Apparatus

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sensors Mode-S transponder

4C01F2

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-APS · AIRBUS A-320

Hex
4C01F2
Octal
23000762
Decimal
4,981,234
Country
RS
Tail
YU-APS
Type
A320
Broadcasting now · callsign ASL86T · 25,275 ft
Flights observed
112
Distinct callsigns
20
Country
RS
Last broadcast
7h ago

Current position

4C01F2 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4C01F2 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
ASL134 Spurling Aviation 8 2026-05-27
ASL49U - 7 2026-05-29
ASL45X Spurling Aviation 6 2026-05-29
ASL86T Spurling Aviation 4 2026-05-25
ASL71G Spurling Aviation 4 2026-05-25
ASL136 Spurling Aviation 4 2026-05-14
ASL135 Spurling Aviation 4 2026-05-13
ASL81E Spurling Aviation 3 2026-05-10
ASL54D Spurling Aviation 3 2026-05-10
ASL53X - 3 2026-04-14
ASL48X Spurling Aviation 3 2026-05-10
ASL42A Spurling Aviation 3 2026-05-23
ASL38M Spurling Aviation 3 2026-05-10
ASL20K Spurling Aviation 3 2026-05-23
ASL15M Spurling Aviation 3 2026-05-25
ASL96D Spurling Aviation 2 2026-05-27
ASL90M - 2 2026-05-17
ASL83Z - 2 2026-05-17
ASL73B Spurling Aviation 2 2026-05-29
ASL69U Spurling Aviation 2 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 ASL45X CDG → BEG May 29, 19:40 UTCMay 29, 21:35 UTC1h 55m
2026-05-29 ASL49U BEG → CDG May 29, 16:00 UTCMay 29, 18:15 UTC2h 15m
2026-05-29 ASL73B TGD → BEG May 29, 13:55 UTCMay 29, 14:30 UTC35m
2026-05-29 ASL32A BEG → TIV May 29, 12:05 UTCMay 29, 12:25 UTC20m
2026-05-29 ASL130 BEG → SVO May 29, 03:50 UTCMay 29, 10:40 UTC6h 50m
2026-05-28 ASL86U HAJ → BEG May 28, 13:50 UTCMay 28, 14:30 UTC40m
2026-05-28 ASL87A VIE → BEG May 28, 11:55 UTCMay 28, 12:20 UTC25m
2026-05-28 ASL37H VLC → BEG May 28, 08:00 UTCMay 28, 10:30 UTC2h 30m
2026-05-28 ASL69U BEG → VLC May 28, 04:15 UTCMay 28, 06:45 UTC2h 30m
2026-05-27 ASL134 BEG → SVO May 27, 16:55 UTCMay 27, 18:55 UTC2h 0m
2026-05-27 ASL96D ATH → BEG May 27, 13:20 UTCMay 27, 14:35 UTC1h 15m
2026-05-27 ASL64R BEG → ATH May 27, 10:30 UTCMay 27, 11:45 UTC1h 15m
2026-05-25 ASL15M BEG → MAD May 25, 17:00 UTCMay 25, 19:59 UTC3h 0m
2026-05-25 ASL53L BEG → MAD May 25, 12:35 UTCMay 25, 15:20 UTC2h 45m
2026-05-25 ASL71G CDG → BEG May 25, 08:30 UTCMay 25, 10:25 UTC1h 55m
2026-05-25 ASL86T BEG → CDG May 25, 05:05 UTCMay 25, 07:10 UTC2h 5m
2026-05-24 ASL11B PUY → BEG May 24, 19:35 UTCMay 24, 21:45 UTC2h 10m
2026-05-24 ASL73J BEG → HAM May 24, 16:15 UTCMay 24, 18:20 UTC2h 5m
2026-05-24 ASL423 IST → BEG May 24, 13:50 UTCMay 24, 14:55 UTC1h 5m
2026-05-24 ASL422 BEG → IST May 24, 10:30 UTCMay 24, 11:40 UTC1h 10m
