Apparatus

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sensors Mode-S transponder

4BAB23

ICAO 24-bit transponder address · allocated to Turkey

Currently assigned to TC-JYC · BOEING 737-900

Hex
4BAB23
Octal
22725443
Decimal
4,959,011
Country
TR
Tail
TC-JYC
Type
B739
No current signal · last broadcast 2h ago
Flights observed
152
Distinct callsigns
20
Country
TR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 4BAB23.

Country allocation

The ICAO 24-bit address 4BAB23 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
THY8GS Turkish Airlines 7 2026-05-30
THY4AV Turkish Airlines 6 2026-05-30
THY845 Turkish Airlines 5 2026-05-26
THY2QT - 5 2026-05-26
THY1140 Turkish Airlines 4 2026-05-15
THY1139 Turkish Airlines 4 2026-05-15
THY846 Turkish Airlines 3 2026-05-13
THY6RZ Turkish Airlines 3 2026-05-26
THY4AQ - 3 2026-05-18
THY9VU Turkish Airlines 2 2026-05-01
THY9GU Turkish Airlines 2 2026-05-17
THY9EU Turkish Airlines 2 2026-05-06
THY90L Turkish Airlines 2 2026-05-21
THY8SF Turkish Airlines 2 2026-05-06
THY8ES Turkish Airlines 2 2026-04-20
THY844 Turkish Airlines 2 2026-05-20
THY7LX Turkish Airlines 2 2026-04-20
THY4PR Turkish Airlines 2 2026-05-01
THY3ZY - 2 2026-04-13
THY3ZJ Turkish Airlines 2 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 THY7QW ZRH → IST May 30, 10:45 UTCMay 30, 13:45 UTC3h 0m
2026-05-30 THY8GS TZX → IST May 30, 07:00 UTCMay 30, 07:30 UTC30m
2026-05-30 THY8GS TZX → IST May 30, 05:50 UTCMay 30, 06:25 UTC35m
2026-05-30 THY4AV IST → TZX May 30, 04:35 UTCMay 30, 04:50 UTC15m
2026-05-30 THY4AV IST → TZX May 30, 03:30 UTCMay 30, 04:00 UTC30m
2026-05-29 THY1TU IST → GZT May 29, 18:50 UTCMay 29, 20:25 UTC1h 35m
2026-05-29 THY7SP IST → BJV May 29, 15:30 UTCMay 29, 17:10 UTC1h 40m
2026-05-29 THY5VQ IST → DUB May 29, 07:15 UTCMay 29, 11:00 UTC3h 45m
2026-05-28 THY8CJ CAI → IST May 28, 19:35 UTCMay 28, 21:30 UTC1h 55m
2026-05-28 THY4YM IST → CAI May 28, 16:10 UTCMay 28, 17:40 UTC1h 30m
2026-05-27 THY7RC - May 27, 17:55 UTCMay 27, 21:20 UTC3h 25m
2026-05-27 THY8GS TZX → IST May 27, 06:49 UTCMay 27, 07:00 UTC11m
2026-05-27 THY8GS TZX → IST May 27, 05:40 UTCMay 27, 06:09 UTC30m
2026-05-27 THY4AV IST → TZX May 27, 04:24 UTCMay 27, 04:34 UTC10m
2026-05-26 THY2QT - May 26, 19:20 UTCMay 26, 19:34 UTC15m
2026-05-26 THY2QT - May 26, 17:59 UTCMay 26, 18:40 UTC40m
2026-05-26 THY6RZ WAW → IST May 26, 16:15 UTCMay 26, 16:30 UTC15m
2026-05-26 THY845 ALP → IST May 26, 09:29 UTCMay 26, 09:40 UTC10m
2026-05-25 THY2XK GZT → IST May 25, 18:45 UTCMay 25, 18:55 UTC10m
2026-05-25 THY3NS IST → GZT May 25, 15:25 UTCMay 25, 15:35 UTC10m
