Apparatus

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sensors Mode-S transponder

AE511F

ICAO 24-bit transponder address

Currently assigned to 10-20309 · SIKORSKY UH-60 Black Hawk

Hex
AE511F
Octal
53450437
Decimal
11,424,031
Tail
10-20309
Type
H60
No current signal · last broadcast 14d ago
Flights observed
4
Distinct callsigns
2
Country
-
Last broadcast
14d ago

Last known position

Most recent position reported by Mode-S AE511F.

Callsign history 2 distinct

Callsign Airline Flights Last seen
CROSS77 - 2 2026-06-12
CROSS62 - 2 2026-06-01

Recent flights last 4

DateFlightRouteTakeoffLandingDuration
2026-06-12 CROSS77 - Jun 12, 20:20 UTCJun 12, 22:25 UTC2h 5m
2026-06-12 CROSS77 - Jun 12, 16:25 UTCJun 12, 18:05 UTC1h 40m
2026-06-01 CROSS62 - Jun 1, 11:15 UTCJun 1, 11:25 UTC10m
2026-06-01 CROSS62 - Jun 1, 09:10 UTCJun 1, 09:40 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 10-20309 page for operator, model, and routing details .

Mode-S AE511F frequently asked

What is Mode-S code AE511F?
AE511F is an ICAO 24-bit transponder address. Assigned to 10-20309.
Is AE511F broadcasting right now?
No active broadcast right now. Last signal was 14d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AE511F, octal 53450437, decimal 11,424,031.
What flights does AE511F operate?
Mode-S AE511F has broadcast 2 distinct callsigns, including CROSS77, CROSS62.