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 ASL49G · 33,975 ft
Flights observed
262
Distinct callsigns
20
Country
RS
Last broadcast
8h 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 Spurling Aviation 9 2026-05-26
ASL96D Spurling Aviation 8 2026-05-29
ASL64R Spurling Aviation 8 2026-05-29
ASL41E Spurling Aviation 7 2026-05-23
ASL18F Spurling Aviation 7 2026-05-23
ASL10A Spurling Aviation 7 2026-05-26
ASL78N Spurling Aviation 6 2026-05-23
ASL73J Spurling Aviation 6 2026-05-11
ASL56D Spurling Aviation 6 2026-05-23
ASL1425 Spurling Aviation 6 2026-05-23
ASL1424 Spurling Aviation 6 2026-05-23
ASL37J Spurling Aviation 5 2026-05-22
ASL14G Spurling Aviation 5 2026-05-13
ASL11B Spurling Aviation 5 2026-05-11
ASL96K Spurling Aviation 4 2026-04-18
ASL93X Spurling Aviation 4 2026-05-22
ASL84J Spurling Aviation 4 2026-05-29
ASL82Y Spurling Aviation 4 2026-05-24
ASL68F Spurling Aviation 4 2026-05-28
ASL65W Spurling Aviation 4 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 ASL14A BCN → BEG May 29, 19:00 UTCMay 29, 20:15 UTC1h 15m
2026-05-29 ASL46F BEG → ATH May 29, 16:35 UTCMay 29, 17:45 UTC1h 10m
2026-05-29 ASL96D ATH → BEG May 29, 13:45 UTCMay 29, 15:05 UTC1h 20m
2026-05-29 ASL64R BEG → ATH May 29, 11:00 UTCMay 29, 12:15 UTC1h 15m
2026-05-29 ASL88G ZRH → BEG May 29, 07:55 UTCMay 29, 09:15 UTC1h 20m
2026-05-29 ASL82X BEG → ZRH May 29, 05:05 UTCMay 29, 06:35 UTC1h 30m
2026-05-29 ASL84J LCA → BEG May 29, 01:00 UTCMay 29, 03:20 UTC2h 20m
2026-05-28 ASL68F CGN → INI May 28, 21:50 UTCMay 28, 23:50 UTC2h 0m
2026-05-28 ASL64P BEG → CPH May 28, 19:00 UTCMay 28, 20:40 UTC1h 40m
2026-05-28 ASL78P BEG → CHQ May 28, 15:55 UTCMay 28, 17:50 UTC1h 55m
2026-05-28 ASL48X LCA → BEG May 28, 11:55 UTCMay 28, 14:20 UTC2h 25m
2026-05-28 ASL38M TGD → BEG May 28, 08:30 UTCMay 28, 10:40 UTC2h 10m
2026-05-28 ASL81K BEG → LHR May 28, 06:35 UTCMay 28, 07:15 UTC40m
2026-05-28 ASL84H BEG → TIV May 28, 05:00 UTCMay 28, 05:35 UTC35m
2026-05-27 ASL45X CDG → BEG May 27, 19:40 UTCMay 27, 21:35 UTC1h 55m
2026-05-27 ASL49U BEG → CDG May 27, 15:40 UTCMay 27, 18:05 UTC2h 25m
2026-05-27 ASL71A BEG → AMS May 27, 10:55 UTCMay 27, 13:40 UTC2h 45m
2026-05-27 ASL27E - May 27, 06:34 UTCMay 27, 09:15 UTC2h 40m
2026-05-26 ASL10A BEG → ZRH May 26, 13:10 UTCMay 26, 15:24 UTC2h 15m
2026-05-26 ASL12H BEG → LHR May 26, 08:39 UTCMay 26, 11:20 UTC2h 40m
2026-05-26 ASL91K TBS → BEG May 26, 00:35 UTCMay 26, 03:15 UTC2h 40m
2026-05-25 ASL95E BEG → TBS May 25, 11:45 UTCMay 25, 14:45 UTC3h 0m
2026-05-25 ASL38K AMS → BEG May 25, 08:30 UTCMay 25, 10:20 UTC1h 50m
2026-05-25 ASL26G BEG → AMS May 25, 04:45 UTCMay 25, 06:45 UTC2h 0m
2026-05-24 ASL427 IST → BEG May 24, 23:15 UTCMay 25, 02:50 UTC3h 35m
2026-05-24 ASL65W ARN → BEG May 24, 19:15 UTCMay 24, 21:25 UTC2h 10m
2026-05-24 ASL82Y BEG → ARN May 24, 15:35 UTCMay 24, 18:45 UTC3h 10m
2026-05-24 ASL48X LCA → BEG May 24, 12:00 UTCMay 24, 14:15 UTC2h 15m
2026-05-24 ASL38M TGD → BEG May 24, 08:25 UTCMay 24, 10:40 UTC2h 15m
2026-05-24 ASL53B LIS → BEG May 24, 03:05 UTCMay 24, 03:30 UTC25m
2026-05-23 ASL18F BEG → TIA May 23, 19:30 UTCMay 23, 21:05 UTC1h 35m
2026-05-23 ASL78N INI → HHN May 23, 16:20 UTCMay 23, 18:15 UTC1h 56m
2026-05-23 ASL1425 IST → INI May 23, 14:05 UTCMay 23, 14:45 UTC40m
2026-05-23 ASL1424 INI → IST May 23, 11:40 UTCMay 23, 12:35 UTC55m
2026-05-23 ASL41E CGN → INI May 23, 08:40 UTCMay 23, 10:25 UTC1h 45m
2026-05-23 ASL56D ZRH → BEG May 23, 05:20 UTCMay 23, 07:15 UTC1h 55m
2026-05-22 ASL37J BRU → BEG May 22, 23:05 UTCMay 22, 23:20 UTC15m
2026-05-22 ASL30L TGD → BEG May 22, 20:10 UTCMay 22, 20:35 UTC25m
2026-05-22 ASL24M BEG → TGD May 22, 18:50 UTCMay 22, 19:20 UTC30m
2026-05-22 ASL22Q TIV → BEG May 22, 17:05 UTCMay 22, 17:40 UTC35m
2026-05-22 ASL30D SKP → BEG May 22, 15:40 UTCMay 22, 16:00 UTC20m
2026-05-22 ASL37R TIV → BEG May 22, 13:35 UTCMay 22, 14:05 UTC30m
2026-05-22 ASL93X BEG → TGD May 22, 12:00 UTCMay 22, 12:25 UTC25m
2026-05-22 ASL71G CDG → BEG May 22, 08:40 UTCMay 22, 10:40 UTC2h 0m
2026-05-22 ASL86T BEG → CDG May 22, 05:00 UTCMay 22, 07:10 UTC2h 10m
2026-05-22 ASL91K TBS → BEG May 22, 00:25 UTCMay 22, 03:00 UTC2h 35m
2026-05-21 ASL95E BEG → TBS May 21, 11:40 UTCMay 21, 14:30 UTC2h 50m
2026-05-21 ASL19P BER → BEG May 21, 08:30 UTCMay 21, 10:00 UTC1h 30m
2026-05-21 ASL94D BEG → BER May 21, 04:55 UTCMay 21, 06:20 UTC1h 25m
2026-05-20 ASL16J - May 20, 18:40 UTCMay 20, 20:25 UTC1h 45m

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, ASL96D, ASL64R, ASL41E, ASL18F.