Apparatus

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sensors Mode-S transponder

4C01F3

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-APT · AIRBUS A-320

Hex
4C01F3
Octal
23000763
Decimal
4,981,235
Country
RS
Tail
YU-APT
Type
A320
Broadcasting now · callsign ASL130 · 6,350 ft
Flights observed
444
Distinct callsigns
20
Country
RS
Last broadcast
Jul 26, 22:00 UTC

Current position

4C01F3 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4C01F3 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 - 21 2026-07-18
ASL132 - 19 2026-07-21
ASL133 - 17 2026-07-21
ASL135 Spurling Aviation 13 2026-07-18
ASL73B Spurling Aviation 10 2026-07-26
ASL32A Spurling Aviation 10 2026-07-26
ASL63H - 9 2026-07-02
ASL51N - 9 2026-07-02
ASL130 - 9 2026-06-23
ASL87A - 7 2026-07-19
ASL86U - 7 2026-07-19
ASL73J - 7 2026-07-19
ASL11B - 7 2026-07-19
ASL9975 - 5 2026-07-17
ASL9974 - 5 2026-07-17
ASL71H Spurling Aviation 5 2026-06-15
ASL69A - 5 2026-07-24
ASL57Z - 5 2026-07-20
ASL53X - 5 2026-07-14
ASL49G - 5 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL65W ARN → BEG Jul 26, 19:30 UTCJul 26, 21:55 UTC2h 25m
2026-07-26 ASL82Y BEG → ARN Jul 26, 16:00 UTCJul 26, 18:10 UTC2h 10m
2026-07-26 ASL73B TGD → BEG Jul 26, 14:10 UTCJul 26, 14:30 UTC20m
2026-07-26 ASL32A BEG → TIV Jul 26, 11:55 UTCJul 26, 12:10 UTC15m
2026-07-26 ASL29A - Jul 26, 08:10 UTCJul 26, 10:10 UTC2h 0m
2026-07-26 ASL68E BEG → OHD Jul 26, 04:45 UTCJul 26, 06:20 UTC1h 35m
2026-07-25 ASL39G TBS → BEG Jul 25, 18:50 UTCJul 25, 20:40 UTC1h 50m
2026-07-25 ASL9206 - Jul 25, 16:10 UTCJul 25, 17:05 UTC55m
2026-07-25 ASL80L - Jul 25, 12:55 UTCJul 25, 14:45 UTC1h 50m
2026-07-25 ASL26E INI → HHN Jul 25, 07:25 UTCJul 25, 08:55 UTC1h 30m
2026-07-25 ASL47H - Jul 25, 04:10 UTCJul 25, 05:55 UTC1h 45m
2026-07-24 ASL75J SOF → BEG Jul 24, 18:15 UTCJul 24, 18:40 UTC25m
2026-07-24 ASL64X PRG → BEG Jul 24, 16:20 UTCJul 24, 16:40 UTC20m
2026-07-24 ASL69A - Jul 24, 13:10 UTCJul 24, 14:45 UTC1h 35m
2026-07-24 ASL31D - Jul 24, 10:15 UTCJul 24, 11:40 UTC1h 25m
2026-07-23 ASL136 BEG → BEG Jul 23, 20:10 UTCJul 24, 03:40 UTC7h 30m
2026-07-23 ASL12X - Jul 23, 14:05 UTCJul 23, 14:55 UTC50m
2026-07-23 ASL58D - Jul 23, 11:45 UTCJul 23, 12:20 UTC35m
2026-07-23 ASL11A NCE → BEG Jul 23, 08:35 UTCJul 23, 10:00 UTC1h 25m
2026-07-23 ASL91M BEG → NCE Jul 23, 05:30 UTCJul 23, 07:15 UTC1h 45m
2026-07-22 ASL136 - Jul 22, 20:10 UTCJul 22, 22:15 UTC2h 5m
