Mode-S AE564D · Transponder Hex for 12-20436

Q: What is Mode-S code AE564D?

AE564D is an ICAO 24-bit transponder address. Assigned to 12-20436 .

Last known position

Most recent position reported by Mode-S AE564D.

Callsign history 2 distinct

Callsign	Airline	Flights	Last seen
SURF15	-	3	2026-04-21
SURF50	-	1	2026-04-17

Recent flights last 4

Date	Flight	Route	Takeoff	Landing	Duration
2026-04-21	SURF15	-	Apr 21, 03:45 UTC	Apr 21, 04:55 UTC	1h 10m
2026-04-21	SURF15	-	Apr 21, 01:40 UTC	Apr 21, 02:30 UTC	50m
2026-04-17	SURF50	-	Apr 17, 01:45 UTC	Apr 17, 03:10 UTC	1h 25m
2026-04-15	SURF15	-	Apr 15, 06:25 UTC	Apr 15, 06:50 UTC	25m

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 12-20436 page for operator, model, and routing details .

Mode-S AE564D frequently asked

What is Mode-S code AE564D?

AE564D is an ICAO 24-bit transponder address. Assigned to 12-20436.

Is AE564D broadcasting right now?

No active broadcast right now. Last signal was 14d ago.

Hex, octal, and decimal Mode-S codes: what's the difference?

The same 24-bit identifier expressed in different bases: hex AE564D, octal 53453115, decimal 11,425,357.

What flights does AE564D operate?

Mode-S AE564D has broadcast 2 distinct callsigns, including SURF15, SURF50.