Apparatus

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sensors Mode-S transponder

AE4FDB

ICAO 24-bit transponder address

Currently assigned to 168139 · SIKORSKY UH-60 Black Hawk

Hex
AE4FDB
Octal
53447733
Decimal
11,423,707
Tail
168139
Type
H60
No current signal · last broadcast 17h ago
Flights observed
3
Distinct callsigns
1
Country
-
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S AE4FDB.

Callsign history 1 distinct

Callsign Airline Flights Last seen
SABR705 - 3 2026-04-14

Recent flights last 3

DateFlightRouteTakeoffLandingDuration
2026-04-14 SABR705 - Apr 14, 09:10 UTCApr 14, 10:30 UTC1h 20m
2026-04-14 SABR705 - Apr 14, 07:40 UTCApr 14, 09:05 UTC1h 25m
2026-04-14 SABR705 - Apr 14, 05:55 UTCApr 14, 07:05 UTC1h 10m

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 168139 page for operator, model, and routing details .

Mode-S AE4FDB frequently asked

What is Mode-S code AE4FDB?
AE4FDB is an ICAO 24-bit transponder address. Assigned to 168139.
Is AE4FDB broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AE4FDB, octal 53447733, decimal 11,423,707.
What flights does AE4FDB operate?
Mode-S AE4FDB has broadcast 1 distinct callsign, including SABR705.