Mode-S AE599D · Transponder Hex for 13-08435

Q: What is Mode-S code AE599D?

AE599D is an ICAO 24-bit transponder address. Assigned to 13-08435 .

Last known position

Most recent position reported by Mode-S AE599D.

Callsign history 2 distinct

Callsign	Airline	Flights	Last seen
GRIT98	-	2	2026-04-23
GRIT96	-	1	2026-04-14

Recent flights last 3

Date	Flight	Route	Takeoff	Landing	Duration
2026-04-23	GRIT98	-	Apr 23, 20:15 UTC	Apr 23, 21:40 UTC	1h 25m
2026-04-23	GRIT98	-	Apr 23, 18:00 UTC	Apr 23, 19:40 UTC	1h 40m
2026-04-14	GRIT96	-	Apr 14, 19:25 UTC	Apr 14, 20:00 UTC	35m

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 13-08435 page for operator, model, and routing details .

Mode-S AE599D frequently asked

What is Mode-S code AE599D?

AE599D is an ICAO 24-bit transponder address. Assigned to 13-08435.

Is AE599D broadcasting right now?

No active broadcast right now. Last signal was 3h ago.

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

The same 24-bit identifier expressed in different bases: hex AE599D, octal 53454635, decimal 11,426,205.

What flights does AE599D operate?

Mode-S AE599D has broadcast 2 distinct callsigns, including GRIT98, GRIT96.