Apparatus

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sensors Mode-S transponder

44B664

ICAO 24-bit transponder address · allocated to Belgium

Currently assigned to OO-MSD

Hex
44B664
Octal
21133144
Decimal
4,503,140
Country
BE
Tail
OO-MSD
Type
DA62
No current signal · last broadcast 10h ago
Flights observed
72
Distinct callsigns
2
Country
BE
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 44B664.

Country allocation

The ICAO 24-bit address 44B664 falls within the block assigned to Belgium (BE) by ICAO Annex 10, Volume III. Every aircraft registered in Belgium 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
OSPREY4 - 69 2026-07-17
OOMSD - 3 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 OSPREY4 - Jul 17, 12:15 UTCJul 17, 16:40 UTC4h 25m
2026-07-16 OSPREY4 - Jul 16, 12:14 UTCJul 16, 16:40 UTC4h 25m
2026-07-12 OSPREY4 - Jul 12, 07:45 UTCJul 12, 12:10 UTC4h 25m
2026-07-11 OSPREY4 - Jul 11, 13:05 UTCJul 11, 17:30 UTC4h 25m
2026-07-10 OSPREY4 - Jul 10, 12:55 UTCJul 10, 17:25 UTC4h 30m
2026-07-09 OSPREY4 - Jul 9, 07:35 UTCJul 9, 11:55 UTC4h 20m
2026-07-07 OSPREY4 - Jul 7, 07:35 UTCJul 7, 12:05 UTC4h 30m
2026-07-06 OSPREY4 - Jul 6, 07:30 UTCJul 6, 11:55 UTC4h 25m
2026-07-05 OSPREY4 - Jul 5, 13:00 UTCJul 5, 17:00 UTC4h 0m
2026-07-04 OSPREY4 - Jul 4, 07:10 UTCJul 4, 11:05 UTC3h 55m
2026-07-03 OSPREY4 - Jul 3, 07:05 UTCJul 3, 11:00 UTC3h 55m
2026-06-29 OSPREY4 - Jun 29, 07:05 UTCJun 29, 11:04 UTC4h 0m
2026-06-28 OSPREY4 - Jun 28, 06:59 UTCJun 28, 11:09 UTC4h 10m
2026-06-27 OSPREY4 - Jun 27, 13:00 UTCJun 27, 16:59 UTC4h 0m
2026-06-25 OSPREY4 - Jun 25, 07:05 UTCJun 25, 11:10 UTC4h 5m
2026-06-24 OSPREY4 - Jun 24, 13:00 UTCJun 24, 17:10 UTC4h 10m
2026-06-23 OSPREY4 - Jun 23, 06:59 UTCJun 23, 10:49 UTC3h 50m
2026-06-22 OSPREY4 - Jun 22, 07:00 UTCJun 22, 10:19 UTC3h 20m
2026-06-21 OSPREY4 - Jun 21, 06:04 UTCJun 21, 10:04 UTC4h 0m
2026-06-20 OSPREY4 - Jun 20, 12:59 UTCJun 20, 15:09 UTC2h 10m
2026-06-18 OSPREY4 - Jun 18, 14:25 UTCJun 18, 17:05 UTC2h 40m
2026-06-18 OSPREY4 - Jun 18, 13:05 UTCJun 18, 13:55 UTC50m
2026-06-17 OSPREY4 - Jun 17, 16:35 UTCJun 17, 18:40 UTC2h 5m
2026-06-17 OSPREY4 - Jun 17, 14:40 UTCJun 17, 15:55 UTC1h 15m
2026-06-15 OSPREY4 - Jun 15, 07:10 UTCJun 15, 11:54 UTC4h 45m
2026-06-13 OSPREY4 - Jun 13, 08:10 UTCJun 13, 12:05 UTC3h 55m
2026-06-11 OSPREY4 - Jun 11, 14:20 UTCJun 11, 16:55 UTC2h 35m
2026-06-11 OSPREY4 - Jun 11, 13:05 UTCJun 11, 13:45 UTC40m
2026-06-10 OSPREY4 - Jun 10, 12:15 UTCJun 10, 16:05 UTC3h 50m
2026-06-09 OSPREY4 - Jun 9, 16:45 UTCJun 9, 18:45 UTC2h 0m
2026-06-09 OSPREY4 - Jun 9, 14:10 UTCJun 9, 15:50 UTC1h 40m
2026-06-08 OSPREY4 - Jun 8, 08:15 UTCJun 8, 12:00 UTC3h 45m
2026-06-04 OSPREY4 - Jun 4, 13:10 UTCJun 4, 17:10 UTC4h 0m
2026-06-03 OSPREY4 - Jun 3, 07:05 UTCJun 3, 10:55 UTC3h 50m
2026-06-02 OSPREY4 - Jun 2, 08:10 UTCJun 2, 12:00 UTC3h 50m
2026-06-01 OSPREY4 - Jun 1, 07:05 UTCJun 1, 11:05 UTC4h 0m
2026-05-31 OSPREY4 - May 31, 11:00 UTCMay 31, 15:00 UTC4h 0m
2026-05-30 OSPREY4 - May 30, 09:00 UTCMay 30, 13:00 UTC4h 0m
2026-05-28 OSPREY4 - May 28, 08:00 UTCMay 28, 12:10 UTC4h 10m
2026-05-27 OSPREY4 - May 27, 11:10 UTCMay 27, 15:25 UTC4h 15m
2026-05-24 OSPREY4 - May 24, 08:00 UTCMay 24, 12:05 UTC4h 5m
2026-05-23 OOMSD - May 23, 13:05 UTCMay 23, 16:50 UTC3h 45m
2026-05-22 OOMSD - May 22, 10:50 UTCMay 22, 13:55 UTC3h 5m
2026-05-19 OOMSD - May 19, 04:45 UTCMay 19, 06:50 UTC2h 5m
2026-05-18 OSPREY4 - May 18, 12:00 UTCMay 18, 15:55 UTC3h 55m
2026-05-17 OSPREY4 - May 17, 08:05 UTCMay 17, 11:55 UTC3h 50m
2026-05-16 OSPREY4 - May 16, 08:05 UTCMay 16, 11:51 UTC3h 45m
2026-05-15 OSPREY4 - May 15, 13:05 UTCMay 15, 17:00 UTC3h 54m
2026-05-13 OSPREY4 - May 13, 13:05 UTCMay 13, 17:00 UTC3h 55m
2026-05-11 OSPREY4 - May 11, 08:05 UTCMay 11, 11:50 UTC3h 45m

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 OO-MSD page for operator, model, and routing details .

Mode-S 44B664 frequently asked

What is Mode-S code 44B664?
44B664 is an ICAO 24-bit transponder address. Allocated to Belgium. Assigned to OO-MSD.
Where is Mode-S 44B664 registered?
Mode-S code 44B664 is allocated to Belgium (BE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 44B664 broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 44B664, octal 21133144, decimal 4,503,140.
What flights does 44B664 operate?
Mode-S 44B664 has broadcast 2 distinct callsigns, including OSPREY4, OOMSD.