2026-05-23 ASL53E PMI → BEG May 23, 12:45 UTCMay 23, 14:10 UTC1h 25m
2026-05-23 ASL27D BEG → ZRH May 23, 10:10 UTCMay 23, 11:35 UTC1h 25m
2026-05-23 ASL20K AMS → BEG May 23, 07:50 UTCMay 23, 09:05 UTC1h 15m
2026-05-23 ASL42A BEG → FCO May 23, 05:15 UTCMay 23, 06:15 UTC1h 0m
2026-05-22 ASL134 BEG → SVO May 22, 17:40 UTCMay 23, 01:20 UTC7h 40m
2026-05-22 ASL4041 IST → BEG May 22, 01:20 UTCMay 22, 01:55 UTC35m
2026-05-18 ASL4040 BEG → SOF May 18, 05:30 UTCMay 18, 05:50 UTC20m
2026-05-17 ASL98C ZRH → BEG May 17, 19:15 UTCMay 17, 20:45 UTC1h 30m
2026-05-17 ASL90F BEG → ZRH May 17, 16:35 UTCMay 17, 18:10 UTC1h 35m
2026-05-17 ASL83Z - May 17, 11:30 UTCMay 17, 14:30 UTC3h 0m
2026-05-17 ASL90M - May 17, 06:20 UTCMay 17, 09:40 UTC3h 20m
2026-05-15 ASL45X CDG → BEG May 15, 19:10 UTCMay 15, 21:00 UTC1h 50m
2026-05-15 ASL49U BEG → CDG May 15, 15:35 UTCMay 15, 17:45 UTC2h 10m
2026-05-14 ASL136 BEG → SVO May 14, 20:40 UTCMay 15, 03:10 UTC6h 30m
2026-05-13 ASL135 SVO → BEG May 13, 21:40 UTCMay 13, 22:10 UTC30m
2026-05-13 ASL134 BEG → SVO May 13, 17:10 UTCMay 13, 19:10 UTC2h 0m
2026-05-12 ASL135 SVO → BEG May 12, 21:50 UTCMay 12, 22:10 UTC20m
2026-05-12 ASL134 BEG → SVO May 12, 17:55 UTCMay 12, 20:01 UTC2h 5m
2026-05-11 ASL134 BEG → SVO May 11, 17:55 UTCMay 11, 20:00 UTC2h 5m
2026-05-10 ASL54D BEG → PVK May 10, 19:24 UTCMay 10, 20:45 UTC1h 20m
2026-05-10 ASL81E BEG → FCO May 10, 16:25 UTCMay 10, 17:34 UTC1h 10m
2026-05-10 ASL48X LCA → BEG May 10, 12:34 UTCMay 10, 14:59 UTC2h 25m
2026-05-10 ASL38M TGD → BEG May 10, 08:30 UTCMay 10, 10:35 UTC2h 5m
2026-05-09 ASL134 BEG → SVO May 9, 16:55 UTCMay 9, 18:40 UTC1h 45m
2026-05-09 ASL71G CDG → BEG May 9, 08:40 UTCMay 9, 10:35 UTC1h 55m
2026-05-09 ASL86T BEG → CDG May 9, 05:05 UTCMay 9, 07:15 UTC2h 10m
2026-05-08 ASL45X CDG → BEG May 8, 19:55 UTCMay 8, 21:55 UTC2h 0m
2026-05-08 ASL49U BEG → CDG May 8, 15:50 UTCMay 8, 18:05 UTC2h 15m
2026-05-07 ASL132 BEG → SVO May 7, 12:55 UTCMay 7, 14:50 UTC1h 55m
2026-05-07 ASL51N BEG → BEG May 7, 09:05 UTCMay 7, 11:00 UTC1h 55m

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

Mode-S 4C01F2 frequently asked

What is Mode-S code 4C01F2?
4C01F2 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-APS.
Where is Mode-S 4C01F2 registered?
Mode-S code 4C01F2 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C01F2 broadcasting right now?
Yes. Mode-S 4C01F2 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C01F2, octal 23000762, decimal 4,981,234.
What flights does 4C01F2 operate?
Mode-S 4C01F2 has broadcast 20 distinct callsigns, including ASL134, ASL49U, ASL45X, ASL86T, ASL71G.