Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4D021B

ICAO 24-bit transponder address · allocated to Luxembourg

Currently assigned to LX-HLP · AIRBUS HELICOPTERS EC-145

Hex
4D021B
Octal
23201033
Decimal
5,046,811
Country
LU
Tail
LX-HLP
Type
EC45
No current signal · last broadcast 18h ago
Flights observed
141
Distinct callsigns
2
Country
LU
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S 4D021B.

Country allocation

The ICAO 24-bit address 4D021B 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 2 distinct

Callsign Airline Flights Last seen
AIRESC2 - 110 2026-07-13
AIRESC1 - 31 2026-04-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AIRESC2 - Jul 13, 19:15 UTCJul 13, 19:55 UTC40m
2026-07-12 AIRESC2 - Jul 12, 12:25 UTCJul 12, 13:01 UTC35m
2026-07-12 AIRESC2 - Jul 12, 07:45 UTCJul 12, 07:55 UTC10m
2026-07-11 AIRESC2 - Jul 11, 15:55 UTCJul 11, 17:10 UTC1h 15m
2026-07-09 AIRESC2 - Jul 9, 05:30 UTCJul 9, 06:05 UTC35m
2026-07-08 AIRESC2 - Jul 8, 07:40 UTCJul 8, 08:20 UTC40m
2026-07-07 AIRESC2 - Jul 7, 17:35 UTCJul 7, 18:10 UTC35m
2026-07-07 AIRESC2 - Jul 7, 06:40 UTCJul 7, 07:10 UTC30m
2026-07-05 AIRESC2 - Jul 5, 16:25 UTCJul 5, 16:35 UTC10m
2026-07-05 AIRESC2 - Jul 5, 13:50 UTCJul 5, 14:35 UTC45m
2026-07-05 AIRESC2 - Jul 5, 11:35 UTCJul 5, 11:45 UTC10m
2026-07-05 AIRESC2 - Jul 5, 08:30 UTCJul 5, 10:50 UTC2h 20m
2026-07-04 AIRESC2 - Jul 4, 19:55 UTCJul 4, 20:05 UTC10m
2026-07-04 AIRESC2 - Jul 4, 18:50 UTCJul 4, 19:25 UTC35m
2026-07-02 AIRESC2 - Jul 2, 18:10 UTCJul 2, 19:45 UTC1h 35m
2026-07-02 AIRESC2 - Jul 2, 16:20 UTCJul 2, 16:30 UTC10m
2026-07-02 AIRESC2 - Jul 2, 09:05 UTCJul 2, 09:15 UTC10m
2026-07-01 AIRESC2 - Jul 1, 16:45 UTCJul 1, 18:00 UTC1h 15m
2026-06-29 AIRESC2 - Jun 29, 09:10 UTCJun 29, 09:20 UTC10m
2026-06-28 AIRESC2 - Jun 28, 18:25 UTCJun 28, 18:40 UTC15m
2026-06-28 AIRESC2 - Jun 28, 17:39 UTCJun 28, 17:55 UTC15m
2026-06-28 AIRESC2 - Jun 28, 08:00 UTCJun 28, 08:34 UTC35m
2026-06-28 AIRESC2 - Jun 28, 07:14 UTCJun 28, 07:25 UTC10m
2026-06-28 AIRESC2 - Jun 28, 05:55 UTCJun 28, 06:30 UTC35m
2026-06-27 AIRESC2 - Jun 27, 15:45 UTCJun 27, 16:14 UTC30m
2026-06-27 AIRESC2 - Jun 27, 14:29 UTCJun 27, 15:00 UTC30m
2026-06-27 AIRESC2 - Jun 27, 13:44 UTCJun 27, 13:55 UTC10m
2026-06-27 AIRESC2 - Jun 27, 06:40 UTCJun 27, 07:10 UTC30m
2026-06-25 AIRESC2 - Jun 25, 18:04 UTCJun 25, 18:39 UTC35m
2026-06-25 AIRESC2 - Jun 25, 08:09 UTCJun 25, 08:20 UTC10m
2026-06-24 AIRESC2 - Jun 24, 07:54 UTCJun 24, 09:24 UTC1h 30m
2026-06-21 AIRESC2 - Jun 21, 18:35 UTCJun 21, 19:45 UTC1h 10m
2026-06-21 AIRESC2 - Jun 21, 08:30 UTCJun 21, 09:15 UTC45m
2026-06-19 AIRESC2 - Jun 19, 13:29 UTCJun 19, 14:29 UTC1h 0m
2026-06-19 AIRESC2 - Jun 19, 11:49 UTCJun 19, 11:59 UTC10m
2026-06-17 AIRESC2 - Jun 17, 21:00 UTCJun 17, 21:40 UTC40m
2026-06-17 AIRESC2 - Jun 17, 19:50 UTCJun 17, 20:25 UTC35m
2026-06-16 AIRESC2 - Jun 16, 16:20 UTCJun 16, 17:05 UTC45m
2026-06-16 AIRESC2 - Jun 16, 08:39 UTCJun 16, 08:49 UTC10m
2026-06-16 AIRESC2 - Jun 16, 07:55 UTCJun 16, 08:05 UTC10m
2026-06-15 AIRESC2 - Jun 15, 14:20 UTCJun 15, 14:30 UTC10m
2026-06-15 AIRESC2 - Jun 15, 12:15 UTCJun 15, 13:45 UTC1h 30m
2026-06-15 AIRESC2 - Jun 15, 08:49 UTCJun 15, 09:00 UTC10m
2026-06-14 AIRESC2 - Jun 14, 18:50 UTCJun 14, 19:25 UTC35m
2026-06-13 AIRESC2 - Jun 13, 16:45 UTCJun 13, 16:55 UTC10m
2026-06-12 AIRESC2 - Jun 12, 10:25 UTCJun 12, 10:35 UTC10m
2026-06-07 AIRESC2 - Jun 7, 16:00 UTCJun 7, 16:10 UTC10m
2026-06-07 AIRESC2 - Jun 7, 14:05 UTCJun 7, 14:15 UTC10m
2026-06-06 AIRESC2 - Jun 6, 17:05 UTCJun 6, 17:15 UTC10m
2026-06-06 AIRESC2 - Jun 6, 16:04 UTCJun 6, 16:20 UTC15m

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

Mode-S 4D021B frequently asked

What is Mode-S code 4D021B?
4D021B is an ICAO 24-bit transponder address. Allocated to Luxembourg. Assigned to LX-HLP.
Where is Mode-S 4D021B registered?
Mode-S code 4D021B is allocated to Luxembourg (LU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D021B broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D021B, octal 23201033, decimal 5,046,811.
What flights does 4D021B operate?
Mode-S 4D021B has broadcast 2 distinct callsigns, including AIRESC2, AIRESC1.