Apparatus

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sensors Mode-S transponder

4BA18B

ICAO 24-bit transponder address · allocated to Turkey

Currently assigned to TC-HLK · ROBINSON R-22 Mariner

Hex
4BA18B
Octal
22720613
Decimal
4,956,555
Country
TR
Tail
TC-HLK
Type
R22
No current signal · last broadcast 1d ago
Flights observed
44
Distinct callsigns
3
Country
TR
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4BA18B.

Country allocation

The ICAO 24-bit address 4BA18B 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 3 distinct

Callsign Airline Flights Last seen
TCHLK - 38 2026-07-10
KOC66 - 4 2026-06-29
KOC77 - 2 2026-06-29

Recent flights last 44

DateFlightRouteTakeoffLandingDuration
2026-07-10 TCHLK - Jul 10, 09:20 UTCJul 10, 09:55 UTC35m
2026-07-08 TCHLK - Jul 8, 13:10 UTCJul 8, 13:25 UTC15m
2026-07-08 TCHLK - Jul 8, 09:25 UTCJul 8, 10:10 UTC45m
2026-07-08 TCHLK - Jul 8, 08:50 UTCJul 8, 09:00 UTC10m
2026-07-05 TCHLK - Jul 5, 16:10 UTCJul 5, 16:45 UTC35m
2026-07-05 TCHLK - Jul 5, 09:15 UTCJul 5, 09:40 UTC25m
2026-07-02 TCHLK - Jul 2, 15:30 UTCJul 2, 16:15 UTC45m
2026-07-01 TCHLK - Jul 1, 12:40 UTCJul 1, 13:00 UTC20m
2026-07-01 TCHLK - Jul 1, 08:40 UTCJul 1, 09:20 UTC40m
2026-06-30 TCHLK - Jun 30, 14:25 UTCJun 30, 15:15 UTC50m
2026-06-29 KOC77 - Jun 29, 09:40 UTCJun 29, 10:04 UTC25m
2026-06-29 KOC66 - Jun 29, 08:35 UTCJun 29, 08:44 UTC10m
2026-06-27 TCHLK - Jun 27, 12:55 UTCJun 27, 13:15 UTC20m
2026-06-27 TCHLK - Jun 27, 09:29 UTCJun 27, 09:50 UTC20m
2026-06-26 TCHLK - Jun 26, 05:35 UTCJun 26, 06:15 UTC40m
2026-06-25 KOC66 - Jun 25, 12:50 UTCJun 25, 13:40 UTC50m
2026-06-24 TCHLK - Jun 24, 05:34 UTCJun 24, 06:15 UTC40m
2026-06-23 TCHLK - Jun 23, 11:35 UTCJun 23, 12:05 UTC30m
2026-06-23 TCHLK - Jun 23, 08:50 UTCJun 23, 09:34 UTC45m
2026-06-23 TCHLK - Jun 23, 05:59 UTCJun 23, 06:55 UTC55m
2026-06-22 TCHLK - Jun 22, 10:00 UTCJun 22, 10:25 UTC25m
2026-06-21 TCHLK - Jun 21, 08:35 UTCJun 21, 08:44 UTC10m
2026-06-21 TCHLK - Jun 21, 06:50 UTCJun 21, 07:45 UTC55m
2026-06-19 KOC66 - Jun 19, 12:54 UTCJun 19, 13:04 UTC10m
2026-06-17 KOC77 - Jun 17, 17:05 UTCJun 17, 17:35 UTC30m
2026-06-17 KOC66 - Jun 17, 16:00 UTCJun 17, 16:10 UTC10m
2026-06-16 TCHLK - Jun 16, 13:34 UTCJun 16, 14:09 UTC35m
2026-06-16 TCHLK - Jun 16, 06:50 UTCJun 16, 07:25 UTC35m
2026-06-15 TCHLK - Jun 15, 08:20 UTCJun 15, 09:25 UTC1h 5m
2026-06-14 TCHLK - Jun 14, 09:40 UTCJun 14, 10:20 UTC40m
2026-06-14 TCHLK - Jun 14, 07:00 UTCJun 14, 08:10 UTC1h 10m
2026-06-13 TCHLK - Jun 13, 15:40 UTCJun 13, 16:45 UTC1h 5m
2026-06-11 TCHLK - Jun 11, 13:05 UTCJun 11, 13:40 UTC35m
2026-06-11 TCHLK - Jun 11, 12:15 UTCJun 11, 12:30 UTC15m
2026-06-10 TCHLK - Jun 10, 13:50 UTCJun 10, 14:30 UTC40m
2026-06-08 TCHLK - Jun 8, 05:55 UTCJun 8, 06:30 UTC35m
2026-06-06 TCHLK - Jun 6, 08:15 UTCJun 6, 08:25 UTC10m
2026-06-06 TCHLK - Jun 6, 06:55 UTCJun 6, 07:05 UTC10m
2026-06-02 TCHLK - Jun 2, 09:45 UTCJun 2, 11:05 UTC1h 20m
2026-05-27 TCHLK - May 27, 12:35 UTCMay 27, 13:05 UTC30m
2026-05-20 TCHLK - May 20, 06:20 UTCMay 20, 06:45 UTC25m
2026-05-18 TCHLK - May 18, 07:50 UTCMay 18, 08:20 UTC30m
2026-04-26 TCHLK - Apr 26, 07:05 UTCApr 26, 07:30 UTC25m
2026-04-26 TCHLK - Apr 26, 06:15 UTCApr 26, 06:30 UTC15m

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

Mode-S 4BA18B frequently asked

What is Mode-S code 4BA18B?
4BA18B is an ICAO 24-bit transponder address. Allocated to Turkey. Assigned to TC-HLK.
Where is Mode-S 4BA18B registered?
Mode-S code 4BA18B is allocated to Turkey (TR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4BA18B broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4BA18B, octal 22720613, decimal 4,956,555.
What flights does 4BA18B operate?
Mode-S 4BA18B has broadcast 3 distinct callsigns, including TCHLK, KOC66, KOC77.