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
- 169
- Distinct callsigns
- 20
- Country
- LU
- Last broadcast
- Jul 26, 12:05 UTC
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 |
|---|---|---|---|
| CLX7855 | Cargolux | 9 | 2026-07-18 |
| CLX708 | - | 8 | 2026-07-19 |
| CLX79 | - | 7 | 2026-06-22 |
| CLX81T | Cargolux | 6 | 2026-06-21 |
| CLX23K | Cargolux | 6 | 2026-05-29 |
| CLX6694 | Cargolux | 5 | 2026-05-29 |
| CLX6684 | Cargolux | 5 | 2026-05-28 |
| CLX91W | - | 4 | 2026-07-01 |
| CLX86N | Cargolux | 4 | 2026-07-23 |
| CLX7334 | - | 4 | 2026-06-26 |
| CLX7 | - | 4 | 2026-07-12 |
| CLX6827 | - | 4 | 2026-07-06 |
| CLX6822 | Cargolux | 4 | 2026-07-22 |
| CLX65 | - | 4 | 2026-06-21 |
| CLX67 | Cargolux | 3 | 2026-06-01 |
| CLX6236 | Cargolux | 3 | 2026-06-20 |
| CLX6225 | Cargolux | 3 | 2026-06-19 |
| CLX54 | - | 3 | 2026-06-09 |
| CLX515 | - | 3 | 2026-06-03 |
| CLX492 | - | 3 | 2026-05-28 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | CLX87C | ATL → LUX | Jul 26, 04:15 UTC | Jul 26, 12:00 UTC | 7h 46m |
| 2026-07-26 | CLX87C | ATL → LUX | Jul 26, 03:55 UTC | Jul 26, 04:00 UTC | 5m |
| 2026-07-25 | CLX4 | - | Jul 25, 23:15 UTC | Jul 26, 00:15 UTC | 1h 0m |
| 2026-07-25 | CLX4 | - | Jul 25, 13:05 UTC | Jul 25, 21:25 UTC | 8h 20m |
| 2026-07-24 | CLX6585 | NLU → LUX | Jul 24, 23:55 UTC | Jul 25, 10:00 UTC | 10h 5m |
| 2026-07-24 | CLX6575 | MEX → LUX | Jul 24, 09:55 UTC | Jul 24, 20:30 UTC | 10h 35m |
| 2026-07-24 | CLX41G | MIA → AMS | Jul 24, 06:20 UTC | Jul 24, 06:40 UTC | 20m |
| 2026-07-23 | CLX86N | MIA → AMS | Jul 23, 13:55 UTC | Jul 23, 14:30 UTC | 35m |
| 2026-07-23 | CLX86N | MIA → AMS | Jul 23, 03:35 UTC | Jul 23, 11:45 UTC | 8h 10m |
| 2026-07-22 | CLX6823 | AMS → LUX | Jul 22, 15:15 UTC | Jul 23, 01:00 UTC | 9h 45m |
| 2026-07-22 | CLX6822 | CWB → UIO | Jul 22, 11:10 UTC | Jul 22, 11:35 UTC | 25m |
| 2026-07-21 | CLX6822 | CWB → UIO | Jul 21, 21:00 UTC | Jul 22, 10:25 UTC | 13h 25m |
| 2026-07-21 | CLX753 | HKG → LUX | Jul 21, 09:05 UTC | Jul 21, 13:35 UTC | 4h 30m |
| 2026-07-20 | CLX753 | HKG → LUX | Jul 20, 23:20 UTC | Jul 20, 23:35 UTC | 15m |
| 2026-07-20 | CLX9937 | LUX → HKG | Jul 20, 06:40 UTC | Jul 20, 07:10 UTC | 30m |
| 2026-07-19 | CLX9937 | LUX → HKG | Jul 19, 20:10 UTC | Jul 19, 23:50 UTC | 3h 40m |
| 2026-07-19 | CLX708 | BUD → LUX | Jul 19, 14:15 UTC | Jul 19, 15:50 UTC | 1h 35m |
| 2026-07-19 | CLX708 | - | Jul 19, 09:40 UTC | Jul 19, 12:50 UTC | 3h 10m |
| 2026-07-19 | CLX708 | - | Jul 19, 00:10 UTC | Jul 19, 00:25 UTC | 15m |
