Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AE21DE

ICAO 24-bit transponder address

Currently assigned to 24662 · SIKORSKY UH-60 Black Hawk

Hex
AE21DE
Octal
53420736
Decimal
11,411,934
Tail
24662
Type
H60
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 AE21DE.

Callsign history 1 distinct

Callsign Airline Flights Last seen
TSTR60 - 2 2026-04-13

Recent flights last 2

DateFlightRouteTakeoffLandingDuration
2026-04-13 TSTR60 - Apr 13, 21:10 UTCApr 13, 21:30 UTC20m
2026-04-13 TSTR60 - Apr 13, 18:35 UTCApr 13, 19:20 UTC45m

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 24662 page for operator, model, and routing details .

Mode-S AE21DE frequently asked

What is Mode-S code AE21DE?
AE21DE is an ICAO 24-bit transponder address. Assigned to 24662.
Is AE21DE 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 AE21DE, octal 53420736, decimal 11,411,934.
What flights does AE21DE operate?
Mode-S AE21DE has broadcast 1 distinct callsign, including TSTR60.