Apparatus

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sensors Mode-S transponder

AE6405

ICAO 24-bit transponder address

Currently assigned to 63-8215 · Northrop T-38A Talon

Hex
AE6405
Octal
53462005
Decimal
11,428,869
Tail
63-8215
Type
T38
No current signal · last broadcast 1d ago
Flights observed
2
Distinct callsigns
2
Country
-
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S AE6405.

Callsign history 2 distinct

Callsign Airline Flights Last seen
RO02 - 1 2026-04-13
KT01 - 1 2026-04-13

Recent flights last 2

DateFlightRouteTakeoffLandingDuration
2026-04-13 RO02 - Apr 13, 21:10 UTCApr 13, 22:15 UTC1h 5m
2026-04-13 KT01 - Apr 13, 18:40 UTCApr 13, 19:45 UTC1h 5m

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 63-8215 page for operator, model, and routing details .

Mode-S AE6405 frequently asked

What is Mode-S code AE6405?
AE6405 is an ICAO 24-bit transponder address. Assigned to 63-8215.
Is AE6405 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 AE6405, octal 53462005, decimal 11,428,869.
What flights does AE6405 operate?
Mode-S AE6405 has broadcast 2 distinct callsigns, including RO02, KT01.