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
Broadcasting now · callsign ASL42A · 34,000 ft
Flights observed
479
Distinct callsigns
20
Country
RS
Last broadcast
Jul 26, 21:55 UTC

Current position

4C01EC is currently broadcasting. Map zoomed to live position.

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 - 21 2026-07-12
ASL10A Spurling Aviation 14 2026-07-22
ASL42A Spurling Aviation 13 2026-06-05
ASL12H - 13 2026-07-18
ASL20K Spurling Aviation 12 2026-06-05
ASL137 - 12 2026-07-10
ASL124 - 11 2026-07-10
ASL188 Spurling Aviation 9 2026-07-25
ASL178 - 9 2026-07-03
ASL122 Spurling Aviation 9 2026-07-08
ASL87A - 8 2026-07-23
ASL86U Spurling Aviation 8 2026-07-23
ASL84J - 7 2026-07-16
ASL83E - 7 2026-07-10
ASL68F - 7 2026-07-15
ASL57F Spurling Aviation 7 2026-07-22
ASL84H - 6 2026-06-25
ASL81K - 6 2026-06-25
ASL36F Spurling Aviation 6 2026-07-24
ASL186 Spurling Aviation 6 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL57T VLC → BEG Jul 26, 19:35 UTCJul 26, 21:50 UTC2h 15m
2026-07-26 ASL67A ZAG → BEG Jul 26, 15:45 UTCJul 26, 18:30 UTC2h 45m
2026-07-26 ASL91K TBS → BEG Jul 26, 11:00 UTCJul 26, 13:55 UTC2h 55m
2026-07-26 ASL95E BEG → TBS Jul 26, 06:45 UTCJul 26, 09:25 UTC2h 40m
2026-07-25 ASL188 BEG → KZN Jul 25, 19:05 UTCJul 26, 03:45 UTC8h 40m
2026-07-25 ASL47E LCA → BEG Jul 25, 15:15 UTCJul 25, 17:40 UTC2h 25m
2026-07-25 ASL71H BEG → LCA Jul 25, 12:05 UTCJul 25, 14:05 UTC2h 0m
2026-07-25 ASL76H ARN → BEG Jul 25, 08:25 UTCJul 25, 10:35 UTC2h 10m
2026-07-25 ASL96K BEG → ARN Jul 25, 04:45 UTCJul 25, 07:15 UTC2h 30m
2026-07-24 ASL186 BEG → GOJ Jul 24, 18:45 UTCJul 25, 02:10 UTC7h 25m
2026-07-24 ASL36F CHQ → BEG Jul 24, 14:00 UTCJul 24, 15:25 UTC1h 25m
2026-07-24 ASL14E BEG → JMK Jul 24, 11:35 UTCJul 24, 13:00 UTC1h 25m
2026-07-24 ASL88G ZRH → BEG Jul 24, 08:35 UTCJul 24, 10:00 UTC1h 25m
2026-07-24 ASL82X BEG → ZRH Jul 24, 05:25 UTCJul 24, 06:55 UTC1h 30m
2026-07-23 ASL64P BEG → CPH Jul 23, 19:05 UTCJul 23, 20:40 UTC1h 35m
2026-07-23 ASL78P BEG → CHQ Jul 23, 15:50 UTCJul 23, 17:40 UTC1h 50m
2026-07-23 ASL86U HAJ → BEG Jul 23, 14:10 UTCJul 23, 14:45 UTC35m
2026-07-23 ASL87A - Jul 23, 12:25 UTCJul 23, 12:55 UTC30m
2026-07-23 ASL131 BEG → BEG Jul 23, 03:50 UTCJul 23, 11:10 UTC7h 20m
