Apparatus

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sensors Mode-S transponder

4C01E5

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-APF · AIRBUS A-319

Hex
4C01E5
Octal
23000745
Decimal
4,981,221
Country
RS
Tail
YU-APF
Type
A319
Broadcasting now · callsign ASL41E · 34,975 ft
Flights observed
507
Distinct callsigns
20
Country
RS
Last broadcast
2h ago

Current position

4C01E5 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4C01E5 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 - 15 2026-07-13
ASL10A Spurling Aviation 13 2026-07-13
ASL18F - 12 2026-07-14
ASL78N - 11 2026-07-14
ASL56D - 11 2026-07-14
ASL41E Spurling Aviation 11 2026-07-11
ASL1425 Spurling Aviation 11 2026-07-14
ASL1424 Spurling Aviation 11 2026-07-14
ASL96D Spurling Aviation 10 2026-06-17
ASL95E - 10 2026-07-12
ASL91K - 10 2026-07-12
ASL37J - 10 2026-07-13
ASL84H - 9 2026-07-09
ASL81K - 9 2026-07-09
ASL64R Spurling Aviation 9 2026-06-17
ASL84J - 7 2026-06-30
ASL82Y - 7 2026-07-09
ASL73J - 7 2026-07-10
ASL68F - 7 2026-06-29
ASL65W - 7 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASL56D - Jul 14, 17:35 UTCJul 14, 19:40 UTC2h 5m
2026-07-14 ASL1425 IST → INI Jul 14, 15:40 UTCJul 14, 16:25 UTC45m
2026-07-14 ASL1424 INI → IST Jul 14, 13:35 UTCJul 14, 14:30 UTC55m
2026-07-14 ASL18F - Jul 14, 10:40 UTCJul 14, 12:15 UTC1h 35m
2026-07-14 ASL78N - Jul 14, 05:35 UTCJul 14, 07:30 UTC1h 55m
2026-07-13 ASL37J - Jul 13, 23:05 UTCJul 13, 23:20 UTC15m
2026-07-13 ASL75J - Jul 13, 18:05 UTCJul 13, 18:35 UTC30m
2026-07-13 ASL64X - Jul 13, 16:40 UTCJul 13, 17:00 UTC20m
2026-07-13 ASL10A BEG → ZRH Jul 13, 13:00 UTCJul 13, 15:15 UTC2h 15m
2026-07-13 ASL12H BEG → LHR Jul 13, 08:35 UTCJul 13, 11:10 UTC2h 35m
2026-07-12 ASL57T VLC → BEG Jul 12, 19:30 UTCJul 12, 21:50 UTC2h 20m
2026-07-12 ASL67A ZAG → BEG Jul 12, 15:45 UTCJul 12, 18:20 UTC2h 35m
2026-07-12 ASL91K TBS → BEG Jul 12, 10:40 UTCJul 12, 13:45 UTC3h 5m
2026-07-12 ASL95E BEG → TBS Jul 12, 06:40 UTCJul 12, 09:20 UTC2h 40m
2026-07-12 ASL53B - Jul 12, 03:15 UTCJul 12, 03:35 UTC20m
2026-07-11 ASL18F - Jul 11, 21:25 UTCJul 11, 23:00 UTC1h 35m
2026-07-11 ASL78N - Jul 11, 18:10 UTCJul 11, 20:05 UTC1h 55m
2026-07-11 ASL1425 IST → INI Jul 11, 16:20 UTCJul 11, 17:00 UTC40m
2026-07-11 ASL1424 INI → IST Jul 11, 13:40 UTCJul 11, 14:35 UTC55m
2026-07-11 ASL41E CGN → INI Jul 11, 10:55 UTCJul 11, 12:30 UTC1h 35m
2026-07-11 ASL56D - Jul 11, 07:35 UTCJul 11, 09:40 UTC2h 5m
