Apparatus

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sensors Mode-S transponder

4D21FA

ICAO 24-bit transponder address · allocated to Malta

Hex
4D21FA
Octal
23220772
Decimal
5,054,970
Country
MT
No current signal · last broadcast Jul 26, 19:55 UTC
Flights observed
128
Distinct callsigns
20
Country
MT
Last broadcast
Jul 26, 19:55 UTC

Last known position

Most recent position reported by Mode-S 4D21FA.

Country allocation

The ICAO 24-bit address 4D21FA 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 20 distinct

Callsign Airline Flights Last seen
AEZ519C - 7 2026-07-16
AEZ158C - 7 2026-07-16
AEZ516C - 6 2026-07-17
AEZ157Q - 6 2026-07-16
AEZ88LL Aerial Transit Company 3 2026-07-21
AEZ7817 Aerial Transit Company 3 2026-07-22
AEZ514C - 3 2026-07-13
AEZ500Q - 3 2026-07-23
AEZ47LG - 3 2026-07-21
AEZ2616 - 3 2026-07-22
AEZ155Z - 3 2026-07-13
AEZ842V - 2 2026-07-21
AEZ811Z - 2 2026-07-23
AEZ8094 Aerial Transit Company 2 2026-07-20
AEZ7813 - 2 2026-07-16
AEZ7811 - 2 2026-07-16
AEZ44LG Aerial Transit Company 2 2026-07-20
AEZ41GR Aerial Transit Company 2 2026-07-23
AEZ40GR - 2 2026-07-23
AEZ31TR - 2 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AEZ839Y LIN → OLB Jul 26, 19:15 UTCJul 26, 19:55 UTC40m
2026-07-26 AEZ385Z OLB → LIN Jul 26, 17:25 UTCJul 26, 18:15 UTC50m
2026-07-26 AEZ2631 LIN → OLB Jul 26, 14:25 UTCJul 26, 15:20 UTC55m
2026-07-26 AEZ2630 - Jul 26, 12:05 UTCJul 26, 13:10 UTC1h 5m
2026-07-26 AEZ2629 LIN → OLB Jul 26, 09:25 UTCJul 26, 10:05 UTC40m
2026-07-26 AEZ2628 OLB → LIN Jul 26, 05:20 UTCJul 26, 08:15 UTC2h 56m
2026-07-25 AEZ833J - Jul 25, 16:40 UTCJul 25, 17:25 UTC45m
2026-07-25 AEZ29JD OLB → LIN Jul 25, 14:35 UTCJul 25, 15:15 UTC40m
2026-07-25 AEZ835L - Jul 25, 11:55 UTCJul 25, 12:45 UTC50m
2026-07-25 AEZ38TM OLB → LIN Jul 25, 09:35 UTCJul 25, 10:25 UTC50m
2026-07-25 AEZ836S LIN → OLB Jul 25, 07:25 UTCJul 25, 08:15 UTC50m
2026-07-25 AEZ389L OLB → LIN Jul 25, 05:25 UTCJul 25, 06:10 UTC45m
2026-07-24 AEZ2617 FCO → OLB Jul 24, 19:50 UTCJul 24, 20:20 UTC30m
2026-07-24 AEZ7816 OLB → FCO Jul 24, 17:55 UTCJul 24, 18:20 UTC25m
2026-07-24 AEZ569P FCO → OLB Jul 24, 16:00 UTCJul 24, 16:20 UTC20m
2026-07-24 AEZ2424 - Jul 24, 11:45 UTCJul 24, 12:40 UTC55m
2026-07-24 AEZ2425 FCO → GOA Jul 24, 10:25 UTCJul 24, 11:05 UTC40m
2026-07-24 AEZ217A AHO → FCO Jul 24, 07:50 UTCJul 24, 08:35 UTC45m
2026-07-24 AEZ122X - Jul 24, 06:20 UTCJul 24, 07:00 UTC40m
2026-07-23 AEZ2348 - Jul 23, 20:15 UTCJul 23, 20:50 UTC35m
