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 Jul 26, 21:15 UTC
Flights observed
216
Distinct callsigns
20
Country
TR
Last broadcast
Jul 26, 21:15 UTC

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 20 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
STW023 - 15 2026-07-26
STW225 - 9 2026-07-21
STW001 - 9 2026-07-12
STW142 South West Air Corporation 8 2026-07-24
STW125 - 8 2026-07-13
STW002 - 8 2026-07-25
STW024 South West Air Corporation 7 2026-07-24
STW226 - 5 2026-07-12
STW141 - 4 2026-07-16
STW126 South West Air Corporation 4 2026-07-25
STW012 - 4 2026-07-17
STW011 - 4 2026-07-10
STW8784 - 1 2026-05-16
STW8002 - 1 2026-06-24
STW8001 - 1 2026-05-29
STW1024 - 1 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 STW023 - Jul 26, 15:20 UTCJul 26, 21:15 UTC5h 55m
2026-07-25 STW126 SVX → AYT Jul 25, 16:45 UTCJul 26, 03:05 UTC10h 20m
2026-07-25 STW002 - Jul 25, 05:05 UTCJul 25, 14:55 UTC9h 50m
2026-07-24 STW024 KZN → AYT Jul 24, 16:50 UTCJul 25, 03:15 UTC10h 25m
2026-07-24 STW142 SVO → AYT Jul 24, 04:10 UTCJul 24, 14:30 UTC10h 20m
2026-07-23 STW023 - Jul 23, 15:15 UTCJul 24, 01:05 UTC9h 50m
2026-07-22 STW023 - Jul 22, 15:20 UTCJul 23, 01:20 UTC10h 0m
2026-07-21 STW225 - Jul 21, 18:25 UTCJul 22, 04:50 UTC10h 25m
2026-07-21 STW142 SVO → AYT Jul 21, 04:00 UTCJul 21, 14:10 UTC10h 10m
2026-07-20 STW023 - Jul 20, 15:15 UTCJul 21, 01:05 UTC9h 49m
2026-07-19 STW225 AYT → AYT Jul 19, 18:20 UTCJul 20, 05:05 UTC10h 45m
2026-07-19 STW002 - Jul 19, 05:10 UTCJul 19, 14:30 UTC9h 20m
2026-07-18 STW023 - Jul 18, 17:05 UTCJul 19, 02:45 UTC9h 40m
2026-07-18 STW142 - Jul 18, 04:20 UTCJul 18, 13:35 UTC9h 15m
2026-07-17 STW012 - Jul 17, 16:40 UTCJul 18, 02:35 UTC9h 55m
2026-07-17 STW142 - Jul 17, 03:59 UTCJul 17, 13:50 UTC9h 50m
2026-07-16 STW1024 - Jul 16, 23:49 UTCJul 17, 01:20 UTC1h 30m
2026-07-16 STW023 - Jul 16, 15:25 UTCJul 16, 18:29 UTC3h 5m
2026-07-16 STW142 - Jul 16, 10:59 UTCJul 16, 13:49 UTC2h 50m
2026-07-16 STW141 - Jul 16, 04:00 UTCJul 16, 07:00 UTC3h 0m
2026-07-15 STW023 - Jul 15, 15:50 UTCJul 16, 01:15 UTC9h 25m
2026-07-15 STW142 - Jul 15, 04:00 UTCJul 15, 14:00 UTC10h 0m
2026-07-14 STW023 - Jul 14, 15:10 UTCJul 15, 01:05 UTC9h 54m
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

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 Jul 26, 21:15 UTC.
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 20 distinct callsigns, including MSC781, MSC782, MSC785, MSC784, STW023.