2026-05-25 THY845 ALP → IST May 25, 09:45 UTCMay 25, 10:00 UTC15m
2026-05-24 THY5AQ AYT → IST May 24, 17:20 UTCMay 24, 19:55 UTC2h 35m
2026-05-24 THY3TW IST → MRS May 24, 13:20 UTCMay 24, 15:55 UTC2h 35m
2026-05-24 THY55C IST → VIE May 24, 08:20 UTCMay 24, 08:40 UTC20m
2026-05-24 THY1HM IST → TZX May 24, 06:45 UTCMay 24, 07:10 UTC25m
2026-05-24 THY1HM IST → TZX May 24, 05:45 UTCMay 24, 05:55 UTC10m
2026-05-24 THY1HU MXP → IST May 24, 02:20 UTCMay 24, 02:35 UTC15m
2026-05-23 THY4178 IST → GNY May 23, 13:00 UTCMay 23, 13:10 UTC10m
2026-05-23 THY845 ALP → IST May 23, 09:35 UTCMay 23, 09:45 UTC10m
2026-05-22 THY5ZC ADB → IST May 22, 14:15 UTCMay 22, 14:55 UTC40m
2026-05-22 THY9JV ORN → IST May 22, 12:20 UTCMay 22, 12:50 UTC30m
2026-05-22 THY845 ALP → IST May 22, 09:50 UTCMay 22, 10:00 UTC10m
2026-05-22 THY7XR IST → TLS May 22, 01:50 UTCMay 22, 02:00 UTC10m
2026-05-21 THY6BW - May 21, 16:35 UTCMay 21, 16:45 UTC10m
2026-05-21 THY2PX CND → IST May 21, 13:10 UTCMay 21, 13:20 UTC10m
2026-05-21 THY2BQ PRN → IST May 21, 08:35 UTCMay 21, 09:20 UTC45m
2026-05-21 THY90L IST → PRN May 21, 05:25 UTCMay 21, 06:05 UTC40m
2026-05-20 THY8BC BHX → IST May 20, 17:15 UTCMay 20, 20:20 UTC3h 5m
2026-05-20 THY2XW IST → STR May 20, 12:20 UTCMay 20, 15:45 UTC3h 25m
2026-05-20 THY845 ALP → IST May 20, 10:10 UTCMay 20, 10:30 UTC20m
2026-05-20 THY844 IST → ALP May 20, 05:25 UTCMay 20, 05:40 UTC15m
2026-05-19 THY2QT - May 19, 19:10 UTCMay 19, 19:20 UTC10m
2026-05-19 THY2QT - May 19, 17:35 UTCMay 19, 18:15 UTC40m
2026-05-19 THY6RZ WAW → IST May 19, 15:10 UTCMay 19, 16:25 UTC1h 15m
2026-05-19 THY2VS IST → ESB May 19, 10:50 UTCMay 19, 11:00 UTC10m
2026-05-19 THY2VS IST → ESB May 19, 10:00 UTCMay 19, 10:15 UTC15m
2026-05-19 THY3RB IST → AYT May 19, 07:55 UTCMay 19, 08:35 UTC40m
2026-05-19 THY1HU MXP → IST May 19, 02:25 UTCMay 19, 02:35 UTC10m
2026-05-18 THY8NU - May 18, 23:20 UTCMay 18, 23:30 UTC10m
2026-05-18 THY2LJ - May 18, 19:30 UTCMay 18, 20:05 UTC35m

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

Mode-S 4BAB23 frequently asked

What is Mode-S code 4BAB23?
4BAB23 is an ICAO 24-bit transponder address. Allocated to Turkey. Assigned to TC-JYC.
Where is Mode-S 4BAB23 registered?
Mode-S code 4BAB23 is allocated to Turkey (TR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4BAB23 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4BAB23, octal 22725443, decimal 4,959,011.
What flights does 4BAB23 operate?
Mode-S 4BAB23 has broadcast 20 distinct callsigns, including THY8GS, THY4AV, THY845, THY2QT, THY1140.