sensors Mode-S transponder

4D012D

ICAO 24-bit transponder address · allocated to Luxembourg

Currently assigned to LX-KCL · BOEING 747-400

Hex
4D012D
Octal
23200455
Decimal
5,046,573
Country
LU
Tail
LX-KCL
Type
B744
No current signal · last broadcast 6h ago
Flights observed
86
Distinct callsigns
20
Country
LU
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 4D012D.

Country allocation

The ICAO 24-bit address 4D012D 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
CLX7 - 5 2026-05-28
CLX69B Cargolux 5 2026-05-04
CLX91W Cargolux 4 2026-05-27
CLX81T Cargolux 4 2026-05-03
CLX56 - 4 2026-04-22
CLX515 - 4 2026-04-15
CLX43 - 4 2026-05-29
CLX9932 - 3 2026-04-14
CLX31 - 3 2026-05-23
CLX97C Cargolux 2 2026-05-28
CLX9726 Cargolux 2 2026-04-18
CLX9722 Cargolux 2 2026-04-21
CLX86N Cargolux 2 2026-05-14
CLX82 - 2 2026-05-01
CLX7751 Cargolux 2 2026-04-28
CLX6822 Cargolux 2 2026-05-13
CLX67 Cargolux 2 2026-04-27
CLX6236 Cargolux 2 2026-05-02
CLX6232 Cargolux 2 2026-05-11
CLX6225 Cargolux 2 2026-05-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CLX43 - May 29, 00:05 UTCMay 29, 19:05 UTC19h 0m
2026-05-28 CLX43 - May 28, 21:20 UTCMay 29, 19:05 UTC21h 45m
2026-05-28 CLX43 - May 28, 20:50 UTCMay 29, 19:05 UTC22h 15m
2026-05-28 CLX97C IAH → PIK May 28, 15:50 UTCMay 28, 17:10 UTC1h 20m
2026-05-28 CLX97C IAH → PIK May 28, 05:50 UTCMay 28, 14:10 UTC8h 20m
2026-05-28 CLX7 - May 28, 01:45 UTCMay 28, 02:25 UTC40m
2026-05-27 CLX7 LUX → DFW May 27, 13:35 UTCMay 27, 23:20 UTC9h 45m
2026-05-27 CLX91W ANC → ORD May 27, 01:34 UTCMay 27, 09:20 UTC7h 45m
2026-05-26 CLX91W ANC → ORD May 26, 17:25 UTCMay 26, 22:50 UTC5h 25m
2026-05-26 CLX5952 NLU → LUX May 26, 01:34 UTCMay 26, 13:10 UTC11h 35m
2026-05-25 CLX4951 - May 25, 11:00 UTCMay 25, 21:45 UTC10h 44m
2026-05-25 CLX48 - May 25, 03:50 UTCMay 25, 08:00 UTC4h 10m
2026-05-23 CLX32 - May 23, 21:20 UTCMay 24, 01:20 UTC4h 0m
2026-05-23 CLX31 - May 23, 08:40 UTCMay 23, 12:55 UTC4h 15m
2026-05-22 CLX31 - May 22, 13:20 UTCMay 23, 12:55 UTC23h 34m
2026-05-22 CLX31 - May 22, 11:20 UTCMay 23, 11:15 UTC23h 55m
2026-05-22 CLX7605 LUX → VCP May 22, 09:20 UTCMay 23, 09:15 UTC23h 54m
2026-05-20 CLX91W ANC → ORD May 20, 00:25 UTCMay 20, 07:50 UTC7h 26m
2026-05-19 CLX91W ANC → ORD May 19, 15:05 UTCMay 19, 20:45 UTC5h 40m
2026-05-19 CLX5952 NLU → LUX May 19, 02:35 UTCMay 19, 13:40 UTC11h 5m
2026-05-18 CLX4951 - May 18, 10:55 UTCMay 18, 21:50 UTC10h 54m
2026-05-17 CLX93D LAX → LUX May 17, 08:50 UTCMay 17, 16:15 UTC7h 25m