2026-07-22 ASL17G OPO → BEG Jul 22, 17:50 UTCJul 23, 01:50 UTC8h 0m
2026-07-22 ASL10A BEG → ZRH Jul 22, 13:10 UTCJul 22, 15:20 UTC2h 10m
2026-07-22 ASL57F BEG → CDG Jul 22, 04:45 UTCJul 22, 05:05 UTC20m
2026-07-21 ASL9027 CPH → BEG Jul 21, 23:40 UTCJul 22, 02:20 UTC2h 40m
2026-07-21 ASL9026 BEG → BFS Jul 21, 19:15 UTCJul 21, 22:20 UTC3h 5m
2026-07-21 ASL16G MXP → BEG Jul 21, 08:55 UTCJul 21, 10:05 UTC1h 10m
2026-07-21 ASL58V BEG → KRK Jul 21, 05:40 UTCJul 21, 07:10 UTC1h 30m
2026-07-21 ASL33J - Jul 21, 02:15 UTCJul 21, 02:45 UTC30m
2026-07-21 ASL47G BEG → SKP Jul 21, 00:50 UTCJul 21, 01:15 UTC25m
2026-07-20 ASL67Q NCE → BEG Jul 20, 21:10 UTCJul 20, 22:30 UTC1h 20m
2026-07-20 ASL18Q BEG → NCE Jul 20, 18:10 UTCJul 20, 19:50 UTC1h 40m
2026-07-20 ASL36F CHQ → BEG Jul 20, 15:35 UTCJul 20, 16:55 UTC1h 20m
2026-07-20 ASL14E BEG → JMK Jul 20, 12:40 UTCJul 20, 14:00 UTC1h 20m
2026-07-20 ASL38K AMS → BEG Jul 20, 08:40 UTCJul 20, 10:30 UTC1h 50m
2026-07-20 ASL26G BEG → AMS Jul 20, 05:10 UTCJul 20, 07:20 UTC2h 10m
2026-07-19 ASL14A ATH → BEG Jul 19, 20:45 UTCJul 19, 22:05 UTC1h 20m
2026-07-19 ASL46F BEG → ATH Jul 19, 18:20 UTCJul 19, 19:40 UTC1h 20m
2026-07-19 ASL16C HER → BEG Jul 19, 13:50 UTCJul 19, 15:20 UTC1h 30m
2026-07-19 ASL25H BEG → JMK Jul 19, 10:10 UTCJul 19, 11:35 UTC1h 25m
2026-07-18 ASL188 BEG → KZN Jul 18, 18:35 UTCJul 19, 03:15 UTC8h 40m
2026-07-18 ASL10A BEG → ZRH Jul 18, 13:00 UTCJul 18, 15:10 UTC2h 10m
2026-07-18 ASL12H BEG → LHR Jul 18, 08:55 UTCJul 18, 11:25 UTC2h 30m
2026-07-17 ASL186 BEG → GOJ Jul 17, 18:55 UTCJul 18, 02:35 UTC7h 40m
2026-07-17 ASL10A BEG → ZRH Jul 17, 13:10 UTCJul 17, 15:20 UTC2h 10m
2026-07-17 ASL12H BEG → LHR Jul 17, 08:45 UTCJul 17, 11:15 UTC2h 30m
2026-07-17 ASL72P CDG → BEG Jul 17, 06:35 UTCJul 17, 07:30 UTC55m
2026-07-17 ASL93M - Jul 17, 04:14 UTCJul 17, 05:15 UTC1h 0m
2026-07-16 ASL64P BEG → CPH Jul 16, 19:14 UTCJul 16, 20:55 UTC1h 40m
2026-07-16 ASL78P BEG → CHQ Jul 16, 16:00 UTCJul 16, 18:00 UTC2h 0m
2026-07-16 ASL86U - Jul 16, 14:00 UTCJul 16, 14:35 UTC35m
2026-07-16 ASL87A - Jul 16, 12:14 UTCJul 16, 12:49 UTC35m

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?
Yes. Mode-S 4C01EC is currently airborne.
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, ASL10A, ASL42A, ASL12H, ASL20K.