Apparatus

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sensors Mode-S transponder

44B438

ICAO 24-bit transponder address · allocated to Belgium

Currently assigned to OO-MAX · BOEING 737 MAX 8

Hex
44B438
Octal
21132070
Decimal
4,502,584
Country
BE
Tail
OO-MAX
Type
B38M
Broadcasting now · callsign TFL4MH · 39,000 ft
Flights observed
237
Distinct callsigns
20
Country
BE
Last broadcast
Jul 26, 22:00 UTC

Current position

44B438 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 44B438 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 20 distinct

Callsign Airline Flights Last seen
TFL17T - 30 2026-07-01
TFL77D - 22 2026-07-03
TFL5DK - 22 2026-07-03
TFL1LH - 22 2026-07-01
TFL99K - 20 2026-06-28
TFL90W - 20 2026-06-28
JAF35D Jetairfly 6 2026-04-17
JAF66H - 5 2026-04-17
JAF3VC - 5 2026-04-18
TFL95X - 4 2026-07-11
TFL19X Arkefly 3 2026-07-17
JAF63N - 3 2026-04-13
TFL8WM Arkefly 2 2026-07-26
TFL8VM Arkefly 2 2026-07-22
TFL7XC Arkefly 2 2026-07-26
TFL6DY - 2 2026-07-22
TFL50D - 2 2026-07-04
TFL4KA - 2 2026-07-16
TFL4GD Arkefly 2 2026-07-26
TFL3JK - 2 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TFL3BC HER → AMS Jul 26, 20:55 UTCJul 26, 22:00 UTC1h 5m
2026-07-26 TFL4GD AMS → HER Jul 26, 16:40 UTCJul 26, 19:30 UTC2h 50m
2026-07-26 TFL7XC TIA → AMS Jul 26, 13:00 UTCJul 26, 15:05 UTC2h 5m
2026-07-26 TFL8WM AMS → TIA Jul 26, 07:40 UTCJul 26, 09:30 UTC1h 50m
2026-07-25 TFL14D TFS → AMS Jul 25, 18:55 UTCJul 25, 22:55 UTC4h 0m
2026-07-25 TFL4LX AMS → TFS Jul 25, 13:25 UTCJul 25, 17:20 UTC3h 55m
2026-07-25 TFL7XC TIA → AMS Jul 25, 09:45 UTCJul 25, 11:40 UTC1h 55m
2026-07-25 TFL8WM AMS → TIA Jul 25, 05:35 UTCJul 25, 07:25 UTC1h 50m
2026-07-23 TFL5EL PMI → AMS Jul 23, 19:15 UTCJul 23, 21:25 UTC2h 10m
2026-07-23 TFL6VY - Jul 23, 16:10 UTCJul 23, 18:10 UTC2h 0m
2026-07-22 TFL8VM HER → AMS Jul 22, 17:00 UTCJul 22, 20:30 UTC3h 30m
2026-07-22 TFL6DY - Jul 22, 12:40 UTCJul 22, 15:30 UTC2h 50m
2026-07-21 TFL33T AMS → FUE Jul 21, 14:00 UTCJul 21, 22:55 UTC8h 55m
2026-07-21 TFL16T DLM → AMS Jul 21, 08:45 UTCJul 21, 12:15 UTC3h 30m
2026-07-21 TFL5CN AMS → DLM Jul 21, 04:25 UTCJul 21, 07:25 UTC3h 0m
2026-07-20 TFL63A - Jul 20, 16:25 UTCJul 20, 19:50 UTC3h 25m
2026-07-20 TFL2KC - Jul 20, 12:00 UTCJul 20, 14:55 UTC2h 55m
2026-07-18 TFL79B - Jul 18, 18:00 UTCJul 18, 21:45 UTC3h 45m
2026-07-18 TFL50G - Jul 18, 12:20 UTCJul 18, 16:25 UTC4h 5m
2026-07-18 TFL38C IBZ → AMS Jul 18, 08:10 UTCJul 18, 10:15 UTC2h 5m
