 2026-05-31 |
| CLX97C | Cargolux | 2 | 2026-05-14 |
| CLX81T | Cargolux | 2 | 2026-05-24 |
| CLX79 | - | 2 | 2026-05-16 |
| CLX7 | - | 2 | 2026-05-14 |
| CLX6827 | Cargolux | 2 | 2026-05-17 |
| CLX63 | - | 2 | 2026-05-13 |
| CLX56 | - | 2 | 2026-05-20 |
| CLX9932 | Cargolux | 1 | 2026-06-02 |
| CLX9725 | Cargolux | 1 | 2026-05-15 |
| CLX9722 | Cargolux | 1 | 2026-05-19 |
| CLX7751 | Cargolux | 1 | 2026-05-12 |
| CLX74A | Cargolux | 1 | 2026-05-16 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-02 | CLX9932 | DWC → LUX | Jun 2, 12:45 UTC | Jun 2, 16:40 UTC | 3h 55m |
| 2026-06-01 | CLX67 | LAX → MXP | Jun 1, 19:40 UTC | Jun 1, 20:30 UTC | 50m |
| 2026-06-01 | CLX67 | LAX → MXP | Jun 1, 19:20 UTC | Jun 1, 19:25 UTC | 5m |
| 2026-06-01 | CLX67 | LAX → MXP | Jun 1, 06:20 UTC | Jun 1, 17:10 UTC | 10h 50m |
| 2026-05-31 | CLX5 | - | May 31, 16:10 UTC | Jun 1, 03:00 UTC | 10h 50m |
| 2026-05-31 | CLX315 | AMS → LUX | May 31, 12:40 UTC | May 31, 13:15 UTC | 35m |
| 2026-05-31 | CLX315 | - | May 31, 08:25 UTC | May 31, 10:55 UTC | 2h 30m |
| 2026-05-30 | CLX315 | - | May 30, 20:15 UTC | May 30, 20:40 UTC | 25m |
| 2026-05-30 | CLX314 | - | May 30, 07:30 UTC | May 30, 17:25 UTC | 9h 55m |
| 2026-05-29 | CLX23K | IAH → LUX | May 29, 19:30 UTC | May 30, 04:30 UTC | 9h 0m |
| 2026-05-29 | CLX6694 | GDL → LUX | May 29, 07:05 UTC | May 29, 11:25 UTC | 4h 20m |
| 2026-05-28 | CLX6684 | MEX → GDL | May 28, 15:55 UTC | May 29, 02:55 UTC | 11h 0m |
| 2026-05-28 | CLX492 | - | May 28, 11:15 UTC | May 28, 11:55 UTC | 40m |
| 2026-05-28 | CLX492 | - | May 28, 05:50 UTC | May 28, 09:10 UTC | 3h 20m |
| 2026-05-27 | CLX492 | - | May 27, 18:05 UTC | May 27, 18:30 UTC | 25m |
| 2026-05-27 | CLX491 | - | May 27, 05:24 UTC | May 27, 15:20 UTC | 9h 56m |
| 2026-05-24 | CLX81T | MIA → AMS | May 24, 12:00 UTC | May 24, 12:35 UTC | 35m |
| 2026-05-24 | CLX81T | MIA → AMS | May 24, 02:00 UTC | May 24, 09:45 UTC | 7h 45m |
| 2026-05-23 | CLX6236 | UIO → MIA | May 23, 10:30 UTC | May 23, 22:00 UTC | 11h 31m |
| 2026-05-22 | CLX6225 | VCP → CWB | May 22, 20:25 UTC | May 23, 07:40 UTC | 11h 15m |
| 2026-05-22 | CLX23K | IAH → LUX | May 22, 06:35 UTC | May 22, 15:00 UTC | 8h 25m |
| 2026-05-21 | CLX6694 | GDL → LUX | May 21, 23:20 UTC | May 22, 03:45 UTC | 4h 25m |
| 2026-05-21 | CLX6684 | MEX → GDL | May 21, 08:55 UTC | May 21, 20:20 UTC | 11h 25m |