2026-07-22 ASL93N RHO → BEG Jul 22, 13:00 UTCJul 22, 14:45 UTC1h 45m
2026-07-22 ASL36V - Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-22 ASL35P BUD → BEG Jul 22, 03:10 UTCJul 22, 05:15 UTC2h 5m
2026-07-21 ASL133 - Jul 21, 20:35 UTCJul 21, 21:20 UTC45m
2026-07-21 ASL133 SVO → SVO Jul 21, 18:50 UTCJul 21, 19:15 UTC25m
2026-07-21 ASL132 - Jul 21, 14:35 UTCJul 21, 16:25 UTC1h 50m
2026-07-21 ASL137 - Jul 21, 03:00 UTCJul 21, 03:55 UTC55m
2026-07-21 ASL137 - Jul 21, 01:20 UTCJul 21, 01:45 UTC25m
2026-07-20 ASL136 - Jul 20, 21:05 UTCJul 20, 22:55 UTC1h 50m
2026-07-20 ASL22Q TIV → BEG Jul 20, 18:20 UTCJul 20, 18:45 UTC25m
2026-07-20 ASL30D SKP → BEG Jul 20, 16:40 UTCJul 20, 17:00 UTC20m
2026-07-20 ASL73B TGD → BEG Jul 20, 14:20 UTCJul 20, 14:55 UTC35m
2026-07-20 ASL32A BEG → TIV Jul 20, 12:30 UTCJul 20, 12:55 UTC25m
2026-07-20 ASL57Z OSL → BEG Jul 20, 08:00 UTCJul 20, 10:25 UTC2h 25m
2026-07-20 ASL49G BEG → OSL Jul 20, 04:20 UTCJul 20, 06:45 UTC2h 25m
2026-07-20 ASL427 - Jul 20, 02:05 UTCJul 20, 02:45 UTC40m
2026-07-19 ASL426 - Jul 19, 23:15 UTCJul 20, 00:30 UTC1h 15m
2026-07-19 ASL11B BCN → BEG Jul 19, 19:25 UTCJul 19, 21:40 UTC2h 15m
2026-07-19 ASL73J BEG → BCN Jul 19, 15:40 UTCJul 19, 18:05 UTC2h 25m
2026-07-19 ASL86U - Jul 19, 13:45 UTCJul 19, 14:20 UTC35m
2026-07-19 ASL87A - Jul 19, 11:50 UTCJul 19, 12:30 UTC40m
2026-07-19 ASL25F AYT → BEG Jul 19, 06:35 UTCJul 19, 08:25 UTC1h 50m
2026-07-19 ASL90J BEG → AYT Jul 19, 03:15 UTCJul 19, 04:55 UTC1h 40m
2026-07-18 ASL135 SVO → BEG Jul 18, 23:55 UTCJul 19, 00:55 UTC1h 0m
2026-07-18 ASL135 SVO → BEG Jul 18, 21:55 UTCJul 18, 22:20 UTC25m
2026-07-18 ASL134 - Jul 18, 17:35 UTCJul 18, 19:25 UTC1h 50m
2026-07-18 ASL39G TBS → BEG Jul 18, 13:10 UTCJul 18, 15:05 UTC1h 55m
2026-07-18 ASL80L - Jul 18, 10:20 UTCJul 18, 11:50 UTC1h 30m
2026-07-18 ASL26E - Jul 18, 06:45 UTCJul 18, 08:20 UTC1h 35m

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

Mode-S 4C01F3 frequently asked

What is Mode-S code 4C01F3?
4C01F3 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-APT.
Where is Mode-S 4C01F3 registered?
Mode-S code 4C01F3 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C01F3 broadcasting right now?
Yes. Mode-S 4C01F3 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C01F3, octal 23000763, decimal 4,981,235.
What flights does 4C01F3 operate?
Mode-S 4C01F3 has broadcast 20 distinct callsigns, including ASL134, ASL132, ASL133, ASL135, ASL73B.