Apparatus

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sensors Mode-S transponder

3DDDAF

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-HEEX · AIRBUS HELICOPTERS EC-135/635

Hex
3DDDAF
Octal
17356657
Decimal
4,054,447
Country
DE
Tail
D-HEEX
Type
EC35
No current signal · last broadcast 1d ago
Flights observed
6
Distinct callsigns
2
Country
DE
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 3DDDAF.

Country allocation

The ICAO 24-bit address 3DDDAF 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 2 distinct

Callsign Airline Flights Last seen
RDF3 - 5 2026-04-17
DHEEX - 1 2026-04-16

Recent flights last 6

DateFlightRouteTakeoffLandingDuration
2026-04-17 RDF3 - Apr 17, 11:20 UTCApr 17, 12:00 UTC40m
2026-04-17 RDF3 - Apr 17, 11:00 UTCApr 17, 11:15 UTC15m
2026-04-16 RDF3 - Apr 16, 13:15 UTCApr 16, 14:15 UTC1h 0m
2026-04-16 DHEEX - Apr 16, 12:24 UTCApr 16, 13:05 UTC40m
2026-04-16 RDF3 - Apr 16, 06:25 UTCApr 16, 06:55 UTC30m
2026-04-13 RDF3 - Apr 13, 12:45 UTCApr 13, 13:20 UTC35m

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

Mode-S 3DDDAF frequently asked

What is Mode-S code 3DDDAF?
3DDDAF is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-HEEX.
Where is Mode-S 3DDDAF registered?
Mode-S code 3DDDAF is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3DDDAF 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 3DDDAF, octal 17356657, decimal 4,054,447.
What flights does 3DDDAF operate?
Mode-S 3DDDAF has broadcast 2 distinct callsigns, including RDF3, DHEEX.