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 Jul 26, 17:55 UTC
Flights observed
281
Distinct callsigns
20
Country
TR
Last broadcast
Jul 26, 17:55 UTC

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 - 14 2026-07-19
THY4 Turkish Airlines 12 2026-07-19
THY73 Turkish Airlines 10 2026-07-23
THY85 Turkish Airlines 9 2026-07-25
THY199 - 9 2026-06-23
THY27 Turkish Airlines 8 2026-06-05
THY2 - 8 2026-07-10
THY1 - 8 2026-07-09
THY84 Turkish Airlines 7 2026-07-24
THY6 - 6 2026-07-11
THY5 - 6 2026-07-10
THY198 - 6 2026-06-21
THY86 Turkish Airlines 5 2026-04-20
THY72 - 5 2026-07-22
THY3AX - 5 2026-06-24
THY2XQ - 5 2026-06-24
THY26 Turkish Airlines 5 2026-06-03
THY25 - 5 2026-07-13
THY99D Turkish Airlines 4 2026-07-21
THY8XS - 4 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 THY9TU IST → MAD Jul 26, 17:00 UTCJul 26, 17:55 UTC55m
2026-07-26 THY9EH IST → DLM Jul 26, 14:20 UTCJul 26, 14:55 UTC35m
2026-07-26 THY8 IAD → IST Jul 26, 02:25 UTCJul 26, 11:30 UTC9h 6m
2026-07-25 THY7 IST → IAD Jul 25, 14:10 UTCJul 26, 00:15 UTC10h 5m
2026-07-25 THY3YB LUX → IST Jul 25, 09:15 UTCJul 25, 11:25 UTC2h 10m
2026-07-25 THY4XL BAL → IST Jul 25, 04:55 UTCJul 25, 07:00 UTC2h 5m
2026-07-25 THY85 MNL → IST Jul 25, 00:45 UTCJul 25, 01:05 UTC20m
2026-07-24 THY85 MNL → IST Jul 24, 13:40 UTCJul 25, 00:05 UTC10h 25m
2026-07-24 THY84 IST → MNL Jul 24, 00:55 UTCJul 24, 10:35 UTC9h 40m
2026-07-23 THY84 IST → MNL Jul 23, 23:35 UTCJul 24, 00:00 UTC25m
2026-07-23 THY3RU CMN → IST Jul 23, 17:05 UTCJul 23, 20:45 UTC3h 40m
2026-07-23 THY5RM IST → CMN Jul 23, 10:50 UTCJul 23, 15:00 UTC4h 10m
2026-07-23 THY2NP AYT → VKO Jul 23, 07:50 UTCJul 23, 08:30 UTC40m
2026-07-23 THY3YH IST → BOD Jul 23, 05:20 UTCJul 23, 05:55 UTC35m
2026-07-23 THY73 CAN → IST Jul 23, 01:45 UTCJul 23, 02:10 UTC25m
2026-07-22 THY73 CAN → IST Jul 22, 18:00 UTCJul 23, 01:10 UTC7h 10m
2026-07-22 THY73 CAN → IST Jul 22, 04:35 UTCJul 23, 01:10 UTC20h 35m
2026-07-22 THY73 CAN → IST Jul 22, 03:00 UTCJul 23, 01:10 UTC22h 10m
2026-07-22 THY73 CAN → IST Jul 22, 00:20 UTCJul 23, 00:15 UTC23h 55m
2026-07-22 THY72 - Jul 22, 00:00 UTCJul 22, 20:55 UTC20h 55m
2026-07-21 THY72 - Jul 21, 22:45 UTCJul 21, 23:10 UTC25m
2026-07-21 THY99D MIA → IST Jul 21, 02:45 UTCJul 21, 13:25 UTC10h 40m
2026-07-20 THY77J IST → MIA Jul 20, 12:45 UTCJul 21, 00:00 UTC11h 14m
2026-07-20 THY1CK BJV → IST Jul 20, 09:10 UTCJul 20, 10:10 UTC1h 0m
2026-07-20 THY6TG IST → BJV Jul 20, 06:25 UTCJul 20, 07:20 UTC55m
2026-07-19 THY4 JFK → IST Jul 19, 17:35 UTCJul 20, 02:25 UTC8h 50m
2026-07-19 THY3 - Jul 19, 04:55 UTCJul 19, 14:45 UTC9h 50m
2026-07-18 THY85 - Jul 18, 13:45 UTCJul 18, 18:25 UTC4h 40m
2026-07-17 THY84 - Jul 17, 23:30 UTCJul 18, 11:00 UTC11h 31m
2026-07-17 THY10 - Jul 17, 03:50 UTCJul 17, 16:04 UTC12h 15m
2026-07-16 THY9 - Jul 16, 12:05 UTCJul 17, 01:20 UTC13h 15m
2026-07-16 THY2NP - Jul 16, 07:55 UTCJul 16, 08:40 UTC45m
2026-07-16 THY3YH - Jul 16, 05:20 UTCJul 16, 05:55 UTC35m
2026-07-16 THY55 - Jul 16, 01:20 UTCJul 16, 01:35 UTC15m
2026-07-15 THY55 - Jul 15, 15:30 UTCJul 16, 00:40 UTC9h 10m
2026-07-14 THY54 - Jul 14, 23:25 UTCJul 15, 09:50 UTC10h 25m
2026-07-14 THY2NA - Jul 14, 18:30 UTCJul 14, 20:25 UTC1h 55m
2026-07-14 THY3GK - Jul 14, 14:20 UTCJul 14, 16:15 UTC1h 55m
2026-07-13 THY281 - Jul 13, 17:15 UTCJul 14, 11:50 UTC18h 35m
2026-07-13 THY281 - Jul 13, 14:20 UTCJul 14, 11:50 UTC21h 30m
2026-07-13 THY281 - Jul 13, 12:40 UTCJul 14, 11:50 UTC23h 10m
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

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 Jul 26, 17:55 UTC.
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, THY73, THY85, THY199.