Apparatus

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sensors Mode-S transponder

4C0241

ICAO 24-bit transponder address · allocated to Serbia

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

Hex
4C0241
Octal
23001101
Decimal
4,981,313
Country
RS
Tail
YU-ASB
Type
AT76
Broadcasting now · callsign ASL96B · 17,975 ft
Flights observed
479
Distinct callsigns
20
Country
RS
Last broadcast
3h ago

Current position

4C0241 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4C0241 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
ASL79Y - 14 2026-07-10
ASL72L Spurling Aviation 12 2026-07-12
ASL47P Spurling Aviation 12 2026-07-03
ASL26X Spurling Aviation 12 2026-07-03
ASL10N Spurling Aviation 12 2026-07-12
ASL92Z - 11 2026-07-10
ASL33K Spurling Aviation 11 2026-07-10
ASL81C Spurling Aviation 10 2026-06-30
ASL77L - 10 2026-06-29
ASL45T Spurling Aviation 10 2026-07-10
ASL45B - 10 2026-07-10
ASL37Z - 10 2026-07-10
ASL31Q - 10 2026-06-29
ASL49H Spurling Aviation 9 2026-06-30
ASL38Y - 9 2026-07-13
ASL32P Spurling Aviation 9 2026-07-13
ASL30L - 9 2026-06-23
ASL89R Spurling Aviation 8 2026-07-09
ASL47F - 8 2026-07-09
ASL24M Spurling Aviation 8 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ASL59D - Jul 13, 23:00 UTCJul 13, 23:30 UTC30m
2026-07-13 ASL77J - Jul 13, 18:50 UTCJul 13, 20:35 UTC1h 45m
2026-07-13 ASL48D LIS → BEG Jul 13, 16:05 UTCJul 13, 18:00 UTC1h 55m
2026-07-13 ASL32P BEG → LCA Jul 13, 14:15 UTCJul 13, 14:55 UTC40m
2026-07-13 ASL38Y - Jul 13, 11:45 UTCJul 13, 12:20 UTC35m
2026-07-13 ASL77W - Jul 13, 07:25 UTCJul 13, 09:00 UTC1h 35m
2026-07-13 ASL36Q BEG → VCE Jul 13, 04:45 UTCJul 13, 06:25 UTC1h 40m
2026-07-12 ASL10N LJU → BEG Jul 12, 19:35 UTCJul 12, 20:35 UTC1h 0m
2026-07-12 ASL72L BEG → TIA Jul 12, 17:50 UTCJul 12, 19:01 UTC1h 10m
2026-07-12 ASL45A - Jul 12, 16:30 UTCJul 12, 17:05 UTC35m
2026-07-12 ASL34Z - Jul 12, 14:15 UTCJul 12, 14:50 UTC35m
2026-07-12 ASL14U - Jul 12, 11:40 UTCJul 12, 12:15 UTC35m
2026-07-12 ASL17Y - Jul 12, 09:35 UTCJul 12, 10:10 UTC35m
2026-07-11 ASL97E BUD → BEG Jul 11, 13:30 UTCJul 11, 14:15 UTC45m
2026-07-11 ASL72Q BEG → BUD Jul 11, 11:45 UTCJul 11, 12:35 UTC50m
2026-07-11 ASL40Y - Jul 11, 09:10 UTCJul 11, 10:25 UTC1h 15m
2026-07-11 ASL74K - Jul 11, 06:40 UTCJul 11, 08:05 UTC1h 25m
2026-07-11 ASL12E SKG → BEG Jul 11, 02:00 UTCJul 11, 03:20 UTC1h 20m
2026-07-10 ASL24B BEG → SKG Jul 10, 23:50 UTCJul 11, 01:05 UTC1h 15m
2026-07-10 ASL37Z - Jul 10, 18:55 UTCJul 10, 19:55 UTC1h 0m
