Apparatus

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sensors Mode-S transponder

4D0128

ICAO 24-bit transponder address · allocated to Luxembourg

Currently assigned to LX-SCV · BOEING 747-400

Hex
4D0128
Octal
23200450
Decimal
5,046,568
Country
LU
Tail
LX-SCV
Type
B744
No current signal · last broadcast 4h ago
Flights observed
159
Distinct callsigns
20
Country
LU
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 4D0128.

Country allocation

The ICAO 24-bit address 4D0128 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
CLX8 - 14 2026-07-06
CLX65 - 9 2026-06-04
CLX7603 Cargolux 7 2026-06-03
CLX515 - 6 2026-07-08
CLX32 - 6 2026-06-21
CLX309 - 6 2026-06-27
CLX3 - 6 2026-06-25
CLX9935 - 5 2026-06-26
CLX9 - 5 2026-07-17
CLX56 - 5 2026-06-17
CLX9872 Cargolux 4 2026-04-15
CLX6 - 4 2026-06-28
CLX57R - 4 2026-07-06
CLX41U Cargolux 4 2026-04-18
CLX9932 - 3 2026-07-07
CLX9726 Cargolux 3 2026-05-30
CLX92 - 3 2026-04-27
CLX75V Cargolux 3 2026-05-29
CLX315 - 3 2026-06-07
CLX12G - 3 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CLX9 - Jul 17, 16:19 UTCJul 17, 18:00 UTC1h 40m
2026-07-16 CLX74T - Jul 16, 05:50 UTCJul 16, 13:40 UTC7h 50m
2026-07-16 CLX2 ORD → IND Jul 16, 02:15 UTCJul 16, 02:50 UTC35m
2026-07-15 CLX2 LUX → ORD Jul 15, 14:30 UTCJul 15, 22:50 UTC8h 20m
2026-07-14 CLX6232 - Jul 14, 07:40 UTCJul 14, 18:00 UTC10h 20m
2026-07-13 CLX6221 - Jul 13, 14:50 UTCJul 14, 02:05 UTC11h 15m
2026-07-12 CLX93D - Jul 12, 20:15 UTCJul 13, 04:05 UTC7h 50m
2026-07-12 CLX6696 - Jul 12, 09:50 UTCJul 12, 13:10 UTC3h 20m
2026-07-11 CLX6686 - Jul 11, 19:45 UTCJul 12, 06:40 UTC10h 55m
2026-07-08 CLX515 BUD → LUX Jul 8, 17:40 UTCJul 8, 19:05 UTC1h 25m
2026-07-08 CLX515 - Jul 8, 13:00 UTCJul 8, 14:15 UTC1h 15m
2026-07-08 CLX515 - Jul 8, 03:20 UTCJul 8, 03:35 UTC15m
2026-07-07 CLX9932 LUX → HKG Jul 7, 13:20 UTCJul 8, 00:30 UTC11h 10m
2026-07-06 CLX57R - Jul 6, 15:20 UTCJul 6, 16:45 UTC1h 25m
2026-07-06 CLX57R - Jul 6, 05:40 UTCJul 6, 13:55 UTC8h 15m
2026-07-06 CLX8 - Jul 6, 00:55 UTCJul 6, 03:10 UTC2h 15m
2026-07-05 CLX8 - Jul 5, 13:20 UTCJul 5, 22:35 UTC9h 15m
2026-07-05 CLX98V DFW → LUX Jul 5, 02:05 UTCJul 5, 10:25 UTC8h 20m
2026-07-04 CLX78Y ORD → DFW Jul 4, 21:30 UTCJul 4, 23:30 UTC2h 0m
2026-07-04 CLX78Y - Jul 4, 09:10 UTCJul 4, 17:55 UTC8h 45m
2026-07-02 CLX42 - Jul 2, 03:50 UTCJul 2, 05:10 UTC1h 20m
2026-07-01 CLX9723 - Jul 1, 06:05 UTCJul 2, 05:10 UTC23h 5m
