Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AE4840

ICAO 24-bit transponder address

Currently assigned to 08-20111 · SIKORSKY UH-60 Black Hawk

Hex
AE4840
Octal
53444100
Decimal
11,421,760
Tail
08-20111
Type
H60
No current signal · last broadcast 1d ago
Flights observed
4
Distinct callsigns
2
Country
-
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S AE4840.

Callsign history 2 distinct

Callsign Airline Flights Last seen
PAT15 - 2 2026-04-17
PAT12 - 2 2026-04-14

Recent flights last 4

DateFlightRouteTakeoffLandingDuration
2026-04-17 PAT15 - Apr 17, 13:20 UTCApr 17, 14:45 UTC1h 25m
2026-04-17 PAT15 - Apr 17, 13:05 UTCApr 17, 13:15 UTC10m
2026-04-14 PAT12 - Apr 14, 14:50 UTCApr 14, 15:00 UTC10m
2026-04-14 PAT12 - Apr 14, 13:05 UTCApr 14, 14:45 UTC1h 40m

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 08-20111 page for operator, model, and routing details .

Mode-S AE4840 frequently asked

What is Mode-S code AE4840?
AE4840 is an ICAO 24-bit transponder address. Assigned to 08-20111.
Is AE4840 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 AE4840, octal 53444100, decimal 11,421,760.
What flights does AE4840 operate?
Mode-S AE4840 has broadcast 2 distinct callsigns, including PAT15, PAT12.