Apparatus

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sensors Mode-S transponder

3D1255

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-EFER · PIPER PA-18 Super Cub

Hex
3D1255
Octal
17211125
Decimal
4,002,389
Country
DE
Tail
D-EFER
Type
PA18
No current signal · last broadcast 1d ago
Flights observed
73
Distinct callsigns
1
Country
DE
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 3D1255.

Country allocation

The ICAO 24-bit address 3D1255 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
DEFER - 73 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-01 DEFER - Jun 1, 14:35 UTCJun 1, 15:45 UTC1h 10m
2026-05-30 DEFER BWE → BWE May 30, 15:40 UTCMay 30, 16:45 UTC1h 5m
2026-05-30 DEFER BWE → BWE May 30, 13:05 UTCMay 30, 14:05 UTC1h 0m
2026-05-30 DEFER BWE → BWE May 30, 09:50 UTCMay 30, 10:25 UTC35m
2026-05-30 DEFER - May 30, 08:35 UTCMay 30, 09:10 UTC35m
2026-05-29 DEFER BWE → BWE May 29, 17:00 UTCMay 29, 18:00 UTC1h 0m
2026-05-29 DEFER - May 29, 15:25 UTCMay 29, 16:20 UTC56m
2026-05-28 DEFER BWE → BWE May 28, 16:00 UTCMay 28, 16:55 UTC55m
2026-05-28 DEFER - May 28, 12:00 UTCMay 28, 12:25 UTC25m
2026-05-28 DEFER - May 28, 09:35 UTCMay 28, 11:30 UTC1h 55m
2026-05-28 DEFER - May 28, 07:55 UTCMay 28, 08:50 UTC55m
2026-05-26 DEFER AGE → BWE May 26, 13:10 UTCMay 26, 14:24 UTC1h 15m
2026-05-26 DEFER BWE → AGE May 26, 07:15 UTCMay 26, 08:45 UTC1h 30m
2026-05-25 DEFER KEL → BWE May 25, 13:10 UTCMay 25, 14:25 UTC1h 15m
2026-05-24 DEFER BWE → KEL May 24, 12:25 UTCMay 24, 14:00 UTC1h 35m
2026-05-23 DEFER LGO → BWE May 23, 14:10 UTCMay 23, 15:45 UTC1h 35m
2026-05-23 DEFER - May 23, 08:00 UTCMay 23, 09:45 UTC1h 45m
2026-05-22 DEFER - May 22, 18:30 UTCMay 22, 19:05 UTC35m
2026-05-22 DEFER - May 22, 13:30 UTCMay 22, 14:30 UTC1h 0m
2026-05-22 DEFER - May 22, 07:40 UTCMay 22, 08:45 UTC1h 5m
2026-05-19 DEFER - May 19, 14:40 UTCMay 19, 15:50 UTC1h 10m
2026-05-18 DEFER - May 18, 10:55 UTCMay 18, 11:15 UTC20m
2026-05-17 DEFER - May 17, 16:10 UTCMay 17, 16:55 UTC45m
2026-05-17 DEFER - May 17, 09:35 UTCMay 17, 10:10 UTC35m
2026-05-16 DEFER - May 16, 16:20 UTCMay 16, 16:55 UTC35m
2026-05-16 DEFER - May 16, 13:25 UTCMay 16, 15:20 UTC1h 55m
2026-05-16 DEFER - May 16, 12:31 UTCMay 16, 12:55 UTC25m
2026-05-10 DEFER - May 10, 14:45 UTCMay 10, 17:25 UTC2h 40m
2026-05-10 DEFER - May 10, 10:10 UTCMay 10, 14:09 UTC4h 0m
2026-05-10 DEFER - May 10, 09:15 UTCMay 10, 09:35 UTC20m
2026-05-09 DEFER - May 9, 16:10 UTCMay 9, 17:15 UTC1h 5m
2026-05-09 DEFER - May 9, 11:40 UTCMay 9, 14:00 UTC2h 20m
2026-05-08 DEFER - May 8, 07:04 UTCMay 8, 13:35 UTC6h 30m
2026-05-02 DEFER BWE → BWE May 2, 17:05 UTCMay 2, 17:45 UTC40m
2026-05-02 DEFER - May 2, 15:30 UTCMay 2, 16:25 UTC55m
2026-05-02 DEFER - May 2, 14:15 UTCMay 2, 14:45 UTC30m
2026-05-02 DEFER - May 2, 12:25 UTCMay 2, 13:20 UTC55m
2026-05-01 DEFER - May 1, 16:30 UTCMay 1, 17:05 UTC35m
2026-05-01 DEFER - May 1, 13:25 UTCMay 1, 13:55 UTC30m
2026-05-01 DEFER BWE → BWE May 1, 11:45 UTCMay 1, 12:45 UTC1h 0m
2026-05-01 DEFER NUE → BWE May 1, 08:15 UTCMay 1, 09:50 UTC1h 35m
2026-04-30 DEFER - Apr 30, 07:40 UTCApr 30, 09:20 UTC1h 40m
2026-04-29 DEFER - Apr 29, 16:30 UTCApr 29, 17:35 UTC1h 5m
2026-04-29 DEFER - Apr 29, 14:45 UTCApr 29, 15:35 UTC50m
2026-04-29 DEFER - Apr 29, 09:20 UTCApr 29, 13:55 UTC4h 35m
2026-04-29 DEFER - Apr 29, 06:49 UTCApr 29, 08:50 UTC2h 0m
2026-04-28 DEFER - Apr 28, 17:35 UTCApr 28, 18:40 UTC1h 5m
2026-04-28 DEFER - Apr 28, 15:35 UTCApr 28, 16:05 UTC30m
2026-04-27 DEFER - Apr 27, 17:15 UTCApr 27, 18:15 UTC1h 0m
2026-04-27 DEFER - Apr 27, 14:25 UTCApr 27, 14:55 UTC30m

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

Mode-S 3D1255 frequently asked

What is Mode-S code 3D1255?
3D1255 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-EFER.
Where is Mode-S 3D1255 registered?
Mode-S code 3D1255 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3D1255 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 3D1255, octal 17211125, decimal 4,002,389.
What flights does 3D1255 operate?
Mode-S 3D1255 has broadcast 1 distinct callsign, including DEFER.