Apparatus

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sensors Mode-S transponder

440B91

ICAO 24-bit transponder address · allocated to Austria

Currently assigned to OE-IXC · BOEING 737-800

Hex
440B91
Octal
21005621
Decimal
4,459,409
Country
AT
Tail
OE-IXC
Type
B738
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
228
Distinct callsigns
20
Country
AT
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S 440B91.

Country allocation

The ICAO 24-bit address 440B91 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 20 distinct

Callsign Airline Flights Last seen
TAY5VA ASL Airlines Belgium 20 2026-07-22
TAY4VA - 20 2026-07-22
TAY1VQ - 20 2026-07-21
TAY8VC - 18 2026-07-09
TAY2VQ - 18 2026-07-21
TAY9VC - 13 2026-05-20
TAY8SR - 12 2026-07-15
TAY7FO - 11 2026-07-23
TAY7SR - 10 2026-07-15
TAY1LA - 10 2026-07-14
TAY6SO - 8 2026-06-17
TAY5AD - 6 2026-07-10
TAY5TR ASL Airlines Belgium 5 2026-07-26
TAY2ST - 5 2026-04-17
TAY7BS - 4 2026-07-02
TAY6BS - 4 2026-07-02
TAY5SO - 4 2026-06-17
TAY3EA - 4 2026-07-12
TAY9SL - 3 2026-07-20
TAY8SL - 3 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TAY5TR NUE → STR Jul 26, 18:55 UTCJul 26, 21:15 UTC2h 20m
2026-07-24 TAY4999 LGG → CMN Jul 24, 21:30 UTCJul 24, 22:35 UTC1h 5m
2026-07-24 TAY4999 LGG → CMN Jul 24, 19:20 UTCJul 24, 20:35 UTC1h 15m
2026-07-23 TAY7FO - Jul 23, 02:10 UTCJul 23, 03:35 UTC1h 25m
2026-07-22 TAY5VA LYS → CDG Jul 22, 20:45 UTCJul 22, 21:35 UTC50m
2026-07-22 TAY5VA LYS → CDG Jul 22, 19:15 UTCJul 22, 19:40 UTC25m
2026-07-22 TAY4VA LYS → GVA Jul 22, 04:35 UTCJul 22, 04:50 UTC15m
2026-07-22 TAY4VA CDG → LYS Jul 22, 02:40 UTCJul 22, 03:15 UTC35m
2026-07-21 TAY2VQ - Jul 21, 20:25 UTCJul 21, 21:40 UTC1h 15m
2026-07-21 TAY2VQ - Jul 21, 18:10 UTCJul 21, 19:10 UTC1h 0m
2026-07-21 TAY1VQ - Jul 21, 06:00 UTCJul 21, 06:45 UTC45m
2026-07-21 TAY1VQ - Jul 21, 02:05 UTCJul 21, 04:00 UTC1h 55m
2026-07-20 TAY9SL - Jul 20, 20:50 UTCJul 20, 21:30 UTC40m
2026-07-17 TAY8SL - Jul 17, 02:15 UTCJul 17, 03:05 UTC50m
2026-07-16 TAY9SL - Jul 16, 21:00 UTCJul 16, 21:50 UTC50m
2026-07-16 TAY8SL - Jul 16, 02:40 UTCJul 16, 03:15 UTC35m
2026-07-15 TAY8SR MUC → LGG Jul 15, 21:35 UTCJul 15, 22:30 UTC55m
2026-07-15 TAY8SR - Jul 15, 19:00 UTCJul 15, 20:15 UTC1h 15m
2026-07-15 TAY7SR - Jul 15, 04:30 UTCJul 15, 05:25 UTC55m
2026-07-15 TAY7SR - Jul 15, 02:05 UTCJul 15, 03:05 UTC1h 0m