| 2026-07-18 | CLX7855 | SGN → HKG | Jul 18, 21:45 UTC | Jul 18, 22:05 UTC | 20m |
| 2026-07-18 | CLX7855 | SGN → HKG | Jul 18, 04:50 UTC | Jul 18, 15:45 UTC | 10h 55m |
| 2026-07-17 | CLX9004 | GYD → LUX | Jul 17, 06:50 UTC | Jul 17, 19:25 UTC | 12h 35m |
| 2026-07-16 | CLX968 | LUX → TPE | Jul 16, 07:00 UTC | Jul 16, 18:50 UTC | 11h 50m |
| 2026-07-14 | CLX46C | YYC → LUX | Jul 14, 08:15 UTC | Jul 14, 16:40 UTC | 8h 25m |
| 2026-07-14 | CLX46C | SEA → YYC | Jul 14, 04:15 UTC | Jul 14, 05:20 UTC | 1h 5m |
| 2026-07-13 | CLX1 | - | Jul 13, 15:40 UTC | Jul 14, 01:25 UTC | 9h 45m |
| 2026-07-13 | CLX69B | - | Jul 13, 03:45 UTC | Jul 13, 11:30 UTC | 7h 45m |
| 2026-07-12 | CLX7 | - | Jul 12, 16:20 UTC | Jul 13, 00:40 UTC | 8h 20m |
| 2026-07-11 | CLX6735 | - | Jul 11, 17:55 UTC | Jul 12, 04:30 UTC | 10h 35m |
| 2026-07-09 | CLX48A | - | Jul 9, 23:15 UTC | Jul 10, 15:15 UTC | 16h 0m |
| 2026-07-09 | CLX48A | - | Jul 9, 20:15 UTC | Jul 9, 20:45 UTC | 30m |
| 2026-07-06 | CLX6821 | - | Jul 6, 06:20 UTC | Jul 6, 17:00 UTC | 10h 40m |
| 2026-07-06 | CLX6827 | - | Jul 6, 03:25 UTC | Jul 6, 04:10 UTC | 45m |
| 2026-07-05 | CLX6827 | - | Jul 5, 13:00 UTC | Jul 6, 00:05 UTC | 11h 5m |
| 2026-07-05 | CLX14W | - | Jul 5, 00:05 UTC | Jul 5, 10:05 UTC | 10h 0m |
| 2026-07-04 | CLX9 | - | Jul 4, 10:05 UTC | Jul 4, 21:15 UTC | 11h 10m |
| 2026-07-02 | CLX5962 | - | Jul 2, 17:20 UTC | Jul 3, 04:10 UTC | 10h 50m |
| 2026-07-01 | CLX5962 | - | Jul 1, 15:45 UTC | Jul 2, 00:25 UTC | 8h 40m |
| 2026-07-01 | CLX91W | - | Jul 1, 08:00 UTC | Jul 1, 10:00 UTC | 2h 0m |
| 2026-06-30 | CLX91W | ANC → ORD | Jun 30, 19:05 UTC | Jul 1, 00:55 UTC | 5h 50m |
| 2026-06-30 | CLX5952 | - | Jun 30, 05:55 UTC | Jun 30, 17:10 UTC | 11h 15m |
| 2026-06-29 | CLX4951 | - | Jun 29, 11:29 UTC | Jun 29, 23:14 UTC | 11h 45m |
| 2026-06-29 | CLX17G | - | Jun 29, 03:10 UTC | Jun 29, 04:30 UTC | 1h 20m |
| 2026-06-28 | CLX17G | - | Jun 28, 16:05 UTC | Jun 29, 00:24 UTC | 8h 20m |
| 2026-06-28 | CLX3 | - | Jun 28, 09:25 UTC | Jun 28, 11:35 UTC | 2h 10m |
| 2026-06-27 | CLX3 | - | Jun 27, 19:49 UTC | Jun 28, 06:34 UTC | 10h 45m |
| 2026-06-27 | CLX352 | BUD → LUX | Jun 27, 14:14 UTC | Jun 27, 15:39 UTC | 1h 25m |
| 2026-06-27 | CLX352 | - | Jun 27, 09:19 UTC | Jun 27, 12:34 UTC | 3h 15m |
| 2026-06-26 | CLX352 | - | Jun 26, 23:09 UTC | Jun 26, 23:25 UTC | 15m |
| 2026-06-26 | CLX7334 | - | Jun 26, 18:49 UTC | Jun 26, 18:54 UTC | 5m |
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 .