Apparatus

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sensors Mode-S transponder

4BA959

ICAO 24-bit transponder address · allocated to Turkey

Currently assigned to TC-JJY · BOEING 777-300ER

Hex
4BA959
Octal
22724531
Decimal
4,958,553
Country
TR
Tail
TC-JJY
Type
B77W
No current signal · last broadcast 10h ago
Flights observed
241
Distinct callsigns
20
Country
TR
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 4BA959.

Country allocation

The ICAO 24-bit address 4BA959 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
THY3 Turkish Airlines 13 2026-07-06
THY4 - 11 2026-07-06
THY199 - 9 2026-06-23
THY27 Turkish Airlines 8 2026-06-05
THY2 - 8 2026-07-10
THY1 - 8 2026-07-09
THY85 - 6 2026-07-06
THY6 - 6 2026-07-11
THY5 - 6 2026-07-10
THY198 - 6 2026-06-21
THY86 Turkish Airlines 5 2026-04-20
THY73 Turkish Airlines 5 2026-06-08
THY3AX - 5 2026-06-24
THY2XQ - 5 2026-06-24
THY26 Turkish Airlines 5 2026-06-03
THY25 - 5 2026-07-13
THY8XS - 4 2026-06-20
THY8HX - 4 2026-06-20
THY88 Turkish Airlines 4 2026-06-13
THY87 Turkish Airlines 4 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 THY280 - Jul 13, 12:40 UTCJul 13, 17:20 UTC4h 40m
2026-07-13 THY25 - Jul 13, 00:45 UTCJul 13, 01:15 UTC30m
2026-07-12 THY25 - Jul 12, 13:50 UTCJul 13, 00:10 UTC10h 20m
2026-07-11 THY24 - Jul 11, 22:55 UTCJul 12, 09:35 UTC10h 40m
2026-07-11 THY4YH - Jul 11, 19:00 UTCJul 11, 19:40 UTC40m
2026-07-11 THY80E - Jul 11, 17:05 UTCJul 11, 17:15 UTC10m
2026-07-11 THY6 - Jul 11, 01:40 UTCJul 11, 11:15 UTC9h 35m
2026-07-10 THY5 - Jul 10, 12:10 UTCJul 10, 23:10 UTC11h 1m
2026-07-10 THY2 - Jul 10, 00:30 UTCJul 10, 09:20 UTC8h 50m
2026-07-09 THY1 - Jul 9, 11:45 UTCJul 9, 21:50 UTC10h 5m
2026-07-09 THY6KL - Jul 9, 07:50 UTCJul 9, 08:45 UTC55m
2026-07-09 THY8FW - Jul 9, 04:45 UTCJul 9, 05:45 UTC1h 0m
2026-07-09 THY91 - Jul 9, 00:35 UTCJul 9, 00:55 UTC20m
2026-07-08 THY91 - Jul 8, 14:30 UTCJul 8, 23:50 UTC9h 20m
2026-07-08 THY90 - Jul 8, 07:45 UTCJul 8, 08:05 UTC20m
2026-07-07 THY90 - Jul 7, 23:15 UTCJul 8, 07:05 UTC7h 50m
2026-07-07 THY2JV - Jul 7, 18:55 UTCJul 7, 19:50 UTC55m
2026-07-07 THY9QA BLQ → IST Jul 7, 16:55 UTCJul 7, 17:15 UTC20m
2026-07-07 THY3MJ - Jul 7, 10:50 UTCJul 7, 13:50 UTC3h 0m
2026-07-07 THY30S - Jul 7, 05:20 UTCJul 7, 08:40 UTC3h 20m
2026-07-06 THY4 - Jul 6, 18:00 UTCJul 7, 02:50 UTC8h 50m
2026-07-06 THY3 IST → JFK Jul 6, 04:50 UTCJul 6, 15:00 UTC10h 10m
2026-07-06 THY85 - Jul 6, 01:15 UTCJul 6, 01:35 UTC20m
2026-07-05 THY85 - Jul 5, 14:00 UTCJul 6, 00:35 UTC10h 35m
2026-07-04 THY84 - Jul 4, 23:40 UTCJul 5, 10:45 UTC11h 5m
2026-07-04 THY12 - Jul 4, 05:20 UTCJul 4, 13:45 UTC8h 25m
2026-07-03 THY11 IST → JFK Jul 3, 16:15 UTCJul 4, 02:25 UTC10h 10m
2026-07-03 THY76Y - Jul 3, 02:40 UTCJul 3, 13:45 UTC11h 5m
2026-07-02 THY75D IST → YVR Jul 2, 13:00 UTCJul 3, 00:15 UTC11h 15m
2026-07-02 THY2 - Jul 2, 00:35 UTCJul 2, 09:30 UTC8h 55m
2026-07-01 THY1 IST → JFK Jul 1, 11:35 UTCJul 1, 21:15 UTC9h 40m
2026-06-30 THY32G - Jun 30, 02:20 UTCJun 30, 12:45 UTC10h 25m
2026-06-29 THY31K IST → ATL Jun 29, 12:29 UTCJun 29, 23:25 UTC10h 55m
2026-06-28 THY067 CGK → IST Jun 28, 06:20 UTCJun 29, 01:20 UTC19h 0m
2026-06-28 THY067 CGK → IST Jun 28, 04:20 UTCJun 29, 01:20 UTC21h 0m
2026-06-28 THY067 CGK → IST Jun 28, 03:45 UTCJun 29, 01:20 UTC21h 35m
2026-06-28 THY067 CGK → IST Jun 28, 00:59 UTCJun 29, 00:14 UTC23h 15m
2026-06-27 THY066 - Jun 27, 23:39 UTCJun 28, 20:34 UTC20h 55m
2026-06-27 THY32G - Jun 27, 02:20 UTCJun 27, 12:45 UTC10h 25m
2026-06-26 THY31K IST → ATL Jun 26, 12:10 UTCJun 26, 23:25 UTC11h 15m
2026-06-26 THY66C - Jun 26, 08:30 UTCJun 26, 09:24 UTC55m
2026-06-26 THY5AB - Jun 26, 05:39 UTCJun 26, 06:29 UTC50m
2026-06-26 THY25 TPE → IST Jun 26, 02:05 UTCJun 26, 02:24 UTC20m
2026-06-25 THY25 TPE → IST Jun 25, 15:10 UTCJun 26, 01:29 UTC10h 20m
2026-06-25 THY24 IST → TPE Jun 25, 00:24 UTCJun 25, 10:15 UTC9h 50m
2026-06-24 THY24 IST → TPE Jun 24, 23:10 UTCJun 24, 23:29 UTC20m
2026-06-24 THY3AX - Jun 24, 19:29 UTCJun 24, 20:49 UTC1h 20m
2026-06-24 THY2XQ - Jun 24, 16:19 UTCJun 24, 17:20 UTC1h 0m
2026-06-24 THY21 - Jun 24, 12:25 UTCJun 24, 12:44 UTC20m
2026-06-24 THY21 - Jun 24, 02:00 UTCJun 24, 11:50 UTC9h 50m

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

Mode-S 4BA959 frequently asked

What is Mode-S code 4BA959?
4BA959 is an ICAO 24-bit transponder address. Allocated to Turkey. Assigned to TC-JJY.
Where is Mode-S 4BA959 registered?
Mode-S code 4BA959 is allocated to Turkey (TR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4BA959 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 4BA959, octal 22724531, decimal 4,958,553.
What flights does 4BA959 operate?
Mode-S 4BA959 has broadcast 20 distinct callsigns, including THY3, THY4, THY199, THY27, THY2.