Apparatus

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sensors Mode-S transponder

4C01F5

ICAO 24-bit transponder address · allocated to Serbia

Hex
4C01F5
Octal
23000765
Decimal
4,981,237
Country
RS
Broadcasting now · callsign ASL9139 · 32,000 ft
Flights observed
130
Distinct callsigns
20
Country
RS
Last broadcast
20d ago

Current position

4C01F5 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4C01F5 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
ASL9138 - 6 2026-07-26
ASL30L - 5 2026-07-19
ASL24M - 5 2026-07-19
ASL73B Spurling Aviation 4 2026-07-23
ASL32A Spurling Aviation 4 2026-07-23
ASL9139 - 3 2026-07-26
ASL75J Spurling Aviation 3 2026-07-25
ASL64X Spurling Aviation 3 2026-07-25
ASL30D Spurling Aviation 3 2026-07-19
ASL22Q Spurling Aviation 3 2026-07-19
ASL9977 - 2 2026-07-21
ASL9976 - 2 2026-07-21
ASL9530 - 2 2026-07-22
ASL9475 - 2 2026-07-22
ASL9474 - 2 2026-07-22
ASL93N - 2 2026-07-16
ASL71H - 2 2026-07-04
ASL64T Spurling Aviation 2 2026-07-26
ASL58C - 2 2026-07-16
ASL53X - 2 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL43N MXP → BEG Jul 26, 19:10 UTCJul 26, 20:30 UTC1h 20m
2026-07-26 ASL14G BEG → LHR Jul 26, 16:35 UTCJul 26, 18:00 UTC1h 25m
2026-07-26 ASL64T SKG → BEG Jul 26, 14:10 UTCJul 26, 15:00 UTC50m
2026-07-26 ASL46G BEG → BRU Jul 26, 12:05 UTCJul 26, 12:55 UTC50m
2026-07-26 ASL9139 - Jul 26, 07:50 UTCJul 26, 09:35 UTC1h 45m
2026-07-26 ASL9138 - Jul 26, 06:15 UTCJul 26, 06:30 UTC15m
2026-07-26 ASL9138 - Jul 26, 03:45 UTCJul 26, 05:05 UTC1h 20m
2026-07-25 ASL75J SOF → BEG Jul 25, 18:50 UTCJul 25, 19:00 UTC10m
2026-07-25 ASL64X PRG → BEG Jul 25, 16:50 UTCJul 25, 17:05 UTC15m
2026-07-25 ASL95T PMO → BEG Jul 25, 14:05 UTCJul 25, 15:30 UTC1h 25m
2026-07-25 ASL15F BEG → PMO Jul 25, 11:20 UTCJul 25, 12:35 UTC1h 15m
2026-07-25 ASL44B - Jul 25, 08:05 UTCJul 25, 10:00 UTC1h 55m
2026-07-25 ASL35B - Jul 25, 03:25 UTCJul 25, 05:05 UTC1h 40m
2026-07-24 ASL64A BRU → BEG Jul 24, 20:15 UTCJul 24, 22:25 UTC2h 10m
2026-07-24 ASL72D FRA → BEG Jul 24, 16:25 UTCJul 24, 19:10 UTC2h 45m
2026-07-23 ASL85L STR → BEG Jul 23, 20:05 UTCJul 23, 22:05 UTC2h 0m
2026-07-23 ASL23Z BEG → PMI Jul 23, 16:15 UTCJul 23, 18:40 UTC2h 25m
2026-07-23 ASL73B TGD → BEG Jul 23, 14:40 UTCJul 23, 15:05 UTC25m
2026-07-23 ASL32A BEG → TIV Jul 23, 12:45 UTCJul 23, 13:05 UTC20m
2026-07-23 ASL51N BEG → BEG Jul 23, 09:10 UTCJul 23, 11:25 UTC2h 15m
2026-07-23 ASL63H BEG → ZRH Jul 23, 04:55 UTCJul 23, 07:20 UTC2h 25m
