Apparatus

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sensors Mode-S transponder

4CC4D1

ICAO 24-bit transponder address

Currently assigned to TF-FXI · DE HAVILLAND DHC-8-400 Dash 8

Hex
4CC4D1
Octal
23142321
Decimal
5,031,121
Tail
TF-FXI
Type
DH8D
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 4CC4D1.

Callsign history 2 distinct

Callsign Airline Flights Last seen
ICE301 - 1 2026-04-13
ICE300 Icelandair 1 2026-04-13

Recent flights last 2

DateFlightRouteTakeoffLandingDuration
2026-04-13 ICE301 - Apr 13, 14:15 UTCApr 13, 14:40 UTC25m
2026-04-13 ICE300 KEF → FAE Apr 13, 10:45 UTCApr 13, 11:15 UTC30m

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-FXI page for operator, model, and routing details .

Mode-S 4CC4D1 frequently asked

What is Mode-S code 4CC4D1?
4CC4D1 is an ICAO 24-bit transponder address. Assigned to TF-FXI.
Is 4CC4D1 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 4CC4D1, octal 23142321, decimal 5,031,121.
What flights does 4CC4D1 operate?
Mode-S 4CC4D1 has broadcast 2 distinct callsigns, including ICE301, ICE300.