sensors Mode-S transponder

4D2158

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-PLM · CESSNA 650 Citation

Hex
4D2158
Octal
23220530
Decimal
5,054,808
Country
MT
Tail
9H-PLM
Type
C650
Broadcasting now · callsign ARU500 · 125 ft
Flights observed
144
Distinct callsigns
20
Country
MT
Last broadcast
1h ago

Current position

4D2158 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4D2158 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
TAR718 Tunisair 8 2026-04-29
TAR526 Tunisair 8 2026-05-03
ARU910 - 8 2026-05-29
ARU900 - 8 2026-05-24
ARU906 - 7 2026-05-25
TAR716 Tunisair 6 2026-05-02
ARU903 - 6 2026-05-23
TAR717 Tunisair 5 2026-05-03
TAR527 Tunisair 5 2026-05-01
ARU908 - 5 2026-05-26
ARU100 Aruba Airlines 5 2026-05-25
TAR751 Tunisair 4 2026-04-30
TAR750 Tunisair 4 2026-04-30
TAR722 Tunisair 4 2026-05-02
ARU982 - 4 2026-05-23
ARU400 - 4 2026-05-28
ARU300 Aruba Airlines 4 2026-05-27
ARU200 Aruba Airlines 4 2026-05-26
TAR756 Tunisair 3 2026-04-23
TAR723 Tunisair 3 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 ARU910 - May 29, 19:40 UTCMay 29, 22:00 UTC2h 20m
2026-05-29 ARU910 - May 29, 18:50 UTCMay 29, 19:05 UTC15m
2026-05-29 ARU910 - May 29, 12:05 UTCMay 29, 17:45 UTC5h 40m
2026-05-28 ARU400 - May 28, 23:50 UTCMay 29, 00:15 UTC25m
2026-05-28 ARU400 - May 28, 19:45 UTCMay 28, 23:10 UTC3h 25m
2026-05-28 ARU914 - May 28, 18:55 UTCMay 28, 19:10 UTC15m
2026-05-28 ARU914 - May 28, 12:05 UTCMay 28, 17:40 UTC5h 35m
2026-05-27 ARU300 AUA → MIA May 27, 19:45 UTCMay 27, 23:50 UTC4h 5m
2026-05-27 ARU912 - May 27, 18:55 UTCMay 27, 19:05 UTC10m
2026-05-27 ARU912 - May 27, 17:30 UTCMay 27, 17:50 UTC20m
2026-05-27 ARU911 - May 27, 12:10 UTCMay 27, 12:30 UTC20m
2026-05-26 ARU200 CAP → AEX May 26, 19:50 UTCMay 26, 23:54 UTC4h 5m
2026-05-26 ARU908 - May 26, 18:59 UTCMay 26, 19:15 UTC15m
2026-05-26 ARU907 - May 26, 12:10 UTCMay 26, 17:55 UTC5h 45m
2026-05-25 ARU100 OPF → AEX May 25, 23:19 UTCMay 25, 23:45 UTC25m
2026-05-25 ARU100 OPF → AEX May 25, 19:35 UTCMay 25, 22:40 UTC3h 5m
2026-05-25 ARU906 - May 25, 18:45 UTCMay 25, 19:00 UTC15m
2026-05-25 ARU905 GEO → HAV May 25, 11:45 UTCMay 25, 17:30 UTC5h 45m
2026-05-24 ARU900 - May 24, 20:15 UTCMay 24, 23:20 UTC3h 5m
2026-05-24 ARU900 - May 24, 19:25 UTCMay 24, 19:40 UTC15m
2026-05-24 ARU900 - May 24, 12:35 UTCMay 24, 18:10 UTC5h 35m
2026-05-23 ARU903 - May 23, 19:10 UTCMay 24, 11:30 UTC16h 20m
2026-05-23 ARU982 - May 23, 18:15 UTCMay 23, 18:30 UTC15m
2026-05-23 ARU982 - May 23, 16:20 UTCMay 23, 16:40 UTC20m
2026-05-23 ARU981 - May 23, 11:55 UTCMay 23, 12:25 UTC30m
2026-05-22 ARU200 CAP → AEX May 22, 23:00 UTCMay 22, 23:25 UTC25m
2026-05-22 ARU910 - May 22, 19:30 UTCMay 22, 22:20 UTC2h 50m
2026-05-22 ARU910 - May 22, 18:40 UTCMay 22, 18:50 UTC10m
2026-05-22 ARU909 - May 22, 11:50 UTCMay 22, 17:20 UTC5h 30m
2026-05-21 ARU400 - May 21, 19:35 UTCMay 21, 23:45 UTC4h 10m
2026-05-21 ARU908 - May 21, 18:40 UTCMay 21, 18:55 UTC15m
2026-05-21 ARU908 - May 21, 17:15 UTCMay 21, 17:40 UTC25m
2026-05-21 ARU907 - May 21, 12:05 UTCMay 21, 12:30 UTC25m
2026-05-18 ARU100 OPF → AEX May 18, 23:15 UTCMay 18, 23:35 UTC20m
2026-05-18 ARU906 - May 18, 19:40 UTCMay 18, 22:30 UTC2h 50m
2026-05-18 ARU906 - May 18, 18:50 UTCMay 18, 19:05 UTC15m
2026-05-18 ARU906 - May 18, 17:25 UTCMay 18, 17:50 UTC25m
2026-05-18 ARU905 GEO → HAV May 18, 12:00 UTCMay 18, 12:25 UTC25m
2026-05-18 ARU300 AUA → MIA May 18, 00:05 UTCMay 18, 00:25 UTC20m
2026-05-17 ARU900 - May 17, 20:30 UTCMay 17, 23:20 UTC2h 50m
2026-05-17 ARU900 - May 17, 19:40 UTCMay 17, 19:55 UTC15m
2026-05-17 ARU900 - May 17, 18:01 UTCMay 17, 18:20 UTC20m
2026-05-17 ARU903 - May 17, 12:35 UTCMay 17, 12:55 UTC20m
2026-05-16 ARU903 - May 16, 19:00 UTCMay 17, 11:25 UTC16h 25m
2026-05-16 ARU980 - May 16, 18:05 UTCMay 16, 18:15 UTC10m
2026-05-16 ARU979 - May 16, 12:11 UTCMay 16, 16:31 UTC4h 20m
2026-05-15 ARU200 CAP → AEX May 15, 19:10 UTCMay 16, 00:05 UTC4h 55m
2026-05-15 ARU910 - May 15, 12:05 UTCMay 15, 18:00 UTC5h 54m
2026-05-14 ARU400 - May 14, 21:50 UTCMay 15, 01:55 UTC4h 5m
2026-05-14 ARU980 - May 14, 21:00 UTCMay 14, 21:10 UTC10m

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

Mode-S 4D2158 frequently asked

What is Mode-S code 4D2158?
4D2158 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-PLM.
Where is Mode-S 4D2158 registered?
Mode-S code 4D2158 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D2158 broadcasting right now?
Yes. Mode-S 4D2158 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D2158, octal 23220530, decimal 5,054,808.
What flights does 4D2158 operate?
Mode-S 4D2158 has broadcast 20 distinct callsigns, including TAR718, TAR526, ARU910, ARU900, ARU906.