Apparatus

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sensors Mode-S transponder

44B661

ICAO 24-bit transponder address · allocated to Belgium

Currently assigned to OO-MSA · DIAMOND DA-62

Hex
44B661
Octal
21133141
Decimal
4,503,137
Country
BE
Tail
OO-MSA
Type
DA62
No current signal · last broadcast 3d ago
Flights observed
118
Distinct callsigns
1
Country
BE
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 44B661.

Country allocation

The ICAO 24-bit address 44B661 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 1 distinct

Callsign Airline Flights Last seen
OOMSA - 118 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 OOMSA - Jul 10, 21:30 UTCJul 11, 01:05 UTC3h 35m
2026-07-10 OOMSA - Jul 10, 18:05 UTCJul 10, 20:35 UTC2h 30m
2026-07-10 OOMSA - Jul 10, 13:15 UTCJul 10, 13:30 UTC15m
2026-07-07 OOMSA - Jul 7, 06:15 UTCJul 7, 06:25 UTC10m
2026-07-06 OOMSA - Jul 6, 18:05 UTCJul 6, 20:40 UTC2h 35m
2026-07-03 OOMSA - Jul 3, 22:05 UTCJul 4, 01:00 UTC2h 55m
2026-07-03 OOMSA - Jul 3, 18:05 UTCJul 3, 20:30 UTC2h 25m
2026-07-03 OOMSA - Jul 3, 08:05 UTCJul 3, 09:55 UTC1h 50m
2026-07-02 OOMSA - Jul 2, 21:35 UTCJul 3, 01:00 UTC3h 25m
2026-07-02 OOMSA - Jul 2, 18:00 UTCJul 2, 20:30 UTC2h 30m
2026-07-01 OOMSA - Jul 1, 21:45 UTCJul 2, 01:05 UTC3h 20m
2026-07-01 OOMSA - Jul 1, 18:00 UTCJul 1, 20:30 UTC2h 30m
2026-06-30 OOMSA - Jun 30, 21:35 UTCJun 30, 22:10 UTC35m
2026-06-30 OOMSA - Jun 30, 18:00 UTCJun 30, 20:25 UTC2h 25m
2026-06-30 OOMSA - Jun 30, 07:00 UTCJun 30, 09:55 UTC2h 55m
2026-06-29 OOMSA - Jun 29, 21:39 UTCJun 30, 01:00 UTC3h 20m
2026-06-29 OOMSA - Jun 29, 18:05 UTCJun 29, 19:24 UTC1h 20m
2026-06-29 OOMSA - Jun 29, 14:14 UTCJun 29, 14:25 UTC10m
2026-06-29 OOMSA - Jun 29, 06:34 UTCJun 29, 06:50 UTC15m
2026-06-26 OOMSA - Jun 26, 07:05 UTCJun 26, 10:05 UTC3h 0m
2026-06-25 OOMSA - Jun 25, 21:25 UTCJun 26, 00:55 UTC3h 30m
2026-06-25 OOMSA - Jun 25, 17:54 UTCJun 25, 20:25 UTC2h 30m
2026-06-25 OOMSA - Jun 25, 07:05 UTCJun 25, 09:55 UTC2h 50m
2026-06-24 OOMSA - Jun 24, 17:55 UTCJun 24, 20:30 UTC2h 35m
2026-06-24 OOMSA - Jun 24, 07:05 UTCJun 24, 09:55 UTC2h 50m
2026-06-23 OOMSA - Jun 23, 21:34 UTCJun 24, 00:59 UTC3h 25m
2026-06-23 OOMSA - Jun 23, 17:59 UTCJun 23, 20:29 UTC2h 30m
2026-06-22 OOMSA - Jun 22, 21:59 UTCJun 23, 01:00 UTC3h 0m
2026-06-22 OOMSA - Jun 22, 18:00 UTCJun 22, 20:49 UTC2h 50m
2026-06-21 OOMSA - Jun 21, 18:00 UTCJun 21, 20:24 UTC2h 25m
2026-06-19 OOMSA - Jun 19, 21:34 UTCJun 20, 00:59 UTC3h 25m
2026-06-19 OOMSA - Jun 19, 07:04 UTCJun 19, 09:55 UTC2h 50m
2026-06-17 OOMSA - Jun 17, 18:00 UTCJun 17, 20:35 UTC2h 35m
2026-06-16 OOMSA - Jun 16, 21:35 UTCJun 17, 01:10 UTC3h 35m
2026-06-16 OOMSA - Jun 16, 17:59 UTCJun 16, 20:30 UTC2h 31m
2026-06-15 OOMSA - Jun 15, 21:45 UTCJun 16, 00:55 UTC3h 10m
2026-06-15 OOMSA - Jun 15, 18:04 UTCJun 15, 20:30 UTC2h 25m
2026-06-15 OOMSA - Jun 15, 12:05 UTCJun 15, 12:30 UTC25m
2026-06-15 OOMSA - Jun 15, 07:05 UTCJun 15, 10:00 UTC2h 55m
2026-06-14 OOMSA - Jun 14, 22:15 UTCJun 15, 01:04 UTC2h 50m
2026-06-14 OOMSA - Jun 14, 20:45 UTCJun 14, 21:05 UTC20m
2026-06-14 OOMSA - Jun 14, 19:05 UTCJun 14, 19:35 UTC30m
2026-06-14 OOMSA - Jun 14, 18:10 UTCJun 14, 18:30 UTC20m
2026-06-14 OOMSA - Jun 14, 07:10 UTCJun 14, 10:00 UTC2h 50m
2026-06-11 OOMSA - Jun 11, 15:20 UTCJun 11, 15:30 UTC10m
2026-06-10 OOMSA - Jun 10, 06:40 UTCJun 10, 07:00 UTC20m
2026-06-09 OOMSA - Jun 9, 21:40 UTCJun 10, 01:05 UTC3h 25m
2026-06-09 OOMSA - Jun 9, 18:05 UTCJun 9, 20:30 UTC2h 25m
2026-06-07 OOMSA - Jun 7, 21:40 UTCJun 8, 01:05 UTC3h 25m
2026-06-07 OOMSA - Jun 7, 18:10 UTCJun 7, 20:25 UTC2h 15m

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

Mode-S 44B661 frequently asked

What is Mode-S code 44B661?
44B661 is an ICAO 24-bit transponder address. Allocated to Belgium. Assigned to OO-MSA.
Where is Mode-S 44B661 registered?
Mode-S code 44B661 is allocated to Belgium (BE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 44B661 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 44B661, octal 21133141, decimal 4,503,137.
What flights does 44B661 operate?
Mode-S 44B661 has broadcast 1 distinct callsign, including OOMSA.