Apparatus

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sensors Mode-S transponder

4D2100

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D2100
Octal
23220400
Decimal
5,054,720
Country
MT
Tail
9H-WMS
Type
A21N
Broadcasting now · callsign WMT1ZY · 9,550 ft
Flights observed
546
Distinct callsigns
20
Country
MT
Last broadcast
1h ago

Current position

4D2100 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4D2100 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
WZZ9596 - 6 2026-06-22
WZZ9524 - 5 2026-06-04
WZZ845 - 5 2026-06-02
WZZ6901 - 5 2026-06-23
WZZ68 Wizz Air 5 2026-06-23
WZZ6757 - 5 2026-06-01
WZZ4GN Wizz Air 5 2026-06-04
WZZ4016 - 5 2026-06-01
WZZ38WE Wizz Air 5 2026-06-01
WZZ1RQ Wizz Air 5 2026-06-01
WZZ1485 - 5 2026-06-22
WZZ13PB Wizz Air 5 2026-06-02
WMT7SR - 5 2026-07-11
WMT678 Wizz Air Malta 5 2026-05-15
WMT5PL - 5 2026-07-11
WMT3HS - 5 2026-05-15
WZZ8PP Wizz Air 4 2026-06-03
WZZ872D Wizz Air 4 2026-06-03
WZZ87 - 4 2026-06-23
WZZ8686 Wizz Air 4 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 WMT1ZY - Jul 14, 15:30 UTCJul 14, 16:00 UTC30m
2026-07-14 WMT437 - Jul 14, 12:35 UTCJul 14, 13:55 UTC1h 20m
2026-07-14 WMT694 CTA → VRN Jul 14, 10:40 UTCJul 14, 11:40 UTC1h 0m
2026-07-14 WMT5RP - Jul 14, 07:35 UTCJul 14, 09:05 UTC1h 30m
2026-07-14 WMT736 FCO → PRG Jul 14, 04:55 UTCJul 14, 06:20 UTC1h 25m
2026-07-13 WMT6969 - Jul 13, 19:55 UTCJul 13, 21:50 UTC1h 55m
2026-07-13 WMT5JC - Jul 13, 17:15 UTCJul 13, 18:50 UTC1h 35m
2026-07-13 WMT5798 - Jul 13, 13:55 UTCJul 13, 15:50 UTC1h 55m
2026-07-13 WMT2CL - Jul 13, 10:35 UTCJul 13, 12:10 UTC1h 35m
2026-07-13 WMT4180 - Jul 13, 06:40 UTCJul 13, 08:05 UTC1h 25m
2026-07-13 WMT6191 - Jul 13, 04:20 UTCJul 13, 05:40 UTC1h 20m
2026-07-12 WMT1917 - Jul 12, 21:30 UTCJul 12, 23:30 UTC2h 0m
2026-07-12 WMT467 - Jul 12, 17:45 UTCJul 12, 20:15 UTC2h 30m
2026-07-12 WMT6004 - Jul 12, 14:15 UTCJul 12, 16:20 UTC2h 5m
2026-07-12 WMT3WF - Jul 12, 11:10 UTCJul 12, 13:15 UTC2h 5m
2026-07-12 WMT4811 - Jul 12, 07:55 UTCJul 12, 09:30 UTC1h 35m
2026-07-12 WMT6JU - Jul 12, 04:25 UTCJul 12, 06:10 UTC1h 45m
2026-07-11 WMT5PL - Jul 11, 20:05 UTCJul 11, 21:20 UTC1h 15m
2026-07-11 WMT7SR MXP → BUD Jul 11, 18:15 UTCJul 11, 19:30 UTC1h 15m
2026-07-11 WMT3235 - Jul 11, 15:15 UTCJul 11, 16:55 UTC1h 40m
2026-07-11 WMT271 MXP → ALC Jul 11, 12:20 UTCJul 11, 14:10 UTC1h 50m
