Apparatus

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sensors Mode-S transponder

4C01EB

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-APL · AIRBUS A-319

Hex
4C01EB
Octal
23000753
Decimal
4,981,227
Country
RS
Tail
YU-APL
Type
A319
Transponder active on ground
Flights observed
532
Distinct callsigns
20
Country
RS
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S 4C01EB.

Country allocation

The ICAO 24-bit address 4C01EB 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
ASL12H - 17 2026-07-23
ASL10A Spurling Aviation 17 2026-07-23
ASL57F Spurling Aviation 13 2026-07-25
ASL15A Spurling Aviation 13 2026-07-25
ASL137 - 13 2026-07-09
ASL136 - 13 2026-07-08
ASL122 Spurling Aviation 11 2026-07-14
ASL88G - 9 2026-07-17
ASL84J - 9 2026-07-18
ASL82X - 9 2026-07-17
ASL68F Spurling Aviation 9 2026-07-17
ASL124 - 9 2026-07-24
ASL123 Spurling Aviation 9 2026-07-14
ASL48X - 7 2026-07-06
ASL38M - 7 2026-07-06
ASL19P - 7 2026-07-07
ASL178 Spurling Aviation 7 2026-07-24
ASL87A - 6 2026-07-21
ASL86U - 6 2026-07-21
ASL17G - 6 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL11B PUY → BEG Jul 26, 19:10 UTCJul 26, 21:10 UTC2h 0m
2026-07-26 ASL73J BEG → HAM Jul 26, 15:30 UTCJul 26, 17:40 UTC2h 10m
2026-07-26 ASL99L - Jul 26, 11:15 UTCJul 26, 11:50 UTC35m
2026-07-26 ASL52N BEG → TIV Jul 26, 09:20 UTCJul 26, 09:30 UTC10m
2026-07-26 ASL85D - Jul 26, 06:00 UTCJul 26, 07:10 UTC1h 11m
2026-07-26 ASL38F - Jul 26, 03:40 UTCJul 26, 04:50 UTC1h 10m
2026-07-25 ASL133 SVO → BEG Jul 25, 19:25 UTCJul 25, 20:15 UTC50m
2026-07-25 ASL133 SVO → BEG Jul 25, 17:35 UTCJul 25, 18:00 UTC25m
2026-07-25 ASL132 - Jul 25, 13:30 UTCJul 25, 15:35 UTC2h 5m
2026-07-25 ASL17A - Jul 25, 10:50 UTCJul 25, 12:00 UTC1h 10m
2026-07-25 ASL79W - Jul 25, 08:50 UTCJul 25, 09:45 UTC55m
2026-07-25 ASL15A TGD → BEG Jul 25, 06:35 UTCJul 25, 06:55 UTC20m
2026-07-25 ASL57F BEG → CDG Jul 25, 04:55 UTCJul 25, 05:05 UTC10m
2026-07-24 ASL125 LED → BEG Jul 24, 22:25 UTCJul 24, 23:15 UTC50m
2026-07-24 ASL124 - Jul 24, 17:05 UTCJul 24, 19:45 UTC2h 40m
2026-07-24 ASL178 BEG → AER Jul 24, 08:30 UTCJul 24, 09:50 UTC1h 20m
2026-07-24 ASL15A TGD → BEG Jul 24, 06:45 UTCJul 24, 07:15 UTC30m
2026-07-24 ASL57F BEG → CDG Jul 24, 05:00 UTCJul 24, 05:20 UTC20m
2026-07-23 ASL188 BEG → KZN Jul 23, 18:40 UTCJul 24, 03:25 UTC8h 45m
2026-07-23 ASL10A BEG → ZRH Jul 23, 12:55 UTCJul 23, 15:10 UTC2h 15m
2026-07-23 ASL12H BEG → LHR Jul 23, 08:45 UTCJul 23, 11:15 UTC2h 30m
