Apparatus

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sensors Mode-S transponder

3D45F4

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-EYSY · CESSNA 172 Skyhawk

Hex
3D45F4
Octal
17242764
Decimal
4,015,604
Country
DE
Tail
D-EYSY
Type
C172
Broadcasting now · callsign DEYSY · 2,300 ft
Flights observed
97
Distinct callsigns
1
Country
DE
Last broadcast
5h ago

Current position

3D45F4 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 3D45F4 falls within the block assigned to Germany (DE) by ICAO Annex 10, Volume III. Every aircraft registered in Germany 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 1 distinct

Callsign Airline Flights Last seen
DEYSY - 97 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DEYSY - Jul 14, 08:35 UTCJul 14, 09:20 UTC45m
2026-07-13 DEYSY FLF → FLF Jul 13, 15:15 UTCJul 13, 16:05 UTC50m
2026-07-13 DEYSY - Jul 13, 10:40 UTCJul 13, 12:05 UTC1h 25m
2026-07-12 DEYSY - Jul 12, 16:40 UTCJul 12, 17:50 UTC1h 10m
2026-07-12 DEYSY - Jul 12, 09:00 UTCJul 12, 12:45 UTC3h 45m
2026-07-11 DEYSY - Jul 11, 08:01 UTCJul 11, 09:00 UTC1h 0m
2026-07-10 DEYSY - Jul 10, 13:40 UTCJul 10, 15:20 UTC1h 40m
2026-07-08 DEYSY - Jul 8, 08:05 UTCJul 8, 08:45 UTC40m
2026-07-05 DEYSY - Jul 5, 15:15 UTCJul 5, 16:05 UTC50m
2026-07-05 DEYSY - Jul 5, 09:20 UTCJul 5, 10:15 UTC55m
2026-07-01 DEYSY - Jul 1, 17:20 UTCJul 1, 17:55 UTC35m
2026-07-01 DEYSY - Jul 1, 15:15 UTCJul 1, 16:10 UTC55m
2026-06-30 DEYSY FLF → FLF Jun 30, 08:55 UTCJun 30, 09:25 UTC30m
2026-06-30 DEYSY FLF → FLF Jun 30, 07:30 UTCJun 30, 08:05 UTC35m
2026-06-29 DEYSY FLF → FLF Jun 29, 16:25 UTCJun 29, 17:24 UTC1h 0m
2026-06-29 DEYSY FLF → FLF Jun 29, 15:14 UTCJun 29, 15:39 UTC25m
2026-06-28 DEYSY - Jun 28, 15:34 UTCJun 28, 16:09 UTC35m
2026-06-28 DEYSY - Jun 28, 12:15 UTCJun 28, 13:10 UTC55m
2026-06-27 DEYSY - Jun 27, 08:10 UTCJun 27, 09:09 UTC1h 0m
2026-06-26 DEYSY - Jun 26, 12:44 UTCJun 26, 14:25 UTC1h 40m
2026-06-26 DEYSY - Jun 26, 07:45 UTCJun 26, 08:40 UTC55m
2026-06-25 DEYSY - Jun 25, 11:39 UTCJun 25, 12:15 UTC35m
2026-06-25 DEYSY - Jun 25, 09:45 UTCJun 25, 10:39 UTC55m
2026-06-24 DEYSY - Jun 24, 16:29 UTCJun 24, 16:59 UTC30m
2026-06-22 DEYSY - Jun 22, 13:49 UTCJun 22, 14:24 UTC35m
2026-06-21 DEYSY - Jun 21, 15:44 UTCJun 21, 16:59 UTC1h 15m
2026-06-20 DEYSY - Jun 20, 13:14 UTCJun 20, 15:09 UTC1h 55m
2026-06-20 DEYSY - Jun 20, 08:25 UTCJun 20, 10:04 UTC1h 40m
2026-06-18 DEYSY FLF → FLF Jun 18, 17:15 UTCJun 18, 17:45 UTC30m
2026-06-17 DEYSY - Jun 17, 14:35 UTCJun 17, 15:46 UTC1h 10m
2026-06-08 DEYSY - Jun 8, 16:55 UTCJun 8, 18:00 UTC1h 5m
2026-06-08 DEYSY FLF → FLF Jun 8, 16:00 UTCJun 8, 16:15 UTC15m
2026-06-06 DEYSY - Jun 6, 12:10 UTCJun 6, 12:35 UTC25m
2026-06-06 DEYSY - Jun 6, 10:00 UTCJun 6, 10:55 UTC55m
2026-06-06 DEYSY - Jun 6, 08:40 UTCJun 6, 09:19 UTC40m
2026-06-02 DEYSY - Jun 2, 17:00 UTCJun 2, 17:55 UTC55m
2026-06-01 DEYSY - Jun 1, 09:10 UTCJun 1, 10:15 UTC1h 5m
2026-05-31 DEYSY - May 31, 14:05 UTCMay 31, 15:45 UTC1h 40m
2026-05-31 DEYSY - May 31, 12:10 UTCMay 31, 12:35 UTC25m
2026-05-30 DEYSY FLF → FLF May 30, 13:00 UTCMay 30, 14:35 UTC1h 35m
2026-05-30 DEYSY - May 30, 11:20 UTCMay 30, 12:05 UTC45m
2026-05-30 DEYSY FLF → FLF May 30, 08:45 UTCMay 30, 09:45 UTC1h 0m
2026-05-29 DEYSY - May 29, 13:25 UTCMay 29, 14:25 UTC1h 0m
2026-05-29 DEYSY - May 29, 08:45 UTCMay 29, 11:05 UTC2h 20m
2026-05-28 DEYSY - May 28, 15:25 UTCMay 28, 16:05 UTC40m
2026-05-28 DEYSY - May 28, 13:50 UTCMay 28, 14:35 UTC45m
2026-05-27 DEYSY - May 27, 17:10 UTCMay 27, 17:55 UTC45m
2026-05-27 DEYSY - May 27, 15:35 UTCMay 27, 16:30 UTC55m
2026-05-26 DEYSY - May 26, 13:00 UTCMay 26, 14:55 UTC1h 55m
2026-05-25 DEYSY - May 25, 13:00 UTCMay 25, 14:05 UTC1h 5m

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 D-EYSY page for operator, model, and routing details .

Mode-S 3D45F4 frequently asked

What is Mode-S code 3D45F4?
3D45F4 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-EYSY.
Where is Mode-S 3D45F4 registered?
Mode-S code 3D45F4 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3D45F4 broadcasting right now?
Yes. Mode-S 3D45F4 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3D45F4, octal 17242764, decimal 4,015,604.
What flights does 3D45F4 operate?
Mode-S 3D45F4 has broadcast 1 distinct callsign, including DEYSY.