2026-07-23 AEZ2347 FCO → CAG Jul 23, 18:35 UTCJul 23, 19:10 UTC35m
2026-07-23 AEZ41GR CAG → FCO Jul 23, 16:40 UTCJul 23, 17:20 UTC40m
2026-07-23 AEZ811Z - Jul 23, 14:30 UTCJul 23, 15:00 UTC30m
2026-07-23 AEZ11GR CAG → FCO Jul 23, 12:00 UTCJul 23, 12:40 UTC40m
2026-07-23 AEZ500Q - Jul 23, 10:25 UTCJul 23, 11:05 UTC40m
2026-07-23 AEZ40GR - Jul 23, 07:15 UTCJul 23, 07:55 UTC40m
2026-07-23 AEZ100N FCO → CAG Jul 23, 05:15 UTCJul 23, 05:55 UTC40m
2026-07-22 AEZ2616 - Jul 22, 19:35 UTCJul 22, 20:05 UTC30m
2026-07-22 AEZ7817 FCO → OLB Jul 22, 18:05 UTCJul 22, 18:30 UTC25m
2026-07-21 AEZ842V - Jul 21, 19:50 UTCJul 21, 20:50 UTC1h 0m
2026-07-21 AEZ2364 CAG → LIN Jul 21, 17:40 UTCJul 21, 18:40 UTC1h 0m
2026-07-21 AEZ88LL LIN → CAG Jul 21, 13:10 UTCJul 21, 14:05 UTC55m
2026-07-21 AEZ47LG - Jul 21, 10:50 UTCJul 21, 11:55 UTC1h 5m
2026-07-21 RYR4J - Jul 21, 10:05 UTCJul 21, 10:15 UTC10m
2026-07-20 AEZ2363 LIN → CAG Jul 20, 18:15 UTCJul 20, 19:20 UTC1h 5m
2026-07-20 AEZ14UJ - Jul 20, 16:00 UTCJul 20, 16:50 UTC50m
2026-07-20 AEZ88LL LIN → CAG Jul 20, 13:10 UTCJul 20, 14:05 UTC55m
2026-07-20 AEZ47LG - Jul 20, 11:05 UTCJul 20, 12:00 UTC55m
2026-07-20 AEZ8094 LIN → CAG Jul 20, 08:30 UTCJul 20, 09:25 UTC55m
2026-07-20 AEZ44LG CAG → LIN Jul 20, 06:25 UTCJul 20, 07:15 UTC50m
2026-07-19 AEZ842V - Jul 19, 20:40 UTCJul 19, 21:30 UTC50m
2026-07-19 AEZ2364 CAG → LIN Jul 19, 18:40 UTCJul 19, 19:35 UTC55m
2026-07-19 AEZ69FS - Jul 19, 16:20 UTCJul 19, 17:15 UTC55m
2026-07-19 AEZ75HH - Jul 19, 14:15 UTCJul 19, 15:10 UTC55m
2026-07-19 AEZ112X - Jul 19, 12:00 UTCJul 19, 12:35 UTC35m
2026-07-19 AEZ81GR - Jul 19, 08:50 UTCJul 19, 09:20 UTC30m
2026-07-18 AEZ2363 LIN → CAG Jul 18, 17:45 UTCJul 18, 18:45 UTC1h 0m
2026-07-18 AEZ14UJ CAG → LIN Jul 18, 15:25 UTCJul 18, 16:30 UTC1h 5m
2026-07-18 AEZ88LL LIN → CAG Jul 18, 13:05 UTCJul 18, 14:00 UTC55m
2026-07-18 AEZ47LG - Jul 18, 10:45 UTCJul 18, 11:45 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.

Mode-S 4D21FA frequently asked

What is Mode-S code 4D21FA?
4D21FA is an ICAO 24-bit transponder address. Allocated to Malta.
Where is Mode-S 4D21FA registered?
Mode-S code 4D21FA is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21FA broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21FA, octal 23220772, decimal 5,054,970.
What flights does 4D21FA operate?
Mode-S 4D21FA has broadcast 20 distinct callsigns, including AEZ519C, AEZ158C, AEZ516C, AEZ157Q, AEZ88LL.