Apparatus

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sensors Mode-S transponder

4C01E0

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-APA · AIRBUS A-319

Hex
4C01E0
Octal
23000740
Decimal
4,981,216
Country
RS
Tail
YU-APA
Type
A319
Broadcasting now · callsign ASL137 · 35,950 ft
Flights observed
451
Distinct callsigns
20
Country
RS
Last broadcast
2h ago

Current position

4C01E0 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4C01E0 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
ASL12H - 16 2026-07-11
ASL10A Spurling Aviation 16 2026-07-11
ASL93X - 11 2026-07-09
ASL37R - 11 2026-07-09
ASL136 - 9 2026-07-14
ASL84J - 8 2026-06-22
ASL58V Spurling Aviation 8 2026-06-09
ASL42A - 7 2026-07-14
ASL4010 - 7 2026-06-07
ASL20K - 7 2026-07-14
ASL16G Spurling Aviation 7 2026-06-09
ASL122 Spurling Aviation 7 2026-07-04
ASL87A - 6 2026-07-14
ASL86U - 6 2026-07-14
ASL86T - 6 2026-07-08
ASL84H - 6 2026-07-06
ASL81K - 6 2026-07-06
ASL71G - 6 2026-07-08
ASL68F - 6 2026-06-21
ASL57F - 6 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASL136 - Jul 14, 20:10 UTCJul 14, 22:10 UTC2h 0m
2026-07-14 ASL86U - Jul 14, 13:35 UTCJul 14, 14:10 UTC35m
2026-07-14 ASL87A - Jul 14, 11:40 UTCJul 14, 12:05 UTC25m
2026-07-14 ASL20K - Jul 14, 08:00 UTCJul 14, 09:10 UTC1h 10m
2026-07-14 ASL42A BEG → FCO Jul 14, 05:05 UTCJul 14, 06:15 UTC1h 10m
2026-07-13 ASL134 BEG → BEG Jul 13, 17:25 UTCJul 14, 00:25 UTC7h 0m
2026-07-13 ASL69A - Jul 13, 14:15 UTCJul 13, 15:40 UTC1h 25m
2026-07-13 ASL31D - Jul 13, 11:45 UTCJul 13, 12:55 UTC1h 10m
2026-07-13 ASL38K - Jul 13, 08:15 UTCJul 13, 10:05 UTC1h 50m
2026-07-13 ASL26G BEG → AMS Jul 13, 04:50 UTCJul 13, 07:01 UTC2h 10m
2026-07-12 ASL127 - Jul 12, 21:55 UTCJul 13, 00:05 UTC2h 10m
2026-07-12 ASL126 - Jul 12, 17:10 UTCJul 12, 19:40 UTC2h 30m
2026-07-12 ASL48X LCA → BEG Jul 12, 12:55 UTCJul 12, 15:05 UTC2h 10m
2026-07-12 ASL38M - Jul 12, 08:35 UTCJul 12, 10:45 UTC2h 10m
2026-07-11 ASL136 BEG → BEG Jul 11, 20:20 UTCJul 12, 02:55 UTC6h 35m
2026-07-11 ASL10A BEG → ZRH Jul 11, 14:25 UTCJul 11, 16:40 UTC2h 15m
2026-07-11 ASL12H BEG → LHR Jul 11, 10:10 UTCJul 11, 12:45 UTC2h 35m
2026-07-10 ASL43N MXP → BEG Jul 10, 19:50 UTCJul 10, 21:05 UTC1h 15m
2026-07-10 ASL14G BEG → LHR Jul 10, 16:55 UTCJul 10, 18:25 UTC1h 30m
2026-07-10 ASL10A BEG → ZRH Jul 10, 13:10 UTCJul 10, 15:20 UTC2h 10m
