Apparatus

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sensors Mode-S transponder

4D21D2

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-GFP · BOEING 737-800

Hex
4D21D2
Octal
23220722
Decimal
5,054,930
Country
MT
Tail
9H-GFP
Type
B738
No current signal · last broadcast 7h ago
Flights observed
309
Distinct callsigns
20
Country
MT
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 4D21D2.

Country allocation

The ICAO 24-bit address 4D21D2 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
AEZ836S Aerial Transit Company 13 2026-05-21
AEZ389L Aerial Transit Company 12 2026-05-21
AEZ29JD Aerial Transit Company 12 2026-05-28
AEZ835L Aerial Transit Company 11 2026-05-28
AEZ833J - 11 2026-05-28
AEZ7814 Aerial Transit Company 10 2026-05-29
AEZ569P Aerial Transit Company 10 2026-05-29
AEZ839Y Aerial Transit Company 9 2026-05-19
AEZ38TM Aerial Transit Company 9 2026-05-21
AEZ385Z Aerial Transit Company 9 2026-05-19
AEZ7813 Aerial Transit Company 8 2026-05-29
AEZ418P Aerial Transit Company 8 2026-05-12
AEZ318W Aerial Transit Company 8 2026-05-29
AEZ2617 Aerial Transit Company 8 2026-05-20
AEZ2616 Aerial Transit Company 8 2026-05-20
AEZ139V Aerial Transit Company 8 2026-05-29
AEZ419P Aerial Transit Company 7 2026-05-26
AEZ413P Aerial Transit Company 7 2026-05-26
AEZ146R Aerial Transit Company 7 2026-05-12
AEZ145N Aerial Transit Company 7 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 AEZ2349 FCO → CAG May 29, 22:20 UTCMay 29, 22:50 UTC30m
2026-05-29 AEZ70MH CAG → FCO May 29, 20:50 UTCMay 29, 21:30 UTC40m
2026-05-29 AEZ11LJ FCO → CAG May 29, 18:35 UTCMay 29, 19:05 UTC30m
2026-05-29 AEZ7814 OLB → FCO May 29, 16:40 UTCMay 29, 17:10 UTC30m
2026-05-29 AEZ569P FCO → OLB May 29, 14:35 UTCMay 29, 14:55 UTC20m
2026-05-29 AEZ318W OLB → FCO May 29, 12:00 UTCMay 29, 12:35 UTC35m
2026-05-29 AEZ7813 FCO → OLB May 29, 10:05 UTCMay 29, 10:40 UTC35m
2026-05-29 AEZ31TR OLB → FCO May 29, 07:55 UTCMay 29, 08:15 UTC20m
2026-05-29 AEZ139V FCO → OLB May 29, 06:00 UTCMay 29, 06:20 UTC20m
2026-05-29 AEZ7810 OLB → FCO May 29, 04:20 UTCMay 29, 04:45 UTC25m
2026-05-28 AEZ833J - May 28, 20:30 UTCMay 28, 21:20 UTC50m
2026-05-28 AEZ833J LIN → LIN May 28, 15:45 UTCMay 28, 16:25 UTC40m
2026-05-28 AEZ29JD OLB → LIN May 28, 13:20 UTCMay 28, 14:15 UTC55m
2026-05-28 AEZ835L LIN → OLB May 28, 11:10 UTCMay 28, 12:00 UTC50m
2026-05-28 AEZ41ST CAG → LIN May 28, 08:50 UTCMay 28, 09:45 UTC55m
2026-05-28 AEZ8041 LIN → CAG May 28, 06:30 UTCMay 28, 07:20 UTC50m
2026-05-28 AEZ48LG CAG → LIN May 28, 04:30 UTCMay 28, 05:25 UTC55m
2026-05-27 AEZ2347 FCO → CAG May 27, 19:15 UTCMay 27, 19:40 UTC25m
