Apparatus

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sensors Mode-S transponder

AE4D51

ICAO 24-bit transponder address

Currently assigned to 168571 · SIKORSKY UH-60 Black Hawk

Hex
AE4D51
Octal
53446521
Decimal
11,423,057
Tail
168571
Type
H60
No current signal · last broadcast Jul 24, 01:25 UTC
Flights observed
11
Distinct callsigns
2
Country
-
Last broadcast
Jul 24, 01:25 UTC

Last known position

Most recent position reported by Mode-S AE4D51.

Callsign history 2 distinct

Callsign Airline Flights Last seen
IN610 - 9 2026-07-23
IN614 - 2 2026-07-21

Recent flights last 11

DateFlightRouteTakeoffLandingDuration
2026-07-23 IN610 NZY → NZY Jul 23, 23:25 UTCJul 24, 01:25 UTC2h 0m
2026-07-21 IN614 NZY → NZY Jul 21, 22:50 UTCJul 22, 01:00 UTC2h 10m
2026-07-21 IN614 - Jul 21, 21:15 UTCJul 21, 22:30 UTC1h 15m
2026-07-18 IN610 - Jul 18, 20:35 UTCJul 18, 20:55 UTC20m
2026-07-18 IN610 - Jul 18, 17:35 UTCJul 18, 18:45 UTC1h 10m
2026-07-14 IN610 - Jul 14, 15:00 UTCJul 14, 15:35 UTC35m
2026-07-14 IN610 - Jul 14, 12:40 UTCJul 14, 13:35 UTC55m
2026-07-09 IN610 - Jul 9, 12:15 UTCJul 9, 12:25 UTC10m
2026-07-09 IN610 - Jul 9, 11:25 UTCJul 9, 11:40 UTC15m
2026-07-08 IN610 - Jul 8, 15:45 UTCJul 8, 15:55 UTC10m
2026-07-07 IN610 - Jul 7, 16:30 UTCJul 7, 17:25 UTC55m

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 168571 page for operator, model, and routing details .

Mode-S AE4D51 frequently asked

What is Mode-S code AE4D51?
AE4D51 is an ICAO 24-bit transponder address. Assigned to 168571.
Is AE4D51 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 01:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AE4D51, octal 53446521, decimal 11,423,057.
What flights does AE4D51 operate?
Mode-S AE4D51 has broadcast 2 distinct callsigns, including IN610, IN614.