Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AF4F35

ICAO 24-bit transponder address

Hex
AF4F35
Octal
53647465
Decimal
11,489,077
No current signal · last broadcast 1d ago
Flights observed
2
Distinct callsigns
1
Country
-
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S AF4F35.

Callsign history 1 distinct

Callsign Airline Flights Last seen
12345678 - 2 2026-04-13

Recent flights last 2

DateFlightRouteTakeoffLandingDuration
2026-04-13 12345678 NEL → NEL Apr 13, 17:00 UTCApr 13, 17:20 UTC20m
2026-04-13 12345678 - Apr 13, 14:00 UTCApr 13, 14:25 UTC25m

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.

Mode-S AF4F35 frequently asked

What is Mode-S code AF4F35?
AF4F35 is an ICAO 24-bit transponder address.
Is AF4F35 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 AF4F35, octal 53647465, decimal 11,489,077.
What flights does AF4F35 operate?
Mode-S AF4F35 has broadcast 1 distinct callsign, including 12345678.