Apparatus

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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
No current signal · last broadcast 7h ago
Flights observed
148
Distinct callsigns
20
Country
LU
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 4D0131.

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
CLX79 - 7 2026-06-22
CLX7855 Cargolux 7 2026-06-14
CLX81T Cargolux 6 2026-06-21
CLX23K Cargolux 6 2026-05-29
CLX708 - 5 2026-06-14
CLX6694 Cargolux 5 2026-05-29
CLX6684 Cargolux 5 2026-05-28
CLX91W - 4 2026-07-01
CLX7334 - 4 2026-06-26
CLX7 - 4 2026-07-12
CLX6827 - 4 2026-07-06
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
CLX352 - 3 2026-06-27
CLX315 - 3 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CLX9004 GYD → LUX Jul 17, 06:50 UTCJul 17, 19:25 UTC12h 35m
2026-07-16 CLX968 LUX → TPE Jul 16, 07:00 UTCJul 16, 18:50 UTC11h 50m
2026-07-14 CLX46C YYC → LUX Jul 14, 08:15 UTCJul 14, 16:40 UTC8h 25m
2026-07-14 CLX46C SEA → YYC Jul 14, 04:15 UTCJul 14, 05:20 UTC1h 5m
2026-07-13 CLX1 - Jul 13, 15:40 UTCJul 14, 01:25 UTC9h 45m
2026-07-13 CLX69B - Jul 13, 03:45 UTCJul 13, 11:30 UTC7h 45m
2026-07-12 CLX7 - Jul 12, 16:20 UTCJul 13, 00:40 UTC8h 20m
2026-07-11 CLX6735 - Jul 11, 17:55 UTCJul 12, 04:30 UTC10h 35m
2026-07-09 CLX48A - Jul 9, 23:15 UTCJul 10, 15:15 UTC16h 0m
2026-07-09 CLX48A - Jul 9, 20:15 UTCJul 9, 20:45 UTC30m
2026-07-06 CLX6821 - Jul 6, 06:20 UTCJul 6, 17:00 UTC10h 40m
2026-07-06 CLX6827 - Jul 6, 03:25 UTCJul 6, 04:10 UTC45m
2026-07-05 CLX6827 - Jul 5, 13:00 UTCJul 6, 00:05 UTC11h 5m
2026-07-05 CLX14W - Jul 5, 00:05 UTCJul 5, 10:05 UTC10h 0m
2026-07-04 CLX9 - Jul 4, 10:05 UTCJul 4, 21:15 UTC11h 10m
2026-07-02 CLX5962 - Jul 2, 17:20 UTCJul 3, 04:10 UTC10h 50m
2026-07-01 CLX5962 - Jul 1, 15:45 UTCJul 2, 00:25 UTC8h 40m
2026-07-01 CLX91W - Jul 1, 08:00 UTCJul 1, 10:00 UTC2h 0m
2026-06-30 CLX91W ANC → ORD Jun 30, 19:05 UTCJul 1, 00:55 UTC5h 50m
2026-06-30 CLX5952 - Jun 30, 05:55 UTCJun 30, 17:10 UTC11h 15m
2026-06-29 CLX4951 - Jun 29, 11:29 UTCJun 29, 23:14 UTC11h 45m
2026-06-29 CLX17G - Jun 29, 03:10 UTCJun 29, 04:30 UTC1h 20m
2026-06-28 CLX17G - Jun 28, 16:05 UTCJun 29, 00:24 UTC8h 20m
2026-06-28 CLX3 - Jun 28, 09:25 UTCJun 28, 11:35 UTC2h 10m
2026-06-27 CLX3 - Jun 27, 19:49 UTCJun 28, 06:34 UTC10h 45m
2026-06-27 CLX352 BUD → LUX Jun 27, 14:14 UTCJun 27, 15:39 UTC1h 25m
2026-06-27 CLX352 - Jun 27, 09:19 UTCJun 27, 12:34 UTC3h 15m
2026-06-26 CLX352 - Jun 26, 23:09 UTCJun 26, 23:25 UTC15m
2026-06-26 CLX7334 - Jun 26, 18:49 UTCJun 26, 18:54 UTC5m
2026-06-26 CLX7334 - Jun 26, 15:49 UTCJun 26, 16:49 UTC1h 0m
2026-06-26 CLX7334 - Jun 26, 11:49 UTCJun 26, 13:40 UTC1h 50m
2026-06-25 CLX7334 - Jun 25, 20:14 UTCJun 26, 00:05 UTC3h 50m
2026-06-25 CLX86N AMS → LUX Jun 25, 12:44 UTCJun 25, 13:24 UTC40m
2026-06-25 CLX86N - Jun 25, 02:49 UTCJun 25, 10:39 UTC7h 50m
2026-06-24 CLX6823 AMS → LUX Jun 24, 14:00 UTCJun 24, 23:54 UTC9h 55m
2026-06-24 CLX6822 CWB → UIO Jun 24, 09:55 UTCJun 24, 10:35 UTC40m
2026-06-23 CLX6822 CWB → UIO Jun 23, 20:49 UTCJun 24, 07:59 UTC11h 10m
2026-06-22 CLX79 - Jun 22, 23:24 UTCJun 23, 12:29 UTC13h 5m
2026-06-22 CLX79 - Jun 22, 16:20 UTCJun 23, 12:29 UTC20h 10m
2026-06-22 CLX79 - Jun 22, 16:10 UTCJun 23, 12:29 UTC20h 20m
2026-06-21 CLX65 - Jun 21, 22:20 UTCJun 22, 16:29 UTC18h 10m
2026-06-21 CLX65 - Jun 21, 21:10 UTCJun 22, 16:29 UTC19h 20m
2026-06-21 CLX81T MIA → AMS Jun 21, 13:24 UTCJun 21, 14:05 UTC40m
2026-06-21 CLX81T MIA → AMS Jun 21, 03:40 UTCJun 21, 11:20 UTC7h 40m
2026-06-20 CLX6236 UIO → MIA Jun 20, 12:24 UTCJun 20, 23:50 UTC11h 25m
2026-06-19 CLX6225 VCP → CWB Jun 19, 20:14 UTCJun 20, 07:14 UTC11h 0m
2026-06-19 CLX75V SJU → LUX Jun 19, 08:50 UTCJun 19, 16:49 UTC8h 0m
2026-06-19 CLX75V SJU → LUX Jun 19, 08:04 UTCJun 19, 08:34 UTC30m
2026-06-19 CLX8 - Jun 19, 02:29 UTCJun 19, 05:49 UTC3h 20m
2026-06-18 CLX8 - Jun 18, 15:25 UTCJun 18, 23:50 UTC8h 25m

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 .

Mode-S 4D0131 frequently asked

What is Mode-S code 4D0131?
4D0131 is an ICAO 24-bit transponder address. Allocated to Luxembourg. Assigned to LX-NCL.
Where is Mode-S 4D0131 registered?
Mode-S code 4D0131 is allocated to Luxembourg (LU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D0131 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D0131, octal 23200461, decimal 5,046,577.
What flights does 4D0131 operate?
Mode-S 4D0131 has broadcast 20 distinct callsigns, including CLX79, CLX7855, CLX81T, CLX23K, CLX708.