Apparatus

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sensors Mode-S transponder

4D20BF

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D20BF
Octal
23220277
Decimal
5,054,655
Country
MT
Tail
9H-WMK
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 4D20BF.

Country allocation

The ICAO 24-bit address 4D20BF 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
WMT956 Wizz Air Malta 13 2026-06-27
WMT283 Wizz Air Malta 13 2026-06-27
WMT3178 - 11 2026-06-25
WMT936 Wizz Air Malta 10 2026-06-26
WMT8LX - 10 2026-06-28
WMT376 - 10 2026-06-26
WMT8508 - 9 2026-06-26
WMT6US - 9 2026-06-26
WMT4ER - 8 2026-06-26
WMT3RN Wizz Air Malta 8 2026-06-27
WMT288 Wizz Air Malta 8 2026-06-27
WMT226 - 8 2026-06-26
WMT6002 - 7 2026-07-14
WMT5EY - 7 2026-07-14
WMT8LM - 6 2026-07-16
WMT303 - 6 2026-07-16
WMT8XY - 5 2026-05-04
WMT4DW - 5 2026-07-13
WMT463 - 5 2026-07-13
WMT2Q - 5 2026-05-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 WMT7359 - Jul 26, 21:25 UTCJul 26, 21:45 UTC20m
2026-07-26 WMT958 LTN → CLJ Jul 26, 18:20 UTCJul 26, 20:00 UTC1h 40m
2026-07-26 WMT9SX SVQ → MXP Jul 26, 15:05 UTCJul 26, 17:15 UTC2h 10m
2026-07-26 WMT8151 MXP → SVQ Jul 26, 11:20 UTCJul 26, 13:25 UTC2h 5m
2026-07-26 WZZ8TB HER → MXP Jul 26, 05:55 UTCJul 26, 08:40 UTC2h 46m
2026-07-26 WZZ354 WAW → HER Jul 26, 02:30 UTCJul 26, 04:30 UTC2h 0m
2026-07-25 WMT952 BGY → SCV Jul 25, 20:15 UTCJul 26, 00:05 UTC3h 50m
2026-07-25 WMT9YD - Jul 25, 15:20 UTCJul 25, 18:40 UTC3h 20m
2026-07-25 WMT7237 MAD → MXP Jul 25, 12:15 UTCJul 25, 13:40 UTC1h 25m
2026-07-25 WMT4407 MXP → MAD Jul 25, 08:50 UTCJul 25, 10:45 UTC1h 55m
2026-07-25 WMT9984 BUD → MXP Jul 25, 06:35 UTCJul 25, 08:00 UTC1h 25m
2026-07-25 WMT743 MXP → BUD Jul 25, 04:25 UTCJul 25, 05:45 UTC1h 20m
2026-07-24 WMT1RB - Jul 24, 18:15 UTCJul 24, 20:50 UTC2h 35m
2026-07-24 WMT8HM TIA → VRN Jul 24, 14:40 UTCJul 24, 16:40 UTC2h 0m
2026-07-24 WMT9721 BCN → MXP Jul 24, 12:00 UTCJul 24, 13:25 UTC1h 25m
2026-07-24 WMT1KS - Jul 24, 09:25 UTCJul 24, 10:45 UTC1h 20m
2026-07-24 WMT9984 BUD → MXP Jul 24, 06:35 UTCJul 24, 07:50 UTC1h 15m
2026-07-24 WMT743 MXP → BUD Jul 24, 04:20 UTCJul 24, 05:40 UTC1h 20m
2026-07-23 WMT4646 TLV → MXP Jul 23, 17:40 UTCJul 23, 21:25 UTC3h 45m
2026-07-23 WMT9BV MXP → TLV Jul 23, 03:30 UTCJul 23, 06:45 UTC3h 15m
2026-07-22 WMT1RB - Jul 22, 19:45 UTCJul 22, 22:15 UTC2h 30m
2026-07-22 WMT8HM TIA → VRN Jul 22, 16:25 UTCJul 22, 18:25 UTC2h 0m