2026-07-10 ASL45T BEG → VIE Jul 10, 16:45 UTCJul 10, 18:00 UTC1h 15m
2026-07-10 ASL33K SKP → BEG Jul 10, 13:50 UTCJul 10, 14:30 UTC40m
2026-07-10 ASL79Y - Jul 10, 11:50 UTCJul 10, 12:25 UTC35m
2026-07-10 ASL12C BNX → BEG Jul 10, 10:05 UTCJul 10, 10:35 UTC30m
2026-07-10 ASL62B - Jul 10, 08:25 UTCJul 10, 08:55 UTC30m
2026-07-10 ASL45B - Jul 10, 06:45 UTCJul 10, 07:40 UTC55m
2026-07-10 ASL92Z - Jul 10, 05:10 UTCJul 10, 06:00 UTC50m
2026-07-10 ASL40B - Jul 10, 01:40 UTCJul 10, 02:45 UTC1h 5m
2026-07-09 ASL96P - Jul 9, 23:10 UTCJul 10, 00:00 UTC50m
2026-07-09 ASL47F PRG → BEG Jul 9, 18:45 UTCJul 9, 20:20 UTC1h 35m
2026-07-09 ASL89R BEG → PRG Jul 9, 16:05 UTCJul 9, 18:00 UTC1h 55m
2026-07-09 ASL87Q SKP → BEG Jul 9, 14:00 UTCJul 9, 14:40 UTC40m
2026-07-09 ASL56C FCO → BEG Jul 9, 11:45 UTCJul 9, 12:30 UTC45m
2026-07-09 ASL78U PRG → BEG Jul 9, 07:20 UTCJul 9, 09:00 UTC1h 40m
2026-07-09 ASL18R BEG → PRG Jul 9, 04:30 UTCJul 9, 06:25 UTC1h 55m
2026-07-09 ASL12E SKG → BEG Jul 9, 01:35 UTCJul 9, 02:55 UTC1h 20m
2026-07-08 ASL24B BEG → SKG Jul 8, 23:05 UTCJul 9, 00:25 UTC1h 20m
2026-07-08 ASL75J - Jul 8, 17:40 UTCJul 8, 18:15 UTC35m
2026-07-08 ASL64X - Jul 8, 15:40 UTCJul 8, 16:15 UTC35m
2026-07-08 ASL62A - Jul 8, 13:15 UTCJul 8, 14:15 UTC1h 0m
2026-07-08 ASL84P BEG → RJK Jul 8, 11:00 UTCJul 8, 12:10 UTC1h 10m
2026-07-07 ASL97E BUD → BEG Jul 7, 13:25 UTCJul 7, 14:20 UTC55m
2026-07-07 ASL72Q BEG → BUD Jul 7, 11:40 UTCJul 7, 12:35 UTC55m
2026-07-07 ASL45B - Jul 7, 07:55 UTCJul 7, 08:45 UTC50m
2026-07-07 ASL92Z - Jul 7, 06:00 UTCJul 7, 06:50 UTC50m
2026-07-06 ASL80M BRI → BEG Jul 6, 18:40 UTCJul 6, 20:00 UTC1h 20m
2026-07-06 ASL24C BEG → BRI Jul 6, 16:25 UTCJul 6, 17:40 UTC1h 15m
2026-07-06 ASL40Y - Jul 6, 13:50 UTCJul 6, 15:05 UTC1h 15m
2026-07-06 ASL74K - Jul 6, 11:35 UTCJul 6, 12:45 UTC1h 10m
2026-07-06 ASL157 KRK → BEG Jul 6, 07:30 UTCJul 6, 08:55 UTC1h 25m

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

Mode-S 4C0241 frequently asked

What is Mode-S code 4C0241?
4C0241 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-ASB.
Where is Mode-S 4C0241 registered?
Mode-S code 4C0241 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C0241 broadcasting right now?
Yes. Mode-S 4C0241 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C0241, octal 23001101, decimal 4,981,313.
What flights does 4C0241 operate?
Mode-S 4C0241 has broadcast 20 distinct callsigns, including ASL79Y, ASL72L, ASL47P, ASL26X, ASL10N.