Apparatus

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sensors Mode-S transponder

4B9E55

ICAO 24-bit transponder address · allocated to Turkey

Currently assigned to TC-GRU · BOEING 777-300

Hex
4B9E55
Octal
22717125
Decimal
4,955,733
Country
TR
Tail
TC-GRU
Type
B773
No current signal · last broadcast 3h ago
Flights observed
193
Distinct callsigns
19
Country
TR
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 4B9E55.

Country allocation

The ICAO 24-bit address 4B9E55 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 19 distinct

Callsign Airline Flights Last seen
MSC781 - 42 2026-05-14
MSC782 - 35 2026-05-13
MSC785 - 26 2026-05-15
MSC784 - 24 2026-05-13
STW001 - 9 2026-07-12
STW125 - 8 2026-07-13
STW225 - 7 2026-06-28
STW023 - 7 2026-07-06
STW024 - 6 2026-07-11
STW002 - 6 2026-07-10
STW226 - 5 2026-07-12
STW011 - 4 2026-07-10
STW141 - 3 2026-07-09
STW126 - 3 2026-07-01
STW012 - 3 2026-07-09
STW142 - 2 2026-07-11
STW8784 - 1 2026-05-16
STW8002 - 1 2026-06-24
STW8001 - 1 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 STW125 - Jul 13, 16:25 UTCJul 14, 03:20 UTC10h 55m
2026-07-12 STW226 AYT → AYT Jul 12, 18:25 UTCJul 13, 05:05 UTC10h 40m
2026-07-12 STW001 AYT → AYT Jul 12, 04:35 UTCJul 12, 16:20 UTC11h 45m
2026-07-11 STW024 - Jul 11, 17:05 UTCJul 12, 02:50 UTC9h 45m
2026-07-11 STW142 - Jul 11, 05:01 UTCJul 11, 14:40 UTC9h 40m
2026-07-10 STW011 - Jul 10, 16:30 UTCJul 11, 03:05 UTC10h 35m
2026-07-10 STW002 - Jul 10, 04:40 UTCJul 10, 14:35 UTC9h 55m
2026-07-09 STW012 - Jul 9, 23:55 UTCJul 10, 02:00 UTC2h 5m
2026-07-09 STW141 - Jul 9, 04:05 UTCJul 9, 17:45 UTC13h 40m
2026-07-08 STW012 - Jul 8, 23:05 UTCJul 9, 02:10 UTC3h 5m
2026-07-08 STW011 - Jul 8, 16:25 UTCJul 8, 19:00 UTC2h 35m
2026-07-08 STW002 - Jul 8, 04:45 UTCJul 8, 14:20 UTC9h 35m
2026-07-07 STW011 - Jul 7, 16:25 UTCJul 8, 02:20 UTC9h 55m
2026-07-07 STW142 - Jul 7, 03:50 UTCJul 7, 14:15 UTC10h 25m
2026-07-06 STW023 - Jul 6, 15:45 UTCJul 7, 01:20 UTC9h 35m
2026-07-05 STW011 - Jul 5, 16:30 UTCJul 6, 02:20 UTC9h 50m
2026-07-05 STW002 - Jul 5, 04:30 UTCJul 5, 14:15 UTC9h 45m
2026-07-04 STW125 - Jul 4, 16:25 UTCJul 5, 02:50 UTC10h 25m
2026-07-03 STW125 - Jul 3, 17:00 UTCJul 4, 03:50 UTC10h 50m
2026-07-03 STW141 - Jul 3, 04:00 UTCJul 3, 14:05 UTC10h 5m
2026-07-02 STW023 - Jul 2, 15:00 UTCJul 3, 00:50 UTC9h 50m
2026-07-01 STW126 - Jul 1, 16:55 UTCJul 2, 03:20 UTC10h 25m
2026-07-01 STW001 - Jul 1, 06:15 UTCJul 1, 15:10 UTC8h 55m
2026-06-30 STW024 AYT → AYT Jun 30, 19:20 UTCJul 1, 04:35 UTC9h 15m
2026-06-29 STW125 - Jun 29, 16:10 UTCJun 30, 02:55 UTC10h 46m
2026-06-28 STW225 - Jun 28, 18:10 UTCJun 29, 05:09 UTC11h 0m
2026-06-28 STW001 - Jun 28, 05:24 UTCJun 28, 14:19 UTC8h 55m
2026-06-27 STW125 AYT → AYT Jun 27, 16:59 UTCJun 28, 03:25 UTC10h 25m
2026-06-26 STW023 - Jun 26, 19:55 UTCJun 27, 06:54 UTC11h 0m
2026-06-26 STW002 - Jun 26, 12:19 UTCJun 26, 14:50 UTC2h 30m
2026-06-26 STW001 - Jun 26, 05:24 UTCJun 26, 08:30 UTC3h 5m
2026-06-25 STW012 - Jun 25, 15:44 UTCJun 26, 01:34 UTC9h 50m
2026-06-25 STW141 - Jun 25, 04:10 UTCJun 25, 13:45 UTC9h 35m
2026-06-24 STW8002 - Jun 24, 21:29 UTCJun 24, 23:40 UTC2h 10m
2026-05-29 STW8001 - May 29, 11:00 UTCMay 29, 13:35 UTC2h 35m
2026-05-29 STW226 SVX → AYT May 29, 05:10 UTCMay 29, 05:30 UTC20m
2026-05-28 STW225 AYT → SVX May 28, 18:05 UTCMay 29, 04:30 UTC10h 25m
2026-05-28 STW001 - May 28, 04:55 UTCMay 28, 14:30 UTC9h 35m
2026-05-27 STW024 KZN → AYT May 27, 15:15 UTCMay 28, 01:05 UTC9h 50m
2026-05-27 STW226 SVX → AYT May 27, 04:34 UTCMay 27, 04:55 UTC20m
2026-05-26 STW225 AYT → SVX May 26, 18:10 UTCMay 26, 20:00 UTC1h 50m
2026-05-26 STW002 - May 26, 15:00 UTCMay 26, 15:24 UTC25m
2026-05-26 STW001 - May 26, 05:34 UTCMay 26, 08:04 UTC2h 30m
2026-05-26 STW024 KZN → AYT May 26, 00:29 UTCMay 26, 00:49 UTC20m
2026-05-25 STW023 - May 25, 15:00 UTCMay 25, 21:24 UTC6h 24m
2026-05-25 STW226 SVX → AYT May 25, 04:40 UTCMay 25, 05:00 UTC20m
2026-05-24 STW225 AYT → SVX May 24, 18:15 UTCMay 24, 19:20 UTC1h 5m
2026-05-24 STW002 - May 24, 11:35 UTCMay 24, 14:10 UTC2h 35m
2026-05-24 STW001 - May 24, 05:05 UTCMay 24, 07:40 UTC2h 35m
2026-05-24 STW126 SVX → AYT May 24, 02:40 UTCMay 24, 03:05 UTC25m

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

Mode-S 4B9E55 frequently asked

What is Mode-S code 4B9E55?
4B9E55 is an ICAO 24-bit transponder address. Allocated to Turkey. Assigned to TC-GRU.
Where is Mode-S 4B9E55 registered?
Mode-S code 4B9E55 is allocated to Turkey (TR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B9E55 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B9E55, octal 22717125, decimal 4,955,733.
What flights does 4B9E55 operate?
Mode-S 4B9E55 has broadcast 19 distinct callsigns, including MSC781, MSC782, MSC785, MSC784, STW001.