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sensors Mode-S transponder

4D2101

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-WMT · AIRBUS A-321neo

Hex
4D2101
Octal
23220401
Decimal
5,054,721
Country
MT
Tail
9H-WMT
Type
A21N
No current signal · last broadcast 1h ago
Flights observed
568
Distinct callsigns
20
Country
MT
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 4D2101.

Country allocation

The ICAO 24-bit address 4D2101 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
WMT6WW - 8 2026-07-09
WMT678 - 8 2026-07-12
WMT6767 - 8 2026-07-09
WMT649 - 8 2026-07-09
WMT4763 - 8 2026-07-13
WMT3HS - 8 2026-07-12
WMT3245 - 8 2026-07-09
WMT314 Wizz Air Malta 8 2026-07-13
WZZ9EG Wizz Air 5 2026-04-26
WZZ971 Wizz Air 5 2026-04-26
WZZ9596 - 5 2026-05-14
WZZ8AZ Wizz Air 5 2026-04-26
WZZ629 Wizz Air 5 2026-04-27
WZZ4ZP Wizz Air 5 2026-04-26
WZZ2550 - 5 2026-04-27
WZZ1485 - 5 2026-05-15
WZZ10JY Wizz Air 5 2026-04-27
WMT906 - 5 2026-07-12
WMT5454 - 5 2026-07-11
WZZ9NL Wizz Air 4 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 WMT4902 MXP → TGD Jul 14, 15:30 UTCJul 14, 16:15 UTC45m
2026-07-14 WMT3502 LTN → TSR Jul 14, 13:20 UTCJul 14, 14:20 UTC1h 0m
2026-07-14 WMT7286 LCA → VCE Jul 14, 08:50 UTCJul 14, 12:10 UTC3h 20m
2026-07-14 WMT676 - Jul 14, 04:00 UTCJul 14, 06:40 UTC2h 40m
2026-07-13 WMT2WP - Jul 13, 21:15 UTCJul 13, 23:20 UTC2h 5m
2026-07-13 WMT585 - Jul 13, 17:00 UTCJul 13, 19:40 UTC2h 40m
2026-07-13 WMT314 CLJ → RAK Jul 13, 13:40 UTCJul 13, 15:50 UTC2h 10m
2026-07-13 WMT4763 - Jul 13, 10:55 UTCJul 13, 12:35 UTC1h 40m
2026-07-13 WMT8CK - Jul 13, 07:10 UTCJul 13, 08:55 UTC1h 45m
2026-07-13 WMT2JG VCE → VLC Jul 13, 04:05 UTCJul 13, 06:01 UTC1h 55m
2026-07-12 WMT2WP - Jul 12, 20:05 UTCJul 12, 22:15 UTC2h 10m
2026-07-12 WMT585 - Jul 12, 16:25 UTCJul 12, 19:01 UTC2h 35m
2026-07-12 WMT678 - Jul 12, 12:05 UTCJul 12, 13:30 UTC1h 25m
2026-07-12 WMT3HS - Jul 12, 09:40 UTCJul 12, 10:55 UTC1h 15m
2026-07-12 WMT906 - Jul 12, 06:55 UTCJul 12, 08:20 UTC1h 25m
2026-07-12 WMT769 - Jul 12, 04:20 UTCJul 12, 05:55 UTC1h 35m
2026-07-11 WMT623 - Jul 11, 18:45 UTCJul 11, 22:25 UTC3h 40m
2026-07-11 WMT5454 - Jul 11, 17:40 UTCJul 11, 17:50 UTC10m
2026-07-11 WMT5454 - Jul 11, 14:55 UTCJul 11, 16:45 UTC1h 50m
2026-07-11 WMT678 - Jul 11, 12:10 UTCJul 11, 13:30 UTC1h 20m
