Apparatus

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sensors Mode-S transponder

4D21D1

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-GAX

Hex
4D21D1
Octal
23220721
Decimal
5,054,929
Country
MT
Tail
9H-GAX
Type
B738
No current signal · last broadcast 25d ago
Flights observed
132
Distinct callsigns
20
Country
MT
Last broadcast
25d ago

Last known position

Most recent position reported by Mode-S 4D21D1.

Country allocation

The ICAO 24-bit address 4D21D1 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
LWG20A - 23 2026-07-20
LWG19A Luxwing 20 2026-07-25
LWG10A - 15 2026-07-19
LWG39A Luxwing 13 2026-07-13
LWG30A Luxwing 11 2026-07-18
LWG29A - 9 2026-07-14
LWG17A - 7 2026-07-16
LWG49A - 5 2026-07-15
LWG40A Luxwing 5 2026-07-03
LWG59A - 4 2026-07-01
LWG27A - 4 2026-07-10
LWG10B - 4 2026-06-25
LWG36A - 3 2026-07-10
LWG20B Luxwing 3 2026-06-25
LWG47A - 1 2026-06-19
LWG39B - 1 2026-06-25
LWG29B Luxwing 1 2026-06-06
LWG26A - 1 2026-07-16
LWG19B Luxwing 1 2026-05-27
LWG16A - 1 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 LWG19A PSA → CTA Jul 25, 10:50 UTCJul 25, 11:35 UTC45m
2026-07-20 LWG20A - Jul 20, 14:10 UTCJul 20, 15:20 UTC1h 10m
2026-07-20 LWG19A LIN → CIA Jul 20, 11:45 UTCJul 20, 12:35 UTC50m
2026-07-19 LWG10A - Jul 19, 17:05 UTCJul 19, 17:55 UTC50m
2026-07-18 LWG20A - Jul 18, 17:20 UTCJul 18, 18:05 UTC45m
2026-07-18 LWG19A - Jul 18, 16:00 UTCJul 18, 16:25 UTC25m
2026-07-18 LWG30A KJK → KJK Jul 18, 09:00 UTCJul 18, 09:30 UTC30m
2026-07-16 LWG17A - Jul 16, 17:35 UTCJul 16, 18:40 UTC1h 5m
2026-07-16 LWG26A - Jul 16, 13:05 UTCJul 16, 14:05 UTC1h 0m
2026-07-15 LWG20A - Jul 15, 15:35 UTCJul 15, 16:25 UTC50m
2026-07-15 LWG49A - Jul 15, 14:00 UTCJul 15, 15:00 UTC1h 0m
2026-07-15 LWG30A KJK → KJK Jul 15, 12:15 UTCJul 15, 13:00 UTC45m
2026-07-15 LWG17A - Jul 15, 06:50 UTCJul 15, 07:50 UTC1h 0m
2026-07-14 LWG29A - Jul 14, 08:30 UTCJul 14, 09:15 UTC45m
2026-07-14 LWG10A - Jul 14, 06:25 UTCJul 14, 07:30 UTC1h 5m
2026-07-13 LWG39A BQH → BQH Jul 13, 12:35 UTCJul 13, 13:45 UTC1h 10m
2026-07-13 LWG30A KJK → KJK Jul 13, 10:15 UTCJul 13, 10:55 UTC40m
2026-07-13 LWG29A - Jul 13, 07:25 UTCJul 13, 08:30 UTC1h 5m
2026-07-10 LWG36A FOG → BLQ Jul 10, 10:55 UTCJul 10, 11:55 UTC1h 0m
2026-07-10 LWG27A - Jul 10, 08:55 UTCJul 10, 09:50 UTC55m
2026-07-09 LWG39A BQH → BQH Jul 9, 19:05 UTCJul 9, 19:55 UTC50m
2026-07-09 LWG20A BLQ → OLB Jul 9, 17:20 UTCJul 9, 18:15 UTC55m
2026-07-09 LWG19A - Jul 9, 14:25 UTCJul 9, 14:55 UTC30m
2026-07-08 LWG30A KJK → KJK Jul 8, 19:50 UTCJul 8, 20:40 UTC50m
2026-07-08 LWG20A - Jul 8, 13:30 UTCJul 8, 14:15 UTC45m
2026-07-08 LWG19A - Jul 8, 12:10 UTCJul 8, 12:30 UTC20m
2026-07-05 LWG20A GRS → LIN Jul 5, 15:30 UTCJul 5, 16:15 UTC45m
2026-07-05 LWG39A BQH → BQH Jul 5, 11:30 UTCJul 5, 12:10 UTC40m
2026-07-05 LWG10A - Jul 5, 09:10 UTCJul 5, 09:55 UTC45m
2026-07-03 LWG40A MST → MST Jul 3, 15:30 UTCJul 3, 16:40 UTC1h 10m
2026-07-03 LWG39A BQH → BQH Jul 3, 12:20 UTCJul 3, 13:30 UTC1h 10m
2026-07-03 LWG17A - Jul 3, 10:10 UTCJul 3, 10:55 UTC45m
2026-07-03 LWG29A - Jul 3, 08:25 UTCJul 3, 09:05 UTC40m
2026-07-02 LWG30A KJK → KJK Jul 2, 16:35 UTCJul 2, 17:50 UTC1h 15m
2026-07-02 LWG20A - Jul 2, 06:51 UTCJul 2, 08:25 UTC1h 34m
2026-07-01 LWG19A - Jul 1, 18:10 UTCJul 1, 18:40 UTC30m
2026-07-01 LWG20A - Jul 1, 16:20 UTCJul 1, 17:25 UTC1h 5m
2026-07-01 LWG59A - Jul 1, 13:20 UTCJul 1, 13:50 UTC30m
2026-07-01 LWG30A KJK → KJK Jul 1, 11:30 UTCJul 1, 12:15 UTC45m
2026-07-01 LWG19A - Jul 1, 09:55 UTCJul 1, 10:40 UTC45m
2026-06-30 LWG40A MST → MST Jun 30, 11:30 UTCJun 30, 12:15 UTC45m
2026-06-30 LWG39A BQH → BQH Jun 30, 10:35 UTCJun 30, 11:05 UTC30m
2026-06-30 LWG20A - Jun 30, 08:40 UTCJun 30, 09:50 UTC1h 10m
2026-06-30 LWG19A - Jun 30, 06:00 UTCJun 30, 06:50 UTC50m
2026-06-29 LWG27A - Jun 29, 09:44 UTCJun 29, 10:55 UTC1h 10m
2026-06-28 LWG36A - Jun 28, 13:04 UTCJun 28, 14:14 UTC1h 10m
2026-06-28 LWG20A MRS → MXP Jun 28, 08:44 UTCJun 28, 09:39 UTC55m
2026-06-28 LWG19A - Jun 28, 06:20 UTCJun 28, 07:20 UTC1h 0m
2026-06-26 LWG17A - Jun 26, 08:45 UTCJun 26, 09:35 UTC50m
2026-06-26 LWG29A NCE → BLQ Jun 26, 06:45 UTCJun 26, 07:30 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-GAX page for operator, model, and routing details .

Mode-S 4D21D1 frequently asked

What is Mode-S code 4D21D1?
4D21D1 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-GAX.
Where is Mode-S 4D21D1 registered?
Mode-S code 4D21D1 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21D1 broadcasting right now?
No active broadcast right now. Last signal was 25d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21D1, octal 23220721, decimal 5,054,929.
What flights does 4D21D1 operate?
Mode-S 4D21D1 has broadcast 20 distinct callsigns, including LWG20A, LWG19A, LWG10A, LWG39A, LWG30A.