Apparatus

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sensors Mode-S transponder

4BAA55

ICAO 24-bit transponder address · allocated to Turkey

Currently assigned to TC-JRU · AIRBUS A-321

Hex
4BAA55
Octal
22725125
Decimal
4,958,805
Country
TR
Tail
TC-JRU
Type
A321
No current signal · last broadcast 10h ago
Flights observed
161
Distinct callsigns
20
Country
TR
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 4BAA55.

Country allocation

The ICAO 24-bit address 4BAA55 falls within the block assigned to Turkey (TR) by ICAO Annex 10, Volume III. Every aircraft registered in Turkey 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
THY142 Turkish Airlines 4 2026-04-18
THY664 Turkish Airlines 3 2026-05-10
THY663 Turkish Airlines 3 2026-05-10
THY9TF Turkish Airlines 2 2026-05-01
THY9QW Turkish Airlines 2 2026-05-25
THY9BA Turkish Airlines 2 2026-04-14
THY8SA Turkish Airlines 2 2026-05-25
THY8PN Turkish Airlines 2 2026-05-19
THY8GZ - 2 2026-04-16
THY7WF Turkish Airlines 2 2026-04-16
THY7RS Turkish Airlines 2 2026-04-16
THY6GR Turkish Airlines 2 2026-05-17
THY6CV Turkish Airlines 2 2026-05-23
THY5YN Turkish Airlines 2 2026-05-23
THY5TH Turkish Airlines 2 2026-05-04
THY5ER Turkish Airlines 2 2026-05-20
THY5BU Turkish Airlines 2 2026-05-27
THY5AW Turkish Airlines 2 2026-04-15
THY4SE Turkish Airlines 2 2026-05-27
THY4HN Turkish Airlines 2 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 THY3MB DLM → IST May 29, 17:25 UTCMay 29, 18:15 UTC50m
2026-05-29 THY2EZ IST → BCN May 29, 15:20 UTCMay 29, 16:10 UTC50m
2026-05-29 THY2NC MSR → IST May 29, 05:35 UTCMay 29, 10:55 UTC5h 20m
2026-05-28 THY4TA CAI → IST May 28, 19:05 UTCMay 28, 21:00 UTC1h 55m
2026-05-28 THY3PC IST → CAI May 28, 15:35 UTCMay 28, 17:10 UTC1h 35m
2026-05-28 THY8DH IST → ASR May 28, 10:15 UTCMay 28, 13:30 UTC3h 15m
2026-05-28 THY7VL GVA → IST May 28, 06:55 UTCMay 28, 08:10 UTC1h 15m
2026-05-28 THY6LJ ECN → IST May 28, 04:20 UTCMay 28, 05:40 UTC1h 20m
2026-05-27 THY5BU SJJ → IST May 27, 18:50 UTCMay 27, 20:05 UTC1h 15m
2026-05-27 THY4SE IST → SJJ May 27, 16:20 UTCMay 27, 17:35 UTC1h 15m
2026-05-27 THY1WR - May 27, 09:10 UTCMay 27, 09:20 UTC10m
2026-05-26 THY5UZ ADB → IST May 26, 16:15 UTCMay 26, 16:40 UTC25m
2026-05-26 THY2VN KYA → IST May 26, 14:20 UTCMay 26, 15:00 UTC40m
2026-05-26 THY8KT OSL → IST May 26, 10:10 UTCMay 26, 10:20 UTC10m
2026-05-25 THY4WS DIY → IST May 25, 18:30 UTCMay 25, 18:40 UTC10m
2026-05-25 THY7ZH IST → DIY May 25, 14:35 UTCMay 25, 14:45 UTC10m
2026-05-25 THY7VK BJV → IST May 25, 11:45 UTCMay 25, 12:20 UTC35m
2026-05-25 THY6GU IST → BJV May 25, 09:45 UTCMay 25, 10:30 UTC45m
2026-05-25 THY9QW DLM → IST May 25, 05:20 UTCMay 25, 06:05 UTC45m
