Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AFEFFC

ICAO 24-bit transponder address

Hex
AFEFFC
Octal
53767774
Decimal
11,530,236
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 AFEFFC.

Callsign history 2 distinct

Callsign Airline Flights Last seen
HOBO71 - 1 2026-05-04
HOBO61 - 1 2026-05-07

Recent flights last 2

DateFlightRouteTakeoffLandingDuration
2026-05-07 HOBO61 - May 7, 19:30 UTCMay 7, 21:15 UTC1h 45m
2026-05-04 HOBO71 - May 4, 17:50 UTCMay 4, 18:50 UTC1h 1m

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 AFEFFC frequently asked

What is Mode-S code AFEFFC?
AFEFFC is an ICAO 24-bit transponder address.
Is AFEFFC 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 AFEFFC, octal 53767774, decimal 11,530,236.
What flights does AFEFFC operate?
Mode-S AFEFFC has broadcast 2 distinct callsigns, including HOBO71, HOBO61.