Apparatus

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sensors Mode-S transponder

4C01E2

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-APC · AIRBUS A-319

Hex
4C01E2
Octal
23000742
Decimal
4,981,218
Country
RS
Tail
YU-APC
Type
A319
No current signal · last broadcast 5h ago
Flights observed
544
Distinct callsigns
20
Country
RS
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 4C01E2.

Country allocation

The ICAO 24-bit address 4C01E2 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
ASL95E - 13 2026-06-25
ASL78N - 12 2026-07-07
ASL56D - 12 2026-07-07
ASL41E Spurling Aviation 12 2026-07-07
ASL37J - 12 2026-07-06
ASL18F - 12 2026-07-07
ASL1425 Spurling Aviation 12 2026-07-07
ASL1424 Spurling Aviation 12 2026-07-07
ASL12H - 11 2026-07-02
ASL10A Spurling Aviation 11 2026-07-02
ASL93X - 10 2026-06-28
ASL84J Spurling Aviation 10 2026-06-04
ASL68F Spurling Aviation 10 2026-06-03
ASL427 - 10 2026-07-09
ASL37R - 10 2026-06-28
ASL88G Spurling Aviation 9 2026-06-11
ASL82X Spurling Aviation 9 2026-06-11
ASL426 - 9 2026-07-08
ASL91K - 8 2026-06-25
ASL82Y - 8 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ASL11B BCN → BEG Jul 13, 19:35 UTCJul 13, 21:35 UTC2h 0m
2026-07-13 ASL73J BEG → BCN Jul 13, 15:45 UTCJul 13, 18:10 UTC2h 25m
2026-07-13 ASL73B TGD → BEG Jul 13, 13:45 UTCJul 13, 14:20 UTC35m
2026-07-13 ASL32A BEG → TIV Jul 13, 12:05 UTCJul 13, 12:30 UTC25m
2026-07-13 ASL48X - Jul 13, 08:20 UTCJul 13, 10:40 UTC2h 20m
2026-07-13 ASL38M - Jul 13, 05:01 UTCJul 13, 07:05 UTC2h 5m
2026-07-12 ASL65W ARN → BEG Jul 12, 19:10 UTCJul 12, 21:25 UTC2h 15m
2026-07-12 ASL82Y BEG → ARN Jul 12, 15:30 UTCJul 12, 17:50 UTC2h 20m
2026-07-12 ASL99L - Jul 12, 10:50 UTCJul 12, 11:20 UTC30m
2026-07-12 ASL52N - Jul 12, 09:00 UTCJul 12, 09:25 UTC25m
2026-07-12 ASL15A - Jul 12, 06:25 UTCJul 12, 06:55 UTC30m
2026-07-12 ASL57F - Jul 12, 04:40 UTCJul 12, 05:01 UTC20m
2026-07-11 ASL10P BEG → AMS Jul 11, 20:15 UTCJul 11, 21:40 UTC1h 25m
2026-07-11 ASL24E BEG → AHO Jul 11, 16:45 UTCJul 11, 18:20 UTC1h 35m
2026-07-11 ASL64T SKG → BEG Jul 11, 14:25 UTCJul 11, 15:20 UTC55m
2026-07-11 ASL46G BEG → SKG Jul 11, 12:20 UTCJul 11, 13:10 UTC50m
2026-07-11 ASL71G - Jul 11, 09:05 UTCJul 11, 11:00 UTC1h 55m
2026-07-11 ASL86T - Jul 11, 04:45 UTCJul 11, 07:05 UTC2h 20m
2026-07-10 ASL45X - Jul 10, 20:05 UTCJul 10, 21:50 UTC1h 45m
2026-07-10 ASL49U - Jul 10, 16:15 UTCJul 10, 18:35 UTC2h 20m
