Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AE74B9

ICAO 24-bit transponder address

Currently assigned to 22-21237 · SIKORSKY UH-60 Black Hawk

Hex
AE74B9
Octal
53472271
Decimal
11,433,145
Tail
22-21237
Type
H60
No current signal · last broadcast 2d ago
Flights observed
1
Distinct callsigns
1
Country
-
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S AE74B9.

Callsign history 1 distinct

Callsign Airline Flights Last seen
R21237 - 1 2026-04-12

Recent flights last 1

DateFlightRouteTakeoffLandingDuration
2026-04-12 R21237 FBK → FBK Apr 12, 19:35 UTCApr 12, 19:55 UTC20m

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 22-21237 page for operator, model, and routing details .

Mode-S AE74B9 frequently asked

What is Mode-S code AE74B9?
AE74B9 is an ICAO 24-bit transponder address. Assigned to 22-21237.
Is AE74B9 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AE74B9, octal 53472271, decimal 11,433,145.
What flights does AE74B9 operate?
Mode-S AE74B9 has broadcast 1 distinct callsign, including R21237.