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 ASL423 · 32,000 ft
Flights observed
134
Distinct callsigns
20
Country
RS
Last broadcast
2h ago

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
ASL63H Spurling Aviation 7 2026-05-28
ASL51N Spurling Aviation 7 2026-05-28
ASL47E Spurling Aviation 7 2026-05-18
ASL136 Spurling Aviation 7 2026-05-17
ASL71H Spurling Aviation 6 2026-05-18
ASL132 Spurling Aviation 6 2026-05-20
ASL86T Spurling Aviation 4 2026-05-07
ASL71G Spurling Aviation 4 2026-05-07
ASL49U - 4 2026-05-24
ASL45X Spurling Aviation 4 2026-05-24
ASL134 Spurling Aviation 4 2026-05-28
ASL133 Spurling Aviation 4 2026-05-20
ASL57Z - 3 2026-05-18
ASL135 Spurling Aviation 3 2026-05-28
ASL91K Spurling Aviation 2 2026-05-24
ASL90M - 2 2026-05-10
ASL86W - 2 2026-04-17
ASL83Z - 2 2026-05-10
ASL73B Spurling Aviation 2 2026-04-29
ASL71A Spurling Aviation 2 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 ASL422 BEG → IST May 30, 11:40 UTCMay 30, 12:45 UTC1h 5m
2026-05-30 ASL427 IST → BEG May 30, 01:50 UTCMay 30, 03:05 UTC1h 15m
2026-05-29 ASL426 BEG → IST May 29, 23:05 UTCMay 30, 00:10 UTC1h 5m
2026-05-29 ASL17H LIS → BEG May 29, 16:00 UTCMay 29, 19:25 UTC3h 25m
2026-05-29 ASL53X BEG → LIS May 29, 10:40 UTCMay 29, 14:05 UTC3h 25m
2026-05-28 ASL135 SVO → BEG May 28, 23:05 UTCMay 28, 23:35 UTC30m
2026-05-28 ASL135 SVO → BEG May 28, 21:15 UTCMay 28, 21:40 UTC25m
2026-05-28 ASL134 BEG → SVO May 28, 17:15 UTCMay 28, 19:10 UTC1h 55m
2026-05-28 ASL51N BEG → BEG May 28, 08:20 UTCMay 28, 10:35 UTC2h 15m
2026-05-28 ASL63H BEG → ZRH May 28, 04:50 UTCMay 28, 07:00 UTC2h 10m
2026-05-26 ASL71A BEG → AMS May 26, 11:00 UTCMay 26, 13:45 UTC2h 45m
2026-05-26 ASL27E BEG → MAD May 26, 06:25 UTCMay 26, 09:04 UTC2h 40m
2026-05-25 ASL98C ZRH → BEG May 25, 19:10 UTCMay 25, 20:34 UTC1h 25m
2026-05-25 ASL90F BEG → ZRH May 25, 16:45 UTCMay 25, 18:15 UTC1h 30m
2026-05-25 ASL51N BEG → BEG May 25, 08:30 UTCMay 25, 10:45 UTC2h 15m
2026-05-25 ASL63H BEG → ZRH May 25, 04:55 UTCMay 25, 07:00 UTC2h 5m
2026-05-24 ASL45X CDG → BEG May 24, 19:05 UTCMay 24, 21:00 UTC1h 55m
2026-05-24 ASL49U - May 24, 15:35 UTCMay 24, 17:35 UTC2h 0m
2026-05-24 ASL91K TBS → BEG May 24, 13:30 UTCMay 24, 13:50 UTC20m
2026-05-24 ASL91K TBS → BEG May 24, 11:05 UTCMay 24, 12:00 UTC55m
2026-05-24 ASL95E BEG → TBS May 24, 06:40 UTCMay 24, 09:25 UTC2h 45m
2026-05-23 ASL44B - May 23, 11:30 UTCMay 23, 13:30 UTC2h 0m
2026-05-23 ASL35B - May 23, 08:00 UTCMay 23, 09:35 UTC1h 35m
2026-05-23 ASL84J LCA → BEG May 23, 02:25 UTCMay 23, 04:45 UTC2h 19m
2026-05-22 ASL68F CGN → INI May 22, 23:00 UTCMay 23, 01:10 UTC2h 10m
2026-05-22 ASL43N MXP → BEG May 22, 20:20 UTCMay 22, 21:40 UTC1h 20m
2026-05-22 ASL14G BEG → LHR May 22, 17:10 UTCMay 22, 18:40 UTC1h 30m
2026-05-21 ASL10A BEG → ZRH May 21, 14:40 UTCMay 21, 16:55 UTC2h 15m
2026-05-21 ASL12H BEG → LHR May 21, 09:55 UTCMay 21, 12:20 UTC2h 25m
2026-05-20 ASL133 SVO → BEG May 20, 18:55 UTCMay 20, 20:00 UTC1h 5m
2026-05-20 ASL132 BEG → SVO May 20, 13:05 UTCMay 20, 15:20 UTC2h 15m
2026-05-18 ASL47E LCA → BEG May 18, 15:20 UTCMay 18, 17:50 UTC2h 30m
2026-05-18 ASL71H BEG → LCA May 18, 12:05 UTCMay 18, 14:05 UTC2h 0m
2026-05-18 ASL57Z OSL → BEG May 18, 08:01 UTCMay 18, 10:30 UTC2h 30m
2026-05-18 ASL49G BEG → OSL May 18, 04:25 UTCMay 18, 06:55 UTC2h 30m
2026-05-17 ASL136 BEG → SVO May 17, 20:10 UTCMay 17, 22:10 UTC2h 0m
2026-05-17 ASL48X LCA → BEG May 17, 12:50 UTCMay 17, 15:25 UTC2h 35m
2026-05-17 ASL38M TGD → BEG May 17, 09:40 UTCMay 17, 11:35 UTC1h 55m
2026-05-16 ASL136 BEG → SVO May 16, 20:15 UTCMay 17, 08:00 UTC11h 45m
2026-05-15 ASL136 BEG → SVO May 15, 20:20 UTCMay 16, 03:30 UTC7h 10m
2026-05-15 ASL10A BEG → ZRH May 15, 12:50 UTCMay 15, 15:05 UTC2h 14m
2026-05-15 ASL12H BEG → LHR May 15, 08:40 UTCMay 15, 11:10 UTC2h 30m
2026-05-11 ASL47E LCA → BEG May 11, 15:20 UTCMay 11, 17:35 UTC2h 16m
2026-05-11 ASL71H BEG → LCA May 11, 12:00 UTCMay 11, 14:10 UTC2h 10m
2026-05-11 ASL51N BEG → BEG May 11, 08:45 UTCMay 11, 10:35 UTC1h 50m
2026-05-11 ASL63H BEG → ZRH May 11, 04:40 UTCMay 11, 07:25 UTC2h 45m
2026-05-10 ASL45X CDG → BEG May 10, 19:19 UTCMay 10, 21:19 UTC2h 0m
2026-05-10 ASL49U - May 10, 15:45 UTCMay 10, 17:55 UTC2h 10m
2026-05-10 ASL83Z - May 10, 11:35 UTCMay 10, 14:14 UTC2h 40m
2026-05-10 ASL90M - May 10, 06:40 UTCMay 10, 10:19 UTC3h 40m

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 ASL63H, ASL51N, ASL47E, ASL136, ASL71H.