2026-07-10 ASL423 - Jul 10, 13:30 UTCJul 10, 14:45 UTC1h 15m
2026-07-10 ASL422 - Jul 10, 10:45 UTCJul 10, 11:55 UTC1h 10m
2026-07-10 ASL96C STR → BEG Jul 10, 07:50 UTCJul 10, 09:05 UTC1h 15m
2026-07-10 ASL89B BEG → STR Jul 10, 05:10 UTCJul 10, 06:45 UTC1h 35m
2026-07-09 ASL98C ZRH → BEG Jul 9, 18:55 UTCJul 9, 20:10 UTC1h 15m
2026-07-09 ASL90F BEG → ZRH Jul 9, 16:10 UTCJul 9, 17:40 UTC1h 30m
2026-07-09 ASL86U - Jul 9, 14:15 UTCJul 9, 14:55 UTC40m
2026-07-09 ASL87A - Jul 9, 12:30 UTCJul 9, 12:55 UTC25m
2026-07-09 ASL71G - Jul 9, 08:55 UTCJul 9, 10:55 UTC2h 0m
2026-07-09 ASL86T - Jul 9, 04:55 UTCJul 9, 07:05 UTC2h 10m
2026-07-09 ASL427 - Jul 9, 01:45 UTCJul 9, 03:00 UTC1h 15m
2026-07-08 ASL426 - Jul 8, 23:20 UTCJul 9, 00:25 UTC1h 5m
2026-07-08 ASL30L - Jul 8, 20:25 UTCJul 8, 20:55 UTC30m
2026-07-08 ASL24M - Jul 8, 18:50 UTCJul 8, 19:15 UTC25m
2026-07-08 ASL22Q TIV → BEG Jul 8, 17:00 UTCJul 8, 17:30 UTC30m
2026-07-08 ASL30D SKP → BEG Jul 8, 15:20 UTCJul 8, 15:45 UTC25m
2026-07-08 ASL433 ADB → BEG Jul 8, 12:40 UTCJul 8, 14:00 UTC1h 20m
2026-07-08 ASL432 CDG → SOF Jul 8, 10:15 UTCJul 8, 11:30 UTC1h 15m
2026-07-08 ASL48F - Jul 8, 08:20 UTCJul 8, 08:45 UTC25m
2026-07-08 ASL72M - Jul 8, 06:50 UTCJul 8, 07:10 UTC20m
2026-07-08 ASL44F - Jul 8, 05:10 UTCJul 8, 05:25 UTC15m
2026-07-07 ASL41E CGN → INI Jul 7, 20:55 UTCJul 7, 22:25 UTC1h 30m
2026-07-07 ASL56D - Jul 7, 17:40 UTCJul 7, 19:45 UTC2h 5m
2026-07-07 ASL1425 IST → INI Jul 7, 15:45 UTCJul 7, 16:40 UTC55m
2026-07-07 ASL1424 INI → IST Jul 7, 13:30 UTCJul 7, 14:30 UTC1h 0m
2026-07-07 ASL18F - Jul 7, 10:15 UTCJul 7, 12:00 UTC1h 45m
2026-07-07 ASL78N - Jul 7, 05:20 UTCJul 7, 07:15 UTC1h 55m
2026-07-06 ASL37J - Jul 6, 23:00 UTCJul 6, 23:20 UTC20m
2026-07-06 ASL15M - Jul 6, 17:05 UTCJul 6, 19:40 UTC2h 35m
2026-07-06 ASL53L - Jul 6, 12:45 UTCJul 6, 15:45 UTC3h 0m

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

Mode-S 4C01E2 frequently asked

What is Mode-S code 4C01E2?
4C01E2 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-APC.
Where is Mode-S 4C01E2 registered?
Mode-S code 4C01E2 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C01E2 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C01E2, octal 23000742, decimal 4,981,218.
What flights does 4C01E2 operate?
Mode-S 4C01E2 has broadcast 20 distinct callsigns, including ASL95E, ASL78N, ASL56D, ASL41E, ASL37J.