sensors Mode-S transponder

4B9C61

ICAO 24-bit transponder address · allocated to Turkey

Currently assigned to TC-GCA · AIRBUS A-321

Hex
4B9C61
Octal
22716141
Decimal
4,955,233
Country
TR
Tail
TC-GCA
Type
A321
No current signal · last broadcast 13h ago
Flights observed
45
Distinct callsigns
20
Country
TR
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S 4B9C61.

Country allocation

The ICAO 24-bit address 4B9C61 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
BBT412 - 4 2026-05-23
BBT416 - 3 2026-05-25
BBT759 - 2 2026-04-17
BBT414 - 2 2026-05-24
BBT213 - 2 2026-05-25
BBT917 - 1 2026-05-10
BBT916 - 1 2026-05-10
BBT915 - 1 2026-05-09
BBT795 - 1 2026-06-02
BBT794 - 1 2026-06-02
BBT793 - 1 2026-06-01
BBT792 - 1 2026-06-01
BBT791 - 1 2026-05-31
BBT760 - 1 2026-04-17
BBT713 - 1 2026-05-17
BBT711 - 1 2026-05-17
BBT612 - 1 2026-05-22
BBT611 - 1 2026-05-16
BBT450 - 1 2026-06-07
BBT449 - 1 2026-06-07

Recent flights last 45

DateFlightRouteTakeoffLandingDuration
2026-06-07 BBT450 - Jun 7, 05:45 UTCJun 7, 08:55 UTC3h 10m
2026-06-07 BBT449 - Jun 7, 01:09 UTCJun 7, 04:20 UTC3h 10m
2026-06-06 BBT448 - Jun 6, 05:20 UTCJun 6, 08:55 UTC3h 35m
2026-06-06 BBT447 - Jun 6, 01:00 UTCJun 6, 04:10 UTC3h 10m
2026-06-05 BBT446 - Jun 5, 10:20 UTCJun 5, 13:30 UTC3h 10m
2026-06-05 BBT445 - Jun 5, 04:15 UTCJun 5, 07:35 UTC3h 20m
2026-06-04 BBT444 - Jun 4, 16:50 UTCJun 4, 21:30 UTC4h 40m
2026-06-02 BBT795 - Jun 2, 18:15 UTCJun 2, 20:35 UTC2h 20m
2026-06-02 BBT794 - Jun 2, 13:40 UTCJun 2, 16:45 UTC3h 5m
2026-06-01 BBT793 - Jun 1, 18:45 UTCJun 1, 22:05 UTC3h 20m
2026-06-01 BBT792 - Jun 1, 14:20 UTCJun 1, 17:20 UTC3h 0m
2026-05-31 BBT791 - May 31, 21:25 UTCJun 1, 01:25 UTC4h 0m
2026-05-25 BBT213 - May 25, 20:19 UTCMay 26, 15:14 UTC18h 55m
2026-05-25 BBT213 - May 25, 19:44 UTCMay 26, 15:14 UTC19h 30m
2026-05-25 BBT416 - May 25, 14:25 UTCMay 25, 17:15 UTC2h 50m
2026-05-24 BBT416 - May 24, 20:20 UTCMay 25, 17:15 UTC20h 55m
2026-05-24 BBT416 BEG → BEG May 24, 20:00 UTCMay 25, 17:15 UTC21h 15m
2026-05-24 BBT415 BEG → BEG May 24, 18:00 UTCMay 24, 19:45 UTC1h 45m
2026-05-24 BBT414 BEG → BEG May 24, 02:10 UTCMay 24, 17:50 UTC15h 40m
2026-05-23 BBT412 - May 23, 22:10 UTCMay 24, 00:15 UTC2h 5m
2026-05-23 BBT412 - May 23, 02:20 UTCMay 24, 00:15 UTC21h 55m
2026-05-23 BBT412 BEG → BEG May 23, 01:20 UTCMay 24, 00:15 UTC22h 55m
2026-05-22 BBT612 - May 22, 09:50 UTCMay 22, 23:10 UTC13h 20m
2026-05-21 BBT414 - May 21, 09:30 UTCMay 21, 18:15 UTC8h 45m
2026-05-20 BBT412 - May 20, 22:00 UTCMay 21, 06:35 UTC8h 35m
2026-05-20 BBT312 - May 20, 02:55 UTCMay 20, 19:15 UTC16h 21m
2026-05-19 BBT214 - May 19, 08:10 UTCMay 20, 00:00 UTC15h 50m
2026-05-19 BBT212 - May 19, 02:35 UTCMay 19, 04:35 UTC2h 0m
2026-05-18 BBT211 - May 18, 20:20 UTCMay 18, 22:10 UTC1h 50m
2026-05-18 BBT111 - May 18, 09:45 UTCMay 18, 18:15 UTC8h 30m
2026-05-17 BBT713 - May 17, 22:55 UTCMay 18, 07:55 UTC9h 0m
2026-05-17 BBT711 - May 17, 12:30 UTCMay 17, 21:10 UTC8h 40m
2026-05-16 BBT611 - May 16, 23:40 UTCMay 17, 10:55 UTC11h 15m
2026-05-16 BBT410 - May 16, 01:10 UTCMay 16, 03:00 UTC1h 50m
2026-05-10 BBT917 - May 10, 16:44 UTCMay 10, 19:05 UTC2h 20m
2026-05-10 BBT916 - May 10, 10:30 UTCMay 10, 13:05 UTC2h 35m
2026-05-09 BBT915 - May 9, 15:35 UTCMay 9, 20:15 UTC4h 40m
2026-05-05 BBT127 - May 5, 11:35 UTCMay 5, 13:25 UTC1h 50m
2026-05-05 BBT126 - May 5, 06:45 UTCMay 5, 08:50 UTC2h 5m
2026-05-04 BBT125 - May 4, 15:05 UTCMay 4, 18:40 UTC3h 36m
2026-04-23 BBT396 - Apr 23, 15:25 UTCApr 23, 19:20 UTC3h 54m
2026-04-22 BBT395 - Apr 22, 22:10 UTCApr 23, 02:25 UTC4h 15m
2026-04-17 BBT760 - Apr 17, 09:45 UTCApr 17, 10:40 UTC55m
2026-04-17 BBT759 - Apr 17, 07:20 UTCApr 17, 07:30 UTC10m
2026-04-17 BBT759 - Apr 17, 05:50 UTCApr 17, 07:15 UTC1h 25m

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

Mode-S 4B9C61 frequently asked

What is Mode-S code 4B9C61?
4B9C61 is an ICAO 24-bit transponder address. Allocated to Turkey. Assigned to TC-GCA.
Where is Mode-S 4B9C61 registered?
Mode-S code 4B9C61 is allocated to Turkey (TR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B9C61 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B9C61, octal 22716141, decimal 4,955,233.
What flights does 4B9C61 operate?
Mode-S 4B9C61 has broadcast 20 distinct callsigns, including BBT412, BBT416, BBT759, BBT414, BBT213.