Mode-S ADFEB9 · Transponder Hex for 99-0003

Q: What is Mode-S code ADFEB9?

ADFEB9 is an ICAO 24-bit transponder address. Assigned to 99-0003 .

Last known position

Most recent position reported by Mode-S ADFEB9.

Callsign history 2 distinct

Callsign	Airline	Flights	Last seen
TEST123	-	2	2026-05-20
VENUS61	-	1	2026-05-22

Recent flights last 3

Date	Flight	Route	Takeoff	Landing	Duration
2026-05-22	VENUS61	-	May 22, 18:15 UTC	May 22, 19:50 UTC	1h 35m
2026-05-20	TEST123	-	May 20, 19:00 UTC	May 20, 19:55 UTC	55m
2026-05-20	TEST123	-	May 20, 14:20 UTC	May 20, 18:10 UTC	3h 50m

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 99-0003 page for operator, model, and routing details .

Mode-S ADFEB9 frequently asked

What is Mode-S code ADFEB9?

ADFEB9 is an ICAO 24-bit transponder address. Assigned to 99-0003.

Is ADFEB9 broadcasting right now?

No active broadcast right now. Last signal was 11d ago.

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

The same 24-bit identifier expressed in different bases: hex ADFEB9, octal 53377271, decimal 11,402,937.

What flights does ADFEB9 operate?

Mode-S ADFEB9 has broadcast 2 distinct callsigns, including TEST123, VENUS61.