Apparatus

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sensors Mode-S transponder

4BA955

ICAO 24-bit transponder address · allocated to Turkey

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

Hex
4BA955
Octal
22724525
Decimal
4,958,549
Country
TR
Tail
TC-JJU
Type
B77W
No current signal · last broadcast 19m ago
Flights observed
239
Distinct callsigns
20
Country
TR
Last broadcast
19m ago

Last known position

Most recent position reported by Mode-S 4BA955.

Country allocation

The ICAO 24-bit address 4BA955 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
THY71 Turkish Airlines 14 2026-06-15
THY10 Turkish Airlines 10 2026-06-02
THY73 - 9 2026-07-12
THY88 Turkish Airlines 8 2026-07-05
THY70 Turkish Airlines 8 2026-06-15
THY27 Turkish Airlines 8 2026-07-01
THY9 Turkish Airlines 7 2026-06-01
THY4 - 7 2026-06-12
THY89 Turkish Airlines 6 2026-07-05
THY85 Turkish Airlines 6 2026-06-11
THY84 Turkish Airlines 6 2026-06-10
THY3 Turkish Airlines 6 2026-06-12
THY26 - 6 2026-06-29
THY72 - 5 2026-07-12
THY3AX - 5 2026-07-07
THY2XQ - 5 2026-07-07
THY21 - 5 2026-07-04
THY1 Turkish Airlines 5 2026-04-16
THY80E - 4 2026-07-04
THY55 - 4 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 THY2AY - Jul 14, 02:50 UTCJul 14, 07:00 UTC4h 10m
2026-07-13 THY5KM - Jul 13, 12:15 UTCJul 14, 00:30 UTC12h 15m
2026-07-13 THY6KL - Jul 13, 08:10 UTCJul 13, 09:05 UTC55m
2026-07-13 THY8FW - Jul 13, 04:50 UTCJul 13, 05:50 UTC1h 0m
2026-07-12 THY73 - Jul 12, 17:20 UTCJul 13, 00:50 UTC7h 30m
2026-07-12 THY72 - Jul 12, 00:05 UTCJul 12, 05:55 UTC5h 50m
2026-07-11 THY72 - Jul 11, 22:40 UTCJul 11, 23:10 UTC30m
2026-07-11 THY1896 - Jul 11, 13:45 UTCJul 11, 15:55 UTC2h 10m
2026-07-11 THY2HG - Jul 11, 09:10 UTCJul 11, 11:25 UTC2h 15m
2026-07-10 THY76Y - Jul 10, 07:40 UTCJul 10, 18:15 UTC10h 35m
2026-07-09 THY75D - Jul 9, 12:45 UTCJul 10, 00:40 UTC11h 55m
2026-07-09 THY4YL - Jul 9, 08:25 UTCJul 9, 09:00 UTC35m
2026-07-09 THY3UZ - Jul 9, 05:35 UTCJul 9, 05:55 UTC20m
2026-07-09 THY55 - Jul 9, 02:30 UTCJul 9, 02:40 UTC10m
2026-07-08 THY55 - Jul 8, 16:15 UTCJul 9, 01:50 UTC9h 35m
2026-07-07 THY54 - Jul 7, 23:15 UTCJul 8, 09:20 UTC10h 5m
2026-07-07 THY3AX - Jul 7, 19:20 UTCJul 7, 20:10 UTC50m
2026-07-07 THY2XQ - Jul 7, 16:25 UTCJul 7, 17:25 UTC1h 0m
2026-07-07 THY32G - Jul 7, 02:35 UTCJul 7, 12:35 UTC10h 0m
2026-07-06 THY31K IST → ATL Jul 6, 12:10 UTCJul 6, 23:50 UTC11h 40m
2026-07-06 THY6KL - Jul 6, 08:30 UTCJul 6, 09:30 UTC1h 0m
