sensors Mode-S transponder

4D20BD

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D20BD
Octal
23220275
Decimal
5,054,653
Country
MT
Tail
9H-WMI
Type
A21N
Broadcasting now · callsign WMT3178 · 35,975 ft
Flights observed
15
Distinct callsigns
8
Country
MT
Last broadcast
23h ago

Current position

4D20BD is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4D20BD 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 8 distinct

Callsign Airline Flights Last seen
WMT6US - 3 2026-04-13
WMT3RN - 3 2026-04-13
WMT288 - 3 2026-04-13
WMT9JE - 2 2026-04-14
WMT8NB - 1 2026-04-14
WMT8508 Wizz Air Malta 1 2026-04-13
WMT4ER - 1 2026-04-13
WMT226 - 1 2026-04-13

Recent flights last 15

DateFlightRouteTakeoffLandingDuration
2026-04-14 WMT9JE - Apr 14, 09:10 UTCApr 14, 09:35 UTC25m
2026-04-14 WMT9JE - Apr 14, 07:35 UTCApr 14, 09:05 UTC1h 30m
2026-04-14 WMT8NB - Apr 14, 05:15 UTCApr 14, 06:20 UTC1h 5m
2026-04-13 WMT288 - Apr 13, 19:50 UTCApr 13, 21:50 UTC2h 0m
2026-04-13 WMT288 - Apr 13, 19:25 UTCApr 13, 20:10 UTC45m
2026-04-13 WMT3RN - Apr 13, 16:15 UTCApr 13, 17:40 UTC1h 25m
2026-04-13 WMT3RN - Apr 13, 15:50 UTCApr 13, 17:40 UTC1h 50m
2026-04-13 WMT3RN - Apr 13, 15:30 UTCApr 13, 16:15 UTC45m
2026-04-13 WMT6US - Apr 13, 12:20 UTCApr 13, 12:40 UTC20m
2026-04-13 WMT6US - Apr 13, 11:55 UTCApr 13, 12:40 UTC45m
2026-04-13 WMT6US - Apr 13, 11:20 UTCApr 13, 12:15 UTC55m
2026-04-13 WMT8508 CDT → FCO Apr 13, 08:50 UTCApr 13, 10:05 UTC1h 15m
2026-04-13 WMT226 - Apr 13, 06:30 UTCApr 13, 07:45 UTC1h 15m
2026-04-13 WMT4ER - Apr 13, 04:20 UTCApr 13, 05:30 UTC1h 10m
2026-04-12 WMT288 - Apr 12, 17:40 UTCApr 12, 20:05 UTC2h 25m

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

Mode-S 4D20BD frequently asked

What is Mode-S code 4D20BD?
4D20BD is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-WMI.
Where is Mode-S 4D20BD registered?
Mode-S code 4D20BD is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D20BD broadcasting right now?
Yes. Mode-S 4D20BD is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D20BD, octal 23220275, decimal 5,054,653.
What flights does 4D20BD operate?
Mode-S 4D20BD has broadcast 8 distinct callsigns, including WMT6US, WMT3RN, WMT288, WMT9JE, WMT8NB.