Apparatus

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sensors Mode-S transponder

4C0242

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-ASC · ATR-72-600

Hex
4C0242
Octal
23001102
Decimal
4,981,314
Country
RS
Tail
YU-ASC
Type
AT76
No current signal · last broadcast 2h ago
Flights observed
233
Distinct callsigns
20
Country
RS
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 4C0242.

Country allocation

The ICAO 24-bit address 4C0242 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 20 distinct

Callsign Airline Flights Last seen
ASL72Q Spurling Aviation 8 2026-05-25
ASL97E Spurling Aviation 7 2026-05-25
ASL18R Spurling Aviation 7 2026-05-29
ASL80A Spurling Aviation 6 2026-05-18
ASL79Y Spurling Aviation 6 2026-05-27
ASL78U Spurling Aviation 6 2026-05-29
ASL45B Spurling Aviation 6 2026-05-21
ASL44Q Spurling Aviation 6 2026-05-18
ASL33K Spurling Aviation 6 2026-05-27
ASL96B Spurling Aviation 5 2026-05-23
ASL92Z Spurling Aviation 5 2026-05-21
ASL79N Spurling Aviation 5 2026-05-24
ASL68B Spurling Aviation 5 2026-05-24
ASL59D Spurling Aviation 5 2026-05-22
ASL47G Spurling Aviation 5 2026-05-27
ASL33J Spurling Aviation 5 2026-05-28
ASL77J Spurling Aviation 4 2026-05-18
ASL73P Spurling Aviation 4 2026-05-17
ASL68A Spurling Aviation 4 2026-05-25
ASL48D Spurling Aviation 4 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 ASL36C - May 30, 13:40 UTCMay 30, 14:10 UTC30m
2026-05-30 ASL2429 IST → KVO May 30, 11:15 UTCMay 30, 13:05 UTC1h 50m
2026-05-30 ASL2428 KVO → IST May 30, 08:00 UTCMay 30, 09:25 UTC1h 25m
2026-05-30 ASL78V FCO → BEG May 30, 06:35 UTCMay 30, 06:50 UTC15m
2026-05-30 ASL12E BEG → OPO May 30, 01:30 UTCMay 30, 02:50 UTC1h 20m
2026-05-29 ASL24B BER → BEG May 29, 22:55 UTCMay 30, 00:10 UTC1h 15m
2026-05-29 ASL18W ZAG → BEG May 29, 20:25 UTCMay 29, 21:15 UTC50m
2026-05-29 ASL31J BEG → ZAG May 29, 18:35 UTCMay 29, 19:25 UTC50m
2026-05-29 ASL61J BEG → TIV May 29, 13:00 UTCMay 29, 14:10 UTC1h 10m
2026-05-29 ASL77B BEG → BRU May 29, 10:55 UTCMay 29, 12:15 UTC1h 20m
2026-05-29 ASL78U PRG → BEG May 29, 07:30 UTCMay 29, 09:10 UTC1h 40m
2026-05-29 ASL18R BEG → PRG May 29, 04:35 UTCMay 29, 06:25 UTC1h 50m
2026-05-28 ASL47F PRG → BEG May 28, 18:50 UTCMay 28, 20:30 UTC1h 40m
2026-05-28 ASL89R BEG → PRG May 28, 16:10 UTCMay 28, 18:00 UTC1h 50m
2026-05-28 ASL51D ZAG → BEG May 28, 13:25 UTCMay 28, 14:15 UTC50m
2026-05-28 ASL30J BEG → ZAG May 28, 11:35 UTCMay 28, 12:30 UTC55m
2026-05-28 ASL77W - May 28, 07:45 UTCMay 28, 09:20 UTC1h 35m
2026-05-28 ASL36Q BEG → VCE May 28, 04:55 UTCMay 28, 06:35 UTC1h 40m
2026-05-28 ASL33J INI → BEG May 28, 02:15 UTCMay 28, 02:50 UTC35m
