Apparatus

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sensors Mode-S transponder

4C011C

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-A051 · FLIGHT DESIGN CT

Hex
4C011C
Octal
23000434
Decimal
4,981,020
Country
RS
Tail
YU-A051
Type
FDCT
No current signal · last broadcast 8h ago
Flights observed
39
Distinct callsigns
1
Country
RS
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 4C011C.

Country allocation

The ICAO 24-bit address 4C011C falls within the block assigned to Serbia (RS) by ICAO Annex 10, Volume III. Every aircraft registered in Serbia 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 1 distinct

Callsign Airline Flights Last seen
YUA051 - 39 2026-07-10

Recent flights last 39

DateFlightRouteTakeoffLandingDuration
2026-07-10 YUA051 - Jul 10, 12:00 UTCJul 10, 12:20 UTC20m
2026-07-10 YUA051 - Jul 10, 10:05 UTCJul 10, 10:20 UTC15m
2026-07-05 YUA051 - Jul 5, 11:40 UTCJul 5, 12:40 UTC1h 0m
2026-07-04 YUA051 - Jul 4, 04:10 UTCJul 4, 05:45 UTC1h 35m
2026-06-27 YUA051 - Jun 27, 11:50 UTCJun 27, 12:04 UTC15m
2026-06-27 YUA051 - Jun 27, 09:44 UTCJun 27, 10:05 UTC20m
2026-06-25 YUA051 - Jun 25, 15:54 UTCJun 25, 16:55 UTC1h 0m
2026-06-25 YUA051 - Jun 25, 13:05 UTCJun 25, 14:39 UTC1h 35m
2026-06-25 YUA051 - Jun 25, 05:44 UTCJun 25, 07:34 UTC1h 50m
2026-06-25 YUA051 - Jun 25, 03:54 UTCJun 25, 04:25 UTC30m
2026-06-22 YUA051 - Jun 22, 07:19 UTCJun 22, 07:49 UTC30m
2026-06-21 YUA051 - Jun 21, 13:39 UTCJun 21, 15:09 UTC1h 30m
2026-06-21 YUA051 - Jun 21, 09:49 UTCJun 21, 11:34 UTC1h 45m
2026-06-21 YUA051 - Jun 21, 08:20 UTCJun 21, 09:00 UTC40m
2026-06-21 YUA051 - Jun 21, 05:20 UTCJun 21, 07:09 UTC1h 50m
2026-06-20 YUA051 - Jun 20, 15:34 UTCJun 20, 16:14 UTC40m
2026-06-20 YUA051 - Jun 20, 07:54 UTCJun 20, 08:34 UTC40m
2026-06-19 YUA051 - Jun 19, 15:14 UTCJun 19, 15:24 UTC10m
2026-06-19 YUA051 - Jun 19, 12:29 UTCJun 19, 12:49 UTC20m
2026-06-17 YUA051 - Jun 17, 16:00 UTCJun 17, 16:40 UTC40m
2026-06-17 YUA051 - Jun 17, 06:40 UTCJun 17, 07:20 UTC40m
2026-06-16 YUA051 - Jun 16, 12:05 UTCJun 16, 12:25 UTC20m
2026-06-16 YUA051 - Jun 16, 08:30 UTCJun 16, 08:49 UTC20m
2026-06-14 YUA051 - Jun 14, 10:05 UTCJun 14, 11:00 UTC55m
2026-06-14 YUA051 - Jun 14, 05:20 UTCJun 14, 06:00 UTC40m
2026-06-13 YUA051 - Jun 13, 14:45 UTCJun 13, 15:15 UTC30m
2026-06-13 YUA051 - Jun 13, 06:35 UTCJun 13, 07:15 UTC40m
2026-06-06 YUA051 - Jun 6, 16:30 UTCJun 6, 16:45 UTC15m
2026-06-06 YUA051 - Jun 6, 15:05 UTCJun 6, 15:25 UTC20m
2026-06-02 YUA051 - Jun 2, 10:50 UTCJun 2, 11:10 UTC20m
2026-06-02 YUA051 - Jun 2, 09:15 UTCJun 2, 09:30 UTC15m
2026-05-30 YUA051 - May 30, 06:25 UTCMay 30, 06:35 UTC10m
2026-05-27 YUA051 - May 27, 11:15 UTCMay 27, 11:40 UTC25m
2026-05-27 YUA051 - May 27, 07:55 UTCMay 27, 08:15 UTC20m
2026-05-26 YUA051 - May 26, 12:10 UTCMay 26, 12:24 UTC15m
2026-05-26 YUA051 - May 26, 10:14 UTCMay 26, 10:34 UTC20m
2026-05-24 YUA051 - May 24, 05:00 UTCMay 24, 05:45 UTC45m
2026-05-23 YUA051 - May 23, 13:45 UTCMay 23, 14:05 UTC20m
2026-05-23 YUA051 - May 23, 09:25 UTCMay 23, 09:45 UTC20m

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 YU-A051 page for operator, model, and routing details .

Mode-S 4C011C frequently asked

What is Mode-S code 4C011C?
4C011C is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-A051.
Where is Mode-S 4C011C registered?
Mode-S code 4C011C is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C011C broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C011C, octal 23000434, decimal 4,981,020.
What flights does 4C011C operate?
Mode-S 4C011C has broadcast 1 distinct callsign, including YUA051.