2026-05-25 THY8SA IST → DLM May 25, 03:35 UTCMay 25, 04:15 UTC40m
2026-05-24 THY4AF TIA → IST May 24, 18:10 UTCMay 24, 19:15 UTC1h 5m
2026-05-24 THY5DQ IST → TIA May 24, 15:45 UTCMay 24, 16:35 UTC50m
2026-05-24 THY4AQ - May 24, 12:50 UTCMay 24, 13:05 UTC15m
2026-05-24 THY4AQ - May 24, 11:35 UTCMay 24, 12:10 UTC35m
2026-05-24 THY8RJ - May 24, 10:15 UTCMay 24, 10:30 UTC15m
2026-05-24 THY7VC LHR → ESB May 24, 00:45 UTCMay 24, 01:00 UTC15m
2026-05-23 THY2US IST → GZT May 23, 21:20 UTCMay 23, 21:30 UTC10m
2026-05-23 THY87N ASR → SAW May 23, 19:00 UTCMay 23, 19:10 UTC10m
2026-05-23 THY7HV MUC → IST May 23, 15:55 UTCMay 23, 16:05 UTC10m
2026-05-23 THY6CV LGW → IST May 23, 12:35 UTCMay 23, 13:55 UTC1h 20m
2026-05-23 THY5YN IST → BGG May 23, 10:15 UTCMay 23, 11:25 UTC1h 10m
2026-05-23 THY4EC NAV → IST May 23, 08:15 UTCMay 23, 08:25 UTC10m
2026-05-23 THY7VD - May 23, 05:30 UTCMay 23, 05:40 UTC10m
2026-05-23 THY7MB ADB → IST May 23, 01:05 UTCMay 23, 01:40 UTC35m
2026-05-22 THY8BW IST → ADB May 22, 23:20 UTCMay 22, 23:55 UTC35m
2026-05-22 THY9XH IST → EDI May 22, 16:50 UTCMay 22, 20:00 UTC3h 10m
2026-05-22 THY4BZ VLC → IST May 22, 12:40 UTCMay 22, 15:40 UTC3h 0m
2026-05-22 THY1CK BJV → IST May 22, 09:05 UTCMay 22, 09:45 UTC40m
2026-05-22 THY6TG IST → BJV May 22, 07:10 UTCMay 22, 08:00 UTC50m
2026-05-21 THY4VY ADB → IST May 21, 20:10 UTCMay 21, 20:50 UTC40m
2026-05-21 THY2TY - May 21, 18:30 UTCMay 21, 19:05 UTC35m
2026-05-21 THY3ZB - May 21, 16:05 UTCMay 21, 16:15 UTC10m
2026-05-21 THY3AH IST → TLL May 21, 12:35 UTCMay 21, 15:10 UTC2h 35m
2026-05-21 THY3AH IST → TLL May 21, 11:40 UTCMay 21, 11:55 UTC15m
2026-05-21 THY2XH TBS → IST May 21, 09:10 UTCMay 21, 09:20 UTC10m
2026-05-21 THY2XH TBS → IST May 21, 07:30 UTCMay 21, 08:25 UTC55m
2026-05-21 THY1KY IST → TBS May 21, 06:05 UTCMay 21, 06:10 UTC5m
2026-05-20 THY5ER IST → CDG May 20, 11:55 UTCMay 20, 12:05 UTC10m
2026-05-20 THY5ER IST → CDG May 20, 05:45 UTCMay 20, 06:35 UTC50m
2026-05-19 THY2FZ DNZ → IST May 19, 18:50 UTCMay 19, 19:00 UTC10m

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 TC-JRU page for operator, model, and routing details .

Mode-S 4BAA55 frequently asked

What is Mode-S code 4BAA55?
4BAA55 is an ICAO 24-bit transponder address. Allocated to Turkey. Assigned to TC-JRU.
Where is Mode-S 4BAA55 registered?
Mode-S code 4BAA55 is allocated to Turkey (TR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4BAA55 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 4BAA55, octal 22725125, decimal 4,958,805.
What flights does 4BAA55 operate?
Mode-S 4BAA55 has broadcast 20 distinct callsigns, including THY142, THY664, THY663, THY9TF, THY9QW.