Apparatus

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sensors Mode-S transponder

4408D8

ICAO 24-bit transponder address · allocated to Austria

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

Hex
4408D8
Octal
21004330
Decimal
4,458,712
Country
AT
Tail
OE-HGG
Type
CL35
No current signal · last broadcast 13h ago
Flights observed
151
Distinct callsigns
2
Country
AT
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S 4408D8.

Country allocation

The ICAO 24-bit address 4408D8 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
GCK40 - 145 2026-07-17
GCK040 - 6 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 GCK40 - Jul 17, 12:15 UTCJul 17, 12:40 UTC25m
2026-07-17 GCK40 ATH → GVA Jul 17, 08:40 UTCJul 17, 11:10 UTC2h 30m
2026-07-16 GCK40 - Jul 16, 15:35 UTCJul 16, 17:20 UTC1h 45m
2026-07-16 GCK40 BRN → SZG Jul 16, 09:05 UTCJul 16, 09:45 UTC40m
2026-07-16 GCK40 SGE → BRN Jul 16, 07:25 UTCJul 16, 08:05 UTC40m
2026-07-15 GCK40 GWT → SGE Jul 15, 14:05 UTCJul 15, 14:50 UTC45m
2026-07-15 GCK40 - Jul 15, 11:10 UTCJul 15, 12:10 UTC1h 0m
2026-07-15 GCK40 - Jul 15, 08:55 UTCJul 15, 09:55 UTC1h 0m
2026-07-15 GCK40 STR → VIE Jul 15, 07:10 UTCJul 15, 08:00 UTC50m
2026-07-15 GCK40 - Jul 15, 04:50 UTCJul 15, 06:10 UTC1h 20m
2026-07-14 GCK40 - Jul 14, 10:05 UTCJul 14, 11:20 UTC1h 15m
2026-07-12 GCK40 - Jul 12, 07:31 UTCJul 12, 15:50 UTC8h 20m
2026-07-11 GCK40 - Jul 11, 13:50 UTCJul 11, 15:50 UTC2h 0m
2026-07-11 GCK40 - Jul 11, 11:55 UTCJul 11, 12:20 UTC25m
2026-07-11 GCK40 - Jul 11, 08:50 UTCJul 11, 10:20 UTC1h 30m
2026-07-10 GCK40 - Jul 10, 16:30 UTCJul 10, 16:50 UTC20m
2026-07-10 GCK40 PRG → VIE Jul 10, 15:20 UTCJul 10, 15:55 UTC35m
2026-07-09 GCK40 - Jul 9, 18:05 UTCJul 9, 18:20 UTC15m
2026-07-09 GCK40 - Jul 9, 16:00 UTCJul 9, 17:35 UTC1h 35m
2026-07-09 GCK40 - Jul 9, 13:00 UTCJul 9, 14:35 UTC1h 35m
2026-07-09 GCK40 - Jul 9, 09:20 UTCJul 9, 10:05 UTC45m
2026-07-09 GCK40 VIE → GVA Jul 9, 06:55 UTCJul 9, 08:15 UTC1h 20m
2026-07-08 GCK40 - Jul 8, 13:20 UTCJul 8, 16:10 UTC2h 50m
2026-07-08 GCK40 - Jul 8, 10:50 UTCJul 8, 12:35 UTC1h 45m
2026-07-06 GCK40 - Jul 6, 17:50 UTCJul 6, 19:45 UTC1h 55m
2026-07-06 GCK40 - Jul 6, 13:10 UTCJul 6, 16:15 UTC3h 5m
2026-07-04 GCK40 - Jul 4, 12:45 UTCJul 4, 15:20 UTC2h 35m
2026-07-04 GCK40 - Jul 4, 09:35 UTCJul 4, 11:50 UTC2h 15m
2026-07-04 GCK40 - Jul 4, 08:10 UTCJul 4, 08:40 UTC30m
2026-07-03 GCK40 - Jul 3, 11:35 UTCJul 3, 13:00 UTC1h 25m
2026-07-03 GCK40 - Jul 3, 08:50 UTCJul 3, 09:50 UTC1h 0m
2026-07-03 GCK40 - Jul 3, 06:45 UTCJul 3, 07:30 UTC45m
2026-07-02 GCK40 - Jul 2, 13:55 UTCJul 2, 15:10 UTC1h 15m
2026-07-02 GCK40 - Jul 2, 09:15 UTCJul 2, 12:25 UTC3h 10m
2026-06-30 GCK40 - Jun 30, 09:10 UTCJun 30, 11:55 UTC2h 45m
2026-06-29 GCK40 - Jun 29, 13:44 UTCJun 29, 14:04 UTC20m
2026-06-29 GCK40 GVA → NHT Jun 29, 11:55 UTCJun 29, 13:04 UTC1h 10m
2026-06-29 GCK40 ZRH → GVA Jun 29, 09:20 UTCJun 29, 09:54 UTC35m
2026-06-28 GCK40 - Jun 28, 16:49 UTCJun 28, 18:05 UTC1h 15m
2026-06-28 GCK40 - Jun 28, 13:55 UTCJun 28, 15:20 UTC1h 25m
2026-06-28 GCK40 - Jun 28, 10:00 UTCJun 28, 11:45 UTC1h 45m
2026-06-27 GCK40 - Jun 27, 15:10 UTCJun 27, 17:04 UTC1h 55m
2026-06-27 GCK40 - Jun 27, 11:35 UTCJun 27, 13:55 UTC2h 20m
2026-06-27 GCK40 - Jun 27, 05:44 UTCJun 27, 07:49 UTC2h 5m
2026-06-24 GCK40 ATH → VIE Jun 24, 16:45 UTCJun 24, 18:29 UTC1h 45m
2026-06-24 GCK40 - Jun 24, 12:34 UTCJun 24, 15:44 UTC3h 10m
2026-06-23 GCK40 - Jun 23, 15:59 UTCJun 23, 16:14 UTC15m
2026-06-23 GCK040 - Jun 23, 12:29 UTCJun 23, 14:55 UTC2h 25m
2026-06-23 GCK040 - Jun 23, 09:24 UTCJun 23, 10:15 UTC50m
2026-06-23 GCK040 - Jun 23, 07:45 UTCJun 23, 08:35 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-HGG page for operator, model, and routing details .

Mode-S 4408D8 frequently asked

What is Mode-S code 4408D8?
4408D8 is an ICAO 24-bit transponder address. Allocated to Austria. Assigned to OE-HGG.
Where is Mode-S 4408D8 registered?
Mode-S code 4408D8 is allocated to Austria (AT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4408D8 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4408D8, octal 21004330, decimal 4,458,712.
What flights does 4408D8 operate?
Mode-S 4408D8 has broadcast 2 distinct callsigns, including GCK40, GCK040.