Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AE01A4

ICAO 24-bit transponder address

Currently assigned to 86-0377 · LEARJET 35

Hex
AE01A4
Octal
53400644
Decimal
11,403,684
Tail
86-0377
Type
LJ35
No current signal · last broadcast 1d ago
Flights observed
4
Distinct callsigns
1
Country
-
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S AE01A4.

Callsign history 1 distinct

Callsign Airline Flights Last seen
SPAR748 - 4 2026-04-13

Recent flights last 4

DateFlightRouteTakeoffLandingDuration
2026-04-13 SPAR748 - Apr 13, 19:50 UTCApr 13, 20:30 UTC40m
2026-04-13 SPAR748 - Apr 13, 19:20 UTCApr 13, 20:10 UTC50m
2026-04-13 SPAR748 COS → LAW Apr 13, 17:25 UTCApr 13, 18:30 UTC1h 5m
2026-04-12 SPAR748 - Apr 12, 17:15 UTCApr 12, 19:50 UTC2h 35m

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 86-0377 page for operator, model, and routing details .

Mode-S AE01A4 frequently asked

What is Mode-S code AE01A4?
AE01A4 is an ICAO 24-bit transponder address. Assigned to 86-0377.
Is AE01A4 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 AE01A4, octal 53400644, decimal 11,403,684.
What flights does AE01A4 operate?
Mode-S AE01A4 has broadcast 1 distinct callsign, including SPAR748.