Apparatus

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sensors Mode-S transponder

4400A1

ICAO 24-bit transponder address · allocated to Austria

Currently assigned to OE-XVI · AIRBUS HELICOPTERS EC-135/635

Hex
4400A1
Octal
21000241
Decimal
4,456,609
Country
AT
Tail
OE-XVI
Type
EC35
No current signal · last broadcast 14h ago
Flights observed
473
Distinct callsigns
2
Country
AT
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S 4400A1.

Country allocation

The ICAO 24-bit address 4400A1 falls within the block assigned to Austria (AT) by ICAO Annex 10, Volume III. Every aircraft registered in Austria 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 2 distinct

Callsign Airline Flights Last seen
EUROPA3 - 472 2026-07-24
CX - 1 2026-04-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 EUROPA3 - Jul 24, 11:55 UTCJul 24, 12:15 UTC20m
2026-07-24 EUROPA3 - Jul 24, 10:25 UTCJul 24, 11:20 UTC55m
2026-07-24 EUROPA3 - Jul 24, 07:15 UTCJul 24, 09:50 UTC2h 35m
2026-07-23 EUROPA3 - Jul 23, 15:55 UTCJul 23, 17:00 UTC1h 5m
2026-07-23 EUROPA3 - Jul 23, 12:20 UTCJul 23, 14:45 UTC2h 25m
2026-07-23 EUROPA3 - Jul 23, 06:40 UTCJul 23, 07:25 UTC45m
2026-07-22 EUROPA3 - Jul 22, 18:20 UTCJul 22, 18:35 UTC15m
2026-07-22 EUROPA3 - Jul 22, 17:30 UTCJul 22, 17:45 UTC15m
2026-07-22 EUROPA3 - Jul 22, 15:45 UTCJul 22, 16:20 UTC35m
2026-07-22 EUROPA3 - Jul 22, 14:45 UTCJul 22, 15:05 UTC20m
2026-07-22 EUROPA3 - Jul 22, 13:40 UTCJul 22, 14:40 UTC1h 0m
2026-07-22 EUROPA3 - Jul 22, 11:55 UTCJul 22, 12:50 UTC55m
2026-07-21 EUROPA3 - Jul 21, 19:00 UTCJul 21, 19:40 UTC40m
2026-07-21 EUROPA3 - Jul 21, 16:15 UTCJul 21, 16:45 UTC30m
2026-07-21 EUROPA3 - Jul 21, 12:35 UTCJul 21, 13:05 UTC30m
2026-07-21 EUROPA3 - Jul 21, 11:50 UTCJul 21, 12:00 UTC10m
2026-07-21 EUROPA3 - Jul 21, 09:10 UTCJul 21, 09:40 UTC30m
2026-07-21 EUROPA3 - Jul 21, 07:10 UTCJul 21, 07:40 UTC30m
2026-07-20 EUROPA3 - Jul 20, 20:10 UTCJul 20, 20:50 UTC40m
2026-07-20 EUROPA3 - Jul 20, 18:45 UTCJul 20, 19:55 UTC1h 10m
2026-07-20 EUROPA3 - Jul 20, 16:00 UTCJul 20, 17:25 UTC1h 25m
2026-07-20 EUROPA3 - Jul 20, 14:20 UTCJul 20, 15:00 UTC40m
2026-07-20 EUROPA3 - Jul 20, 11:15 UTCJul 20, 13:20 UTC2h 5m
2026-07-20 EUROPA3 - Jul 20, 08:30 UTCJul 20, 09:10 UTC40m
2026-07-20 EUROPA3 - Jul 20, 06:45 UTCJul 20, 06:55 UTC10m
2026-07-19 EUROPA3 - Jul 19, 19:20 UTCJul 19, 20:00 UTC40m
2026-07-19 EUROPA3 - Jul 19, 14:55 UTCJul 19, 16:10 UTC1h 15m
2026-07-18 EUROPA3 - Jul 18, 19:20 UTCJul 18, 19:35 UTC15m
2026-07-18 EUROPA3 - Jul 18, 16:20 UTCJul 18, 17:35 UTC1h 15m
2026-07-18 EUROPA3 - Jul 18, 15:35 UTCJul 18, 15:45 UTC10m
2026-07-18 EUROPA3 - Jul 18, 13:30 UTCJul 18, 14:10 UTC40m
2026-07-17 EUROPA3 - Jul 17, 15:44 UTCJul 17, 16:49 UTC1h 5m
2026-07-17 EUROPA3 - Jul 17, 12:55 UTCJul 17, 13:35 UTC40m
2026-07-17 EUROPA3 - Jul 17, 11:55 UTCJul 17, 12:35 UTC40m
2026-07-17 EUROPA3 - Jul 17, 11:04 UTCJul 17, 11:20 UTC15m
2026-07-17 EUROPA3 - Jul 17, 09:25 UTCJul 17, 10:30 UTC1h 5m
2026-07-17 EUROPA3 - Jul 17, 06:50 UTCJul 17, 08:10 UTC1h 20m
2026-07-17 EUROPA3 - Jul 17, 05:25 UTCJul 17, 05:39 UTC15m
2026-07-16 EUROPA3 - Jul 16, 17:25 UTCJul 16, 17:35 UTC10m
2026-07-16 EUROPA3 - Jul 16, 15:40 UTCJul 16, 15:49 UTC10m
2026-07-16 EUROPA3 - Jul 16, 13:34 UTCJul 16, 14:55 UTC1h 20m
2026-07-15 EUROPA3 - Jul 15, 17:05 UTCJul 15, 19:55 UTC2h 50m
2026-07-15 EUROPA3 - Jul 15, 15:00 UTCJul 15, 15:30 UTC30m
2026-07-15 EUROPA3 - Jul 15, 11:20 UTCJul 15, 11:30 UTC10m
2026-07-15 EUROPA3 - Jul 15, 10:50 UTCJul 15, 11:00 UTC10m
2026-07-15 EUROPA3 - Jul 15, 09:50 UTCJul 15, 10:05 UTC15m
2026-07-15 EUROPA3 - Jul 15, 09:15 UTCJul 15, 09:30 UTC15m
2026-07-15 EUROPA3 - Jul 15, 06:50 UTCJul 15, 07:20 UTC30m
2026-07-14 EUROPA3 - Jul 14, 16:55 UTCJul 14, 17:20 UTC25m
2026-07-14 EUROPA3 - Jul 14, 16:00 UTCJul 14, 16:10 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 OE-XVI page for operator, model, and routing details .

Mode-S 4400A1 frequently asked

What is Mode-S code 4400A1?
4400A1 is an ICAO 24-bit transponder address. Allocated to Austria. Assigned to OE-XVI.
Where is Mode-S 4400A1 registered?
Mode-S code 4400A1 is allocated to Austria (AT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4400A1 broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4400A1, octal 21000241, decimal 4,456,609.
What flights does 4400A1 operate?
Mode-S 4400A1 has broadcast 2 distinct callsigns, including EUROPA3, CX.