Apparatus

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sensors Mode-S transponder

4C01EE

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-APO · AIRBUS A-320

Hex
4C01EE
Octal
23000756
Decimal
4,981,230
Country
RS
Tail
YU-APO
Type
A320
Broadcasting now · callsign ASL26E · 18,375 ft
Flights observed
411
Distinct callsigns
20
Country
RS
Last broadcast
Jul 26, 19:00 UTC

Current position

4C01EE is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4C01EE 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
ASL135 Spurling Aviation 13 2026-07-25
ASL136 - 12 2026-07-17
ASL134 - 12 2026-07-25
ASL132 - 12 2026-07-20
ASL73B Spurling Aviation 10 2026-07-24
ASL63H - 10 2026-06-18
ASL51N - 10 2026-06-18
ASL32A Spurling Aviation 10 2026-07-24
ASL47E - 9 2026-07-11
ASL30D Spurling Aviation 9 2026-07-23
ASL22Q Spurling Aviation 9 2026-07-23
ASL133 Spurling Aviation 9 2026-06-23
ASL87A Spurling Aviation 8 2026-07-26
ASL86U Spurling Aviation 8 2026-07-26
ASL71H - 8 2026-07-11
ASL131 - 8 2026-07-21
ASL130 - 8 2026-07-21
ASL57Z - 7 2026-07-13
ASL93X - 6 2026-07-14
ASL86T - 6 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL75J SOF → BEG Jul 26, 18:15 UTCJul 26, 19:00 UTC45m
2026-07-26 ASL64X PRG → BEG Jul 26, 16:05 UTCJul 26, 16:15 UTC10m
2026-07-26 ASL86U HAJ → BEG Jul 26, 14:05 UTCJul 26, 14:40 UTC35m
2026-07-26 ASL87A VIE → BEG Jul 26, 12:00 UTCJul 26, 12:25 UTC25m
2026-07-26 ASL121 LED → BEG Jul 26, 03:50 UTCJul 26, 10:00 UTC6h 11m
2026-07-25 ASL135 SVO → BEG Jul 25, 22:45 UTCJul 25, 23:40 UTC55m
2026-07-25 ASL135 SVO → BEG Jul 25, 21:10 UTCJul 25, 21:35 UTC25m
2026-07-25 ASL134 - Jul 25, 16:50 UTCJul 25, 18:55 UTC2h 5m
2026-07-25 ASL99L - Jul 25, 13:10 UTCJul 25, 13:30 UTC20m
2026-07-25 ASL52N BEG → TIV Jul 25, 10:15 UTCJul 25, 10:30 UTC15m
2026-07-25 ASL81K BEG → LHR Jul 25, 07:15 UTCJul 25, 07:30 UTC15m
2026-07-25 ASL84H BEG → TIV Jul 25, 05:05 UTCJul 25, 05:20 UTC15m
2026-07-24 ASL134 BEG → BEG Jul 24, 17:25 UTCJul 25, 00:20 UTC6h 55m
2026-07-24 ASL73B TGD → BEG Jul 24, 15:05 UTCJul 24, 15:40 UTC35m
2026-07-24 ASL32A BEG → TIV Jul 24, 13:10 UTCJul 24, 13:25 UTC15m
2026-07-24 ASL75L - Jul 24, 09:10 UTCJul 24, 11:40 UTC2h 30m
2026-07-24 ASL70X - Jul 24, 04:10 UTCJul 24, 06:50 UTC2h 40m
2026-07-23 ASL30L - Jul 23, 21:05 UTCJul 23, 21:35 UTC30m
2026-07-23 ASL24M - Jul 23, 19:20 UTCJul 23, 19:40 UTC20m
2026-07-23 ASL22Q TIV → BEG Jul 23, 17:35 UTCJul 23, 18:00 UTC25m
2026-07-23 ASL30D SKP → BEG Jul 23, 15:55 UTCJul 23, 16:15 UTC20m
