Apparatus

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sensors Mode-S transponder

4D238B

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-LFX · EMBRAER EMB-550 Praetor 600

Hex
4D238B
Octal
23221613
Decimal
5,055,371
Country
MT
Tail
9H-LFX
Type
E550
No current signal · last broadcast 12h ago
Flights observed
9
Distinct callsigns
1
Country
MT
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S 4D238B.

Country allocation

The ICAO 24-bit address 4D238B falls within the block assigned to Malta (MT) by ICAO Annex 10, Volume III. Every aircraft registered in Malta 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 1 distinct

Callsign Airline Flights Last seen
FJO66L - 9 2026-04-14

Recent flights last 9

DateFlightRouteTakeoffLandingDuration
2026-04-14 FJO66L - Apr 14, 09:10 UTCApr 14, 10:20 UTC1h 10m
2026-04-14 FJO66L - Apr 14, 07:15 UTCApr 14, 09:05 UTC1h 50m
2026-04-13 FJO66L - Apr 13, 12:20 UTCApr 13, 12:30 UTC10m
2026-04-13 FJO66L - Apr 13, 11:55 UTCApr 13, 12:30 UTC35m
2026-04-13 FJO66L - Apr 13, 09:55 UTCApr 13, 12:15 UTC2h 20m
2026-04-13 FJO66L - Apr 13, 08:20 UTCApr 13, 08:40 UTC20m
2026-04-13 FJO66L - Apr 13, 07:55 UTCApr 13, 08:40 UTC45m
2026-04-13 FJO66L - Apr 13, 07:30 UTCApr 13, 08:15 UTC45m
2026-04-13 FJO66L ZRH → SZG Apr 13, 05:30 UTCApr 13, 06:10 UTC40m

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 9H-LFX page for operator, model, and routing details .

Mode-S 4D238B frequently asked

What is Mode-S code 4D238B?
4D238B is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-LFX.
Where is Mode-S 4D238B registered?
Mode-S code 4D238B is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D238B broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D238B, octal 23221613, decimal 5,055,371.
What flights does 4D238B operate?
Mode-S 4D238B has broadcast 1 distinct callsign, including FJO66L.