2026-05-27 ASL47G BEG → SKP May 27, 23:05 UTCMay 27, 23:40 UTC35m
2026-05-27 ASL33K SKP → BEG May 27, 13:35 UTCMay 27, 14:15 UTC40m
2026-05-27 ASL79Y VIE → BEG May 27, 11:25 UTCMay 27, 12:05 UTC40m
2026-05-26 ASL37Z VIE → BEG May 26, 18:55 UTCMay 26, 20:05 UTC1h 10m
2026-05-26 ASL45T BEG → VIE May 26, 16:45 UTCMay 26, 17:55 UTC1h 10m
2026-05-26 ASL87Q SKP → BEG May 26, 13:10 UTCMay 26, 14:14 UTC1h 5m
2026-05-26 ASL56C FCO → BEG May 26, 11:20 UTCMay 26, 12:05 UTC45m
2026-05-26 ASL78U PRG → BEG May 26, 07:34 UTCMay 26, 09:25 UTC1h 50m
2026-05-26 ASL18R BEG → PRG May 26, 04:39 UTCMay 26, 06:34 UTC1h 55m
2026-05-25 ASL47F PRG → BEG May 25, 19:00 UTCMay 25, 20:34 UTC1h 34m
2026-05-25 ASL89R BEG → PRG May 25, 16:05 UTCMay 25, 17:50 UTC1h 45m
2026-05-25 ASL97E BUD → BEG May 25, 13:35 UTCMay 25, 14:30 UTC55m
2026-05-25 ASL72Q BEG → BUD May 25, 11:55 UTCMay 25, 12:40 UTC45m
2026-05-25 ASL157 KRK → BEG May 25, 07:20 UTCMay 25, 08:35 UTC1h 15m
2026-05-25 ASL156 BEG → KRK May 25, 04:35 UTCMay 25, 06:10 UTC1h 35m
2026-05-25 ASL68A SOF → BEG May 25, 02:10 UTCMay 25, 03:00 UTC50m
2026-05-24 ASL15J BEG → SOF May 24, 23:00 UTCMay 24, 23:46 UTC46m
2026-05-24 ASL68B BEG → PRG May 24, 18:40 UTCMay 24, 20:15 UTC1h 35m
2026-05-24 ASL79N BEG → VCE May 24, 16:15 UTCMay 24, 17:45 UTC1h 30m
2026-05-24 ASL51D ZAG → BEG May 24, 13:30 UTCMay 24, 14:25 UTC55m
2026-05-24 ASL30J BEG → ZAG May 24, 11:45 UTCMay 24, 12:30 UTC45m
2026-05-23 ASL87Q SKP → BEG May 23, 13:15 UTCMay 23, 14:20 UTC1h 5m
2026-05-23 ASL56C FCO → BEG May 23, 11:40 UTCMay 23, 12:35 UTC55m
2026-05-23 ASL96B BEG → BLQ May 23, 02:05 UTCMay 23, 03:00 UTC54m
2026-05-22 ASL59D BEG → TIA May 22, 22:50 UTCMay 22, 23:45 UTC55m
2026-05-22 ASL10N LJU → BEG May 22, 19:15 UTCMay 22, 20:25 UTC1h 10m
2026-05-22 ASL72L BEG → TIA May 22, 17:20 UTCMay 22, 18:20 UTC1h 0m
2026-05-22 ASL33K SKP → BEG May 22, 15:30 UTCMay 22, 16:05 UTC35m
2026-05-22 ASL79Y VIE → BEG May 22, 13:20 UTCMay 22, 13:55 UTC35m
2026-05-22 ASL78U PRG → BEG May 22, 07:30 UTCMay 22, 09:10 UTC1h 40m
2026-05-22 ASL18R BEG → PRG May 22, 04:40 UTCMay 22, 06:20 UTC1h 40m

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

Mode-S 4C0242 frequently asked

What is Mode-S code 4C0242?
4C0242 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-ASC.
Where is Mode-S 4C0242 registered?
Mode-S code 4C0242 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C0242 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 4C0242, octal 23001102, decimal 4,981,314.
What flights does 4C0242 operate?
Mode-S 4C0242 has broadcast 20 distinct callsigns, including ASL72Q, ASL97E, ASL18R, ASL80A, ASL79Y.