2026-07-22 ASL433 ADB → BEG Jul 22, 12:40 UTCJul 22, 14:05 UTC1h 25m
2026-07-22 ASL432 - Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-22 ASL45E BEG → AYT Jul 22, 03:25 UTCJul 22, 05:25 UTC2h 0m
2026-07-21 ASL122 BEG → LED Jul 21, 15:50 UTCJul 21, 21:55 UTC6h 5m
2026-07-21 ASL131 - Jul 21, 11:55 UTCJul 21, 12:50 UTC55m
2026-07-21 ASL131 - Jul 21, 10:00 UTCJul 21, 10:35 UTC35m
2026-07-21 ASL130 - Jul 21, 04:35 UTCJul 21, 05:40 UTC1h 5m
2026-07-21 ASL427 IST → BEG Jul 21, 01:55 UTCJul 21, 03:00 UTC1h 5m
2026-07-20 ASL426 - Jul 20, 23:25 UTCJul 21, 00:40 UTC1h 14m
2026-07-20 ASL132 BEG → BEG Jul 20, 14:30 UTCJul 20, 21:40 UTC7h 10m
2026-07-20 ASL99L - Jul 20, 11:50 UTCJul 20, 12:30 UTC40m
2026-07-20 ASL52N BEG → TIV Jul 20, 09:50 UTCJul 20, 10:10 UTC20m
2026-07-20 ASL95D - Jul 20, 06:55 UTCJul 20, 08:40 UTC1h 45m
2026-07-20 ASL71C BEG → AYT Jul 20, 03:10 UTCJul 20, 05:05 UTC1h 55m
2026-07-19 ASL98C ZRH → BEG Jul 19, 18:55 UTCJul 19, 20:10 UTC1h 15m
2026-07-19 ASL90F BEG → ZRH Jul 19, 16:30 UTCJul 19, 18:00 UTC1h 30m
2026-07-19 ASL73B TGD → BEG Jul 19, 14:10 UTCJul 19, 14:40 UTC30m
2026-07-19 ASL32A BEG → TIV Jul 19, 11:55 UTCJul 19, 12:15 UTC20m
2026-07-19 ASL71Z BEG → LYS Jul 19, 06:30 UTCJul 19, 08:30 UTC2h 0m
2026-07-19 ASL55U BEG → AYT Jul 19, 03:15 UTCJul 19, 05:00 UTC1h 45m
2026-07-18 ASL433 ADB → BEG Jul 18, 14:00 UTCJul 18, 15:20 UTC1h 20m
2026-07-18 ASL432 - Jul 18, 11:40 UTCJul 18, 12:45 UTC1h 5m
2026-07-18 ASL9431 - Jul 18, 07:20 UTCJul 18, 08:45 UTC1h 25m
2026-07-18 ASL9430 - Jul 18, 04:40 UTCJul 18, 06:05 UTC1h 25m
2026-07-17 ASL136 BEG → BEG Jul 17, 20:29 UTCJul 18, 03:10 UTC6h 41m
2026-07-17 ASL22Q TIV → BEG Jul 17, 17:40 UTCJul 17, 18:10 UTC30m
2026-07-17 ASL30D SKP → BEG Jul 17, 15:55 UTCJul 17, 16:15 UTC20m
2026-07-17 ASL73B TGD → BEG Jul 17, 13:35 UTCJul 17, 14:00 UTC25m
2026-07-17 ASL32A BEG → TIV Jul 17, 11:50 UTCJul 17, 12:15 UTC25m

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

Mode-S 4C01EE frequently asked

What is Mode-S code 4C01EE?
4C01EE is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-APO.
Where is Mode-S 4C01EE registered?
Mode-S code 4C01EE is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C01EE broadcasting right now?
Yes. Mode-S 4C01EE is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C01EE, octal 23000756, decimal 4,981,230.
What flights does 4C01EE operate?
Mode-S 4C01EE has broadcast 20 distinct callsigns, including ASL135, ASL136, ASL134, ASL132, ASL73B.