2026-07-23 ASL81K - Jul 23, 07:00 UTCJul 23, 07:35 UTC35m
2026-07-23 ASL84H BEG → TIV Jul 23, 05:05 UTCJul 23, 05:25 UTC20m
2026-07-22 ASL30L - Jul 22, 20:25 UTCJul 22, 20:50 UTC25m
2026-07-22 ASL24M - Jul 22, 18:45 UTCJul 22, 19:05 UTC20m
2026-07-22 ASL22Q TIV → BEG Jul 22, 17:05 UTCJul 22, 17:35 UTC30m
2026-07-22 ASL30D SKP → BEG Jul 22, 15:30 UTCJul 22, 15:50 UTC20m
2026-07-22 ASL9871 - Jul 22, 03:25 UTCJul 22, 04:55 UTC1h 30m
2026-07-22 ASL9870 - Jul 22, 00:20 UTCJul 22, 02:00 UTC1h 40m
2026-07-21 ASL45X CDG → BEG Jul 21, 20:40 UTCJul 21, 22:40 UTC2h 0m
2026-07-21 ASL49U BEG → CDG Jul 21, 16:35 UTCJul 21, 18:50 UTC2h 15m
2026-07-21 ASL86U - Jul 21, 14:10 UTCJul 21, 14:45 UTC35m
2026-07-21 ASL87A - Jul 21, 12:25 UTCJul 21, 12:55 UTC30m
2026-07-21 ASL71G - Jul 21, 08:45 UTCJul 21, 10:35 UTC1h 50m
2026-07-21 ASL86T BEG → CDG Jul 21, 05:00 UTCJul 21, 07:20 UTC2h 20m
2026-07-21 ASL91K TBS → BEG Jul 21, 00:15 UTCJul 21, 03:05 UTC2h 50m
2026-07-20 ASL95E - Jul 20, 18:55 UTCJul 20, 20:05 UTC1h 10m
2026-07-20 ASL66K CPH → BEG Jul 20, 12:30 UTCJul 20, 14:15 UTC1h 45m
2026-07-20 ASL14B BEG → CPH Jul 20, 08:50 UTCJul 20, 10:45 UTC1h 55m
2026-07-20 ASL15A - Jul 20, 06:30 UTCJul 20, 07:00 UTC30m
2026-07-20 ASL57F - Jul 20, 04:55 UTCJul 20, 05:15 UTC20m
2026-07-19 ASL17G BEG → BEG Jul 19, 11:55 UTCJul 19, 20:15 UTC8h 20m
2026-07-19 ASL130 BEG → BEG Jul 19, 03:50 UTCJul 19, 10:35 UTC6h 45m
2026-07-18 ASL133 BEG → BEG Jul 18, 14:25 UTCJul 18, 21:10 UTC6h 45m
2026-07-18 ASL17A - Jul 18, 11:05 UTCJul 18, 12:05 UTC1h 0m
2026-07-18 ASL79W - Jul 18, 08:50 UTCJul 18, 09:50 UTC1h 0m
2026-07-18 ASL15A - Jul 18, 06:25 UTCJul 18, 06:50 UTC25m
2026-07-18 ASL57F - Jul 18, 04:40 UTCJul 18, 05:00 UTC20m
2026-07-18 ASL84J LCA → BEG Jul 18, 01:10 UTCJul 18, 03:30 UTC2h 21m
2026-07-17 ASL68F CGN → INI Jul 17, 22:00 UTCJul 18, 00:04 UTC2h 5m

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

Mode-S 4C01EB frequently asked

What is Mode-S code 4C01EB?
4C01EB is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-APL.
Where is Mode-S 4C01EB registered?
Mode-S code 4C01EB is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C01EB broadcasting right now?
Mode-S 4C01EB is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C01EB, octal 23000753, decimal 4,981,227.
What flights does 4C01EB operate?
Mode-S 4C01EB has broadcast 20 distinct callsigns, including ASL12H, ASL10A, ASL57F, ASL15A, ASL137.