Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
No current signal · last broadcast Jul 26, 19:20 UTC
Flights observed
557
Distinct callsigns
20
Country
RS
Last broadcast
Jul 26, 19:20 UTC

Last known position

Most recent position reported by Mode-S 4C0241.

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 - 19 2026-07-25
ASL33K - 16 2026-07-25
ASL72L Spurling Aviation 13 2026-07-14
ASL10N Spurling Aviation 13 2026-07-14
ASL47P Spurling Aviation 12 2026-07-03
ASL26X Spurling Aviation 12 2026-07-03
ASL92Z - 11 2026-07-10
ASL45T Spurling Aviation 11 2026-07-16
ASL37Z - 11 2026-07-16
ASL81C Spurling Aviation 10 2026-06-30
ASL77L - 10 2026-06-29
ASL45B - 10 2026-07-10
ASL31Q - 10 2026-06-29
ASL89R Spurling Aviation 9 2026-07-24
ASL89C - 9 2026-07-20
ASL87F - 9 2026-07-20
ASL49H Spurling Aviation 9 2026-06-30
ASL47F - 9 2026-07-24
ASL38Y - 9 2026-07-13
ASL32P Spurling Aviation 9 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL40Y PUY → BEG Jul 26, 18:15 UTCJul 26, 19:20 UTC1h 5m
2026-07-26 ASL74K BEG → AMS Jul 26, 16:05 UTCJul 26, 17:25 UTC1h 20m
2026-07-26 ASL34Q BEG → BER Jul 26, 12:55 UTCJul 26, 14:10 UTC1h 15m
2026-07-26 ASL73P VCE → BEG Jul 26, 10:50 UTCJul 26, 12:05 UTC1h 15m
2026-07-26 ASL44Q VIE → BEG Jul 26, 07:45 UTCJul 26, 08:45 UTC1h 0m
2026-07-26 ASL80A BEG → CPH Jul 26, 05:35 UTCJul 26, 06:50 UTC1h 16m
2026-07-25 ASL33K - Jul 25, 14:15 UTCJul 25, 14:50 UTC35m
2026-07-25 ASL79Y - Jul 25, 12:05 UTCJul 25, 12:40 UTC35m
2026-07-25 ASL10Q BEG → CTA Jul 25, 09:50 UTCJul 25, 10:40 UTC50m
2026-07-25 ASL34H MAD → BEG Jul 25, 08:05 UTCJul 25, 08:55 UTC50m
2026-07-25 ASL33J INI → BEG Jul 25, 02:20 UTCJul 25, 02:55 UTC35m
2026-07-24 ASL47G BEG → SKP Jul 24, 23:20 UTCJul 24, 23:55 UTC35m
2026-07-24 ASL47F PRG → BEG Jul 24, 18:50 UTCJul 24, 20:25 UTC1h 35m
2026-07-24 ASL89R BEG → PRG Jul 24, 16:10 UTCJul 24, 18:00 UTC1h 50m
2026-07-24 ASL34Q BEG → BER Jul 24, 13:15 UTCJul 24, 14:25 UTC1h 10m
2026-07-24 ASL73P VCE → BEG Jul 24, 11:20 UTCJul 24, 12:30 UTC1h 10m
2026-07-24 ASL23K BEG → TIV Jul 24, 06:15 UTCJul 24, 07:45 UTC1h 30m
2026-07-24 ASL40B OHD → BEG Jul 24, 01:35 UTCJul 24, 02:40 UTC1h 5m
2026-07-23 ASL96P TIV → BEG Jul 23, 23:10 UTCJul 24, 00:05 UTC55m
2026-07-23 ASL27L DBV → BEG Jul 23, 13:40 UTCJul 23, 14:35 UTC55m
2026-07-23 ASL90A BEG → DBV Jul 23, 11:35 UTCJul 23, 12:45 UTC1h 10m
2026-07-23 ASL59L - Jul 23, 08:50 UTCJul 23, 10:05 UTC1h 15m
2026-07-23 ASL83D - Jul 23, 06:35 UTCJul 23, 07:50 UTC1h 15m
2026-07-22 ASL75J SOF → BEG Jul 22, 17:40 UTCJul 22, 18:15 UTC35m
2026-07-22 ASL64X PRG → BEG Jul 22, 15:40 UTCJul 22, 16:10 UTC30m
2026-07-22 ASL97E BUD → BEG Jul 22, 13:35 UTCJul 22, 14:30 UTC55m
2026-07-22 ASL72Q BEG → BUD Jul 22, 11:45 UTCJul 22, 12:35 UTC50m
2026-07-21 ASL61J BEG → TIV Jul 21, 13:00 UTCJul 21, 14:00 UTC1h 0m
2026-07-21 ASL77B BEG → VIE Jul 21, 10:45 UTCJul 21, 12:05 UTC1h 20m
2026-07-21 ASL15A - Jul 21, 07:00 UTCJul 21, 07:35 UTC35m
2026-07-21 ASL57F BEG → CDG Jul 21, 05:00 UTCJul 21, 05:35 UTC35m
2026-07-20 ASL70V SZG → BEG Jul 20, 19:05 UTCJul 20, 20:30 UTC1h 25m
2026-07-20 ASL21W BEG → SZG Jul 20, 16:40 UTCJul 20, 18:25 UTC1h 45m
2026-07-20 ASL40Y - Jul 20, 14:05 UTCJul 20, 15:25 UTC1h 20m
2026-07-20 ASL74K - Jul 20, 11:55 UTCJul 20, 13:10 UTC1h 15m
2026-07-20 ASL87F - Jul 20, 08:15 UTCJul 20, 09:55 UTC1h 40m
2026-07-20 ASL89C BEG → BLQ Jul 20, 04:45 UTCJul 20, 07:05 UTC2h 20m
2026-07-20 ASL96B - Jul 20, 02:30 UTCJul 20, 03:10 UTC40m
2026-07-19 ASL59D - Jul 19, 23:45 UTCJul 20, 00:25 UTC40m
2026-07-19 ASL48G GOT → BEG Jul 19, 19:00 UTCJul 19, 20:35 UTC1h 35m
2026-07-19 ASL95Q BEG → BLQ Jul 19, 16:05 UTCJul 19, 18:00 UTC1h 55m
2026-07-19 ASL33K - Jul 19, 13:50 UTCJul 19, 14:35 UTC45m
2026-07-19 ASL79Y - Jul 19, 11:30 UTCJul 19, 12:05 UTC35m
2026-07-19 ASL59L - Jul 19, 08:30 UTCJul 19, 09:45 UTC1h 15m
2026-07-19 ASL83D BEG → BRI Jul 19, 05:40 UTCJul 19, 07:05 UTC1h 25m
2026-07-18 ASL61J BEG → TIV Jul 18, 13:00 UTCJul 18, 14:10 UTC1h 10m
2026-07-18 ASL77B BEG → VIE Jul 18, 10:55 UTCJul 18, 12:05 UTC1h 10m
2026-07-18 ASL40Y - Jul 18, 08:25 UTCJul 18, 09:35 UTC1h 10m
2026-07-18 ASL74K - Jul 18, 05:55 UTCJul 18, 07:20 UTC1h 25m
2026-07-17 ASL68B - Jul 17, 18:55 UTCJul 17, 20:15 UTC1h 20m

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?
No active broadcast right now. Last signal was Jul 26, 19:20 UTC.
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, ASL33K, ASL72L, ASL10N, ASL47P.