sensors Mode-S transponder

4D20A2

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-ISLA · EMBRAER EMB-135 Legacy

Hex
4D20A2
Octal
23220242
Decimal
5,054,626
Country
MT
Tail
9H-ISLA
Type
E35L
No current signal · last broadcast 16h ago
Flights observed
5
Distinct callsigns
3
Country
MT
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S 4D20A2.

Country allocation

The ICAO 24-bit address 4D20A2 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 3 distinct

Callsign Airline Flights Last seen
AXY934A - 2 2026-04-14
AXY878Y - 2 2026-04-13
AXY994S - 1 2026-04-12

Recent flights last 5

DateFlightRouteTakeoffLandingDuration
2026-04-14 AXY934A - Apr 14, 09:10 UTCApr 14, 11:05 UTC1h 55m
2026-04-14 AXY934A - Apr 14, 08:20 UTCApr 14, 09:05 UTC45m
2026-04-13 AXY878Y - Apr 13, 15:50 UTCApr 13, 16:10 UTC20m
2026-04-13 AXY878Y - Apr 13, 14:25 UTCApr 13, 16:10 UTC1h 45m
2026-04-12 AXY994S - Apr 12, 17:15 UTCApr 12, 18:40 UTC1h 25m

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

Mode-S 4D20A2 frequently asked

What is Mode-S code 4D20A2?
4D20A2 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-ISLA.
Where is Mode-S 4D20A2 registered?
Mode-S code 4D20A2 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D20A2 broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D20A2, octal 23220242, decimal 5,054,626.
What flights does 4D20A2 operate?
Mode-S 4D20A2 has broadcast 3 distinct callsigns, including AXY934A, AXY878Y, AXY994S.