2026-07-10 ASL12H BEG → LHR Jul 10, 08:55 UTCJul 10, 11:40 UTC2h 45m
2026-07-10 ASL15A - Jul 10, 06:35 UTCJul 10, 07:00 UTC25m
2026-07-10 ASL57F - Jul 10, 05:00 UTCJul 10, 05:20 UTC20m
2026-07-09 ASL37R - Jul 9, 13:30 UTCJul 9, 14:00 UTC30m
2026-07-09 ASL93X - Jul 9, 12:05 UTCJul 9, 12:25 UTC20m
2026-07-09 ASL99L - Jul 9, 10:15 UTCJul 9, 10:45 UTC30m
2026-07-09 ASL52N BEG → TIV Jul 9, 08:25 UTCJul 9, 08:40 UTC15m
2026-07-09 ASL15A - Jul 9, 06:25 UTCJul 9, 06:50 UTC25m
2026-07-09 ASL57F - Jul 9, 04:45 UTCJul 9, 05:05 UTC20m
2026-07-08 ASL16J CPH → BEG Jul 8, 19:00 UTCJul 8, 20:35 UTC1h 35m
2026-07-08 ASL19H BEG → CPH Jul 8, 15:45 UTCJul 8, 17:55 UTC2h 10m
2026-07-08 ASL37R - Jul 8, 14:10 UTCJul 8, 14:40 UTC30m
2026-07-08 ASL93X - Jul 8, 11:55 UTCJul 8, 12:15 UTC20m
2026-07-08 ASL71G - Jul 8, 08:40 UTCJul 8, 10:40 UTC2h 0m
2026-07-08 ASL86T - Jul 8, 04:50 UTCJul 8, 07:05 UTC2h 15m
2026-07-07 ASL187 BEG → BEG Jul 7, 12:35 UTCJul 7, 20:10 UTC7h 35m
2026-07-07 ASL51N BCN → BEG Jul 7, 08:30 UTCJul 7, 10:40 UTC2h 10m
2026-07-07 ASL63H - Jul 7, 04:40 UTCJul 7, 07:00 UTC2h 20m
2026-07-07 ASL427 - Jul 7, 01:35 UTCJul 7, 02:45 UTC1h 10m
2026-07-06 ASL426 - Jul 6, 23:05 UTCJul 7, 00:15 UTC1h 10m
2026-07-06 ASL43N MXP → BEG Jul 6, 19:10 UTCJul 6, 20:25 UTC1h 15m
2026-07-06 ASL14G BEG → LHR Jul 6, 16:45 UTCJul 6, 18:10 UTC1h 25m
2026-07-06 ASL10A BEG → ZRH Jul 6, 13:15 UTCJul 6, 15:30 UTC2h 15m
2026-07-06 ASL12H BEG → LHR Jul 6, 09:05 UTCJul 6, 11:50 UTC2h 45m
2026-07-06 ASL81K - Jul 6, 06:40 UTCJul 6, 07:10 UTC30m
2026-07-06 ASL84H - Jul 6, 05:05 UTCJul 6, 05:25 UTC20m
2026-07-05 ASL45X CDG → BEG Jul 5, 19:50 UTCJul 5, 21:50 UTC2h 0m
2026-07-05 ASL49U BEG → CDG Jul 5, 16:05 UTCJul 5, 18:15 UTC2h 10m
2026-07-05 ASL37R - Jul 5, 14:20 UTCJul 5, 14:50 UTC30m
2026-07-05 ASL93X - Jul 5, 11:55 UTCJul 5, 12:15 UTC20m

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

Mode-S 4C01E0 frequently asked

What is Mode-S code 4C01E0?
4C01E0 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-APA.
Where is Mode-S 4C01E0 registered?
Mode-S code 4C01E0 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C01E0 broadcasting right now?
Yes. Mode-S 4C01E0 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C01E0, octal 23000740, decimal 4,981,216.
What flights does 4C01E0 operate?
Mode-S 4C01E0 has broadcast 20 distinct callsigns, including ASL12H, ASL10A, ASL93X, ASL37R, ASL136.