sensors Mode-S transponder

AE621D

ICAO 24-bit transponder address

Currently assigned to 18-21017 · SIKORSKY UH-60 Black Hawk

Hex
AE621D
Octal
53461035
Decimal
11,428,381
Tail
18-21017
Type
H60
No current signal · last broadcast 1d ago
Flights observed
6
Distinct callsigns
1
Country
-
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S AE621D.

Callsign history 1 distinct

Callsign Airline Flights Last seen
DRAGO00 - 6 2026-04-13

Recent flights last 6

DateFlightRouteTakeoffLandingDuration
2026-04-13 DRAGO00 - Apr 13, 13:20 UTCApr 13, 14:40 UTC1h 20m
2026-04-13 DRAGO00 - Apr 13, 12:20 UTCApr 13, 12:55 UTC35m
2026-04-13 DRAGO00 - Apr 13, 11:55 UTCApr 13, 12:55 UTC1h 0m
2026-04-13 DRAGO00 - Apr 13, 11:30 UTCApr 13, 12:15 UTC45m
2026-04-13 DRAGO00 - Apr 13, 11:05 UTCApr 13, 11:20 UTC15m
2026-04-13 DRAGO00 - Apr 13, 09:30 UTCApr 13, 09:50 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 18-21017 page for operator, model, and routing details .

Mode-S AE621D frequently asked

What is Mode-S code AE621D?
AE621D is an ICAO 24-bit transponder address. Assigned to 18-21017.
Is AE621D 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 AE621D, octal 53461035, decimal 11,428,381.
What flights does AE621D operate?
Mode-S AE621D has broadcast 1 distinct callsign, including DRAGO00.