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sensors Mode-S transponder

4D23EF

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-PET · DE HAVILLAND DHC-8-400 Dash 8

Hex
4D23EF
Octal
23221757
Decimal
5,055,471
Country
MT
Tail
9H-PET
Type
DH8D
No current signal · last broadcast 19d ago
Flights observed
234
Distinct callsigns
20
Country
MT
Last broadcast
19d ago

Last known position

Most recent position reported by Mode-S 4D23EF.

Country allocation

The ICAO 24-bit address 4D23EF 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
SWU1910 Swiss European Air Lines 15 2026-07-25
SWU1911 Swiss European Air Lines 14 2026-07-25
SWU1907 Swiss European Air Lines 13 2026-07-19
SWU1906 Swiss European Air Lines 13 2026-07-19
SWU1955 Swiss European Air Lines 12 2026-07-19
SWU1954 Swiss European Air Lines 12 2026-07-19
SWU1953 Swiss European Air Lines 9 2026-07-26
SWU1952 Swiss European Air Lines 9 2026-07-26
SWU1951 Swiss European Air Lines 8 2026-07-04
SWU1950 - 8 2026-07-04
SWU1981 - 6 2026-07-23
SWU1980 Swiss European Air Lines 6 2026-07-23
SWU1933 Swiss European Air Lines 5 2026-07-04
SWU1932 Swiss European Air Lines 5 2026-07-04
SWU1909 - 5 2026-07-15
SWU1908 - 5 2026-07-15
SWU2382 - 4 2026-07-11
SWU2381 Swiss European Air Lines 4 2026-07-17
SWU2380 Swiss European Air Lines 4 2026-07-17
SWU1964 Swiss European Air Lines 4 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWU1953 DUS → BZO Jul 26, 18:25 UTCJul 26, 19:50 UTC1h 25m
2026-07-26 SWU1952 BZO → DUS Jul 26, 16:00 UTCJul 26, 17:30 UTC1h 30m
2026-07-26 SWU1964 ANR → BZO Jul 26, 13:15 UTCJul 26, 14:40 UTC1h 25m
2026-07-26 SWU1963 BZO → ANR Jul 26, 10:45 UTCJul 26, 12:15 UTC1h 30m
2026-07-26 SWU1905 BDS → BZO Jul 26, 07:45 UTCJul 26, 09:35 UTC1h 50m
2026-07-26 SWU1904 BZO → BDS Jul 26, 05:00 UTCJul 26, 06:15 UTC1h 15m
2026-07-25 SWU1911 CAG → BZO Jul 25, 09:10 UTCJul 25, 10:30 UTC1h 20m
2026-07-25 SWU1910 BZO → CAG Jul 25, 06:05 UTCJul 25, 07:25 UTC1h 20m
2026-07-24 SWU1911 CAG → BZO Jul 24, 19:45 UTCJul 24, 21:00 UTC1h 15m
2026-07-24 SWU1910 - Jul 24, 17:30 UTCJul 24, 18:45 UTC1h 15m
2026-07-24 SWU1967 MAH → BZO Jul 24, 14:55 UTCJul 24, 16:35 UTC1h 40m
2026-07-24 SWU1966 BZO → MAH Jul 24, 12:15 UTCJul 24, 14:00 UTC1h 45m
2026-07-24 SWU1947 EFL → BZO Jul 24, 09:00 UTCJul 24, 11:20 UTC2h 20m
2026-07-24 SWU1946 BZO → EFL Jul 24, 05:35 UTCJul 24, 08:05 UTC2h 30m
2026-07-23 SWU1969 - Jul 23, 15:45 UTCJul 23, 17:55 UTC2h 10m
2026-07-23 SWU1968 BZO → IBZ Jul 23, 12:30 UTCJul 23, 14:45 UTC2h 15m
2026-07-23 SWU1981 - Jul 23, 09:40 UTCJul 23, 11:00 UTC1h 20m
2026-07-23 SWU1980 BZO → HAJ Jul 23, 07:20 UTCJul 23, 08:45 UTC1h 25m