2026-05-27 AEZ7814 OLB → FCO May 27, 15:45 UTCMay 27, 16:10 UTC25m
2026-05-27 AEZ569P FCO → OLB May 27, 14:00 UTCMay 27, 14:35 UTC35m
2026-05-27 AEZ60RG CAG → FCO May 27, 11:20 UTCMay 27, 11:55 UTC35m
2026-05-27 AEZ7117 - May 27, 09:35 UTCMay 27, 10:00 UTC25m
2026-05-27 AEZ20GR CAG → FCO May 27, 07:35 UTCMay 27, 08:15 UTC40m
2026-05-26 AEZ2347 FCO → CAG May 26, 19:15 UTCMay 26, 19:40 UTC25m
2026-05-26 AEZ7814 OLB → FCO May 26, 14:50 UTCMay 26, 15:29 UTC40m
2026-05-26 AEZ569P FCO → OLB May 26, 12:50 UTCMay 26, 13:10 UTC20m
2026-05-26 AEZ413P PMO → FCO May 26, 09:35 UTCMay 26, 10:14 UTC40m
2026-05-26 AEZ141W FCO → PMO May 26, 07:49 UTCMay 26, 08:30 UTC40m
2026-05-26 AEZ419P PMO → FCO May 26, 05:30 UTCMay 26, 06:20 UTC50m
2026-05-25 AEZ145N FCO → PMO May 25, 14:25 UTCMay 25, 14:55 UTC30m
2026-05-25 AEZ514C CTA → FCO May 25, 10:15 UTCMay 25, 11:10 UTC55m
2026-05-25 AEZ155Z FCO → CTA May 25, 08:00 UTCMay 25, 08:50 UTC50m
2026-05-25 AEZ516C CTA → FCO May 25, 05:10 UTCMay 25, 06:05 UTC55m
2026-05-24 AEZ157Q FCO → CTA May 24, 19:50 UTCMay 24, 20:35 UTC45m
2026-05-24 AEZ519C CTA → FCO May 24, 17:25 UTCMay 24, 18:20 UTC55m
2026-05-24 AEZ2824 BGY → CTA May 24, 14:35 UTCMay 24, 16:00 UTC1h 25m
2026-05-24 AEZ2825 CTA → BGY May 24, 11:55 UTCMay 24, 13:20 UTC1h 25m
2026-05-23 AEZ157Q FCO → CTA May 23, 20:10 UTCMay 23, 20:55 UTC45m
2026-05-23 AEZ519C CTA → FCO May 23, 18:10 UTCMay 23, 19:05 UTC55m
2026-05-23 AEZ158C FCO → CTA May 23, 14:15 UTCMay 23, 15:05 UTC50m
2026-05-23 AEZ60RG CAG → FCO May 23, 09:35 UTCMay 23, 10:15 UTC40m
2026-05-23 AEZ8041 LIN → CAG May 23, 06:25 UTCMay 23, 07:15 UTC50m
2026-05-23 AEZ48LG CAG → LIN May 23, 04:15 UTCMay 23, 05:15 UTC1h 0m
2026-05-22 AEZ2367 LIN → CAG May 22, 20:50 UTCMay 22, 21:40 UTC50m
2026-05-22 AEZ49KF CAG → LIN May 22, 18:35 UTCMay 22, 19:30 UTC55m
2026-05-22 AEZ2361 LIN → CAG May 22, 16:15 UTCMay 22, 17:00 UTC45m
2026-05-22 AEZ2360 CAG → LIN May 22, 14:00 UTCMay 22, 14:55 UTC55m
2026-05-22 AEZ8765 LIN → CAG May 22, 11:15 UTCMay 22, 12:00 UTC45m
2026-05-22 AEZ41ST CAG → LIN May 22, 08:45 UTCMay 22, 09:40 UTC55m
2026-05-22 AEZ8041 LIN → CAG May 22, 06:30 UTCMay 22, 07:20 UTC50m

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

Mode-S 4D21D2 frequently asked

What is Mode-S code 4D21D2?
4D21D2 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-GFP.
Where is Mode-S 4D21D2 registered?
Mode-S code 4D21D2 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21D2 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21D2, octal 23220722, decimal 5,054,930.
What flights does 4D21D2 operate?
Mode-S 4D21D2 has broadcast 20 distinct callsigns, including AEZ836S, AEZ389L, AEZ29JD, AEZ835L, AEZ833J.