Apparatus

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sensors Mode-S transponder

4D2516

ICAO 24-bit transponder address

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

Hex
4D2516
Octal
23222426
Decimal
5,055,766
Tail
9H-PAUL
Type
DH8D
No current signal · last broadcast 1d ago
Flights observed
169
Distinct callsigns
20
Country
-
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4D2516.

Callsign history 20 distinct

Callsign Airline Flights Last seen
SWU1919 Swiss European Air Lines 20 2026-07-26
SWU1918 Swiss European Air Lines 18 2026-07-26
SWU1993 Swiss European Air Lines 6 2026-07-25
SWU1992 Swiss European Air Lines 6 2026-07-25
SWU1991 Swiss European Air Lines 6 2026-07-26
SWU1990 Swiss European Air Lines 6 2026-07-26
SWU1985 Swiss European Air Lines 5 2026-07-24
SWU1984 - 5 2026-07-24
SWU1975 Swiss European Air Lines 5 2026-07-24
SWU1974 Swiss European Air Lines 5 2026-07-24
SWU1933 Swiss European Air Lines 5 2026-07-05
SWU1932 - 5 2026-07-05
SWU1969 - 4 2026-06-30
SWU1968 Swiss European Air Lines 4 2026-06-30
SWU1957 - 3 2026-06-22
SWU1955 Swiss European Air Lines 3 2026-07-02
SWU1954 Swiss European Air Lines 3 2026-07-02
SWU1911 - 3 2026-07-04
SWU1910 - 3 2026-07-04
SWU1907 Swiss European Air Lines 3 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWU1919 FCO → CRV Jul 26, 16:00 UTCJul 26, 16:55 UTC55m
2026-07-26 SWU1991 KLU → FCO Jul 26, 13:10 UTCJul 26, 14:25 UTC1h 15m
2026-07-26 SWU1990 FCO → KLU Jul 26, 11:10 UTCJul 26, 12:25 UTC1h 15m
2026-07-26 SWU1918 CRV → FCO Jul 26, 05:40 UTCJul 26, 06:50 UTC1h 11m
2026-07-25 SWU1919 FCO → CRV Jul 25, 16:05 UTCJul 25, 16:55 UTC50m
2026-07-25 SWU1993 SZG → FCO Jul 25, 10:30 UTCJul 25, 11:40 UTC1h 10m
2026-07-25 SWU1992 FCO → SZG Jul 25, 08:20 UTCJul 25, 09:45 UTC1h 25m
2026-07-25 SWU1918 CRV → FCO Jul 25, 05:35 UTCJul 25, 06:45 UTC1h 10m
2026-07-24 SWU1919 FCO → CRV Jul 24, 16:35 UTCJul 24, 17:25 UTC50m
2026-07-24 SWU1975 OMO → FCO Jul 24, 14:30 UTCJul 24, 15:20 UTC50m
2026-07-24 SWU1985 BRI → OMO Jul 24, 12:40 UTCJul 24, 13:10 UTC30m
2026-07-24 SWU1984 - Jul 24, 11:00 UTCJul 24, 11:20 UTC20m
2026-07-24 SWU1974 FCO → OMO Jul 24, 08:45 UTCJul 24, 09:40 UTC55m
2026-07-24 SWU1918 CRV → FCO Jul 24, 05:50 UTCJul 24, 07:00 UTC1h 10m
2026-07-23 SWU1919 FCO → CRV Jul 23, 16:20 UTCJul 23, 17:10 UTC50m
2026-07-23 SWU1991 KLU → FCO Jul 23, 10:30 UTCJul 23, 11:40 UTC1h 10m
2026-07-23 SWU1990 - Jul 23, 08:35 UTCJul 23, 09:45 UTC1h 10m
2026-07-23 SWU1918 CRV → FCO Jul 23, 05:35 UTCJul 23, 06:45 UTC1h 10m