2026-07-22 WMT3358 LMP → MXP Jul 22, 13:20 UTCJul 22, 15:10 UTC1h 50m
2026-07-22 WMT3630 - Jul 22, 11:30 UTCJul 22, 12:20 UTC50m
2026-07-22 WMT3MX - Jul 22, 11:10 UTCJul 22, 11:15 UTC5m
2026-07-22 WMT9D MXP → VLC Jul 22, 05:05 UTCJul 22, 10:25 UTC5h 20m
2026-07-21 WMT2MK - Jul 21, 21:55 UTCJul 21, 22:50 UTC55m
2026-07-21 WMT44NX - Jul 21, 19:45 UTCJul 21, 20:30 UTC45m
2026-07-21 WMT1EJ VLC → MXP Jul 21, 17:20 UTCJul 21, 18:50 UTC1h 30m
2026-07-21 WMT7PC MXP → VLC Jul 21, 14:35 UTCJul 21, 16:15 UTC1h 40m
2026-07-21 WMT515 LCA → MXP Jul 21, 08:40 UTCJul 21, 12:20 UTC3h 40m
2026-07-21 WMT6YM - Jul 21, 04:35 UTCJul 21, 07:30 UTC2h 55m
2026-07-20 WMT3235 ALC → MXP Jul 20, 16:20 UTCJul 20, 18:00 UTC1h 40m
2026-07-20 WMT271 MXP → ALC Jul 20, 13:05 UTCJul 20, 14:55 UTC1h 50m
2026-07-20 WMT132 - Jul 20, 10:00 UTCJul 20, 10:50 UTC50m
2026-07-20 WMT1097 - Jul 20, 08:10 UTCJul 20, 08:35 UTC25m
2026-07-20 WMT642 - Jul 20, 06:45 UTCJul 20, 07:15 UTC30m
2026-07-20 WMT2328 - Jul 20, 04:40 UTCJul 20, 05:30 UTC50m
2026-07-19 WMT4JM - Jul 19, 23:05 UTCJul 20, 00:30 UTC1h 25m
2026-07-19 WMT8598 - Jul 19, 19:55 UTCJul 19, 21:20 UTC1h 25m
2026-07-19 WMT3PH - Jul 19, 17:35 UTCJul 19, 18:55 UTC1h 20m
2026-07-19 WMT7YE - Jul 19, 14:40 UTCJul 19, 16:05 UTC1h 25m
2026-07-19 WMT4646 TLV → MXP Jul 19, 08:15 UTCJul 19, 12:10 UTC3h 55m
2026-07-19 WMT9BV MXP → TLV Jul 19, 03:15 UTCJul 19, 06:30 UTC3h 15m
2026-07-18 WMT5PL BUD → MXP Jul 18, 21:25 UTCJul 18, 22:55 UTC1h 30m
2026-07-18 WMT7SR MXP → BUD Jul 18, 19:15 UTCJul 18, 20:20 UTC1h 5m
2026-07-18 WMT3235 - Jul 18, 16:20 UTCJul 18, 17:50 UTC1h 30m
2026-07-18 WMT4LN - Jul 18, 12:20 UTCJul 18, 14:10 UTC1h 50m
2026-07-18 WMT6753 - Jul 18, 08:50 UTCJul 18, 11:05 UTC2h 15m
2026-07-18 WMT8JT - Jul 18, 05:05 UTCJul 18, 07:40 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-WMK page for operator, model, and routing details .

Mode-S 4D20BF frequently asked

What is Mode-S code 4D20BF?
4D20BF is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-WMK.
Where is Mode-S 4D20BF registered?
Mode-S code 4D20BF is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D20BF 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 4D20BF, octal 23220277, decimal 5,054,655.
What flights does 4D20BF operate?
Mode-S 4D20BF has broadcast 20 distinct callsigns, including WMT956, WMT283, WMT3178, WMT936, WMT8LX.