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
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
610
Distinct callsigns
20
Country
MT
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S 4D2100.

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
WMT5JC - 7 2026-07-26
WZZ9596 - 6 2026-06-22
WMT6969 - 6 2026-07-26
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 WMT3ZJ BLQ → RMO Jul 26, 20:05 UTCJul 26, 21:45 UTC1h 40m
2026-07-26 WMT6969 - Jul 26, 16:25 UTCJul 26, 18:20 UTC1h 55m
2026-07-26 WMT5JC - Jul 26, 13:40 UTCJul 26, 15:10 UTC1h 30m
2026-07-26 WMT7AB BCN → RMO Jul 26, 04:05 UTCJul 26, 11:35 UTC7h 31m
2026-07-25 WMT6969 - Jul 25, 20:25 UTCJul 25, 22:20 UTC1h 55m
2026-07-25 WMT5JC - Jul 25, 17:15 UTCJul 25, 18:55 UTC1h 40m
2026-07-25 WMT7653 - Jul 25, 14:05 UTCJul 25, 15:55 UTC1h 50m
2026-07-25 WMT1400 - Jul 25, 10:05 UTCJul 25, 12:30 UTC2h 25m
2026-07-25 WMT387 - Jul 25, 06:35 UTCJul 25, 08:25 UTC1h 50m
2026-07-25 WMT5JY - Jul 25, 03:30 UTCJul 25, 05:15 UTC1h 45m
2026-07-24 WMT49BD MAD → FCO Jul 24, 23:05 UTCJul 25, 00:40 UTC1h 35m
2026-07-24 WMT8960 - Jul 24, 19:10 UTCJul 24, 21:25 UTC2h 15m
2026-07-24 WMT2283 - Jul 24, 16:05 UTCJul 24, 17:40 UTC1h 35m
2026-07-24 WMT4LN - Jul 24, 12:40 UTCJul 24, 14:30 UTC1h 50m
2026-07-24 WMT6753 - Jul 24, 08:20 UTCJul 24, 10:35 UTC2h 15m
2026-07-24 WMT8JT - Jul 24, 04:40 UTCJul 24, 07:15 UTC2h 35m
2026-07-23 WMT6969 - Jul 23, 19:50 UTCJul 23, 21:50 UTC2h 0m
2026-07-23 WMT5JC - Jul 23, 17:05 UTCJul 23, 18:40 UTC1h 35m
2026-07-23 WMT4PX - Jul 23, 14:45 UTCJul 23, 15:40 UTC55m
2026-07-23 WMT8CQ FCO → SJJ Jul 23, 12:50 UTCJul 23, 13:35 UTC45m
2026-07-23 WMT68LU - Jul 23, 08:50 UTCJul 23, 10:55 UTC2h 5m
2026-07-23 WMT1BH - Jul 23, 05:20 UTCJul 23, 07:50 UTC2h 30m
2026-07-22 WMT9706 - Jul 22, 23:35 UTCJul 23, 00:45 UTC1h 10m
2026-07-22 WMT5089 - Jul 22, 21:25 UTCJul 22, 22:40 UTC1h 15m
2026-07-22 WMT6ZK - Jul 22, 18:30 UTCJul 22, 19:45 UTC1h 15m
2026-07-22 WMT3EC LTN → OTP Jul 22, 16:20 UTCJul 22, 17:35 UTC1h 15m
2026-07-22 WMT6096 - Jul 22, 11:10 UTCJul 22, 12:55 UTC1h 45m
2026-07-21 WMT5JC - Jul 21, 17:55 UTCJul 21, 19:30 UTC1h 35m
2026-07-21 WMT7653 - Jul 21, 14:30 UTCJul 21, 16:25 UTC1h 55m
2026-07-21 WMT1400 - Jul 21, 10:20 UTCJul 21, 12:40 UTC2h 20m
2026-07-21 WMT387 - Jul 21, 06:30 UTCJul 21, 08:35 UTC2h 5m
2026-07-21 WMT5JY - Jul 21, 03:40 UTCJul 21, 05:15 UTC1h 35m
2026-07-20 WMT9059 JMK → FCO Jul 20, 21:50 UTCJul 20, 23:40 UTC1h 50m
2026-07-20 WMT3ZJ - Jul 20, 19:00 UTCJul 20, 20:40 UTC1h 40m
2026-07-20 WMT39FA - Jul 20, 15:35 UTCJul 20, 17:10 UTC1h 35m
2026-07-20 WMT8917 FCO → VLC Jul 20, 11:45 UTCJul 20, 13:30 UTC1h 45m
2026-07-20 WMT7474 - Jul 20, 08:35 UTCJul 20, 09:55 UTC1h 20m
2026-07-20 WMT2977 - Jul 20, 05:40 UTCJul 20, 07:10 UTC1h 30m
2026-07-19 WMT2257 - Jul 19, 19:10 UTCJul 19, 21:00 UTC1h 50m
2026-07-19 WMT1ZY - Jul 19, 15:35 UTCJul 19, 17:45 UTC2h 10m
2026-07-19 WMT8VQ - Jul 19, 10:05 UTCJul 19, 12:00 UTC1h 55m
2026-07-19 WMT1WA - Jul 19, 06:30 UTCJul 19, 08:55 UTC2h 25m
2026-07-18 WMT7KN TLV → FCO Jul 18, 17:45 UTCJul 18, 20:55 UTC3h 10m
2026-07-18 WMT4WZ - Jul 18, 13:25 UTCJul 18, 16:15 UTC2h 50m
2026-07-18 WMT829 - Jul 18, 08:55 UTCJul 18, 11:30 UTC2h 35m
2026-07-18 WMT4169 - Jul 18, 04:40 UTCJul 18, 07:30 UTC2h 50m
2026-07-17 WMT303 - Jul 17, 22:20 UTCJul 18, 00:19 UTC2h 0m
2026-07-17 WMT8LM - Jul 17, 18:55 UTCJul 17, 21:15 UTC2h 20m
2026-07-17 WMT6004 - Jul 17, 15:20 UTCJul 17, 17:30 UTC2h 10m
2026-07-17 WMT3WF - Jul 17, 12:10 UTCJul 17, 14:10 UTC2h 0m

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?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
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 WMT5JC, WZZ9596, WMT6969, WZZ9524, WZZ845.