Apparatus

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sensors Mode-S transponder

4C01ED

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-APN · AIRBUS A-319

Hex
4C01ED
Octal
23000755
Decimal
4,981,229
Country
RS
Tail
YU-APN
Type
A319
No current signal · last broadcast 1h ago
Flights observed
383
Distinct callsigns
20
Country
RS
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 4C01ED.

Country allocation

The ICAO 24-bit address 4C01ED 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
ASL136 - 10 2026-07-18
ASL93X - 9 2026-07-16
ASL37R - 9 2026-07-16
ASL124 - 9 2026-07-09
ASL95E Spurling Aviation 8 2026-06-21
ASL123 Spurling Aviation 8 2026-07-18
ASL122 Spurling Aviation 8 2026-07-18
ASL84J - 7 2026-06-15
ASL68F Spurling Aviation 7 2026-06-14
ASL58V - 7 2026-07-02
ASL49G - 7 2026-07-18
ASL188 Spurling Aviation 7 2026-07-16
ASL16G - 7 2026-07-02
ASL86T - 6 2026-07-15
ASL71G - 6 2026-07-15
ASL57Z - 6 2026-07-18
ASL427 - 6 2026-07-13
ASL426 - 6 2026-07-12
ASL423 - 6 2026-07-17
ASL422 - 6 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 ASL136 BEG → BEG Jul 18, 20:15 UTCJul 19, 02:50 UTC6h 35m
2026-07-18 ASL123 LED → BEG Jul 18, 15:55 UTCJul 18, 18:30 UTC2h 35m
2026-07-18 ASL122 BEG → LED Jul 18, 12:20 UTCJul 18, 14:40 UTC2h 20m
2026-07-18 ASL57Z OSL → BEG Jul 18, 08:00 UTCJul 18, 10:45 UTC2h 45m
2026-07-18 ASL49G BEG → OSL Jul 18, 04:15 UTCJul 18, 06:40 UTC2h 25m
2026-07-17 ASL44H - Jul 17, 19:00 UTCJul 17, 20:25 UTC1h 25m
2026-07-17 ASL86W BEG → BER Jul 17, 16:15 UTCJul 17, 17:44 UTC1h 30m
2026-07-17 ASL423 - Jul 17, 13:29 UTCJul 17, 14:44 UTC1h 15m
2026-07-17 ASL422 - Jul 17, 10:40 UTCJul 17, 11:45 UTC1h 5m
2026-07-17 ASL96C STR → BEG Jul 17, 07:35 UTCJul 17, 08:59 UTC1h 25m
2026-07-17 ASL89B BEG → STR Jul 17, 05:10 UTCJul 17, 06:40 UTC1h 30m
2026-07-16 ASL188 BEG → KZN Jul 16, 18:34 UTCJul 17, 02:54 UTC8h 20m
2026-07-16 ASL37R - Jul 16, 14:29 UTCJul 16, 15:05 UTC35m
2026-07-16 ASL93X - Jul 16, 12:40 UTCJul 16, 13:10 UTC30m
2026-07-16 ASL60B - Jul 16, 06:40 UTCJul 16, 08:30 UTC1h 50m
2026-07-16 ASL38H BEG → AYT Jul 16, 03:20 UTCJul 16, 05:05 UTC1h 45m
2026-07-15 ASL123 LED → BEG Jul 15, 16:30 UTCJul 15, 18:50 UTC2h 20m
2026-07-15 ASL122 BEG → LED Jul 15, 12:50 UTCJul 15, 15:25 UTC2h 35m
2026-07-15 ASL71G - Jul 15, 09:05 UTCJul 15, 10:50 UTC1h 45m
2026-07-15 ASL86T BEG → CDG Jul 15, 04:50 UTCJul 15, 07:15 UTC2h 25m
2026-07-14 ASL45X - Jul 14, 19:40 UTCJul 14, 21:40 UTC2h 0m