2026-05-17 CLX6696 DFW → LUX May 17, 02:50 UTCMay 17, 06:00 UTC3h 10m
2026-05-16 CLX6686 MEX → DFW May 16, 12:55 UTCMay 17, 00:30 UTC11h 35m
2026-05-16 CLX17 - May 16, 03:50 UTCMay 16, 08:01 UTC4h 11m
2026-05-14 CLX43 - May 14, 20:45 UTCMay 15, 00:45 UTC4h 0m
2026-05-14 CLX86N MIA → AMS May 14, 13:35 UTCMay 14, 14:15 UTC40m
2026-05-14 CLX86N MIA → AMS May 14, 03:00 UTCMay 14, 11:10 UTC8h 10m
2026-05-13 CLX6823 AMS → LUX May 13, 14:25 UTCMay 14, 00:25 UTC10h 0m
2026-05-13 CLX6822 CWB → UIO May 13, 10:05 UTCMay 13, 10:40 UTC35m
2026-05-12 CLX6822 CWB → UIO May 12, 20:10 UTCMay 13, 07:45 UTC11h 35m
2026-05-11 CLX6232 SCL → MIA May 11, 20:10 UTCMay 12, 12:15 UTC16h 5m
2026-05-11 CLX6232 SCL → MIA May 11, 13:20 UTCMay 12, 12:15 UTC22h 56m
2026-05-11 CLX6221 LUX → VCP May 11, 12:00 UTCMay 12, 11:15 UTC23h 16m
2026-05-10 CLX309 - May 10, 11:55 UTCMay 10, 16:20 UTC4h 25m
2026-05-10 CLX309 - May 10, 02:04 UTCMay 10, 02:24 UTC20m
2026-05-09 CLX9935 DMM → HKG May 9, 11:50 UTCMay 9, 15:50 UTC4h 0m
2026-05-06 CLX49 - May 6, 12:35 UTCMay 6, 17:00 UTC4h 25m
2026-05-05 CLX7602 LUX → CWB May 5, 07:40 UTCMay 5, 11:40 UTC4h 0m
2026-05-04 CLX69B ORD → LUX May 4, 04:15 UTCMay 4, 12:05 UTC7h 50m
2026-05-03 CLX7 - May 3, 16:05 UTCMay 4, 00:25 UTC8h 20m
2026-05-03 CLX81T MIA → AMS May 3, 12:10 UTCMay 3, 12:45 UTC35m
2026-05-03 CLX81T MIA → AMS May 3, 01:25 UTCMay 3, 09:45 UTC8h 19m
2026-05-02 CLX6236 UIO → MIA May 2, 10:45 UTCMay 2, 21:55 UTC11h 10m
2026-05-01 CLX6225 VCP → CWB May 1, 20:35 UTCMay 2, 08:00 UTC11h 26m
2026-05-01 CLX82 - May 1, 05:45 UTCMay 1, 10:10 UTC4h 25m
2026-04-30 CLX82 - Apr 30, 07:55 UTCMay 1, 07:10 UTC23h 15m
2026-04-30 CLX7534 - Apr 30, 03:40 UTCApr 30, 09:00 UTC5h 20m
2026-04-29 CLX873 - Apr 29, 12:40 UTCApr 29, 14:50 UTC2h 10m
2026-04-29 CLX63 - Apr 29, 05:05 UTCApr 29, 09:45 UTC4h 41m

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-KCL page for operator, model, and routing details .

Mode-S 4D012D frequently asked

What is Mode-S code 4D012D?
4D012D is an ICAO 24-bit transponder address. Allocated to Luxembourg. Assigned to LX-KCL.
Where is Mode-S 4D012D registered?
Mode-S code 4D012D is allocated to Luxembourg (LU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D012D broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D012D, octal 23200455, decimal 5,046,573.
What flights does 4D012D operate?
Mode-S 4D012D has broadcast 20 distinct callsigns, including CLX7, CLX69B, CLX91W, CLX81T, CLX56.