Apparatus

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sensors Mode-S transponder

3FF5D9

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-MMIM · REMOS Mirage

Hex
3FF5D9
Octal
17772731
Decimal
4,191,705
Country
DE
Tail
D-MMIM
Type
G3
Broadcasting now · callsign DMMIM · 975 ft
Flights observed
5
Distinct callsigns
1
Country
DE
Last broadcast
2h ago

Current position

3FF5D9 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 3FF5D9 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
DMMIM - 5 2026-05-09

Recent flights last 5

DateFlightRouteTakeoffLandingDuration
2026-05-09 DMMIM - May 9, 12:05 UTCMay 9, 12:35 UTC30m
2026-05-01 DMMIM - May 1, 14:30 UTCMay 1, 15:45 UTC1h 15m
2026-05-01 DMMIM - May 1, 09:40 UTCMay 1, 11:15 UTC1h 35m
2026-04-14 DMMIM - Apr 14, 14:05 UTCApr 14, 14:20 UTC15m
2026-04-14 DMMIM - Apr 14, 09:10 UTCApr 14, 09:25 UTC15m

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

Mode-S 3FF5D9 frequently asked

What is Mode-S code 3FF5D9?
3FF5D9 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-MMIM.
Where is Mode-S 3FF5D9 registered?
Mode-S code 3FF5D9 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3FF5D9 broadcasting right now?
Yes. Mode-S 3FF5D9 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3FF5D9, octal 17772731, decimal 4,191,705.
What flights does 3FF5D9 operate?
Mode-S 3FF5D9 has broadcast 1 distinct callsign, including DMMIM.