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sensors Mode-S transponder

4D21CE

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D21CE
Octal
23220716
Decimal
5,054,926
Country
MT
Tail
9H-FRA
Type
B738
Broadcasting now · callsign AEZ157Q · 7,275 ft
Flights observed
660
Distinct callsigns
20
Country
MT
Last broadcast
Jul 26, 20:20 UTC

Current position

4D21CE is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4D21CE 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
AEZ31TR - 16 2026-07-19
AEZ7813 Aerial Transit Company 15 2026-07-26
AEZ836S Aerial Transit Company 14 2026-07-23
AEZ2616 Aerial Transit Company 14 2026-07-26
AEZ835L - 13 2026-07-23
AEZ833J - 13 2026-07-23
AEZ7817 Aerial Transit Company 13 2026-07-26
AEZ7814 - 13 2026-07-26
AEZ569P - 13 2026-07-20
AEZ38TM - 13 2026-07-23
AEZ389L Aerial Transit Company 13 2026-07-23
AEZ318W - 13 2026-07-26
AEZ2347 Aerial Transit Company 13 2026-07-21
AEZ839Y - 12 2026-07-22
AEZ7810 Aerial Transit Company 12 2026-07-24
AEZ385Z - 12 2026-07-22
AEZ311L Aerial Transit Company 12 2026-07-24
AEZ139V Aerial Transit Company 12 2026-07-24
AEZ29JD Aerial Transit Company 11 2026-07-23
AEZ2617 - 11 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AEZ2616 OLB → FCO Jul 26, 19:55 UTCJul 26, 20:20 UTC25m
2026-07-26 AEZ7817 FCO → OLB Jul 26, 18:05 UTCJul 26, 18:40 UTC35m
2026-07-26 AEZ7814 - Jul 26, 16:00 UTCJul 26, 16:25 UTC25m
2026-07-26 AEZ7815 FCO → OLB Jul 26, 13:55 UTCJul 26, 14:40 UTC45m
2026-07-26 AEZ318W - Jul 26, 12:20 UTCJul 26, 12:45 UTC25m
2026-07-26 AEZ7813 FCO → OLB Jul 26, 10:30 UTCJul 26, 10:55 UTC25m
2026-07-26 AEZ419P PMO → FCO Jul 26, 05:25 UTCJul 26, 06:05 UTC40m
2026-07-25 AEZ146R FCO → PMO Jul 25, 19:35 UTCJul 25, 20:15 UTC40m
2026-07-25 AEZ81GR CAG → FCO Jul 25, 09:10 UTCJul 25, 09:45 UTC35m
2026-07-24 AEZ2349 FCO → CAG Jul 24, 20:20 UTCJul 24, 20:50 UTC30m
2026-07-24 AEZ70MH CAG → FCO Jul 24, 18:15 UTCJul 24, 18:55 UTC40m
2026-07-24 AEZ11LJ FCO → CAG Jul 24, 16:25 UTCJul 24, 17:05 UTC40m
2026-07-24 AEZ311L OLB → FCO Jul 24, 14:40 UTCJul 24, 15:05 UTC25m
2026-07-24 AEZ131R FCO → OLB Jul 24, 12:30 UTCJul 24, 13:00 UTC30m
2026-07-24 AEZ7812 - Jul 24, 09:35 UTCJul 24, 10:05 UTC30m
2026-07-24 AEZ139V FCO → OLB Jul 24, 07:45 UTCJul 24, 08:20 UTC35m
2026-07-24 AEZ7810 OLB → FCO Jul 24, 05:25 UTCJul 24, 05:55 UTC30m
2026-07-23 AEZ833J - Jul 23, 16:45 UTCJul 23, 17:30 UTC45m
2026-07-23 AEZ29JD OLB → LIN Jul 23, 14:35 UTCJul 23, 15:20 UTC45m