2026-07-22 ASL9475 - Jul 22, 19:50 UTCJul 22, 21:30 UTC1h 40m
2026-07-22 ASL9474 - Jul 22, 16:45 UTCJul 22, 18:20 UTC1h 35m
2026-07-22 ASL73B TGD → BEG Jul 22, 13:50 UTCJul 22, 14:25 UTC35m
2026-07-22 ASL32A BEG → TIV Jul 22, 12:00 UTCJul 22, 12:20 UTC20m
2026-07-22 ASL9530 - Jul 22, 04:15 UTCJul 22, 05:25 UTC1h 10m
2026-07-21 ASL9977 - Jul 21, 19:55 UTCJul 21, 21:35 UTC1h 40m
2026-07-21 ASL9976 - Jul 21, 16:40 UTCJul 21, 18:20 UTC1h 40m
2026-07-21 ASL73B TGD → BEG Jul 21, 14:10 UTCJul 21, 14:35 UTC25m
2026-07-21 ASL32A BEG → TIV Jul 21, 12:15 UTCJul 21, 12:45 UTC30m
2026-07-21 ASL89A - Jul 21, 06:45 UTCJul 21, 08:45 UTC2h 0m
2026-07-21 ASL37E BEG → AYT Jul 21, 03:15 UTCJul 21, 05:00 UTC1h 45m
2026-07-20 ASL75L - Jul 20, 20:10 UTCJul 20, 22:35 UTC2h 25m
2026-07-20 ASL70X BEG → ALC Jul 20, 15:40 UTCJul 20, 18:40 UTC3h 0m
2026-07-20 ASL64T SKG → BEG Jul 20, 13:30 UTCJul 20, 14:25 UTC55m
2026-07-20 ASL46G BEG → SKG Jul 20, 11:45 UTCJul 20, 12:35 UTC50m
2026-07-20 ASL46T - Jul 20, 07:15 UTCJul 20, 09:05 UTC1h 50m
2026-07-20 ASL60Q BEG → AYT Jul 20, 03:40 UTCJul 20, 05:25 UTC1h 45m
2026-07-19 ASL30L - Jul 19, 22:00 UTCJul 19, 23:00 UTC1h 0m
2026-07-19 ASL24M - Jul 19, 19:25 UTCJul 19, 19:50 UTC25m
2026-07-19 ASL22Q TIV → BEG Jul 19, 17:30 UTCJul 19, 18:10 UTC40m
2026-07-19 ASL30D SKP → BEG Jul 19, 15:35 UTCJul 19, 16:05 UTC30m
2026-07-19 ASL37R - Jul 19, 13:40 UTCJul 19, 14:05 UTC25m
2026-07-19 ASL93X - Jul 19, 11:45 UTCJul 19, 12:05 UTC20m
2026-07-19 ASL9139 - Jul 19, 07:30 UTCJul 19, 09:05 UTC1h 35m
2026-07-19 ASL9138 - Jul 19, 06:05 UTCJul 19, 06:20 UTC15m
2026-07-19 ASL9138 - Jul 19, 03:35 UTCJul 19, 05:00 UTC1h 25m
2026-07-18 ASL9471 - Jul 18, 20:50 UTCJul 18, 22:25 UTC1h 35m
2026-07-18 ASL9472 - Jul 18, 17:55 UTCJul 18, 19:30 UTC1h 35m
2026-07-18 ASL9473 - Jul 18, 14:35 UTCJul 18, 16:15 UTC1h 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.

Mode-S 4C01F5 frequently asked

What is Mode-S code 4C01F5?
4C01F5 is an ICAO 24-bit transponder address. Allocated to Serbia.
Where is Mode-S 4C01F5 registered?
Mode-S code 4C01F5 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C01F5 broadcasting right now?
Yes. Mode-S 4C01F5 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C01F5, octal 23000765, decimal 4,981,237.
What flights does 4C01F5 operate?
Mode-S 4C01F5 has broadcast 20 distinct callsigns, including ASL9138, ASL30L, ASL24M, ASL73B, ASL32A.