Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 10h ago
Flights observed
474
Distinct callsigns
20
Country
RS
Last broadcast
10h 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 - 18 2026-07-05
ASL97E Spurling Aviation 17 2026-07-05
ASL44Q - 13 2026-07-13
ASL80A - 12 2026-07-13
ASL45B - 11 2026-07-14
ASL92Z - 10 2026-07-14
ASL47G - 10 2026-06-25
ASL45T Spurling Aviation 10 2026-07-09
ASL37Z - 10 2026-07-09
ASL33J - 10 2026-06-26
ASL79Y - 9 2026-07-08
ASL77B - 9 2026-07-14
ASL61J Spurling Aviation 9 2026-07-14
ASL33K Spurling Aviation 9 2026-07-08
ASL96B - 8 2026-07-13
ASL73P Spurling Aviation 8 2026-07-04
ASL59D - 8 2026-07-13
ASL47P Spurling Aviation 8 2026-07-09
ASL34Q Spurling Aviation 8 2026-07-04
ASL26X Spurling Aviation 8 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASL61J BEG → TIV Jul 14, 12:50 UTCJul 14, 13:55 UTC1h 5m
2026-07-14 ASL77B BEG → VIE Jul 14, 10:45 UTCJul 14, 12:10 UTC1h 25m
2026-07-14 ASL45B - Jul 14, 08:00 UTCJul 14, 08:50 UTC50m
2026-07-14 ASL92Z - Jul 14, 05:55 UTCJul 14, 06:45 UTC50m
2026-07-13 ASL61J BEG → TIV Jul 13, 12:50 UTCJul 13, 14:00 UTC1h 10m
2026-07-13 ASL77B BEG → VIE Jul 13, 10:45 UTCJul 13, 12:00 UTC1h 15m
2026-07-13 ASL44Q VIE → BEG Jul 13, 07:40 UTCJul 13, 08:50 UTC1h 10m
2026-07-13 ASL80A BEG → VIE Jul 13, 05:31 UTCJul 13, 06:40 UTC1h 10m
2026-07-13 ASL96B - Jul 13, 02:50 UTCJul 13, 03:25 UTC35m
2026-07-13 ASL59D - Jul 13, 00:10 UTCJul 13, 00:45 UTC35m
2026-07-12 ASL18W - Jul 12, 20:30 UTCJul 12, 21:20 UTC50m
2026-07-12 ASL31J BEG → ZAG Jul 12, 18:45 UTCJul 12, 19:35 UTC50m
2026-07-12 ASL59E BUD → BEG Jul 12, 17:10 UTCJul 12, 17:55 UTC45m
2026-07-12 ASL57U BEG → BUD Jul 12, 15:35 UTCJul 12, 16:25 UTC50m
2026-07-12 ASL19N - Jul 12, 12:55 UTCJul 12, 13:30 UTC35m
2026-07-12 ASL82Z - Jul 12, 11:01 UTCJul 12, 11:20 UTC20m
2026-07-12 ASL28F - Jul 12, 09:40 UTCJul 12, 10:05 UTC25m
2026-07-12 ASL23K - Jul 12, 07:15 UTCJul 12, 07:45 UTC30m
2026-07-11 ASL62A - Jul 11, 13:40 UTCJul 11, 14:35 UTC55m
2026-07-11 ASL84P BEG → RJK Jul 11, 11:30 UTCJul 11, 12:45 UTC1h 15m
2026-07-11 ASL44Q VIE → BEG Jul 11, 07:40 UTCJul 11, 08:50 UTC1h 10m
2026-07-11 ASL80A - Jul 11, 05:31 UTCJul 11, 06:50 UTC1h 20m
2026-07-11 ASL40B - Jul 11, 01:50 UTCJul 11, 02:50 UTC1h 0m
2026-07-10 ASL96P - Jul 10, 23:50 UTCJul 11, 00:40 UTC50m
2026-07-10 ASL18W - Jul 10, 20:25 UTCJul 10, 21:10 UTC45m
2026-07-10 ASL31J BEG → ZAG Jul 10, 18:40 UTCJul 10, 19:40 UTC1h 0m
2026-07-10 ASL59E BUD → BEG Jul 10, 17:00 UTCJul 10, 17:50 UTC50m
2026-07-10 ASL57U BEG → BUD Jul 10, 15:25 UTCJul 10, 16:20 UTC55m
2026-07-10 ASL61J BEG → TIV Jul 10, 12:55 UTCJul 10, 14:00 UTC1h 5m
2026-07-10 ASL77B BEG → VIE Jul 10, 10:50 UTCJul 10, 12:05 UTC1h 15m
2026-07-10 ASL31Q - Jul 10, 07:30 UTCJul 10, 08:30 UTC1h 0m
2026-07-10 ASL77L BEG → LJU Jul 10, 05:25 UTCJul 10, 06:35 UTC1h 10m
2026-07-09 ASL37Z VIE → BEG Jul 9, 19:10 UTCJul 9, 20:15 UTC1h 5m
2026-07-09 ASL45T BEG → VIE Jul 9, 16:50 UTCJul 9, 18:00 UTC1h 10m
2026-07-09 ASL47P SOF → BEG Jul 9, 13:25 UTCJul 9, 14:20 UTC55m
2026-07-09 ASL26X BEG → SOF Jul 9, 11:40 UTCJul 9, 12:25 UTC45m
2026-07-09 ASL87F - Jul 9, 08:00 UTCJul 9, 09:45 UTC1h 45m
2026-07-09 ASL89C BEG → BLQ Jul 9, 05:20 UTCJul 9, 07:05 UTC1h 45m
2026-07-09 ASL52D - Jul 9, 01:10 UTCJul 9, 02:40 UTC1h 30m
2026-07-08 ASL70Z - Jul 8, 22:55 UTCJul 9, 00:10 UTC1h 15m
2026-07-08 ASL343 MUC → BEG Jul 8, 19:25 UTCJul 8, 21:05 UTC1h 40m
2026-07-08 ASL342 BEG → MUC Jul 8, 16:25 UTCJul 8, 18:30 UTC2h 5m
2026-07-08 ASL33K SKP → BEG Jul 8, 14:10 UTCJul 8, 14:45 UTC35m
2026-07-08 ASL79Y - Jul 8, 11:50 UTCJul 8, 12:20 UTC30m
2026-07-08 ASL51E BEG → ZRH Jul 8, 10:05 UTCJul 8, 10:45 UTC40m
2026-07-08 ASL40T - Jul 8, 07:35 UTCJul 8, 09:10 UTC1h 35m
2026-07-08 ASL14D - Jul 8, 05:10 UTCJul 8, 06:35 UTC1h 25m
2026-07-07 ASL93T - Jul 7, 19:35 UTCJul 7, 20:45 UTC1h 10m
2026-07-07 ASL26T INI → LJU Jul 7, 17:10 UTCJul 7, 18:45 UTC1h 35m
2026-07-07 ASL99C BEG → TBS Jul 7, 15:10 UTCJul 7, 15:45 UTC35m

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 10h 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, ASL44Q, ASL80A, ASL45B.