Apparatus

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sensors Mode-S transponder

AA4535

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N76091 · CESSNA 172 Skyhawk · operated by RIVERSIDE FLIGHT ACADEMY INC

Hex
AA4535
Octal
52442465
Decimal
11,158,837
Country
US
Tail
N76091
Type
C172
No current signal · last broadcast 1d ago
Flights observed
10
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S AA4535.

Country allocation

The ICAO 24-bit address AA4535 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
N76091 - 10 2026-04-13

Recent flights last 10

DateFlightRouteTakeoffLandingDuration
2026-04-13 N76091 - Apr 13, 21:35 UTCApr 13, 23:00 UTC1h 25m
2026-04-13 N76091 - Apr 13, 19:45 UTCApr 13, 20:10 UTC25m
2026-04-13 N76091 RAL → RAL Apr 13, 18:45 UTCApr 13, 18:55 UTC10m
2026-04-13 N76091 RAL → RAL Apr 13, 18:25 UTCApr 13, 18:35 UTC10m
2026-04-13 N76091 RAL → RAL Apr 13, 18:05 UTCApr 13, 18:20 UTC15m
2026-04-13 N76091 RAL → RAL Apr 13, 17:50 UTCApr 13, 17:55 UTC5m
2026-04-13 N76091 RAL → RAL Apr 13, 16:15 UTCApr 13, 16:50 UTC35m
2026-04-13 N76091 RAL → RAL Apr 13, 16:05 UTCApr 13, 16:15 UTC10m
2026-04-13 N76091 - Apr 13, 00:20 UTCApr 13, 01:30 UTC1h 10m
2026-04-13 N76091 RAL → RAL Apr 13, 00:10 UTCApr 13, 01:30 UTC1h 20m

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 N76091 page for operator, model, and routing details .

Mode-S AA4535 frequently asked

What is Mode-S code AA4535?
AA4535 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N76091.
Where is Mode-S AA4535 registered?
Mode-S code AA4535 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is AA4535 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 AA4535, octal 52442465, decimal 11,158,837.
What flights does AA4535 operate?
Mode-S AA4535 has broadcast 1 distinct callsign, including N76091.