sensors Mode-S transponder

AE509D

ICAO 24-bit transponder address

Currently assigned to 10-80263 · DE HAVILLAND DHC-6 Twin Otter

Hex
AE509D
Octal
53450235
Decimal
11,423,901
Tail
10-80263
Type
DHC6
Broadcasting now · callsign GKA263 · 10,275 ft
Flights observed
1
Distinct callsigns
1
Country
-
Last broadcast
1d ago

Current position

AE509D is currently broadcasting. Map zoomed to live position.

Callsign history 1 distinct

Callsign Airline Flights Last seen
GKA263 - 1 2026-04-13

Recent flights last 1

DateFlightRouteTakeoffLandingDuration
2026-04-13 GKA263 - Apr 13, 13:10 UTCApr 13, 14:20 UTC1h 10m

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 10-80263 page for operator, model, and routing details .

Mode-S AE509D frequently asked

What is Mode-S code AE509D?
AE509D is an ICAO 24-bit transponder address. Assigned to 10-80263.
Is AE509D broadcasting right now?
Yes. Mode-S AE509D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AE509D, octal 53450235, decimal 11,423,901.
What flights does AE509D operate?
Mode-S AE509D has broadcast 1 distinct callsign, including GKA263.