2026-07-23 AEZ835L - Jul 23, 12:00 UTCJul 23, 12:50 UTC50m
2026-07-23 AEZ38TM - Jul 23, 09:20 UTCJul 23, 10:15 UTC55m
2026-07-23 AEZ836S LIN → OLB Jul 23, 07:15 UTCJul 23, 07:55 UTC40m
2026-07-23 AEZ389L OLB → LIN Jul 23, 05:15 UTCJul 23, 06:05 UTC50m
2026-07-22 AEZ839Y - Jul 22, 19:10 UTCJul 22, 19:55 UTC45m
2026-07-22 AEZ385Z - Jul 22, 17:15 UTCJul 22, 18:00 UTC45m
2026-07-22 AEZ2631 LIN → OLB Jul 22, 14:30 UTCJul 22, 15:15 UTC45m
2026-07-22 AEZ2630 - Jul 22, 12:30 UTCJul 22, 13:15 UTC45m
2026-07-21 AEZ2348 - Jul 21, 19:55 UTCJul 21, 20:30 UTC35m
2026-07-21 AEZ2347 FCO → CAG Jul 21, 18:10 UTCJul 21, 18:40 UTC30m
2026-07-21 AEZ413P - Jul 21, 09:40 UTCJul 21, 10:25 UTC45m
2026-07-21 AEZ141W - Jul 21, 07:45 UTCJul 21, 08:25 UTC40m
2026-07-20 AEZ7816 OLB → FCO Jul 20, 18:10 UTCJul 20, 18:40 UTC30m
2026-07-20 AEZ569P - Jul 20, 16:20 UTCJul 20, 16:55 UTC35m
2026-07-20 AEZ311L OLB → FCO Jul 20, 14:20 UTCJul 20, 14:50 UTC30m
2026-07-20 AEZ131R FCO → OLB Jul 20, 12:10 UTCJul 20, 12:40 UTC30m
2026-07-20 AEZ7812 - Jul 20, 10:15 UTCJul 20, 10:50 UTC35m
2026-07-20 AEZ139V - Jul 20, 08:25 UTCJul 20, 08:45 UTC20m
2026-07-20 AEZ7810 - Jul 20, 05:20 UTCJul 20, 05:50 UTC30m
2026-07-19 AEZ2617 - Jul 19, 20:05 UTCJul 19, 20:35 UTC30m
2026-07-19 AEZ7816 OLB → FCO Jul 19, 18:30 UTCJul 19, 19:05 UTC35m
2026-07-19 AEZ7815 FCO → OLB Jul 19, 14:20 UTCJul 19, 14:50 UTC30m
2026-07-19 AEZ318W - Jul 19, 11:55 UTCJul 19, 12:25 UTC30m
2026-07-19 AEZ7813 FCO → OLB Jul 19, 09:50 UTCJul 19, 10:10 UTC20m
2026-07-19 AEZ31TR - Jul 19, 07:55 UTCJul 19, 08:20 UTC25m
2026-07-18 AEZ833J - Jul 18, 17:15 UTCJul 18, 18:10 UTC55m
2026-07-18 AEZ29JD OLB → LIN Jul 18, 14:40 UTCJul 18, 15:30 UTC50m
2026-07-18 AEZ131R FCO → OLB Jul 18, 11:35 UTCJul 18, 12:10 UTC35m
2026-07-18 AEZ31TR - Jul 18, 07:55 UTCJul 18, 08:25 UTC30m
2026-07-17 AEZ2617 - Jul 17, 20:35 UTCJul 17, 21:00 UTC25m
2026-07-17 AEZ7816 OLB → FCO Jul 17, 18:44 UTCJul 17, 19:09 UTC25m

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

Mode-S 4D21CE frequently asked

What is Mode-S code 4D21CE?
4D21CE is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-FRA.
Where is Mode-S 4D21CE registered?
Mode-S code 4D21CE is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21CE broadcasting right now?
Yes. Mode-S 4D21CE is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21CE, octal 23220716, decimal 5,054,926.
What flights does 4D21CE operate?
Mode-S 4D21CE has broadcast 20 distinct callsigns, including AEZ31TR, AEZ7813, AEZ836S, AEZ2616, AEZ835L.