Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4D21C9

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-HAN

Hex
4D21C9
Octal
23220711
Decimal
5,054,921
Country
MT
Tail
9H-HAN
Type
GALX
No current signal · last broadcast 1h ago
Flights observed
281
Distinct callsigns
20
Country
MT
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 4D21C9.

Country allocation

The ICAO 24-bit address 4D21C9 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
AEZ2361 Aerial Transit Company 8 2026-06-02
AEZ60RG Aerial Transit Company 7 2026-05-30
AEZ2362 Aerial Transit Company 7 2026-06-04
AEZ2360 Aerial Transit Company 7 2026-06-02
AEZ157Q Aerial Transit Company 7 2026-05-25
AEZ88LL Aerial Transit Company 6 2026-06-04
AEZ7817 Aerial Transit Company 6 2026-06-08
AEZ519C Aerial Transit Company 6 2026-05-22
AEZ49KF Aerial Transit Company 6 2026-05-29
AEZ47LG Aerial Transit Company 6 2026-06-04
AEZ2616 Aerial Transit Company 6 2026-06-08
AEZ2367 Aerial Transit Company 6 2026-05-29
AEZ2363 Aerial Transit Company 6 2026-06-04
AEZ8094 Aerial Transit Company 5 2026-06-04
AEZ7813 Aerial Transit Company 5 2026-05-27
AEZ7117 - 5 2026-05-24
AEZ516C Aerial Transit Company 5 2026-05-23
AEZ44LG Aerial Transit Company 5 2026-06-04
AEZ158C Aerial Transit Company 5 2026-05-21
AEZ839Y Aerial Transit Company 4 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-09 AEZ2347 FCO → CAG Jun 9, 20:25 UTCJun 9, 21:20 UTC55m
2026-06-09 AEZ41GR CAG → FCO Jun 9, 16:45 UTCJun 9, 17:40 UTC55m
2026-06-09 AEZ811Z - Jun 9, 13:35 UTCJun 9, 14:05 UTC30m
2026-06-09 AEZ11GR CAG → FCO Jun 9, 11:10 UTCJun 9, 11:50 UTC40m
2026-06-09 AEZ500Q FCO → CAG Jun 9, 09:20 UTCJun 9, 09:50 UTC30m
2026-06-09 AEZ40GR CAG → FCO Jun 9, 07:10 UTCJun 9, 07:55 UTC45m
2026-06-09 AEZ100N FCO → CAG Jun 9, 05:10 UTCJun 9, 05:40 UTC30m
2026-06-08 AEZ2616 OLB → FCO Jun 8, 19:40 UTCJun 8, 20:10 UTC30m
2026-06-08 AEZ7817 FCO → OLB Jun 8, 17:55 UTCJun 8, 18:25 UTC30m
2026-06-08 AEZ7814 OLB → FCO Jun 8, 16:00 UTCJun 8, 16:25 UTC25m
2026-06-08 AEZ7815 FCO → OLB Jun 8, 14:15 UTCJun 8, 14:50 UTC35m
2026-06-08 AEZ413P PMO → FCO Jun 8, 09:40 UTCJun 8, 10:35 UTC55m
2026-06-08 AEZ141W FCO → PMO Jun 8, 07:35 UTCJun 8, 08:15 UTC40m
2026-06-08 AEZ419P PMO → FCO Jun 8, 05:20 UTCJun 8, 06:05 UTC45m
2026-06-07 AEZ146R FCO → PMO Jun 7, 20:15 UTCJun 7, 20:45 UTC30m
2026-06-07 AEZ418P PMO → FCO Jun 7, 18:00 UTCJun 7, 18:50 UTC50m
2026-06-07 AEZ145N FCO → PMO Jun 7, 16:10 UTCJun 7, 16:40 UTC30m
2026-06-07 AEZ413P PMO → FCO Jun 7, 14:10 UTCJun 7, 14:55 UTC45m
2026-06-07 AEZ141W FCO → PMO Jun 7, 12:30 UTCJun 7, 13:05 UTC35m
