Apparatus

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sensors Mode-S transponder

440B49

ICAO 24-bit transponder address · allocated to Austria

Currently assigned to OE-HCU · BOMBARDIER BD-100 Challenger 350

Hex
440B49
Octal
21005511
Decimal
4,459,337
Country
AT
Tail
OE-HCU
Type
CL35
No current signal · last broadcast 15h ago
Flights observed
124
Distinct callsigns
3
Country
AT
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 440B49.

Country allocation

The ICAO 24-bit address 440B49 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 3 distinct

Callsign Airline Flights Last seen
LDX12C - 100 2026-07-17
LDX12 - 22 2026-07-04
BCS427 European Air Transport 1 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 LDX12C - Jul 17, 10:15 UTCJul 17, 11:10 UTC55m
2026-07-17 LDX12C - Jul 17, 08:20 UTCJul 17, 09:10 UTC50m
2026-07-16 LDX12C - Jul 16, 13:49 UTCJul 16, 14:15 UTC25m
2026-07-16 LDX12C - Jul 16, 12:40 UTCJul 16, 13:20 UTC40m
2026-07-16 LDX12C GRZ → FMM Jul 16, 04:10 UTCJul 16, 04:50 UTC40m
2026-07-15 LDX12C - Jul 15, 15:45 UTCJul 15, 16:10 UTC25m
2026-07-15 LDX12C - Jul 15, 14:05 UTCJul 15, 15:05 UTC1h 0m
2026-07-15 LDX12C - Jul 15, 11:55 UTCJul 15, 12:35 UTC40m
2026-07-14 LDX12C - Jul 14, 15:45 UTCJul 14, 16:20 UTC35m
2026-07-14 LDX12C - Jul 14, 08:40 UTCJul 14, 09:20 UTC40m
2026-07-13 LDX12C - Jul 13, 16:25 UTCJul 13, 17:10 UTC45m
2026-07-13 LDX12C - Jul 13, 13:35 UTCJul 13, 15:25 UTC1h 50m
2026-07-13 LDX12C VIE → MUC Jul 13, 11:00 UTCJul 13, 11:45 UTC45m
2026-07-12 LDX12C - Jul 12, 06:01 UTCJul 12, 14:30 UTC8h 30m
2026-07-10 LDX12C - Jul 10, 14:50 UTCJul 10, 15:50 UTC1h 0m
2026-07-10 LDX12C VIE → MUC Jul 10, 12:25 UTCJul 10, 13:05 UTC40m
2026-07-09 LDX12C NCE → VIE Jul 9, 12:05 UTCJul 9, 13:25 UTC1h 20m
2026-07-09 LDX12C - Jul 9, 09:40 UTCJul 9, 11:05 UTC1h 25m
2026-07-09 LDX12C - Jul 9, 04:15 UTCJul 9, 05:05 UTC50m
2026-07-07 LDX12C LNZ → GVA Jul 7, 10:50 UTCJul 7, 12:00 UTC1h 10m
2026-07-06 LDX12C - Jul 6, 15:10 UTCJul 6, 16:20 UTC1h 10m
2026-07-06 LDX12C VIE → TLN Jul 6, 12:15 UTCJul 6, 13:45 UTC1h 30m
2026-07-05 LDX12C - Jul 5, 15:05 UTCJul 5, 17:30 UTC2h 25m
2026-07-05 LDX12C - Jul 5, 11:00 UTCJul 5, 12:55 UTC1h 55m
2026-07-04 LDX12 GRZ → VIE Jul 4, 13:15 UTCJul 4, 13:35 UTC20m
2026-07-04 LDX12 - Jul 4, 11:20 UTCJul 4, 12:15 UTC55m
2026-07-04 LDX12 - Jul 4, 09:35 UTCJul 4, 10:05 UTC30m
2026-07-03 LDX12C - Jul 3, 13:05 UTCJul 3, 13:35 UTC30m
2026-07-03 LDX12C - Jul 3, 11:10 UTCJul 3, 11:45 UTC35m
2026-07-03 LDX12C - Jul 3, 08:35 UTCJul 3, 09:25 UTC50m
2026-07-01 LDX12 - Jul 1, 15:15 UTCJul 1, 15:45 UTC30m
2026-07-01 LDX12 - Jul 1, 13:00 UTCJul 1, 14:05 UTC1h 5m
2026-06-30 LDX12 - Jun 30, 16:45 UTCJun 30, 17:50 UTC1h 5m
2026-06-30 LDX12C - Jun 30, 14:05 UTCJun 30, 15:40 UTC1h 35m
2026-06-29 LDX12C - Jun 29, 07:55 UTCJun 29, 09:54 UTC2h 0m
2026-06-28 LDX12C - Jun 28, 15:40 UTCJun 28, 17:34 UTC1h 55m
2026-06-28 LDX12C - Jun 28, 13:00 UTCJun 28, 14:14 UTC1h 15m
2026-06-27 LDX12C - Jun 27, 12:45 UTCJun 27, 13:24 UTC40m
2026-06-27 LDX12 - Jun 27, 09:24 UTCJun 27, 10:25 UTC1h 0m
2026-06-26 LDX12C - Jun 26, 14:55 UTCJun 26, 16:05 UTC1h 10m
2026-06-26 LDX12C - Jun 26, 12:34 UTCJun 26, 13:30 UTC55m
2026-06-26 LDX12C VIE → BLQ Jun 26, 09:50 UTCJun 26, 10:44 UTC55m
2026-06-25 LDX12C POZ → VIE Jun 25, 14:59 UTCJun 25, 15:44 UTC45m
2026-06-25 LDX12C - Jun 25, 13:00 UTCJun 25, 14:09 UTC1h 10m
2026-06-22 LDX12C POZ → STR Jun 22, 06:15 UTCJun 22, 07:19 UTC1h 5m
2026-06-22 LDX12C VIE → POZ Jun 22, 03:54 UTCJun 22, 04:44 UTC50m
2026-06-20 LDX12C VIE → VIE Jun 20, 07:19 UTCJun 20, 16:59 UTC9h 40m
2026-06-18 LDX12C - Jun 18, 15:40 UTCJun 18, 16:50 UTC1h 10m
2026-06-18 LDX12C - Jun 18, 12:45 UTCJun 18, 14:30 UTC1h 45m
2026-06-18 LDX12C - Jun 18, 09:50 UTCJun 18, 10:40 UTC50m

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

Mode-S 440B49 frequently asked

What is Mode-S code 440B49?
440B49 is an ICAO 24-bit transponder address. Allocated to Austria. Assigned to OE-HCU.
Where is Mode-S 440B49 registered?
Mode-S code 440B49 is allocated to Austria (AT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 440B49 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 440B49, octal 21005511, decimal 4,459,337.
What flights does 440B49 operate?
Mode-S 440B49 has broadcast 3 distinct callsigns, including LDX12C, LDX12, BCS427.