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
Broadcasting now · callsign ASL73P · 16,000 ft
Flights observed
534
Distinct callsigns
20
Country
RS
Last broadcast
Jul 26, 18:00 UTC

Current position

4C0242 is currently broadcasting. Map zoomed to live position.

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 - 19 2026-07-25
ASL97E Spurling Aviation 18 2026-07-25
ASL44Q Spurling Aviation 17 2026-07-24
ASL80A Spurling Aviation 16 2026-07-24
ASL77B Spurling Aviation 12 2026-07-24
ASL61J Spurling Aviation 12 2026-07-24
ASL47G Spurling Aviation 11 2026-07-22
ASL45T Spurling Aviation 11 2026-07-17
ASL45B - 11 2026-07-14
ASL37Z - 11 2026-07-17
ASL33J Spurling Aviation 11 2026-07-23
ASL92Z - 10 2026-07-14
ASL79Y - 10 2026-07-22
ASL73P Spurling Aviation 10 2026-07-18
ASL47P Spurling Aviation 10 2026-07-21
ASL34Q Spurling Aviation 10 2026-07-18
ASL33K - 10 2026-07-22
ASL26X - 10 2026-07-21
ASL96B - 8 2026-07-13
ASL59D - 8 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL59E BUD → BEG Jul 26, 17:15 UTCJul 26, 18:00 UTC45m
2026-07-26 ASL57U BEG → BUD Jul 26, 15:20 UTCJul 26, 16:05 UTC45m
2026-07-26 ASL48F BEG → LCA Jul 26, 10:30 UTCJul 26, 10:45 UTC15m
2026-07-26 ASL40T - Jul 26, 07:40 UTCJul 26, 08:55 UTC1h 15m
2026-07-26 ASL14D BEG → OPO Jul 26, 05:15 UTCJul 26, 06:35 UTC1h 21m
2026-07-25 ASL93T LJU → INI Jul 25, 19:30 UTCJul 25, 20:40 UTC1h 10m
2026-07-25 ASL26T INI → LJU Jul 25, 17:10 UTCJul 25, 18:40 UTC1h 30m
2026-07-25 ASL99C BEG → TBS Jul 25, 15:30 UTCJul 25, 16:10 UTC40m
2026-07-25 ASL97E BUD → BEG Jul 25, 13:40 UTCJul 25, 14:35 UTC55m
2026-07-25 ASL72Q - Jul 25, 11:55 UTCJul 25, 12:55 UTC1h 0m
2026-07-25 ASL68A SOF → BEG Jul 25, 02:10 UTCJul 25, 03:05 UTC55m
2026-07-24 ASL15J BEG → SOF Jul 24, 23:30 UTCJul 25, 00:25 UTC55m
2026-07-24 ASL61J BEG → TIV Jul 24, 13:30 UTCJul 24, 14:40 UTC1h 10m
2026-07-24 ASL77B BEG → BRU Jul 24, 11:15 UTCJul 24, 12:35 UTC1h 20m
2026-07-24 ASL44Q VIE → BEG Jul 24, 08:55 UTCJul 24, 10:05 UTC1h 10m
2026-07-24 ASL80A BEG → CPH Jul 24, 05:40 UTCJul 24, 06:50 UTC1h 10m
2026-07-24 ASL68A SOF → BEG Jul 24, 02:10 UTCJul 24, 03:05 UTC55m
2026-07-23 ASL15J BEG → SOF Jul 23, 22:55 UTCJul 23, 23:50 UTC55m
2026-07-23 ASL33J INI → BEG Jul 23, 02:00 UTCJul 23, 02:40 UTC40m
2026-07-22 ASL47G BEG → SKP Jul 22, 23:00 UTCJul 22, 23:35 UTC35m
2026-07-22 ASL47F PRG → BEG Jul 22, 18:50 UTCJul 22, 20:30 UTC1h 40m
2026-07-22 ASL89R BEG → PRG Jul 22, 16:00 UTCJul 22, 17:50 UTC1h 50m
2026-07-22 ASL33K - Jul 22, 13:50 UTCJul 22, 14:25 UTC35m
2026-07-22 ASL79Y - Jul 22, 11:45 UTCJul 22, 12:20 UTC35m
2026-07-21 ASL10N LJU → BEG Jul 21, 19:00 UTCJul 21, 20:05 UTC1h 5m
2026-07-21 ASL72L BEG → TIA Jul 21, 16:55 UTCJul 21, 18:10 UTC1h 15m
2026-07-21 ASL47P SOF → BEG Jul 21, 13:15 UTCJul 21, 14:10 UTC55m
2026-07-21 ASL26X BEG → SOF Jul 21, 11:25 UTCJul 21, 12:20 UTC55m
2026-07-20 ASL77J FLR → BEG Jul 20, 19:15 UTCJul 20, 20:50 UTC1h 35m
2026-07-20 ASL48D LIS → BEG Jul 20, 16:25 UTCJul 20, 18:35 UTC2h 10m
2026-07-20 ASL61J BEG → TIV Jul 20, 12:55 UTCJul 20, 13:55 UTC1h 0m
2026-07-20 ASL77B BEG → VIE Jul 20, 10:50 UTCJul 20, 12:00 UTC1h 10m
2026-07-20 ASL44Q VIE → BEG Jul 20, 07:40 UTCJul 20, 08:50 UTC1h 10m
2026-07-20 ASL80A BEG → VIE Jul 20, 05:35 UTCJul 20, 06:45 UTC1h 10m
2026-07-19 ASL68B - Jul 19, 19:30 UTCJul 19, 21:15 UTC1h 45m
2026-07-19 ASL79N BEG → VCE Jul 19, 16:25 UTCJul 19, 18:10 UTC1h 45m
2026-07-19 ASL61J BEG → TIV Jul 19, 13:30 UTCJul 19, 14:45 UTC1h 15m
2026-07-19 ASL77B BEG → VIE Jul 19, 10:45 UTCJul 19, 12:10 UTC1h 25m
2026-07-19 ASL74F OTP → BEG Jul 19, 01:35 UTCJul 19, 02:40 UTC1h 5m
2026-07-18 ASL38Z BEG → OTP Jul 18, 22:50 UTCJul 18, 23:50 UTC1h 0m
2026-07-18 ASL34Q BEG → BER Jul 18, 13:40 UTCJul 18, 15:00 UTC1h 20m
2026-07-18 ASL73P VCE → BEG Jul 18, 11:45 UTCJul 18, 13:00 UTC1h 15m
2026-07-18 ASL44Q VIE → BEG Jul 18, 07:50 UTCJul 18, 09:00 UTC1h 10m
2026-07-18 ASL80A BEG → VIE Jul 18, 05:30 UTCJul 18, 06:45 UTC1h 15m
2026-07-18 ASL74F OTP → BEG Jul 18, 01:34 UTCJul 18, 02:40 UTC1h 5m
2026-07-17 ASL38Z BEG → OTP Jul 17, 22:55 UTCJul 17, 23:55 UTC1h 0m
2026-07-17 ASL37Z VIE → BEG Jul 17, 19:00 UTCJul 17, 20:00 UTC1h 0m
2026-07-17 ASL45T BEG → VIE Jul 17, 16:44 UTCJul 17, 17:55 UTC1h 10m
2026-07-17 ASL34Q BEG → BER Jul 17, 13:55 UTCJul 17, 14:55 UTC1h 0m
2026-07-17 ASL73P VCE → BEG Jul 17, 11:10 UTCJul 17, 12:25 UTC1h 15m

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?
Yes. Mode-S 4C0242 is currently airborne.
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, ASL44Q, ASL80A, ASL77B.