2026-07-11 WMT8824 - Jul 11, 07:50 UTCJul 11, 09:45 UTC1h 55m
2026-07-11 WMT7FB - Jul 11, 04:50 UTCJul 11, 06:45 UTC1h 55m
2026-07-10 WMT164 - Jul 10, 20:30 UTCJul 10, 22:05 UTC1h 36m
2026-07-10 WMT1MS MXP → LTN Jul 10, 18:00 UTCJul 10, 19:30 UTC1h 30m
2026-07-10 WMT8064 LTN → MXP Jul 10, 15:20 UTCJul 10, 16:55 UTC1h 35m
2026-07-10 WMT796 MXP → LTN Jul 10, 12:25 UTCJul 10, 14:05 UTC1h 40m
2026-07-10 WMT2HX MXP → MXP Jul 10, 03:25 UTCJul 10, 10:30 UTC7h 5m
2026-07-09 WMT5PL - Jul 9, 22:40 UTCJul 10, 00:15 UTC1h 35m
2026-07-09 WMT7SR MXP → BUD Jul 9, 20:05 UTCJul 9, 21:20 UTC1h 15m
2026-07-09 WMT3235 - Jul 9, 17:20 UTCJul 9, 19:00 UTC1h 40m
2026-07-09 WMT3235 ALC → ALC Jul 9, 15:55 UTCJul 9, 16:00 UTC5m
2026-07-09 WMT271 MXP → ALC Jul 9, 12:20 UTCJul 9, 14:10 UTC1h 50m
2026-07-09 WMT132 - Jul 9, 09:50 UTCJul 9, 10:40 UTC50m
2026-07-09 WMT1097 - Jul 9, 08:15 UTCJul 9, 08:45 UTC30m
2026-07-09 WMT642 - Jul 9, 06:30 UTCJul 9, 07:05 UTC35m
2026-07-09 WMT2328 - Jul 9, 04:40 UTCJul 9, 05:30 UTC50m
2026-07-08 WMT7359 - Jul 8, 21:30 UTCJul 8, 23:20 UTC1h 50m
2026-07-08 WMT958 MXP → MAD Jul 8, 18:15 UTCJul 8, 19:55 UTC1h 40m
2026-07-08 WMT1SU - Jul 8, 15:00 UTCJul 8, 17:10 UTC2h 10m
2026-07-08 WMT5EF - Jul 8, 11:40 UTCJul 8, 13:45 UTC2h 5m
2026-07-08 WMT3MX - Jul 8, 08:05 UTCJul 8, 09:45 UTC1h 40m
2026-07-08 WMT9D MXP → VLC Jul 8, 04:55 UTCJul 8, 06:30 UTC1h 35m
2026-07-07 WMT2MK OLB → MXP Jul 7, 21:50 UTCJul 7, 23:05 UTC1h 15m
2026-07-07 WMT44NX MXP → OLB Jul 7, 19:40 UTCJul 7, 20:40 UTC1h 0m
2026-07-07 WMT1EJ - Jul 7, 16:55 UTCJul 7, 18:30 UTC1h 35m
2026-07-07 WMT7PC MXP → VLC Jul 7, 14:10 UTCJul 7, 15:45 UTC1h 35m
2026-07-07 WMT8UN - Jul 7, 10:30 UTCJul 7, 12:30 UTC2h 0m
2026-07-07 WMT26TU - Jul 7, 06:25 UTCJul 7, 08:45 UTC2h 20m
2026-07-07 WMT59B - Jul 7, 02:50 UTCJul 7, 05:25 UTC2h 35m

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

Mode-S 4D2100 frequently asked

What is Mode-S code 4D2100?
4D2100 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-WMS.
Where is Mode-S 4D2100 registered?
Mode-S code 4D2100 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D2100 broadcasting right now?
Yes. Mode-S 4D2100 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D2100, octal 23220400, decimal 5,054,720.
What flights does 4D2100 operate?
Mode-S 4D2100 has broadcast 20 distinct callsigns, including WZZ9596, WZZ9524, WZZ845, WZZ6901, WZZ68.