Apparatus

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sensors Mode-S transponder

AE1DDF

ICAO 24-bit transponder address

Currently assigned to 166556

Hex
AE1DDF
Octal
53416737
Decimal
11,410,911
Tail
166556
Type
H60
Broadcasting now · callsign RS45 · 25 ft
Flights observed
1
Distinct callsigns
1
Country
-
Last broadcast
2d ago

Current position

AE1DDF is currently broadcasting. Map zoomed to live position.

Callsign history 1 distinct

Callsign Airline Flights Last seen
RS45 - 1 2026-04-12

Recent flights last 1

DateFlightRouteTakeoffLandingDuration
2026-04-12 RS45 NZY → NZY Apr 12, 18:55 UTCApr 12, 20:15 UTC1h 20m

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 166556 page for operator, model, and routing details .

Mode-S AE1DDF frequently asked

What is Mode-S code AE1DDF?
AE1DDF is an ICAO 24-bit transponder address. Assigned to 166556.
Is AE1DDF broadcasting right now?
Yes. Mode-S AE1DDF is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AE1DDF, octal 53416737, decimal 11,410,911.
What flights does AE1DDF operate?
Mode-S AE1DDF has broadcast 1 distinct callsign, including RS45.