2026-07-11 ASL72M - Jul 11, 06:01 UTCJul 11, 06:25 UTC25m
2026-07-11 ASL44F - Jul 11, 04:30 UTCJul 11, 04:45 UTC15m
2026-07-10 ASL37J - Jul 10, 23:55 UTCJul 11, 00:10 UTC15m
2026-07-10 ASL11B BCN → BEG Jul 10, 19:25 UTCJul 10, 21:30 UTC2h 5m
2026-07-10 ASL73J BEG → BCN Jul 10, 15:40 UTCJul 10, 18:00 UTC2h 20m
2026-07-10 ASL86U - Jul 10, 13:40 UTCJul 10, 14:10 UTC30m
2026-07-10 ASL87A - Jul 10, 11:50 UTCJul 10, 12:15 UTC25m
2026-07-10 ASL51N BCN → BEG Jul 10, 08:25 UTCJul 10, 10:30 UTC2h 5m
2026-07-10 ASL63H BEG → BCN Jul 10, 04:40 UTCJul 10, 06:55 UTC2h 15m
2026-07-09 ASL65W ARN → BEG Jul 9, 19:45 UTCJul 9, 21:40 UTC1h 55m
2026-07-09 ASL82Y BEG → ARN Jul 9, 15:50 UTCJul 9, 18:25 UTC2h 35m
2026-07-09 ASL48X - Jul 9, 11:55 UTCJul 9, 14:25 UTC2h 30m
2026-07-09 ASL38M - Jul 9, 08:40 UTCJul 9, 10:45 UTC2h 5m
2026-07-09 ASL81K - Jul 9, 06:55 UTCJul 9, 07:25 UTC30m
2026-07-09 ASL84H - Jul 9, 05:15 UTCJul 9, 05:35 UTC20m
2026-07-08 ASL88B STR → BEG Jul 8, 19:05 UTCJul 8, 20:20 UTC1h 15m
2026-07-08 ASL99K BEG → STR Jul 8, 16:35 UTCJul 8, 18:05 UTC1h 30m
2026-07-08 ASL71A MAD → BEG Jul 8, 10:50 UTCJul 8, 13:35 UTC2h 45m
2026-07-08 ASL27E BEG → MAD Jul 8, 06:20 UTCJul 8, 09:05 UTC2h 45m
2026-07-08 ASL9871 - Jul 8, 02:55 UTCJul 8, 04:45 UTC1h 50m
2026-07-08 ASL9870 - Jul 8, 00:10 UTCJul 8, 01:40 UTC1h 30m
2026-07-07 ASL45X CDG → BEG Jul 7, 19:15 UTCJul 7, 21:15 UTC2h 0m
2026-07-07 ASL49U BEG → CDG Jul 7, 15:25 UTCJul 7, 17:40 UTC2h 15m
2026-07-07 ASL71A MAD → BEG Jul 7, 10:50 UTCJul 7, 13:30 UTC2h 40m
2026-07-07 ASL27E BEG → MAD Jul 7, 06:20 UTCJul 7, 09:00 UTC2h 40m
2026-07-06 ASL47E - Jul 6, 15:55 UTCJul 6, 18:10 UTC2h 15m
2026-07-06 ASL71H - Jul 6, 12:40 UTCJul 6, 14:45 UTC2h 5m
2026-07-06 ASL99L - Jul 6, 10:30 UTCJul 6, 11:05 UTC35m
2026-07-06 ASL52N BEG → TIV Jul 6, 08:25 UTCJul 6, 08:45 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-APF page for operator, model, and routing details .

Mode-S 4C01E5 frequently asked

What is Mode-S code 4C01E5?
4C01E5 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-APF.
Where is Mode-S 4C01E5 registered?
Mode-S code 4C01E5 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C01E5 broadcasting right now?
Yes. Mode-S 4C01E5 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C01E5, octal 23000745, decimal 4,981,221.
What flights does 4C01E5 operate?
Mode-S 4C01E5 has broadcast 20 distinct callsigns, including ASL12H, ASL10A, ASL18F, ASL78N, ASL56D.