sensors Mode-S transponder

4CC539

ICAO 24-bit transponder address

Currently assigned to TF-MYB · BEECH 200 Super King Air

Hex
4CC539
Octal
23142471
Decimal
5,031,225
Tail
TF-MYB
Type
BE20
No current signal · last broadcast 12h ago
Flights observed
7
Distinct callsigns
6
Country
-
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S 4CC539.

Callsign history 6 distinct

Callsign Airline Flights Last seen
FNA570 - 2 2026-04-14
FNA591 - 1 2026-04-13
FNA590 - 1 2026-04-13
FNA575 - 1 2026-04-14
FNA574 - 1 2026-04-14
FNA571 - 1 2026-04-13

Recent flights last 7

DateFlightRouteTakeoffLandingDuration
2026-04-14 FNA570 - Apr 14, 10:05 UTCApr 14, 10:25 UTC20m
2026-04-14 FNA575 - Apr 14, 09:35 UTCApr 14, 09:45 UTC10m
2026-04-14 FNA574 - Apr 14, 08:30 UTCApr 14, 08:45 UTC15m
2026-04-13 FNA571 - Apr 13, 11:20 UTCApr 13, 11:40 UTC20m
2026-04-13 FNA570 - Apr 13, 10:05 UTCApr 13, 10:25 UTC20m
2026-04-13 FNA591 - Apr 13, 09:10 UTCApr 13, 09:20 UTC10m
2026-04-13 FNA590 - Apr 13, 08:20 UTCApr 13, 08:30 UTC10m

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 TF-MYB page for operator, model, and routing details .

Mode-S 4CC539 frequently asked

What is Mode-S code 4CC539?
4CC539 is an ICAO 24-bit transponder address. Assigned to TF-MYB.
Is 4CC539 broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CC539, octal 23142471, decimal 5,031,225.
What flights does 4CC539 operate?
Mode-S 4CC539 has broadcast 6 distinct callsigns, including FNA570, FNA591, FNA590, FNA575, FNA574.