2026-07-14 TAY1LA FCO → CDG Jul 14, 20:55 UTCJul 14, 22:40 UTC1h 45m
2026-07-14 TAY9VX - Jul 14, 02:30 UTCJul 14, 03:55 UTC1h 25m
2026-07-13 TAY8SR - Jul 13, 21:30 UTCJul 13, 22:25 UTC55m
2026-07-13 TAY8SR - Jul 13, 18:50 UTCJul 13, 20:10 UTC1h 20m
2026-07-12 TAY3EA - Jul 12, 22:10 UTCJul 12, 22:45 UTC35m
2026-07-12 TAY3EA - Jul 12, 18:35 UTCJul 12, 20:50 UTC2h 15m
2026-07-10 TAY5AD - Jul 10, 21:10 UTCJul 10, 22:20 UTC1h 10m
2026-07-10 TAY5AD - Jul 10, 18:15 UTCJul 10, 19:10 UTC55m
2026-07-10 TAY1VQ - Jul 10, 06:05 UTCJul 10, 06:50 UTC45m
2026-07-10 TAY1VQ - Jul 10, 02:05 UTCJul 10, 03:55 UTC1h 50m
2026-07-09 TAY9VL - Jul 9, 21:00 UTCJul 9, 22:45 UTC1h 45m
2026-07-09 TAY9VL VLC → BCN Jul 9, 19:00 UTCJul 9, 19:40 UTC40m
2026-07-09 TAY8VC - Jul 9, 05:30 UTCJul 9, 06:15 UTC45m
2026-07-09 TAY8VC - Jul 9, 03:10 UTCJul 9, 04:20 UTC1h 10m
2026-07-08 TAY1LA - Jul 8, 20:55 UTCJul 8, 22:35 UTC1h 40m
2026-07-08 TAY9VX - Jul 8, 02:20 UTCJul 8, 03:50 UTC1h 30m
2026-07-07 TAY9SL - Jul 7, 20:55 UTCJul 7, 21:40 UTC45m
2026-07-07 TAY8SL - Jul 7, 02:25 UTCJul 7, 03:05 UTC40m
2026-07-06 TAY8SR - Jul 6, 21:30 UTCJul 6, 22:25 UTC55m
2026-07-06 TAY8SR - Jul 6, 18:55 UTCJul 6, 20:05 UTC1h 10m
2026-07-05 TAY3EA - Jul 5, 22:00 UTCJul 5, 22:35 UTC35m
2026-07-05 TAY3EA - Jul 5, 18:45 UTCJul 5, 21:00 UTC2h 15m
2026-07-03 TAY5KW KTW → CDG Jul 3, 20:40 UTCJul 3, 22:25 UTC1h 45m
2026-07-03 TAY4KW - Jul 3, 02:20 UTCJul 3, 03:55 UTC1h 35m
2026-07-02 TAY6BS - Jul 2, 15:30 UTCJul 2, 16:15 UTC45m
2026-07-02 TAY7BS - Jul 2, 03:00 UTCJul 2, 03:45 UTC45m
2026-07-01 TAY1BS - Jul 1, 20:55 UTCJul 1, 21:40 UTC45m
2026-07-01 TAY3BS - Jul 1, 19:00 UTCJul 1, 19:45 UTC45m
2026-07-01 TAY6BS - Jul 1, 15:35 UTCJul 1, 16:25 UTC50m
2026-07-01 TAY7BS - Jul 1, 02:45 UTCJul 1, 03:25 UTC40m

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

Mode-S 440B91 frequently asked

What is Mode-S code 440B91?
440B91 is an ICAO 24-bit transponder address. Allocated to Austria. Assigned to OE-IXC.
Where is Mode-S 440B91 registered?
Mode-S code 440B91 is allocated to Austria (AT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 440B91 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 440B91, octal 21005621, decimal 4,459,409.
What flights does 440B91 operate?
Mode-S 440B91 has broadcast 20 distinct callsigns, including TAY5VA, TAY4VA, TAY1VQ, TAY8VC, TAY2VQ.