Apparatus

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sensors Mode-S transponder

44020B

ICAO 24-bit transponder address · allocated to Austria

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

Hex
44020B
Octal
21001013
Decimal
4,456,971
Country
AT
Tail
OE-HGL
Type
CL35
Broadcasting now · callsign GCK29 · 39,975 ft
Flights observed
173
Distinct callsigns
2
Country
AT
Last broadcast
1h ago

Current position

44020B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 44020B 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
GCK29 - 168 2026-07-14
GCK029 - 5 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 GCK29 NCE → ATH Jul 14, 08:00 UTCJul 14, 10:00 UTC2h 0m
2026-07-13 GCK29 ATH → NCE Jul 13, 16:15 UTCJul 13, 18:30 UTC2h 15m
2026-07-13 GCK29 NCE → ATH Jul 13, 13:00 UTCJul 13, 14:50 UTC1h 50m
2026-07-13 GCK29 VIE → NCE Jul 13, 09:25 UTCJul 13, 10:50 UTC1h 25m
2026-07-13 GCK29 - Jul 13, 05:01 UTCJul 13, 05:25 UTC25m
2026-07-10 GCK29 - Jul 10, 16:55 UTCJul 10, 17:40 UTC45m
2026-07-10 GCK29 - Jul 10, 14:50 UTCJul 10, 16:30 UTC1h 40m
2026-07-10 GCK29 - Jul 10, 07:00 UTCJul 10, 08:20 UTC1h 20m
2026-07-09 GCK29 - Jul 9, 17:10 UTCJul 9, 18:25 UTC1h 15m
2026-07-09 GCK29 - Jul 9, 14:05 UTCJul 9, 15:15 UTC1h 10m
2026-07-08 GCK29 - Jul 8, 14:05 UTCJul 8, 16:30 UTC2h 25m
2026-07-08 GCK29 - Jul 8, 10:30 UTCJul 8, 11:35 UTC1h 5m
2026-07-08 GCK29 - Jul 8, 08:05 UTCJul 8, 09:20 UTC1h 15m
2026-07-07 GCK29 - Jul 7, 09:05 UTCJul 7, 10:10 UTC1h 5m
2026-07-07 GCK29 - Jul 7, 06:55 UTCJul 7, 08:05 UTC1h 10m
2026-07-06 GCK29 - Jul 6, 11:40 UTCJul 6, 12:15 UTC35m
2026-07-06 GCK29 FAB → PSA Jul 6, 09:15 UTCJul 6, 10:50 UTC1h 35m
2026-07-05 GCK29 - Jul 5, 16:05 UTCJul 5, 16:55 UTC50m
2026-07-05 GCK29 - Jul 5, 12:55 UTCJul 5, 14:05 UTC1h 10m
2026-07-05 GCK29 - Jul 5, 09:25 UTCJul 5, 10:25 UTC1h 0m
2026-07-04 GCK29 - Jul 4, 10:15 UTCJul 4, 11:10 UTC55m
2026-07-04 GCK29 - Jul 4, 07:40 UTCJul 4, 09:25 UTC1h 45m
2026-07-04 GCK29 KLU → INN Jul 4, 05:55 UTCJul 4, 06:20 UTC25m
2026-07-03 GCK29 - Jul 3, 11:25 UTCJul 3, 11:55 UTC30m
2026-07-03 GCK29 - Jul 3, 09:50 UTCJul 3, 10:30 UTC40m
2026-07-03 GCK29 - Jul 3, 07:05 UTCJul 3, 07:35 UTC30m
2026-07-02 GCK29 - Jul 2, 13:30 UTCJul 2, 14:25 UTC55m
2026-07-02 GCK29 - Jul 2, 11:35 UTCJul 2, 12:25 UTC50m
2026-07-01 GCK29 - Jul 1, 15:50 UTCJul 1, 17:50 UTC2h 0m
2026-07-01 GCK29 - Jul 1, 11:45 UTCJul 1, 14:20 UTC2h 35m
2026-07-01 GCK29 - Jul 1, 08:55 UTCJul 1, 10:05 UTC1h 10m
2026-07-01 GCK29 NCE → CDG Jul 1, 06:35 UTCJul 1, 07:45 UTC1h 10m
2026-06-30 GCK29 - Jun 30, 13:05 UTCJun 30, 14:40 UTC1h 35m
2026-06-30 GCK29 - Jun 30, 05:50 UTCJun 30, 09:15 UTC3h 25m
2026-06-28 GCK29 - Jun 28, 12:25 UTCJun 28, 15:09 UTC2h 45m
2026-06-28 GCK29 - Jun 28, 09:55 UTCJun 28, 11:19 UTC1h 25m
2026-06-27 GCK029 - Jun 27, 13:30 UTCJun 27, 14:20 UTC50m
2026-06-27 GCK029 IBZ → MAD Jun 27, 11:39 UTCJun 27, 12:39 UTC1h 0m
2026-06-27 GCK029 BCN → IBZ Jun 27, 09:19 UTCJun 27, 10:00 UTC40m
2026-06-26 GCK29 - Jun 26, 11:40 UTCJun 26, 13:19 UTC1h 40m
2026-06-26 GCK29 - Jun 26, 09:35 UTCJun 26, 10:30 UTC55m
2026-06-26 GCK29 - Jun 26, 06:54 UTCJun 26, 08:00 UTC1h 5m
2026-06-25 GCK29 - Jun 25, 17:05 UTCJun 25, 18:04 UTC1h 0m
2026-06-25 GCK29 LIN → OLB Jun 25, 15:44 UTCJun 25, 16:39 UTC55m
2026-06-25 GCK29 - Jun 25, 11:35 UTCJun 25, 12:15 UTC40m
2026-06-25 GCK29 - Jun 25, 09:55 UTCJun 25, 10:39 UTC45m
2026-06-24 GCK29 - Jun 24, 13:40 UTCJun 24, 14:45 UTC1h 5m
2026-06-24 GCK29 MLA → AVN Jun 24, 09:05 UTCJun 24, 10:45 UTC1h 40m
2026-06-23 GCK29 ATH → MLA Jun 23, 09:24 UTCJun 23, 10:44 UTC1h 20m
2026-06-23 GCK29 - Jun 23, 07:19 UTCJun 23, 07:55 UTC35m

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

Mode-S 44020B frequently asked

What is Mode-S code 44020B?
44020B is an ICAO 24-bit transponder address. Allocated to Austria. Assigned to OE-HGL.
Where is Mode-S 44020B registered?
Mode-S code 44020B is allocated to Austria (AT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 44020B broadcasting right now?
Yes. Mode-S 44020B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 44020B, octal 21001013, decimal 4,456,971.
What flights does 44020B operate?
Mode-S 44020B has broadcast 2 distinct callsigns, including GCK29, GCK029.