sensors Mode-S transponder

44D2AA

ICAO 24-bit transponder address · allocated to Belgium

Currently assigned to OO-TUJ · BOEING 737-800

Hex
44D2AA
Octal
21151252
Decimal
4,510,378
Country
BE
Tail
OO-TUJ
Type
B738
Broadcasting now · callsign JAF1BH · 37,000 ft
Flights observed
8
Distinct callsigns
5
Country
BE
Last broadcast
18h ago

Current position

44D2AA is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 44D2AA 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 5 distinct

Callsign Airline Flights Last seen
JAF8AV - 2 2026-04-13
JAF72J Jetairfly 2 2026-04-13
JAF14M - 2 2026-04-14
JAF84E - 1 2026-04-13
JAF20E - 1 2026-04-12

Recent flights last 8

DateFlightRouteTakeoffLandingDuration
2026-04-14 JAF14M - Apr 14, 09:10 UTCApr 14, 10:40 UTC1h 30m
2026-04-14 JAF14M - Apr 14, 07:55 UTCApr 14, 09:05 UTC1h 10m
2026-04-13 JAF84E - Apr 13, 13:40 UTCApr 13, 15:45 UTC2h 5m
2026-04-13 JAF8AV - Apr 13, 11:55 UTCApr 13, 12:05 UTC10m
2026-04-13 JAF8AV - Apr 13, 09:35 UTCApr 13, 12:05 UTC2h 30m
2026-04-13 JAF72J BRU → OUD Apr 13, 07:55 UTCApr 13, 08:15 UTC20m
2026-04-13 JAF72J BRU → OUD Apr 13, 05:40 UTCApr 13, 08:15 UTC2h 35m
2026-04-12 JAF20E - Apr 12, 18:35 UTCApr 12, 20:15 UTC1h 40m

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

Mode-S 44D2AA frequently asked

What is Mode-S code 44D2AA?
44D2AA is an ICAO 24-bit transponder address. Allocated to Belgium. Assigned to OO-TUJ.
Where is Mode-S 44D2AA registered?
Mode-S code 44D2AA is allocated to Belgium (BE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 44D2AA broadcasting right now?
Yes. Mode-S 44D2AA is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 44D2AA, octal 21151252, decimal 4,510,378.
What flights does 44D2AA operate?
Mode-S 44D2AA has broadcast 5 distinct callsigns, including JAF8AV, JAF72J, JAF14M, JAF84E, JAF20E.