2026-06-07 AEZ514C CTA → FCO Jun 7, 10:00 UTCJun 7, 10:55 UTC55m
2026-06-07 AEZ155Z FCO → CTA Jun 7, 07:20 UTCJun 7, 08:05 UTC45m
2026-06-07 AEZ419P PMO → FCO Jun 7, 05:15 UTCJun 7, 06:00 UTC45m
2026-06-06 AEZ146R FCO → PMO Jun 6, 19:30 UTCJun 6, 20:00 UTC30m
2026-06-06 AEZ418P PMO → FCO Jun 6, 17:24 UTCJun 6, 18:09 UTC45m
2026-06-06 AEZ145N FCO → PMO Jun 6, 14:20 UTCJun 6, 14:59 UTC40m
2026-06-06 AEZ7812 OLB → FCO Jun 6, 10:14 UTCJun 6, 10:45 UTC30m
2026-06-06 AEZ139V FCO → OLB Jun 6, 08:30 UTCJun 6, 08:45 UTC15m
2026-06-06 AEZ7810 OLB → FCO Jun 6, 05:20 UTCJun 6, 05:45 UTC25m
2026-06-05 AEZ833J LIN → OLB Jun 5, 17:00 UTCJun 5, 17:40 UTC40m
2026-06-05 AEZ29JD OLB → LIN Jun 5, 15:00 UTCJun 5, 15:45 UTC45m
2026-06-05 AEZ835L LIN → OLB Jun 5, 13:05 UTCJun 5, 13:50 UTC45m
2026-06-05 AEZ41ST CAG → LIN Jun 5, 11:00 UTCJun 5, 12:00 UTC1h 0m
2026-06-04 AEZ2363 LIN → CAG Jun 4, 17:15 UTCJun 4, 18:15 UTC1h 0m
2026-06-04 AEZ2362 CAG → LIN Jun 4, 15:10 UTCJun 4, 16:10 UTC1h 0m
2026-06-04 AEZ88LL LIN → CAG Jun 4, 12:55 UTCJun 4, 13:55 UTC1h 0m
2026-06-04 AEZ47LG CAG → LIN Jun 4, 10:45 UTCJun 4, 11:50 UTC1h 5m
2026-06-04 AEZ8094 LIN → CAG Jun 4, 08:45 UTCJun 4, 09:35 UTC50m
2026-06-04 AEZ44LG CAG → LIN Jun 4, 06:20 UTCJun 4, 07:20 UTC1h 0m
2026-06-03 AEZ2363 LIN → CAG Jun 3, 17:20 UTCJun 3, 18:05 UTC45m
2026-06-03 AEZ2362 CAG → LIN Jun 3, 15:00 UTCJun 3, 16:00 UTC1h 0m
2026-06-03 AEZ88LL LIN → CAG Jun 3, 12:55 UTCJun 3, 13:45 UTC50m
2026-06-03 AEZ47LG CAG → LIN Jun 3, 10:50 UTCJun 3, 11:50 UTC1h 0m
2026-06-03 AEZ8094 LIN → CAG Jun 3, 08:35 UTCJun 3, 09:20 UTC45m
2026-06-03 AEZ44LG CAG → LIN Jun 3, 06:35 UTCJun 3, 07:40 UTC1h 5m
2026-06-02 AEZ842V - Jun 2, 22:45 UTCJun 2, 23:35 UTC50m
2026-06-02 AEZ2364 CAG → LIN Jun 2, 20:05 UTCJun 2, 21:25 UTC1h 20m
2026-06-02 AEZ2361 LIN → CAG Jun 2, 17:55 UTCJun 2, 19:15 UTC1h 20m
2026-06-02 AEZ2360 CAG → LIN Jun 2, 15:55 UTCJun 2, 17:00 UTC1h 5m
2026-06-02 AEZ8765 LIN → CAG Jun 2, 12:50 UTCJun 2, 13:40 UTC50m
2026-06-02 AEZ38TM OLB → LIN Jun 2, 09:35 UTCJun 2, 10:20 UTC45m

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

Mode-S 4D21C9 frequently asked

What is Mode-S code 4D21C9?
4D21C9 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-HAN.
Where is Mode-S 4D21C9 registered?
Mode-S code 4D21C9 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21C9 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21C9, octal 23220711, decimal 5,054,921.
What flights does 4D21C9 operate?
Mode-S 4D21C9 has broadcast 20 distinct callsigns, including AEZ2361, AEZ60RG, AEZ2362, AEZ2360, AEZ157Q.