2026-07-06 THY8FW - Jul 6, 05:20 UTCJul 6, 06:20 UTC1h 0m
2026-07-05 THY89 PEK → IST Jul 5, 16:30 UTCJul 6, 00:55 UTC8h 25m
2026-07-05 THY88 IST → PEK Jul 5, 06:40 UTCJul 5, 07:05 UTC25m
2026-07-05 THY88 IST → PEK Jul 5, 00:05 UTCJul 5, 00:55 UTC50m
2026-07-04 THY88 IST → PEK Jul 4, 23:10 UTCJul 4, 23:25 UTC15m
2026-07-04 THY4YH - Jul 4, 18:50 UTCJul 4, 19:30 UTC40m
2026-07-04 THY80E - Jul 4, 16:25 UTCJul 4, 17:00 UTC35m
2026-07-04 THY21 - Jul 4, 11:25 UTCJul 4, 11:50 UTC25m
2026-07-04 THY21 - Jul 4, 02:35 UTCJul 4, 10:50 UTC8h 15m
2026-07-04 THY21 - Jul 4, 01:25 UTCJul 4, 01:40 UTC15m
2026-07-03 THY20 IST → ICN Jul 3, 22:50 UTCJul 3, 23:20 UTC30m
2026-07-03 THY20 IST → ICN Jul 3, 14:15 UTCJul 3, 21:55 UTC7h 40m
2026-07-03 THY3ES - Jul 3, 09:20 UTCJul 3, 11:35 UTC2h 15m
2026-07-03 THY9FP - Jul 3, 04:30 UTCJul 3, 06:40 UTC2h 10m
2026-07-03 THY89 PEK → IST Jul 3, 01:25 UTCJul 3, 01:35 UTC10m
2026-07-02 THY89 PEK → IST Jul 2, 16:25 UTCJul 3, 00:35 UTC8h 10m
2026-07-01 THY88 IST → PEK Jul 1, 23:20 UTCJul 2, 01:05 UTC1h 45m
2026-07-01 THY3RU CMN → IST Jul 1, 16:45 UTCJul 1, 20:50 UTC4h 5m
2026-07-01 THY5RM - Jul 1, 09:50 UTCJul 1, 13:35 UTC3h 45m
2026-07-01 THY27 PVG → IST Jul 1, 01:15 UTCJul 1, 01:35 UTC20m
2026-06-30 THY27 PVG → IST Jun 30, 06:55 UTCJul 1, 00:40 UTC17h 45m
2026-06-29 THY26 - Jun 29, 23:19 UTCJun 30, 16:30 UTC17h 10m
2026-06-29 THY3AX - Jun 29, 19:09 UTCJun 29, 20:04 UTC55m
2026-06-29 THY2XQ - Jun 29, 16:50 UTCJun 29, 17:19 UTC30m
2026-06-29 THY12 - Jun 29, 04:50 UTCJun 29, 13:30 UTC8h 40m
2026-06-28 THY11 IST → JFK Jun 28, 16:14 UTCJun 29, 01:55 UTC9h 40m
2026-06-28 THY6FL - Jun 28, 10:10 UTCJun 28, 13:04 UTC2h 55m
2026-06-28 THY7WT - Jun 28, 04:29 UTCJun 28, 07:20 UTC2h 50m
2026-06-27 THY27 PVG → IST Jun 27, 16:20 UTCJun 28, 01:59 UTC9h 40m

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

Mode-S 4BA955 frequently asked

What is Mode-S code 4BA955?
4BA955 is an ICAO 24-bit transponder address. Allocated to Turkey. Assigned to TC-JJU.
Where is Mode-S 4BA955 registered?
Mode-S code 4BA955 is allocated to Turkey (TR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4BA955 broadcasting right now?
No active broadcast right now. Last signal was 19m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4BA955, octal 22724525, decimal 4,958,549.
What flights does 4BA955 operate?
Mode-S 4BA955 has broadcast 20 distinct callsigns, including THY71, THY10, THY73, THY88, THY70.