Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign LWG20A · 25,000 ft
Flights observed
105
Distinct callsigns
19
Country
MT
Last broadcast
3h ago

Current position

4D21D1 is currently broadcasting. Map zoomed to live position.

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 19 distinct

Callsign Airline Flights Last seen
LWG20A - 17 2026-07-02
LWG19A - 15 2026-07-01
LWG10A - 13 2026-07-05
LWG39A Luxwing 11 2026-07-05
LWG30A Luxwing 7 2026-07-02
LWG29A - 7 2026-07-03
LWG40A Luxwing 5 2026-07-03
LWG17A - 5 2026-07-03
LWG59A - 4 2026-07-01
LWG49A - 4 2026-06-22
LWG10B - 4 2026-06-25
LWG27A - 3 2026-06-29
LWG20B Luxwing 3 2026-06-25
LWG36A - 2 2026-06-28
LWG47A - 1 2026-06-19
LWG39B - 1 2026-06-25
LWG29B Luxwing 1 2026-06-06
LWG19B Luxwing 1 2026-05-27
LWG16A - 1 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-06-25 LWG20B BRS → PSA Jun 25, 15:20 UTCJun 25, 17:20 UTC2h 0m
2026-06-25 LWG39B - Jun 25, 12:04 UTCJun 25, 13:50 UTC1h 45m
2026-06-25 LWG10B - Jun 25, 07:15 UTCJun 25, 08:34 UTC1h 20m
2026-06-24 LWG20A - Jun 24, 12:34 UTCJun 24, 13:54 UTC1h 20m
2026-06-24 LWG29A PEG → LIN Jun 24, 09:29 UTCJun 24, 10:14 UTC45m
2026-06-24 LWG10A LIN → PEG Jun 24, 07:20 UTCJun 24, 08:09 UTC50m
2026-06-23 LWG30A KJK → KJK Jun 23, 15:04 UTCJun 23, 15:50 UTC45m
2026-06-23 LWG59A - Jun 23, 12:15 UTCJun 23, 13:00 UTC45m
2026-06-23 LWG40A MST → MST Jun 23, 10:49 UTCJun 23, 11:35 UTC45m
2026-06-23 LWG29A - Jun 23, 09:24 UTCJun 23, 09:49 UTC25m
2026-06-23 LWG10A PMF → LBG Jun 23, 07:15 UTCJun 23, 08:00 UTC45m
2026-06-22 LWG49A - Jun 22, 13:59 UTCJun 22, 14:55 UTC55m
2026-06-22 LWG30A KJK → KJK Jun 22, 11:00 UTCJun 22, 11:50 UTC50m
2026-06-22 LWG19A PSA → CTA Jun 22, 09:30 UTCJun 22, 10:05 UTC35m
2026-06-22 LWG20A - Jun 22, 07:34 UTCJun 22, 08:25 UTC50m
2026-06-21 LWG39A BQH → BQH Jun 21, 11:49 UTCJun 21, 13:04 UTC1h 15m
2026-06-21 LWG20A BQH → PMI Jun 21, 08:44 UTCJun 21, 10:09 UTC1h 25m
2026-06-21 LWG19A PSA → CTA Jun 21, 06:50 UTCJun 21, 07:34 UTC45m
2026-06-19 LWG47A - Jun 19, 11:49 UTCJun 19, 12:09 UTC20m
2026-06-19 LWG27A - Jun 19, 10:24 UTCJun 19, 11:04 UTC40m
2026-06-19 LWG39A BQH → BQH Jun 19, 08:44 UTCJun 19, 09:19 UTC35m
2026-06-18 LWG20A BQH → PMI Jun 18, 16:35 UTCJun 18, 18:00 UTC1h 25m
2026-06-18 LWG10A PMF → LBG Jun 18, 06:45 UTCJun 18, 08:15 UTC1h 30m
2026-06-16 LWG19A PSA → CTA Jun 16, 13:30 UTCJun 16, 15:24 UTC1h 55m
2026-06-16 LWG10A PMF → LBG Jun 16, 11:05 UTCJun 16, 12:45 UTC1h 40m
2026-06-15 LWG39A BQH → BQH Jun 15, 17:34 UTCJun 15, 18:04 UTC30m
2026-06-15 LWG20A BQH → PMI Jun 15, 14:55 UTCJun 15, 15:40 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?
Yes. Mode-S 4D21D1 is currently airborne.
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 19 distinct callsigns, including LWG20A, LWG19A, LWG10A, LWG39A, LWG30A.