Apparatus

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sensors Mode-S transponder

4C01EC

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-APM · AIRBUS A-319

Hex
4C01EC
Octal
23000754
Decimal
4,981,228
Country
RS
Tail
YU-APM
Type
A319
No current signal · last broadcast 2h ago
Flights observed
223
Distinct callsigns
20
Country
RS
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 4C01EC.

Country allocation

The ICAO 24-bit address 4C01EC 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 Spurling Aviation 12 2026-05-27
ASL42A Spurling Aviation 11 2026-05-16
ASL137 Spurling Aviation 11 2026-05-28
ASL20K Spurling Aviation 10 2026-05-16
ASL124 Spurling Aviation 9 2026-05-22
ASL178 Spurling Aviation 7 2026-05-29
ASL122 Spurling Aviation 6 2026-05-06
ASL87A Spurling Aviation 5 2026-05-15
ASL86U Spurling Aviation 5 2026-05-15
ASL83E Spurling Aviation 5 2026-05-11
ASL12H Spurling Aviation 5 2026-05-28
ASL123 Spurling Aviation 5 2026-05-05
ASL10A Spurling Aviation 5 2026-05-28
ASL84H Spurling Aviation 4 2026-05-22
ASL81K Spurling Aviation 4 2026-05-22
ASL57F Spurling Aviation 4 2026-05-29
ASL15A Spurling Aviation 4 2026-05-29
ASL94D Spurling Aviation 3 2026-05-04
ASL84J Spurling Aviation 3 2026-05-04
ASL78P Spurling Aviation 3 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 ASL32A BEG → TIV May 30, 11:55 UTCMay 30, 12:30 UTC35m
2026-05-30 ASL76H ARN → BEG May 30, 08:20 UTCMay 30, 10:35 UTC2h 15m
2026-05-30 ASL96K BEG → ARN May 30, 04:45 UTCMay 30, 07:20 UTC2h 35m
2026-05-29 ASL64A BRU → BEG May 29, 19:30 UTCMay 29, 21:45 UTC2h 15m
2026-05-29 ASL72D FRA → BEG May 29, 15:45 UTCMay 29, 18:25 UTC2h 40m
2026-05-29 ASL178 BEG → AER May 29, 08:20 UTCMay 29, 14:30 UTC6h 10m
2026-05-29 ASL15A TGD → BEG May 29, 06:20 UTCMay 29, 06:45 UTC25m
2026-05-29 ASL57F BEG → CDG May 29, 04:45 UTCMay 29, 05:15 UTC30m
2026-05-28 ASL188 BEG → KZN May 28, 18:30 UTCMay 29, 02:45 UTC8h 15m
2026-05-28 ASL10A BEG → ZRH May 28, 13:05 UTCMay 28, 15:25 UTC2h 20m
2026-05-28 ASL12H BEG → LHR May 28, 08:45 UTCMay 28, 11:50 UTC3h 5m
2026-05-28 ASL15A TGD → BEG May 28, 06:20 UTCMay 28, 06:45 UTC25m
2026-05-28 ASL57F BEG → CDG May 28, 04:40 UTCMay 28, 05:05 UTC25m
2026-05-28 ASL137 SVO → BEG May 28, 02:45 UTCMay 28, 03:05 UTC20m
2026-05-27 ASL136 BEG → SVO May 27, 20:35 UTCMay 27, 21:40 UTC1h 5m
2026-05-26 ASL186 BEG → GOJ May 26, 12:30 UTCMay 26, 20:00 UTC7h 30m
2026-05-26 ASL88G ZRH → BEG May 26, 07:49 UTCMay 26, 09:19 UTC1h 30m
2026-05-26 ASL82X BEG → ZRH May 26, 05:10 UTCMay 26, 06:39 UTC1h 30m
2026-05-26 ASL137 SVO → BEG May 26, 01:55 UTCMay 26, 02:39 UTC45m
