sensors Mode-S transponder
4D0140
ICAO 24-bit transponder address · allocated to Luxembourg
Currently assigned to LX-OCV · BOEING 747-400
- Hex
- 4D0140
- Octal
- 23200500
- Decimal
- 5,046,592
- Country
- LU
- Tail
- LX-OCV
- Type
- B744
- Flights observed
- 173
- Distinct callsigns
- 20
- Country
- LU
- Last broadcast
- 18h ago
Last known position
Country allocation
The ICAO 24-bit address 4D0140 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 |
|---|---|---|---|
| CLX9 | - | 14 | 2026-06-12 |
| CLX708 | - | 9 | 2026-07-05 |
| CLX8 | - | 7 | 2026-06-26 |
| CLX7 | - | 7 | 2026-05-24 |
| CLX9723 | Cargolux | 6 | 2026-06-24 |
| CLX7855 | - | 6 | 2026-07-04 |
| CLX67 | Cargolux | 6 | 2026-06-16 |
| CLX65 | - | 6 | 2026-07-06 |
| CLX32 | - | 6 | 2026-07-08 |
| CLX309 | - | 6 | 2026-07-12 |
| CLX3 | - | 6 | 2026-06-21 |
| CLX9935 | - | 5 | 2026-07-11 |
| CLX9872 | - | 5 | 2026-07-08 |
| CLX97C | Cargolux | 5 | 2026-04-16 |
| CLX42 | - | 5 | 2026-06-25 |
| CLX7605 | Cargolux | 4 | 2026-06-19 |
| CLX7603 | Cargolux | 4 | 2026-05-20 |
| CLX56 | - | 4 | 2026-04-29 |
| CLX31 | - | 4 | 2026-06-20 |
| CLX17G | Cargolux | 4 | 2026-06-21 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | CLX6697 | - | Jul 13, 00:55 UTC | Jul 13, 14:45 UTC | 13h 50m |
| 2026-07-12 | CLX6687 | - | Jul 12, 11:20 UTC | Jul 12, 22:25 UTC | 11h 5m |
| 2026-07-12 | CLX309 | - | Jul 12, 04:30 UTC | Jul 12, 04:50 UTC | 20m |
| 2026-07-12 | CLX309 | - | Jul 12, 00:25 UTC | Jul 12, 01:40 UTC | 1h 15m |
| 2026-07-11 | CLX309 | - | Jul 11, 14:30 UTC | Jul 11, 14:50 UTC | 20m |
| 2026-07-11 | CLX9935 | - | Jul 11, 10:30 UTC | Jul 11, 11:00 UTC | 30m |
| 2026-07-10 | CLX9935 | - | Jul 10, 21:25 UTC | Jul 11, 05:55 UTC | 8h 30m |
| 2026-07-10 | CLX6725 | - | Jul 10, 07:35 UTC | Jul 10, 18:15 UTC | 10h 40m |
| 2026-07-09 | CLX34C | - | Jul 9, 16:00 UTC | Jul 10, 05:20 UTC | 13h 20m |
| 2026-07-09 | CLX34C | - | Jul 9, 13:15 UTC | Jul 9, 13:40 UTC | 25m |
| 2026-07-08 | CLX32 | - | Jul 8, 19:50 UTC | Jul 9, 10:20 UTC | 14h 30m |
| 2026-07-08 | CLX32 | - | Jul 8, 11:25 UTC | Jul 9, 10:00 UTC | 22h 35m |
| 2026-07-08 | CLX9872 | - | Jul 8, 03:10 UTC | Jul 8, 20:05 UTC | 16h 55m |
| 2026-07-07 | CLX9872 | - | Jul 7, 21:40 UTC | Jul 8, 00:05 UTC | 2h 25m |
| 2026-07-06 | CLX79 | - | Jul 6, 18:55 UTC | Jul 7, 08:15 UTC | 13h 20m |
| 2026-07-06 | CLX65 | - | Jul 6, 00:10 UTC | Jul 6, 19:15 UTC | 19h 5m |
| 2026-07-05 | CLX65 | - | Jul 5, 22:05 UTC | Jul 6, 19:15 UTC | 21h 10m |
| 2026-07-05 | CLX65 | - | Jul 5, 20:50 UTC | Jul 6, 19:15 UTC | 22h 25m |
