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
No current signal · last broadcast Jul 26, 20:15 UTC
Flights observed
406
Distinct callsigns
20
Country
RS
Last broadcast
Jul 26, 20:15 UTC

Last known position

Most recent position reported by Mode-S 4C01F2.

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
ASL73B Spurling Aviation 20 2026-07-18
ASL32A Spurling Aviation 20 2026-07-18
ASL134 - 19 2026-07-21
ASL136 Spurling Aviation 11 2026-07-25
ASL135 Spurling Aviation 10 2026-07-22
ASL86T - 9 2026-07-06
ASL71G - 9 2026-07-06
ASL93X - 8 2026-07-21
ASL49U - 8 2026-07-15
ASL37R - 8 2026-07-21
ASL45X - 7 2026-07-15
ASL30D Spurling Aviation 7 2026-07-10
ASL22Q Spurling Aviation 7 2026-07-10
ASL98C - 5 2026-07-18
ASL96D - 5 2026-07-05
ASL69U Spurling Aviation 5 2026-07-23
ASL64R - 5 2026-07-05
ASL63H Spurling Aviation 5 2026-07-21
ASL51N Spurling Aviation 5 2026-07-21
ASL37H Spurling Aviation 5 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL17G OPO → BEG Jul 26, 16:45 UTCJul 26, 20:10 UTC3h 25m
2026-07-26 ASL25G BEG → GYD Jul 26, 12:10 UTCJul 26, 14:55 UTC2h 45m
2026-07-26 ASL137 SVO → BEG Jul 26, 03:05 UTCJul 26, 04:00 UTC55m
2026-07-26 ASL137 SVO → BEG Jul 26, 01:05 UTCJul 26, 01:45 UTC40m
2026-07-25 ASL136 BEG → SVO Jul 25, 20:45 UTCJul 25, 22:40 UTC1h 55m
2026-07-24 ASL136 - Jul 24, 20:15 UTCJul 24, 21:40 UTC1h 25m
2026-07-24 ASL19N LJU → BEG Jul 24, 13:20 UTCJul 24, 13:50 UTC30m
2026-07-24 ASL690 - Jul 24, 11:10 UTCJul 24, 11:30 UTC20m
2026-07-24 ASL9599 BEG → BEG Jul 24, 03:20 UTCJul 24, 09:10 UTC5h 50m
2026-07-23 ASL132 - Jul 23, 13:40 UTCJul 23, 15:25 UTC1h 45m
2026-07-23 ASL37H VLC → BEG Jul 23, 08:40 UTCJul 23, 11:20 UTC2h 40m
2026-07-23 ASL69U BEG → VLC Jul 23, 04:15 UTCJul 23, 06:50 UTC2h 35m
2026-07-22 ASL135 SVO → BEG Jul 22, 17:15 UTCJul 23, 00:45 UTC7h 30m
2026-07-22 ASL95T - Jul 22, 14:05 UTCJul 22, 15:25 UTC1h 20m
2026-07-22 ASL15F - Jul 22, 11:30 UTCJul 22, 12:50 UTC1h 20m
2026-07-22 ASL24E BEG → AHO Jul 22, 05:20 UTCJul 22, 05:25 UTC5m
2026-07-21 ASL134 BEG → BEG Jul 21, 17:05 UTCJul 21, 23:50 UTC6h 45m
2026-07-21 ASL37R - Jul 21, 14:25 UTCJul 21, 14:50 UTC25m
2026-07-21 ASL93X - Jul 21, 12:30 UTCJul 21, 13:05 UTC35m
2026-07-21 ASL51N BEG → BEG Jul 21, 09:10 UTCJul 21, 11:15 UTC2h 5m
2026-07-21 ASL63H BEG → ZRH Jul 21, 05:10 UTCJul 21, 07:50 UTC2h 40m
2026-07-20 ASL124 BEG → BEG Jul 20, 19:05 UTCJul 21, 01:40 UTC6h 34m
2026-07-20 ASL37R - Jul 20, 17:05 UTCJul 20, 17:30 UTC25m
2026-07-20 ASL93X - Jul 20, 15:20 UTCJul 20, 15:50 UTC30m
2026-07-20 ASL120 BEG → LED Jul 20, 05:05 UTCJul 20, 07:20 UTC2h 15m
2026-07-19 ASL136 - Jul 19, 20:25 UTCJul 19, 22:15 UTC1h 50m
2026-07-19 ASL689 - Jul 19, 18:00 UTCJul 19, 18:30 UTC30m
2026-07-19 ASL688 - Jul 19, 16:15 UTCJul 19, 16:40 UTC25m
2026-07-19 ASL29A - Jul 19, 12:30 UTCJul 19, 14:30 UTC2h 0m
2026-07-19 ASL68E - Jul 19, 08:30 UTCJul 19, 10:15 UTC1h 45m
2026-07-19 ASL9535 - Jul 19, 05:45 UTCJul 19, 07:15 UTC1h 30m
2026-07-19 ASL9534 - Jul 19, 03:10 UTCJul 19, 04:40 UTC1h 30m
2026-07-18 ASL98C ZRH → BEG Jul 18, 19:50 UTCJul 18, 21:10 UTC1h 20m
2026-07-18 ASL90F BEG → ZRH Jul 18, 17:10 UTCJul 18, 18:50 UTC1h 40m
2026-07-18 ASL73B TGD → BEG Jul 18, 14:25 UTCJul 18, 14:55 UTC30m
2026-07-18 ASL32A BEG → TIV Jul 18, 12:25 UTCJul 18, 12:45 UTC20m
2026-07-18 ASL44B - Jul 18, 07:00 UTCJul 18, 08:50 UTC1h 50m
2026-07-18 ASL35B - Jul 18, 03:55 UTCJul 18, 05:50 UTC1h 55m
2026-07-17 ASL134 BEG → BEG Jul 17, 19:49 UTCJul 18, 02:45 UTC6h 55m
2026-07-17 ASL130 - Jul 17, 10:50 UTCJul 17, 12:50 UTC2h 0m
2026-07-17 ASL64D - Jul 17, 07:00 UTCJul 17, 08:54 UTC1h 55m
2026-07-17 ASL53A - Jul 17, 03:25 UTCJul 17, 05:15 UTC1h 50m
2026-07-16 ASL85L - Jul 16, 19:45 UTCJul 16, 21:45 UTC2h 0m
2026-07-16 ASL23Z - Jul 16, 16:00 UTCJul 16, 18:29 UTC2h 30m
2026-07-16 ASL73B TGD → BEG Jul 16, 14:10 UTCJul 16, 14:45 UTC35m
2026-07-16 ASL32A BEG → TIV Jul 16, 12:20 UTCJul 16, 12:49 UTC30m
2026-07-16 ASL37H VLC → BEG Jul 16, 08:20 UTCJul 16, 10:50 UTC2h 30m
2026-07-16 ASL69U BEG → VLC Jul 16, 04:15 UTCJul 16, 06:50 UTC2h 35m
2026-07-15 ASL45X - Jul 15, 21:00 UTCJul 15, 22:50 UTC1h 50m
2026-07-15 ASL49U BEG → CDG Jul 15, 16:40 UTCJul 15, 19:00 UTC2h 20m

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?
No active broadcast right now. Last signal was Jul 26, 20:15 UTC.
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 ASL73B, ASL32A, ASL134, ASL136, ASL135.