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 6h ago
Flights observed
578
Distinct callsigns
20
Country
MT
Last broadcast
6h 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
AEZ157Q Aerial Transit Company 13 2026-07-24
AEZ88LL Aerial Transit Company 12 2026-07-23
AEZ519C - 12 2026-07-24
AEZ47LG - 12 2026-07-23
AEZ2363 Aerial Transit Company 12 2026-07-23
AEZ158C - 11 2026-07-24
AEZ8094 Aerial Transit Company 10 2026-07-23
AEZ514C - 10 2026-07-19
AEZ44LG Aerial Transit Company 10 2026-07-23
AEZ419P - 10 2026-07-19
AEZ413P - 10 2026-07-19
AEZ146R - 10 2026-07-18
AEZ141W - 10 2026-07-19
AEZ60RG - 9 2026-07-11
AEZ516C - 9 2026-07-15
AEZ500Q - 9 2026-07-16
AEZ418P - 9 2026-07-18
AEZ2616 - 9 2026-07-02
AEZ145N - 9 2026-07-18
AEZ139V - 9 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 AEZ157Q FCO → CTA Jul 24, 19:50 UTCJul 24, 20:35 UTC45m
2026-07-24 AEZ519C - Jul 24, 17:30 UTCJul 24, 18:30 UTC1h 0m
2026-07-24 AEZ2824 BGY → CTA Jul 24, 14:40 UTCJul 24, 16:00 UTC1h 20m
2026-07-24 AEZ2825 CTA → BGY Jul 24, 12:10 UTCJul 24, 13:40 UTC1h 30m
2026-07-24 AEZ158C - Jul 24, 10:20 UTCJul 24, 11:00 UTC40m
2026-07-24 AEZ20GR CAG → FCO Jul 24, 05:55 UTCJul 24, 06:35 UTC40m
2026-07-23 AEZ2363 LIN → CAG Jul 23, 17:50 UTCJul 23, 18:55 UTC1h 5m
2026-07-23 AEZ14UJ CAG → LIN Jul 23, 15:35 UTCJul 23, 16:35 UTC1h 0m
2026-07-23 AEZ88LL LIN → CAG Jul 23, 13:15 UTCJul 23, 14:15 UTC1h 0m
2026-07-23 AEZ47LG - Jul 23, 10:55 UTCJul 23, 11:50 UTC55m
2026-07-23 AEZ8094 LIN → CAG Jul 23, 08:30 UTCJul 23, 09:20 UTC50m
2026-07-23 AEZ44LG CAG → LIN Jul 23, 06:20 UTCJul 23, 07:20 UTC1h 0m
2026-07-22 AEZ2363 LIN → CAG Jul 22, 18:00 UTCJul 22, 18:50 UTC50m
2026-07-22 AEZ14UJ CAG → LIN Jul 22, 15:45 UTCJul 22, 16:50 UTC1h 5m
2026-07-21 AEZ2363 LIN → CAG Jul 21, 18:00 UTCJul 21, 18:55 UTC55m
2026-07-21 AEZ14UJ - Jul 21, 15:45 UTCJul 21, 16:45 UTC1h 0m
2026-07-21 AEZ2389 - Jul 21, 11:35 UTCJul 21, 12:25 UTC50m
2026-07-21 AEZ2388 - Jul 21, 09:55 UTCJul 21, 10:40 UTC45m
2026-07-20 AEZ842V - Jul 20, 19:50 UTCJul 20, 20:45 UTC55m
2026-07-20 AEZ2364 CAG → LIN Jul 20, 17:50 UTCJul 20, 18:50 UTC1h 0m
2026-07-20 AEZ69FS - Jul 20, 15:35 UTCJul 20, 16:25 UTC50m
2026-07-20 AEZ75HH - Jul 20, 13:20 UTCJul 20, 14:25 UTC1h 5m
2026-07-20 AEZ112X - Jul 20, 10:45 UTCJul 20, 11:20 UTC35m
2026-07-20 AEZ81GR - Jul 20, 08:35 UTCJul 20, 09:20 UTC45m
2026-07-20 AEZ100N FCO → CAG Jul 20, 05:20 UTCJul 20, 05:50 UTC30m
2026-07-19 AEZ413P - Jul 19, 14:15 UTCJul 19, 14:55 UTC40m
2026-07-19 AEZ141W - Jul 19, 12:15 UTCJul 19, 12:55 UTC40m
2026-07-19 AEZ514C - Jul 19, 10:05 UTCJul 19, 11:00 UTC55m
2026-07-19 AEZ155Z - Jul 19, 07:40 UTCJul 19, 08:25 UTC45m
2026-07-19 AEZ419P - Jul 19, 05:30 UTCJul 19, 06:15 UTC45m
2026-07-18 AEZ146R FCO → PMO Jul 18, 19:30 UTCJul 18, 20:10 UTC40m
2026-07-18 AEZ418P - Jul 18, 17:15 UTCJul 18, 18:05 UTC50m
2026-07-18 AEZ145N FCO → PMO Jul 18, 14:10 UTCJul 18, 14:55 UTC45m
2026-07-18 AEZ413P - Jul 18, 09:50 UTCJul 18, 10:35 UTC45m
2026-07-18 AEZ141W - Jul 18, 08:10 UTCJul 18, 08:50 UTC40m
2026-07-18 AEZ419P - Jul 18, 05:25 UTCJul 18, 06:10 UTC45m
2026-07-17 AEZ146R - Jul 17, 20:15 UTCJul 17, 20:50 UTC35m
2026-07-17 AEZ418P - Jul 17, 18:15 UTCJul 17, 19:05 UTC50m
2026-07-17 AEZ145N - Jul 17, 16:40 UTCJul 17, 17:20 UTC40m
2026-07-17 AEZ413P - Jul 17, 14:50 UTCJul 17, 15:40 UTC50m
2026-07-17 AEZ141W - Jul 17, 13:05 UTCJul 17, 13:35 UTC30m
2026-07-17 AEZ81GR - Jul 17, 08:49 UTCJul 17, 09:25 UTC35m
2026-07-17 AEZ100N FCO → CAG Jul 17, 05:15 UTCJul 17, 05:45 UTC30m
2026-07-16 AEZ11GR - Jul 16, 11:25 UTCJul 16, 12:05 UTC40m
2026-07-16 AEZ500Q - Jul 16, 09:20 UTCJul 16, 10:00 UTC40m
2026-07-16 AEZ40GR - Jul 16, 07:10 UTCJul 16, 07:55 UTC45m
2026-07-16 AEZ100N - Jul 16, 05:05 UTCJul 16, 05:50 UTC45m
2026-07-15 AEZ7816 OLB → FCO Jul 15, 17:55 UTCJul 15, 18:30 UTC35m
2026-07-15 AEZ569P FCO → OLB Jul 15, 15:45 UTCJul 15, 16:25 UTC40m
2026-07-15 AEZ514C - Jul 15, 09:50 UTCJul 15, 10:50 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.

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 6h 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 AEZ157Q, AEZ88LL, AEZ519C, AEZ47LG, AEZ2363.