| 2026-07-05 | CLX708 | BUD → LUX | Jul 5, 16:20 UTC | Jul 5, 17:50 UTC | 1h 30m |
| 2026-07-05 | CLX708 | - | Jul 5, 11:30 UTC | Jul 5, 14:35 UTC | 3h 5m |
| 2026-07-05 | CLX708 | - | Jul 5, 02:05 UTC | Jul 5, 02:25 UTC | 20m |
| 2026-07-04 | CLX7855 | - | Jul 4, 22:55 UTC | Jul 4, 23:15 UTC | 20m |
| 2026-07-04 | CLX7855 | - | Jul 4, 05:40 UTC | Jul 4, 16:30 UTC | 10h 50m |
| 2026-06-29 | CLX24D | - | Jun 29, 02:45 UTC | Jun 29, 09:05 UTC | 6h 20m |
| 2026-06-28 | CLX65C | - | Jun 28, 15:20 UTC | Jun 28, 23:14 UTC | 7h 55m |
| 2026-06-28 | CLX65C | - | Jun 28, 11:35 UTC | Jun 28, 12:09 UTC | 35m |
| 2026-06-27 | CLX57 | - | Jun 27, 18:35 UTC | Jun 28, 07:40 UTC | 13h 5m |
| 2026-06-27 | CLX57 | - | Jun 27, 11:14 UTC | Jun 28, 07:40 UTC | 20h 25m |
| 2026-06-27 | CLX58 | - | Jun 27, 00:05 UTC | Jun 27, 18:49 UTC | 18h 45m |
| 2026-06-26 | CLX58 | - | Jun 26, 22:05 UTC | Jun 27, 18:49 UTC | 20h 45m |
| 2026-06-26 | CLX75V | - | Jun 26, 10:50 UTC | Jun 26, 18:49 UTC | 8h 0m |
| 2026-06-26 | CLX8 | - | Jun 26, 07:35 UTC | Jun 26, 07:50 UTC | 15m |
| 2026-06-26 | CLX8 | - | Jun 26, 04:45 UTC | Jun 26, 06:04 UTC | 1h 20m |
| 2026-06-25 | CLX8 | LUX → ATL | Jun 25, 16:14 UTC | Jun 26, 01:24 UTC | 9h 10m |
| 2026-06-25 | CLX42 | - | Jun 25, 04:04 UTC | Jun 25, 08:20 UTC | 4h 15m |
| 2026-06-24 | CLX9723 | LUX → CGO | Jun 24, 06:04 UTC | Jun 25, 05:25 UTC | 23h 20m |
| 2026-06-24 | CLX9723 | LUX → CGO | Jun 24, 05:20 UTC | Jun 24, 07:54 UTC | 2h 35m |
| 2026-06-21 | CLX17G | SEA → PIK | Jun 21, 21:19 UTC | Jun 21, 22:40 UTC | 1h 20m |
| 2026-06-21 | CLX17G | SEA → PIK | Jun 21, 10:14 UTC | Jun 21, 18:29 UTC | 8h 15m |
| 2026-06-21 | CLX3 | - | Jun 21, 05:00 UTC | Jun 21, 07:09 UTC | 2h 10m |
| 2026-06-20 | CLX3 | - | Jun 20, 15:19 UTC | Jun 21, 02:24 UTC | 11h 5m |
| 2026-06-20 | CLX31 | - | Jun 20, 07:54 UTC | Jun 20, 12:19 UTC | 4h 25m |
| 2026-06-19 | CLX31 | - | Jun 19, 12:04 UTC | Jun 20, 11:59 UTC | 23h 55m |
| 2026-06-19 | CLX7605 | LUX → VCP | Jun 19, 10:04 UTC | Jun 20, 09:19 UTC | 23h 15m |
| 2026-06-19 | CLX7605 | LUX → VCP | Jun 19, 09:34 UTC | Jun 19, 13:29 UTC | 3h 55m |
| 2026-06-16 | CLX67 | LAX → MXP | Jun 16, 10:49 UTC | Jun 16, 11:45 UTC | 55m |
| 2026-06-15 | CLX67 | LAX → MXP | Jun 15, 22:15 UTC | Jun 16, 09:10 UTC | 10h 55m |
| 2026-06-15 | CLX5 | - | Jun 15, 08:29 UTC | Jun 15, 19:14 UTC | 10h 45m |
| 2026-06-15 | CLX17G | SEA → PIK | Jun 15, 04:25 UTC | Jun 15, 05:40 UTC | 1h 15m |
| 2026-06-14 | CLX17G | SEA → PIK | Jun 14, 17:15 UTC | Jun 15, 01:25 UTC | 8h 9m |
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-OCV page for operator, model, and routing details .