Apparatus

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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
Broadcasting now · callsign CLX5722 · 17,750 ft
Flights observed
168
Distinct callsigns
20
Country
LU
Last broadcast
3h ago

Current position

4D012D is currently broadcasting. Map zoomed to live position.

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
CLX91W Cargolux 7 2026-06-10
CLX81T - 6 2026-06-28
CLX56 - 6 2026-07-05
CLX7 - 5 2026-05-28
CLX69B Cargolux 5 2026-05-04
CLX54 - 5 2026-07-06
CLX22 Cargolux 5 2026-06-19
CLX85 - 4 2026-07-07
CLX6827 - 4 2026-06-29
CLX515 - 4 2026-04-15
CLX43 - 4 2026-05-29
CLX9932 - 3 2026-04-14
CLX9726 - 3 2026-07-04
CLX9724 Cargolux 3 2026-06-18
CLX708 - 3 2026-07-12
CLX6236 - 3 2026-06-27
CLX6225 - 3 2026-06-26
CLX5952 Cargolux 3 2026-06-09
CLX4951 - 3 2026-06-08
CLX32 - 3 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CLX4731 - Jul 13, 12:35 UTCJul 13, 23:00 UTC10h 25m
2026-07-12 CLX708 BUD → LUX Jul 12, 14:45 UTCJul 12, 16:10 UTC1h 25m
2026-07-12 CLX708 - Jul 12, 10:15 UTCJul 12, 13:30 UTC3h 15m
2026-07-12 CLX708 - Jul 12, 00:50 UTCJul 12, 01:10 UTC20m
2026-07-11 CLX7855 - Jul 11, 21:10 UTCJul 11, 21:25 UTC15m
2026-07-11 CLX7855 - Jul 11, 04:30 UTCJul 11, 14:55 UTC10h 25m
2026-07-10 CLX56R - Jul 10, 09:10 UTCJul 10, 19:30 UTC10h 20m
2026-07-09 CLX5164 - Jul 9, 23:40 UTCJul 10, 05:25 UTC5h 45m
2026-07-09 CLX5163 - Jul 9, 14:40 UTCJul 9, 20:35 UTC5h 55m
2026-07-09 CLX245 HKG → ANC Jul 9, 03:10 UTCJul 9, 13:05 UTC9h 55m
2026-07-08 CLX4162 - Jul 8, 13:20 UTCJul 9, 00:20 UTC11h 0m
2026-07-07 CLX85 - Jul 7, 21:05 UTCJul 8, 10:20 UTC13h 15m
2026-07-07 CLX85 - Jul 7, 10:50 UTCJul 8, 09:15 UTC22h 25m
2026-07-06 CLX54 - Jul 6, 23:20 UTCJul 7, 21:25 UTC22h 5m
2026-07-06 CLX54 - Jul 6, 21:25 UTCJul 7, 21:15 UTC23h 50m
2026-07-06 CLX6697 - Jul 6, 00:25 UTCJul 6, 13:45 UTC13h 20m
2026-07-05 CLX6687 - Jul 5, 09:40 UTCJul 5, 20:50 UTC11h 10m
2026-07-05 CLX56 - Jul 5, 02:05 UTCJul 5, 06:35 UTC4h 30m
2026-07-04 CLX56 - Jul 4, 05:20 UTCJul 5, 03:25 UTC22h 5m
2026-07-04 CLX9726 - Jul 4, 04:10 UTCJul 5, 03:15 UTC23h 5m
2026-07-03 CLX23K - Jul 3, 10:30 UTCJul 3, 19:25 UTC8h 55m
2026-07-02 CLX6694 - Jul 2, 23:10 UTCJul 3, 04:30 UTC5h 20m
2026-07-02 CLX6684 - Jul 2, 09:15 UTCJul 2, 20:10 UTC10h 55m
2026-07-01 CLX6562 - Jul 1, 03:20 UTCJul 1, 13:30 UTC10h 10m
2026-06-30 CLX6562 - Jun 30, 22:25 UTCJun 30, 22:40 UTC15m
2026-06-30 CLX6551 - Jun 30, 16:35 UTCJun 30, 19:20 UTC2h 45m
2026-06-30 CLX30D - Jun 30, 05:25 UTCJun 30, 13:40 UTC8h 15m
2026-06-29 CLX6821 - Jun 29, 09:20 UTCJun 29, 20:00 UTC10h 40m
2026-06-29 CLX6827 - Jun 29, 05:24 UTCJun 29, 05:59 UTC35m
2026-06-28 CLX6827 - Jun 28, 15:44 UTCJun 29, 02:45 UTC11h 0m
2026-06-28 CLX81T AMS → LUX Jun 28, 10:44 UTCJun 28, 11:25 UTC40m
2026-06-28 CLX81T - Jun 28, 00:59 UTCJun 28, 08:44 UTC7h 45m
2026-06-27 CLX6236 - Jun 27, 10:19 UTCJun 27, 21:44 UTC11h 25m
2026-06-26 CLX6225 - Jun 26, 20:50 UTCJun 27, 07:45 UTC10h 55m
2026-06-22 CLX6697 - Jun 22, 00:20 UTCJun 22, 13:39 UTC13h 20m
2026-06-21 CLX6687 MEX → GDL Jun 21, 10:34 UTCJun 21, 21:34 UTC11h 0m
2026-06-20 CLX57 - Jun 20, 18:29 UTCJun 21, 07:49 UTC13h 20m
2026-06-20 CLX57 - Jun 20, 11:40 UTCJun 21, 07:49 UTC20h 10m
2026-06-19 CLX58 - Jun 19, 23:19 UTCJun 20, 18:49 UTC19h 30m
2026-06-19 CLX58 - Jun 19, 21:44 UTCJun 20, 18:49 UTC21h 5m
2026-06-19 CLX22 STN → LUX Jun 19, 16:14 UTCJun 19, 17:04 UTC50m
2026-06-19 CLX22 STN → LUX Jun 19, 09:24 UTCJun 19, 14:24 UTC5h 0m
2026-06-18 CLX22 STN → LUX Jun 18, 13:50 UTCJun 19, 13:14 UTC23h 24m
2026-06-18 CLX9724 LUX → CGO Jun 18, 11:20 UTCJun 19, 10:39 UTC23h 19m
2026-06-18 CLX9724 LUX → CGO Jun 18, 10:30 UTCJun 18, 14:20 UTC3h 50m
2026-06-18 CLX32 - Jun 18, 03:35 UTCJun 18, 04:50 UTC1h 15m
2026-06-17 CLX9872 LUX → PVG Jun 17, 03:20 UTCJun 17, 03:50 UTC30m
2026-06-16 CLX9872 LUX → PVG Jun 16, 21:15 UTCJun 17, 00:45 UTC3h 30m
2026-06-16 CLX46C LCK → LUX Jun 16, 08:55 UTCJun 16, 17:24 UTC8h 30m
2026-06-16 CLX46C LCK → LUX Jun 16, 05:10 UTCJun 16, 06:10 UTC1h 0m

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?
Yes. Mode-S 4D012D is currently airborne.
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 CLX91W, CLX81T, CLX56, CLX7, CLX69B.