2026-07-14 ASL49U - Jul 14, 15:15 UTCJul 14, 17:40 UTC2h 25m
2026-07-14 ASL73B TGD → BEG Jul 14, 13:40 UTCJul 14, 14:00 UTC20m
2026-07-14 ASL32A BEG → TIV Jul 14, 12:00 UTCJul 14, 12:20 UTC20m
2026-07-14 ASL57Z OSL → BEG Jul 14, 07:55 UTCJul 14, 10:10 UTC2h 15m
2026-07-14 ASL49G BEG → OSL Jul 14, 04:15 UTCJul 14, 06:45 UTC2h 30m
2026-07-13 ASL125 BEG → BEG Jul 13, 18:05 UTCJul 14, 00:10 UTC6h 5m
2026-07-13 ASL16C - Jul 13, 15:00 UTCJul 13, 16:35 UTC1h 35m
2026-07-13 ASL25H - Jul 13, 11:35 UTCJul 13, 13:00 UTC1h 25m
2026-07-13 ASL66K CPH → BEG Jul 13, 08:25 UTCJul 13, 10:15 UTC1h 50m
2026-07-13 ASL14B BEG → CPH Jul 13, 05:15 UTCJul 13, 07:10 UTC1h 55m
2026-07-13 ASL427 - Jul 13, 01:35 UTCJul 13, 02:45 UTC1h 10m
2026-07-12 ASL426 - Jul 12, 23:05 UTCJul 13, 00:20 UTC1h 15m
2026-07-12 ASL45X - Jul 12, 19:30 UTCJul 12, 21:25 UTC1h 55m
2026-07-12 ASL49U - Jul 12, 15:45 UTCJul 12, 18:05 UTC2h 20m
2026-07-12 ASL37R - Jul 12, 14:01 UTCJul 12, 14:30 UTC30m
2026-07-12 ASL93X - Jul 12, 12:15 UTCJul 12, 12:35 UTC20m
2026-07-12 ASL130 - Jul 12, 03:45 UTCJul 12, 06:01 UTC2h 15m
2026-07-11 ASL123 LED → BEG Jul 11, 17:45 UTCJul 11, 19:45 UTC2h 0m
2026-07-11 ASL122 BEG → LED Jul 11, 12:30 UTCJul 11, 16:00 UTC3h 30m
2026-07-11 ASL57Z - Jul 11, 07:55 UTCJul 11, 10:15 UTC2h 20m
2026-07-11 ASL49G BEG → OSL Jul 11, 04:15 UTCJul 11, 06:50 UTC2h 35m
2026-07-10 ASL186 BEG → GOJ Jul 10, 18:50 UTCJul 11, 02:20 UTC7h 30m
2026-07-10 ASL179 AER → BEG Jul 10, 08:35 UTCJul 10, 14:35 UTC6h 0m
2026-07-10 ASL9731 - Jul 10, 05:50 UTCJul 10, 07:20 UTC1h 30m
2026-07-10 ASL9730 - Jul 10, 03:00 UTCJul 10, 04:10 UTC1h 10m
2026-07-09 ASL124 BEG → BEG Jul 9, 17:15 UTCJul 9, 23:15 UTC6h 0m
2026-07-09 ASL10A BEG → ZRH Jul 9, 13:25 UTCJul 9, 15:40 UTC2h 15m
2026-07-09 ASL12H BEG → LHR Jul 9, 08:55 UTCJul 9, 11:40 UTC2h 45m
2026-07-08 ASL17G OPO → BEG Jul 8, 22:30 UTCJul 8, 23:55 UTC1h 25m

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

Mode-S 4C01ED frequently asked

What is Mode-S code 4C01ED?
4C01ED is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-APN.
Where is Mode-S 4C01ED registered?
Mode-S code 4C01ED is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C01ED 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 4C01ED, octal 23000755, decimal 4,981,229.
What flights does 4C01ED operate?
Mode-S 4C01ED has broadcast 20 distinct callsigns, including ASL136, ASL93X, ASL37R, ASL124, ASL95E.