2026-07-11 WMT3HS - Jul 11, 09:35 UTCJul 11, 10:55 UTC1h 20m
2026-07-11 WMT4793 - Jul 11, 06:55 UTCJul 11, 08:30 UTC1h 35m
2026-07-11 WMT8XC - Jul 11, 04:25 UTCJul 11, 05:55 UTC1h 30m
2026-07-10 WMT4493 BCN → VCE Jul 10, 22:05 UTCJul 10, 23:25 UTC1h 20m
2026-07-10 WMT1LN VCE → BCN Jul 10, 19:15 UTCJul 10, 20:50 UTC1h 35m
2026-07-10 WMT224 BUD → VCE Jul 10, 16:05 UTCJul 10, 17:10 UTC1h 5m
2026-07-10 WMT136 - Jul 10, 14:10 UTCJul 10, 15:05 UTC55m
2026-07-10 WMT2AB AHO → VCE Jul 10, 11:45 UTCJul 10, 13:00 UTC1h 15m
2026-07-10 WMT2ZX - Jul 10, 09:55 UTCJul 10, 11:00 UTC1h 5m
2026-07-10 WMT30CT - Jul 10, 07:05 UTCJul 10, 08:55 UTC1h 50m
2026-07-10 WMT13EP - Jul 10, 04:15 UTCJul 10, 06:00 UTC1h 45m
2026-07-09 WMT6767 - Jul 9, 20:35 UTCJul 9, 22:10 UTC1h 35m
2026-07-09 WMT6WW VCE → LTN Jul 9, 17:35 UTCJul 9, 19:35 UTC2h 0m
2026-07-09 WMT943 - Jul 9, 15:30 UTCJul 9, 16:20 UTC50m
2026-07-09 WMT9ZH - Jul 9, 13:20 UTCJul 9, 14:15 UTC55m
2026-07-09 WMT3245 - Jul 9, 07:45 UTCJul 9, 09:45 UTC2h 0m
2026-07-09 WMT649 VCE → MAD Jul 9, 04:10 UTCJul 9, 06:10 UTC2h 0m
2026-07-08 WMT2WP - Jul 8, 21:05 UTCJul 8, 23:25 UTC2h 20m
2026-07-08 WMT585 - Jul 8, 17:45 UTCJul 8, 20:10 UTC2h 25m
2026-07-08 WMT943 - Jul 8, 15:25 UTCJul 8, 16:10 UTC45m
2026-07-08 WMT9ZH - Jul 8, 13:15 UTCJul 8, 14:15 UTC1h 0m
2026-07-08 WMT2AB - Jul 8, 11:05 UTCJul 8, 12:05 UTC1h 0m
2026-07-08 WMT2ZX - Jul 8, 09:05 UTCJul 8, 10:10 UTC1h 5m
2026-07-08 WMT5B - Jul 8, 06:40 UTCJul 8, 08:05 UTC1h 25m
2026-07-08 WMT14KD - Jul 8, 04:15 UTCJul 8, 05:25 UTC1h 10m
2026-07-07 WMT623 - Jul 7, 19:05 UTCJul 7, 22:20 UTC3h 15m
2026-07-07 WMT5454 - Jul 7, 18:00 UTCJul 7, 18:05 UTC5m
2026-07-07 WMT5454 - Jul 7, 15:10 UTCJul 7, 17:10 UTC2h 0m
2026-07-07 WMT678 PMO → VCE Jul 7, 13:00 UTCJul 7, 14:15 UTC1h 15m
2026-07-07 WMT3HS - Jul 7, 09:55 UTCJul 7, 11:10 UTC1h 15m

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

Mode-S 4D2101 frequently asked

What is Mode-S code 4D2101?
4D2101 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-WMT.
Where is Mode-S 4D2101 registered?
Mode-S code 4D2101 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D2101 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D2101, octal 23220401, decimal 5,054,721.
What flights does 4D2101 operate?
Mode-S 4D2101 has broadcast 20 distinct callsigns, including WMT6WW, WMT678, WMT6767, WMT649, WMT4763.