Mode-S AE5653 · Transponder Hex for 12-20442

Q: What is Mode-S code AE5653?

AE5653 is an ICAO 24-bit transponder address. Assigned to 12-20442 .

Last known position

Most recent position reported by Mode-S AE5653.

Callsign history 3 distinct

Callsign	Airline	Flights	Last seen
SURF18	-	2	2026-04-20
SURF25	-	1	2026-04-22
SURF23	-	1	2026-04-29

Recent flights last 4

Date	Flight	Route	Takeoff	Landing	Duration
2026-04-29	SURF23	-	Apr 29, 02:24 UTC	Apr 29, 04:00 UTC	1h 35m
2026-04-22	SURF25	-	Apr 22, 06:55 UTC	Apr 22, 07:50 UTC	55m
2026-04-20	SURF18	-	Apr 20, 21:50 UTC	Apr 20, 22:05 UTC	15m
2026-04-20	SURF18	-	Apr 20, 21:00 UTC	Apr 20, 21:15 UTC	15m

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 12-20442 page for operator, model, and routing details .

Mode-S AE5653 frequently asked

What is Mode-S code AE5653?

AE5653 is an ICAO 24-bit transponder address. Assigned to 12-20442.

Is AE5653 broadcasting right now?

No active broadcast right now. Last signal was 6d ago.

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

The same 24-bit identifier expressed in different bases: hex AE5653, octal 53453123, decimal 11,425,363.

What flights does AE5653 operate?

Mode-S AE5653 has broadcast 3 distinct callsigns, including SURF18, SURF25, SURF23.