Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AE4EF4

ICAO 24-bit transponder address

Currently assigned to 166494 · BELL-BOEING V-22 Osprey

Hex
AE4EF4
Octal
53447364
Decimal
11,423,476
Tail
166494
Type
V22
No current signal · last broadcast 1d ago
Flights observed
2
Distinct callsigns
1
Country
-
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S AE4EF4.

Callsign history 1 distinct

Callsign Airline Flights Last seen
OSPRY73 - 2 2026-04-13

Recent flights last 2

DateFlightRouteTakeoffLandingDuration
2026-04-13 OSPRY73 - Apr 13, 23:15 UTCApr 13, 23:40 UTC25m
2026-04-13 OSPRY73 - Apr 13, 17:50 UTCApr 13, 18:20 UTC30m

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 166494 page for operator, model, and routing details .

Mode-S AE4EF4 frequently asked

What is Mode-S code AE4EF4?
AE4EF4 is an ICAO 24-bit transponder address. Assigned to 166494.
Is AE4EF4 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 AE4EF4, octal 53447364, decimal 11,423,476.
What flights does AE4EF4 operate?
Mode-S AE4EF4 has broadcast 1 distinct callsign, including OSPRY73.