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 1h ago
Flights observed
352
Distinct callsigns
20
Country
RS
Last broadcast
1h ago

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 18 2026-07-12
ASL32A Spurling Aviation 18 2026-07-12
ASL134 - 17 2026-07-11
ASL86T - 9 2026-07-06
ASL71G - 9 2026-07-06
ASL135 - 9 2026-07-11
ASL136 - 8 2026-07-13
ASL49U - 7 2026-05-29
ASL30D Spurling Aviation 7 2026-07-10
ASL22Q Spurling Aviation 7 2026-07-10
ASL93X - 6 2026-07-10
ASL45X Spurling Aviation 6 2026-05-29
ASL37R - 6 2026-07-10
ASL96D - 5 2026-07-05
ASL64R - 5 2026-07-05
ASL98C - 4 2026-06-28
ASL63H - 4 2026-06-25
ASL52N Spurling Aviation 4 2026-06-22
ASL51N - 4 2026-06-25
ASL48X Spurling Aviation 4 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASL83Z - Jul 14, 11:15 UTCJul 14, 14:05 UTC2h 50m
2026-07-14 ASL90M - Jul 14, 06:25 UTCJul 14, 09:40 UTC3h 15m
2026-07-14 ASL137 - Jul 14, 02:00 UTCJul 14, 03:00 UTC1h 0m
2026-07-13 ASL136 - Jul 13, 20:15 UTCJul 13, 22:15 UTC2h 0m
2026-07-13 ASL47E LCA → BEG Jul 13, 15:50 UTCJul 13, 18:10 UTC2h 20m
2026-07-13 ASL71H BEG → LCA Jul 13, 12:20 UTCJul 13, 14:30 UTC2h 10m
2026-07-13 ASL46T - Jul 13, 07:35 UTCJul 13, 09:35 UTC2h 0m
2026-07-13 ASL60Q BEG → AYT Jul 13, 03:40 UTCJul 13, 05:20 UTC1h 40m
2026-07-12 ASL43N MXP → BEG Jul 12, 19:15 UTCJul 12, 20:30 UTC1h 15m
2026-07-12 ASL14G BEG → LHR Jul 12, 16:40 UTCJul 12, 18:05 UTC1h 25m
2026-07-12 ASL73B TGD → BEG Jul 12, 14:30 UTCJul 12, 15:01 UTC30m
2026-07-12 ASL32A BEG → TIV Jul 12, 12:30 UTCJul 12, 12:50 UTC20m
2026-07-12 ASL71Z - Jul 12, 06:55 UTCJul 12, 08:55 UTC2h 0m
2026-07-12 ASL55U BEG → AYT Jul 12, 03:10 UTCJul 12, 05:10 UTC2h 0m
2026-07-11 ASL135 - Jul 11, 22:50 UTCJul 11, 23:50 UTC1h 0m
2026-07-11 ASL134 - Jul 11, 16:55 UTCJul 11, 19:00 UTC2h 5m
2026-07-11 ASL39G TBS → BEG Jul 11, 13:25 UTCJul 11, 15:25 UTC2h 0m
2026-07-11 ASL80L - Jul 11, 10:40 UTCJul 11, 12:10 UTC1h 30m
2026-07-11 ASL26E - Jul 11, 06:45 UTCJul 11, 08:05 UTC1h 20m
2026-07-11 ASL47H BEG → AYT Jul 11, 03:15 UTCJul 11, 05:10 UTC1h 55m
2026-07-10 ASL22Q TIV → BEG Jul 10, 17:00 UTCJul 10, 17:25 UTC25m
2026-07-10 ASL30D SKP → BEG Jul 10, 15:20 UTCJul 10, 15:40 UTC20m
2026-07-10 ASL37R - Jul 10, 13:35 UTCJul 10, 14:05 UTC30m
2026-07-10 ASL93X - Jul 10, 11:55 UTCJul 10, 12:15 UTC20m
2026-07-10 ASL75L - Jul 10, 08:00 UTCJul 10, 10:20 UTC2h 20m
2026-07-10 ASL70X BEG → ALC Jul 10, 04:05 UTCJul 10, 06:45 UTC2h 40m
2026-07-09 ASL85L - Jul 9, 19:10 UTCJul 9, 21:15 UTC2h 5m
2026-07-09 ASL23Z - Jul 9, 15:45 UTCJul 9, 17:55 UTC2h 10m
2026-07-09 ASL73B TGD → BEG Jul 9, 14:05 UTCJul 9, 14:30 UTC25m
2026-07-09 ASL32A BEG → TIV Jul 9, 12:05 UTCJul 9, 12:25 UTC20m
2026-07-09 ASL37H VLC → BEG Jul 9, 08:00 UTCJul 9, 10:30 UTC2h 30m
2026-07-09 ASL69U BEG → VLC Jul 9, 04:10 UTCJul 9, 06:30 UTC2h 20m
2026-07-08 ASL44H - Jul 8, 19:50 UTCJul 8, 21:10 UTC1h 20m
2026-07-08 ASL86W BEG → BER Jul 8, 16:00 UTCJul 8, 17:35 UTC1h 35m
2026-07-08 ASL73B TGD → BEG Jul 8, 14:20 UTCJul 8, 14:50 UTC30m
2026-07-08 ASL32A BEG → TIV Jul 8, 11:55 UTCJul 8, 12:20 UTC25m
2026-07-08 ASL9433 - Jul 8, 07:15 UTCJul 8, 08:45 UTC1h 30m
2026-07-08 ASL9432 - Jul 8, 04:25 UTCJul 8, 05:50 UTC1h 25m
2026-07-07 ASL132 - Jul 7, 13:05 UTCJul 7, 21:00 UTC7h 55m
2026-07-07 ASL131 - Jul 7, 10:25 UTCJul 7, 11:30 UTC1h 5m
2026-07-07 ASL130 - Jul 7, 04:00 UTCJul 7, 05:55 UTC1h 55m
2026-07-06 ASL124 - Jul 6, 17:05 UTCJul 6, 19:35 UTC2h 30m
2026-07-06 ASL73B TGD → BEG Jul 6, 14:45 UTCJul 6, 15:15 UTC30m
2026-07-06 ASL32A BEG → TIV Jul 6, 12:55 UTCJul 6, 13:15 UTC20m
2026-07-06 ASL71G - Jul 6, 09:15 UTCJul 6, 11:20 UTC2h 5m
2026-07-06 ASL86T BEG → CDG Jul 6, 04:55 UTCJul 6, 07:10 UTC2h 15m
2026-07-05 ASL85L - Jul 5, 19:40 UTCJul 5, 21:50 UTC2h 10m
2026-07-05 ASL23Z - Jul 5, 15:50 UTCJul 5, 18:05 UTC2h 15m
2026-07-05 ASL96D ATH → BEG Jul 5, 13:15 UTCJul 5, 14:35 UTC1h 20m
2026-07-05 ASL64R BEG → ATH Jul 5, 10:35 UTCJul 5, 11:55 UTC1h 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 1h ago.
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, ASL86T, ASL71G.