2026-05-26 ASL137 SVO → BEG May 26, 00:04 UTCMay 26, 00:19 UTC15m
2026-05-25 ASL136 BEG → SVO May 25, 19:59 UTCMay 25, 21:04 UTC1h 5m
2026-05-25 ASL178 BEG → AER May 25, 12:00 UTCMay 25, 17:45 UTC5h 45m
2026-05-25 ASL66K CPH → BEG May 25, 07:50 UTCMay 25, 09:30 UTC1h 40m
2026-05-25 ASL14B BEG → CPH May 25, 04:40 UTCMay 25, 06:35 UTC1h 55m
2026-05-24 ASL25G BEG → GYD May 24, 12:00 UTCMay 24, 20:10 UTC8h 10m
2026-05-24 ASL121 LED → BEG May 24, 07:40 UTCMay 24, 09:55 UTC2h 15m
2026-05-24 ASL120 BEG → LED May 24, 03:50 UTCMay 24, 06:25 UTC2h 35m
2026-05-23 ASL135 SVO → BEG May 23, 23:25 UTCMay 23, 23:40 UTC15m
2026-05-23 ASL134 BEG → SVO May 23, 17:05 UTCMay 23, 18:20 UTC1h 15m
2026-05-23 ASL64T SKG → BEG May 23, 14:45 UTCMay 23, 15:40 UTC55m
2026-05-23 ASL46G BEG → BRU May 23, 11:45 UTCMay 23, 12:55 UTC1h 10m
2026-05-22 ASL125 LED → BEG May 22, 21:20 UTCMay 22, 23:25 UTC2h 5m
2026-05-22 ASL124 BEG → LED May 22, 17:05 UTCMay 22, 19:35 UTC2h 30m
2026-05-22 ASL10A BEG → ZRH May 22, 12:50 UTCMay 22, 15:05 UTC2h 15m
2026-05-22 ASL12H BEG → LHR May 22, 08:35 UTCMay 22, 11:05 UTC2h 30m
2026-05-22 ASL81K BEG → LHR May 22, 06:45 UTCMay 22, 07:15 UTC30m
2026-05-22 ASL84H BEG → TIV May 22, 05:00 UTCMay 22, 05:20 UTC20m
2026-05-22 ASL137 SVO → BEG May 22, 02:05 UTCMay 22, 03:30 UTC1h 25m
2026-05-22 ASL137 SVO → BEG May 22, 00:30 UTCMay 22, 00:40 UTC10m
2026-05-21 ASL136 BEG → SVO May 21, 20:10 UTCMay 21, 21:15 UTC1h 5m
2026-05-21 ASL47E LCA → BEG May 21, 15:25 UTCMay 21, 17:50 UTC2h 25m
2026-05-21 ASL71H BEG → LCA May 21, 12:05 UTCMay 21, 14:15 UTC2h 10m
2026-05-21 ASL37H VLC → BEG May 21, 08:05 UTCMay 21, 10:45 UTC2h 40m
2026-05-21 ASL69U BEG → VLC May 21, 04:40 UTCMay 21, 07:00 UTC2h 20m
2026-05-20 ASL137 SVO → BEG May 20, 01:05 UTCMay 20, 02:45 UTC1h 40m
2026-05-19 ASL136 BEG → SVO May 19, 20:20 UTCMay 19, 22:15 UTC1h 55m
2026-05-19 ASL71A BEG → AMS May 19, 10:55 UTCMay 19, 13:35 UTC2h 40m
2026-05-19 ASL27E BEG → MAD May 19, 06:20 UTCMay 19, 09:15 UTC2h 55m
2026-05-19 ASL137 SVO → BEG May 19, 01:55 UTCMay 19, 02:40 UTC45m
2026-05-18 ASL136 BEG → SVO May 18, 20:15 UTCMay 18, 22:10 UTC1h 55m

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

Mode-S 4C01EC frequently asked

What is Mode-S code 4C01EC?
4C01EC is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-APM.
Where is Mode-S 4C01EC registered?
Mode-S code 4C01EC is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C01EC broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C01EC, octal 23000754, decimal 4,981,228.
What flights does 4C01EC operate?
Mode-S 4C01EC has broadcast 20 distinct callsigns, including ASL136, ASL42A, ASL137, ASL20K, ASL124.