2026-07-01 CLX9723 - Jul 1, 05:25 UTCJul 2, 04:00 UTC22h 35m
2026-06-29 CLX72W - Jun 29, 13:39 UTCJun 29, 14:29 UTC50m
2026-06-29 CLX72W ATL → STN Jun 29, 04:09 UTCJun 29, 11:25 UTC7h 15m
2026-06-28 CLX6 - Jun 28, 23:39 UTCJun 29, 01:00 UTC1h 20m
2026-06-28 CLX6 - Jun 28, 12:25 UTCJun 28, 21:55 UTC9h 30m
2026-06-27 CLX309 - Jun 27, 23:55 UTCJun 28, 04:05 UTC4h 10m
2026-06-27 CLX309 - Jun 27, 13:35 UTCJun 27, 13:49 UTC15m
2026-06-26 CLX9935 - Jun 26, 20:00 UTCJun 27, 10:29 UTC14h 30m
2026-06-25 CLX63A SEA → LUX Jun 25, 06:55 UTCJun 25, 16:24 UTC9h 30m
2026-06-25 CLX3 - Jun 25, 01:50 UTCJun 25, 03:54 UTC2h 5m
2026-06-24 CLX3 - Jun 24, 11:45 UTCJun 24, 22:45 UTC11h 0m
2026-06-21 CLX48 - Jun 21, 18:10 UTCJun 22, 07:45 UTC13h 35m
2026-06-21 CLX48 - Jun 21, 11:10 UTCJun 22, 07:45 UTC20h 35m
2026-06-21 CLX32 - Jun 21, 00:19 UTCJun 21, 18:39 UTC18h 20m
2026-06-20 CLX32 - Jun 20, 21:00 UTCJun 21, 11:30 UTC14h 30m
2026-06-20 CLX14W LAX → LUX Jun 20, 06:10 UTCJun 20, 16:24 UTC10h 15m
2026-06-19 CLX9 - Jun 19, 16:25 UTCJun 20, 03:09 UTC10h 45m
2026-06-18 CLX34P ATL → LUX Jun 18, 07:05 UTCJun 18, 14:55 UTC7h 50m
2026-06-18 CLX6 - Jun 18, 03:10 UTCJun 18, 04:40 UTC1h 30m
2026-06-17 CLX6 - Jun 17, 15:05 UTCJun 18, 00:40 UTC9h 35m
2026-06-17 CLX56 STN → LUX Jun 17, 10:20 UTCJun 17, 11:10 UTC50m
2026-06-17 CLX56 - Jun 17, 03:50 UTCJun 17, 08:50 UTC5h 0m
2026-06-16 CLX9722 LUX → CGO Jun 16, 06:04 UTCJun 17, 05:05 UTC23h 1m
2026-06-16 CLX9722 LUX → CGO Jun 16, 05:10 UTCJun 17, 04:00 UTC22h 51m
2026-06-15 CLX7957 HKG → GYD Jun 15, 10:20 UTCJun 15, 22:00 UTC11h 40m
2026-06-15 CLX7957 HKG → GYD Jun 15, 05:10 UTCJun 15, 05:30 UTC20m
2026-06-14 CLX7956 HAN → HKG Jun 14, 14:30 UTCJun 14, 15:00 UTC30m
2026-06-14 CLX7956 HAN → HKG Jun 14, 13:30 UTCJun 14, 13:50 UTC20m

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

Mode-S 4D0128 frequently asked

What is Mode-S code 4D0128?
4D0128 is an ICAO 24-bit transponder address. Allocated to Luxembourg. Assigned to LX-SCV.
Where is Mode-S 4D0128 registered?
Mode-S code 4D0128 is allocated to Luxembourg (LU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D0128 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D0128, octal 23200450, decimal 5,046,568.
What flights does 4D0128 operate?
Mode-S 4D0128 has broadcast 20 distinct callsigns, including CLX8, CLX65, CLX7603, CLX515, CLX32.