| 2026-05-20 | CLX56 | - | May 20, 20:20 UTC | May 20, 21:05 UTC | 45m |
| 2026-05-20 | CLX56 | - | May 20, 13:40 UTC | May 20, 18:30 UTC | 4h 50m |
| 2026-05-19 | CLX9722 | LUX → CGO | May 19, 04:25 UTC | May 19, 08:25 UTC | 4h 0m |
| 2026-05-18 | CLX6821 | VCP → LUX | May 18, 03:01 UTC | May 18, 13:45 UTC | 10h 45m |
| 2026-05-17 | CLX6827 | GIG → VCP | May 17, 23:15 UTC | May 18, 00:05 UTC | 50m |
| 2026-05-17 | CLX6827 | GIG → VCP | May 17, 09:30 UTC | May 17, 20:30 UTC | 11h 0m |
| 2026-05-16 | CLX74A | JFK → LUX | May 16, 23:25 UTC | May 17, 05:55 UTC | 6h 30m |
| 2026-05-16 | CLX2 | - | May 16, 12:21 UTC | May 16, 20:00 UTC | 7h 40m |
| 2026-05-16 | CLX79 | - | May 16, 03:35 UTC | May 16, 07:41 UTC | 4h 6m |
| 2026-05-15 | CLX79 | - | May 15, 06:20 UTC | May 16, 04:45 UTC | 22h 24m |
| 2026-05-15 | CLX9725 | LUX → CGO | May 15, 04:35 UTC | May 16, 04:15 UTC | 23h 39m |
| 2026-05-14 | CLX97C | IAH → PIK | May 14, 15:35 UTC | May 14, 17:00 UTC | 1h 25m |
| 2026-05-14 | CLX97C | IAH → PIK | May 14, 05:45 UTC | May 14, 14:01 UTC | 8h 15m |
| 2026-05-14 | CLX7 | - | May 14, 01:30 UTC | May 14, 02:10 UTC | 40m |
| 2026-05-13 | CLX7 | - | May 13, 13:31 UTC | May 13, 23:05 UTC | 9h 35m |
| 2026-05-13 | CLX63 | - | May 13, 03:35 UTC | May 13, 04:45 UTC | 1h 10m |
| 2026-05-12 | CLX63 | - | May 12, 06:20 UTC | May 13, 04:45 UTC | 22h 25m |
| 2026-05-12 | CLX7751 | LUX → CGO | May 12, 04:50 UTC | May 13, 04:15 UTC | 23h 25m |
| 2026-05-11 | CLX48 | - | May 11, 03:05 UTC | May 11, 07:20 UTC | 4h 15m |
| 2026-05-09 | CLX32 | - | May 9, 21:14 UTC | May 10, 01:09 UTC | 3h 55m |
| 2026-04-19 | CLX708 | BUD → LUX | Apr 19, 17:25 UTC | Apr 19, 19:00 UTC | 1h 35m |
| 2026-04-19 | CLX708 | - | Apr 19, 12:35 UTC | Apr 19, 15:45 UTC | 3h 10m |
| 2026-04-19 | CLX708 | - | Apr 19, 02:35 UTC | Apr 19, 02:50 UTC | 15m |
| 2026-04-18 | CLX7855 | SGN → HKG | Apr 18, 23:00 UTC | Apr 18, 23:15 UTC | 15m |
| 2026-04-18 | CLX7855 | SGN → HKG | Apr 18, 07:25 UTC | Apr 18, 08:00 UTC | 35m |
| 2026-04-18 | CLX7855 | SGN → HKG | Apr 18, 05:25 UTC | Apr 18, 07:20 UTC | 1h 55m |
| 2026-04-18 | CLX7855 | SGN → HKG | Apr 18, 04:45 UTC | Apr 18, 06:20 UTC | 1h 35m |
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-NCL page for operator, model, and routing details .