2026-07-22 SWU1919 FCO → CRV Jul 22, 15:45 UTCJul 22, 16:40 UTC55m
2026-07-21 SWU1919 - Jul 21, 16:20 UTCJul 21, 17:15 UTC55m
2026-07-21 SWU1993 SZG → FCO Jul 21, 11:05 UTCJul 21, 12:30 UTC1h 25m
2026-07-21 SWU1992 FCO → SZG Jul 21, 09:00 UTCJul 21, 10:20 UTC1h 20m
2026-07-21 SWU1918 CRV → FCO Jul 21, 06:15 UTCJul 21, 07:25 UTC1h 10m
2026-07-20 SWU1919 - Jul 20, 16:25 UTCJul 20, 17:20 UTC55m
2026-07-20 SWU1975 OMO → FCO Jul 20, 14:15 UTCJul 20, 15:15 UTC1h 0m
2026-07-20 SWU1985 BRI → OMO Jul 20, 12:50 UTCJul 20, 13:15 UTC25m
2026-07-20 SWU1984 - Jul 20, 11:05 UTCJul 20, 11:40 UTC35m
2026-07-20 SWU1974 FCO → OMO Jul 20, 09:20 UTCJul 20, 10:20 UTC1h 0m
2026-07-20 SWU1918 CRV → FCO Jul 20, 06:45 UTCJul 20, 08:00 UTC1h 15m
2026-07-19 SWU1919 - Jul 19, 15:35 UTCJul 19, 16:25 UTC50m
2026-07-19 SWU1991 KLU → FCO Jul 19, 13:15 UTCJul 19, 14:20 UTC1h 5m
2026-07-19 SWU1990 - Jul 19, 11:00 UTCJul 19, 12:05 UTC1h 5m
2026-07-19 SWU1918 CRV → FCO Jul 19, 05:45 UTCJul 19, 06:55 UTC1h 10m
2026-07-18 SWU1919 - Jul 18, 16:05 UTCJul 18, 16:50 UTC45m
2026-07-18 SWU1993 SZG → FCO Jul 18, 10:20 UTCJul 18, 11:35 UTC1h 15m
2026-07-18 SWU1992 FCO → SZG Jul 18, 08:10 UTCJul 18, 09:40 UTC1h 30m
2026-07-18 SWU1918 CRV → FCO Jul 18, 05:40 UTCJul 18, 06:45 UTC1h 5m
2026-07-17 SWU1919 - Jul 17, 15:55 UTCJul 17, 16:44 UTC50m
2026-07-17 SWU1975 OMO → FCO Jul 17, 13:25 UTCJul 17, 14:15 UTC50m
2026-07-17 SWU1985 BRI → OMO Jul 17, 11:45 UTCJul 17, 12:15 UTC30m
2026-07-17 SWU1984 - Jul 17, 10:10 UTCJul 17, 10:44 UTC35m
2026-07-17 SWU1974 FCO → OMO Jul 17, 08:25 UTCJul 17, 09:10 UTC45m
2026-07-17 SWU1918 - Jul 17, 05:35 UTCJul 17, 06:40 UTC1h 5m
2026-07-16 SWU1919 FCO → CRV Jul 16, 15:30 UTCJul 16, 16:25 UTC55m
2026-07-16 SWU1991 KLU → FCO Jul 16, 10:15 UTCJul 16, 11:20 UTC1h 5m
2026-07-16 SWU1990 - Jul 16, 08:15 UTCJul 16, 09:30 UTC1h 15m
2026-07-16 SWU1918 - Jul 16, 05:40 UTCJul 16, 06:45 UTC1h 5m
2026-07-15 SWU1919 - Jul 15, 15:45 UTCJul 15, 16:55 UTC1h 10m
2026-07-15 SWU1918 - Jul 15, 05:30 UTCJul 15, 06:35 UTC1h 5m
2026-07-14 SWU1919 FCO → CRV Jul 14, 15:55 UTCJul 14, 16:50 UTC55m

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

Mode-S 4D2516 frequently asked

What is Mode-S code 4D2516?
4D2516 is an ICAO 24-bit transponder address. Assigned to 9H-PAUL.
Is 4D2516 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D2516, octal 23222426, decimal 5,055,766.
What flights does 4D2516 operate?
Mode-S 4D2516 has broadcast 20 distinct callsigns, including SWU1919, SWU1918, SWU1993, SWU1992, SWU1991.