Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4D21AE

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-JEH

Hex
4D21AE
Octal
23220656
Decimal
5,054,894
Country
MT
Tail
9H-JEH
Type
GLEX
Broadcasting now · callsign 9HTIM · 7,675 ft
Flights observed
5
Distinct callsigns
1
Country
MT
Last broadcast
1h ago

Current position

4D21AE is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4D21AE 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 1 distinct

Callsign Airline Flights Last seen
9HTIM - 5 2026-06-18

Recent flights last 5

DateFlightRouteTakeoffLandingDuration
2026-06-18 9HTIM - Jun 18, 11:15 UTCJun 18, 12:35 UTC1h 20m
2026-06-12 9HTIM - Jun 12, 18:05 UTCJun 12, 18:25 UTC20m
2026-06-12 9HTIM - Jun 12, 15:40 UTCJun 12, 16:05 UTC25m
2026-06-12 9HTIM - Jun 12, 11:10 UTCJun 12, 12:30 UTC1h 20m
2026-06-11 9HTIM - Jun 11, 18:45 UTCJun 11, 19:00 UTC15m

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

Mode-S 4D21AE frequently asked

What is Mode-S code 4D21AE?
4D21AE is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-JEH.
Where is Mode-S 4D21AE registered?
Mode-S code 4D21AE is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21AE broadcasting right now?
Yes. Mode-S 4D21AE is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21AE, octal 23220656, decimal 5,054,894.
What flights does 4D21AE operate?
Mode-S 4D21AE has broadcast 1 distinct callsign, including 9HTIM.