2026-07-19 SWU1955 HAM → BZO Jul 19, 19:20 UTCJul 19, 20:50 UTC1h 30m
2026-07-19 SWU1954 BZO → HAM Jul 19, 16:45 UTCJul 19, 18:20 UTC1h 35m
2026-07-19 SWU1953 - Jul 19, 12:20 UTCJul 19, 13:55 UTC1h 35m
2026-07-19 SWU1952 - Jul 19, 09:45 UTCJul 19, 11:15 UTC1h 30m
2026-07-19 SWU1907 OLB → BZO Jul 19, 07:40 UTCJul 19, 08:40 UTC1h 0m
2026-07-19 SWU1906 BZO → OLB Jul 19, 05:15 UTCJul 19, 06:15 UTC1h 0m
2026-07-18 SWU1905 - Jul 18, 12:35 UTCJul 18, 14:10 UTC1h 35m
2026-07-18 SWU1904 - Jul 18, 09:55 UTCJul 18, 11:25 UTC1h 30m
2026-07-18 SWU1907 - Jul 18, 07:30 UTCJul 18, 08:30 UTC1h 0m
2026-07-18 SWU1906 - Jul 18, 05:15 UTCJul 18, 06:15 UTC1h 0m
2026-07-17 SWU1941 - Jul 17, 18:00 UTCJul 17, 19:40 UTC1h 40m
2026-07-17 SWU1940 - Jul 17, 14:44 UTCJul 17, 16:19 UTC1h 35m
2026-07-17 SWU1907 - Jul 17, 12:25 UTCJul 17, 13:40 UTC1h 15m
2026-07-17 SWU2381 BRN → OLB Jul 17, 10:00 UTCJul 17, 11:30 UTC1h 30m
2026-07-17 SWU2380 OLB → BRN Jul 17, 08:00 UTCJul 17, 09:20 UTC1h 20m
2026-07-17 SWU1906 - Jul 17, 05:39 UTCJul 17, 06:45 UTC1h 5m
2026-07-16 SWU1955 HAM → BZO Jul 16, 16:09 UTCJul 16, 17:49 UTC1h 40m
2026-07-16 SWU1954 BZO → HAM Jul 16, 13:49 UTCJul 16, 15:25 UTC1h 35m
2026-07-16 SWU1964 ANR → BZO Jul 16, 10:55 UTCJul 16, 12:30 UTC1h 35m
2026-07-16 SWU1963 - Jul 16, 08:20 UTCJul 16, 10:00 UTC1h 40m
2026-07-15 SWU1907 - Jul 15, 14:00 UTCJul 15, 15:05 UTC1h 5m
2026-07-15 SWU1906 - Jul 15, 11:45 UTCJul 15, 13:05 UTC1h 20m
2026-07-15 SWU1909 - Jul 15, 08:40 UTCJul 15, 10:40 UTC2h 0m
2026-07-15 SWU1908 - Jul 15, 05:40 UTCJul 15, 07:15 UTC1h 35m
2026-07-14 SWU1955 HAM → BZO Jul 14, 16:15 UTCJul 14, 18:00 UTC1h 45m
2026-07-14 SWU1954 BZO → HAM Jul 14, 13:50 UTCJul 14, 15:35 UTC1h 45m
2026-07-14 SWU1953 - Jul 14, 10:50 UTCJul 14, 12:15 UTC1h 25m
2026-07-14 SWU1952 BZO → DUS Jul 14, 08:05 UTCJul 14, 09:40 UTC1h 35m
2026-07-12 SWU1955 HAM → BZO Jul 12, 18:01 UTCJul 12, 19:45 UTC1h 45m
2026-07-12 SWU1954 BZO → HAM Jul 12, 15:20 UTCJul 12, 16:55 UTC1h 35m
2026-07-12 SWU1909 - Jul 12, 09:00 UTCJul 12, 10:50 UTC1h 50m
2026-07-12 SWU1908 - Jul 12, 05:50 UTCJul 12, 07:40 UTC1h 50m

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

Mode-S 4D23EF frequently asked

What is Mode-S code 4D23EF?
4D23EF is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-PET.
Where is Mode-S 4D23EF registered?
Mode-S code 4D23EF is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D23EF broadcasting right now?
No active broadcast right now. Last signal was 19d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D23EF, octal 23221757, decimal 5,055,471.
What flights does 4D23EF operate?
Mode-S 4D23EF has broadcast 20 distinct callsigns, including SWU1910, SWU1911, SWU1907, SWU1906, SWU1955.