Mode-S ADFF78 · Transponder Hex for 66-8397

Q: What is Mode-S code ADFF78?

ADFF78 is an ICAO 24-bit transponder address. Assigned to 66-8397 .

Last known position

Most recent position reported by Mode-S ADFF78.

Callsign history 3 distinct

Callsign	Airline	Flights	Last seen
SNIPER1	-	1	2026-04-16
JAWS1	-	1	2026-04-17
CLAM1	-	1	2026-04-16

Recent flights last 3

Date	Flight	Route	Takeoff	Landing	Duration
2026-04-17	JAWS1	-	Apr 17, 18:30 UTC	Apr 17, 18:50 UTC	20m
2026-04-16	SNIPER1	-	Apr 16, 21:30 UTC	Apr 16, 21:55 UTC	25m
2026-04-16	CLAM1	-	Apr 16, 18:35 UTC	Apr 16, 19:00 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 66-8397 page for operator, model, and routing details .

Mode-S ADFF78 frequently asked

What is Mode-S code ADFF78?

ADFF78 is an ICAO 24-bit transponder address. Assigned to 66-8397.

Is ADFF78 broadcasting right now?

No active broadcast right now. Last signal was 1d ago.

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

The same 24-bit identifier expressed in different bases: hex ADFF78, octal 53377570, decimal 11,403,128.

What flights does ADFF78 operate?

Mode-S ADFF78 has broadcast 3 distinct callsigns, including SNIPER1, JAWS1, CLAM1.