2026-07-18 TFL3AW AMS → IBZ Jul 18, 04:35 UTCJul 18, 06:45 UTC2h 10m
2026-07-17 TFL4078 - Jul 17, 21:10 UTCJul 18, 00:39 UTC3h 30m
2026-07-17 TFL4077 - Jul 17, 16:49 UTCJul 17, 19:45 UTC2h 55m
2026-07-17 TFL19X AMS → MJT Jul 17, 11:04 UTCJul 17, 14:30 UTC3h 25m
2026-07-17 TFL19X AMS → MJT Jul 17, 08:40 UTCJul 17, 09:04 UTC25m
2026-07-17 TFL19X AMS → MJT Jul 17, 04:59 UTCJul 17, 07:44 UTC2h 45m
2026-07-16 TFL4KA - Jul 16, 16:55 UTCJul 16, 20:25 UTC3h 30m
2026-07-16 TFL32N - Jul 16, 12:00 UTCJul 16, 14:55 UTC2h 55m
2026-07-16 TFL3PX - Jul 16, 08:00 UTCJul 16, 10:00 UTC2h 0m
2026-07-16 TFL5EJ - Jul 16, 04:30 UTCJul 16, 06:45 UTC2h 15m
2026-07-15 TFL3AN - Jul 15, 15:55 UTCJul 15, 18:05 UTC2h 10m
2026-07-15 TFL3JK - Jul 15, 12:20 UTCJul 15, 14:10 UTC1h 50m
2026-07-15 TFL7PX - Jul 15, 07:40 UTCJul 15, 10:05 UTC2h 25m
2026-07-15 TFL38M - Jul 15, 04:10 UTCJul 15, 06:05 UTC1h 55m
2026-07-14 TFL8FA - Jul 14, 11:40 UTCJul 14, 22:35 UTC10h 55m
2026-07-13 TFL65L - Jul 13, 21:50 UTCJul 14, 01:20 UTC3h 30m
2026-07-13 TFL5PV - Jul 13, 15:45 UTCJul 13, 20:20 UTC4h 35m
2026-07-13 TFL6WV - Jul 13, 10:35 UTCJul 13, 14:10 UTC3h 35m
2026-07-13 TFL9LE - Jul 13, 04:40 UTCJul 13, 08:50 UTC4h 10m
2026-07-11 TFL62X RHO → AMS Jul 11, 20:50 UTCJul 12, 00:25 UTC3h 35m
2026-07-11 TFL4DM AMS → RHO Jul 11, 16:10 UTCJul 11, 19:30 UTC3h 20m
2026-07-11 TFL1HA FNC → AMS Jul 11, 11:00 UTCJul 11, 14:30 UTC3h 30m
2026-07-11 TFL95X - Jul 11, 09:30 UTCJul 11, 09:50 UTC20m
2026-07-11 TFL95X - Jul 11, 05:55 UTCJul 11, 08:50 UTC2h 55m
2026-07-10 TFL7GX - Jul 10, 19:25 UTCJul 10, 23:10 UTC3h 45m
2026-07-10 TFL4BC - Jul 10, 14:55 UTCJul 10, 18:15 UTC3h 20m
2026-07-10 TFL7LX - Jul 10, 10:10 UTCJul 10, 13:05 UTC2h 55m
2026-07-10 TFL1PD - Jul 10, 06:20 UTCJul 10, 09:00 UTC2h 40m
2026-07-09 TFL3BC - Jul 9, 20:40 UTCJul 10, 00:10 UTC3h 30m
2026-07-09 TFL4GD - Jul 9, 16:10 UTCJul 9, 19:05 UTC2h 55m

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

Mode-S 44B438 frequently asked

What is Mode-S code 44B438?
44B438 is an ICAO 24-bit transponder address. Allocated to Belgium. Assigned to OO-MAX.
Where is Mode-S 44B438 registered?
Mode-S code 44B438 is allocated to Belgium (BE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 44B438 broadcasting right now?
Yes. Mode-S 44B438 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 44B438, octal 21132070, decimal 4,502,584.
What flights does 44B438 operate?
Mode-S 44B438 has broadcast 20 distinct callsigns, including TFL17T, TFL77D, TFL5DK, TFL1LH, TFL99K.