Apparatus

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sensors Mode-S transponder

4C0261

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-ATB · EMBRAER ERJ-190-200

Hex
4C0261
Octal
23001141
Decimal
4,981,345
Country
RS
Tail
YU-ATB
Type
E195
Broadcasting now · callsign ASL79H · 30,000 ft
Flights observed
406
Distinct callsigns
20
Country
RS
Last broadcast
Jul 25, 19:05 UTC

Current position

4C0261 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4C0261 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
ASL90A - 16 2026-07-24
ASL27L Spurling Aviation 16 2026-07-24
ASL30R - 12 2026-07-24
ASL84D - 11 2026-07-13
ASL79H Spurling Aviation 11 2026-07-24
ASL81C Spurling Aviation 10 2026-07-25
ASL49H Spurling Aviation 10 2026-07-25
ASL54C - 9 2026-07-25
ASL44R - 9 2026-07-13
ASL20T - 9 2026-07-02
ASL18A Spurling Aviation 9 2026-07-25
ASL88G - 8 2026-07-01
ASL75K - 8 2026-07-02
ASL43N - 8 2026-07-16
ASL14G Spurling Aviation 8 2026-07-16
ASL96C - 7 2026-07-12
ASL89B - 7 2026-07-12
ASL82X - 7 2026-07-01
ASL78P Spurling Aviation 7 2026-07-14
ASL64T Spurling Aviation 7 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 ASL49H ZRH → BEG Jul 25, 18:45 UTCJul 25, 19:05 UTC20m
2026-07-25 ASL81C BEG → SJJ Jul 25, 12:15 UTCJul 25, 12:35 UTC20m
2026-07-25 ASL18A AMS → AMS Jul 25, 08:30 UTCJul 25, 10:15 UTC1h 45m
2026-07-25 ASL54C - Jul 25, 04:40 UTCJul 25, 06:30 UTC1h 50m
2026-07-24 ASL343 MUC → BEG Jul 24, 18:55 UTCJul 24, 20:00 UTC1h 5m
2026-07-24 ASL342 BEG → MUC Jul 24, 16:20 UTCJul 24, 17:40 UTC1h 20m
2026-07-24 ASL27L DBV → BEG Jul 24, 14:10 UTCJul 24, 14:55 UTC45m
2026-07-24 ASL90A BEG → DBV Jul 24, 12:30 UTCJul 24, 13:10 UTC40m
2026-07-24 ASL30R FRA → BEG Jul 24, 09:35 UTCJul 24, 11:15 UTC1h 40m
2026-07-24 ASL79H INI → BEG Jul 24, 05:30 UTCJul 24, 07:15 UTC1h 45m
2026-07-23 ASL49H ZRH → BEG Jul 23, 14:40 UTCJul 23, 15:10 UTC30m
2026-07-23 ASL81C BEG → SJJ Jul 23, 13:05 UTCJul 23, 13:30 UTC25m
2026-07-23 ASL99L - Jul 23, 11:25 UTCJul 23, 11:50 UTC25m
2026-07-23 ASL52N BEG → TIV Jul 23, 09:15 UTCJul 23, 09:35 UTC20m
2026-07-21 ASL20K AMS → BEG Jul 21, 08:00 UTCJul 21, 09:05 UTC1h 5m
2026-07-21 ASL42A BEG → FCO Jul 21, 05:15 UTCJul 21, 06:30 UTC1h 15m
2026-07-18 ASL96D ATH → BEG Jul 18, 15:20 UTCJul 18, 16:35 UTC1h 15m
2026-07-18 ASL64R BEG → ATH Jul 18, 11:50 UTCJul 18, 13:10 UTC1h 20m
2026-07-18 ASL341 MUC → BEG Jul 18, 08:05 UTCJul 18, 09:15 UTC1h 10m
2026-07-18 ASL340 BEG → MUC Jul 18, 05:35 UTCJul 18, 06:55 UTC1h 20m
2026-07-17 ASL16J CPH → BEG Jul 17, 19:25 UTCJul 17, 21:20 UTC1h 55m
2026-07-17 ASL19H BEG → CPH Jul 17, 16:10 UTCJul 17, 18:00 UTC1h 50m
2026-07-17 ASL64T SKG → BEG Jul 17, 13:55 UTCJul 17, 14:55 UTC1h 0m
2026-07-17 ASL46G BEG → SKG Jul 17, 12:04 UTCJul 17, 12:55 UTC50m
2026-07-17 ASL30R FRA → BEG Jul 17, 08:25 UTCJul 17, 09:50 UTC1h 25m
2026-07-17 ASL79H BEG → FRA Jul 17, 05:15 UTCJul 17, 07:05 UTC1h 50m
2026-07-16 ASL43N MXP → BEG Jul 16, 19:14 UTCJul 16, 20:29 UTC1h 15m
2026-07-16 ASL14G BEG → LHR Jul 16, 16:30 UTCJul 16, 17:54 UTC1h 25m
2026-07-16 ASL66M - Jul 16, 13:34 UTCJul 16, 15:05 UTC1h 30m
2026-07-16 ASL40E - Jul 16, 10:59 UTCJul 16, 12:25 UTC1h 25m
2026-07-16 ASL341 MUC → BEG Jul 16, 08:00 UTCJul 16, 09:10 UTC1h 10m
2026-07-16 ASL340 BEG → MUC Jul 16, 05:20 UTCJul 16, 06:35 UTC1h 15m
2026-07-15 ASL343 MUC → BEG Jul 15, 20:40 UTCJul 15, 21:45 UTC1h 5m
2026-07-15 ASL342 BEG → MUC Jul 15, 16:55 UTCJul 15, 18:10 UTC1h 15m
2026-07-15 ASL53E ZRH → BEG Jul 15, 13:20 UTCJul 15, 14:40 UTC1h 20m
2026-07-15 ASL27D BEG → ZRH Jul 15, 10:30 UTCJul 15, 12:10 UTC1h 40m
2026-07-15 ASL16G MXP → BEG Jul 15, 07:50 UTCJul 15, 09:05 UTC1h 15m
2026-07-15 ASL58V BEG → MXP Jul 15, 05:00 UTCJul 15, 06:25 UTC1h 25m
2026-07-14 ASL64P BEG → CPH Jul 14, 18:55 UTCJul 14, 20:40 UTC1h 45m
2026-07-14 ASL78P BEG → CHQ Jul 14, 15:50 UTCJul 14, 17:55 UTC2h 5m
2026-07-14 ASL87Q SKP → BEG Jul 14, 13:35 UTCJul 14, 14:10 UTC35m
2026-07-14 ASL56C FCO → BEG Jul 14, 11:25 UTCJul 14, 11:55 UTC30m
2026-07-14 ASL341 - Jul 14, 08:00 UTCJul 14, 09:05 UTC1h 5m
2026-07-14 ASL340 BEG → MUC Jul 14, 05:30 UTCJul 14, 06:45 UTC1h 15m
2026-07-13 ASL49H ZRH → BEG Jul 13, 14:00 UTCJul 13, 14:30 UTC30m
2026-07-13 ASL81C BEG → SJJ Jul 13, 12:40 UTCJul 13, 13:00 UTC20m
2026-07-13 ASL84D - Jul 13, 07:40 UTCJul 13, 09:40 UTC2h 0m
2026-07-13 ASL44R BEG → HAM Jul 13, 04:40 UTCJul 13, 06:30 UTC1h 50m
2026-07-12 ASL20A BEG → TBS Jul 12, 19:30 UTCJul 12, 21:05 UTC1h 35m
2026-07-12 ASL58F BEG → AGP Jul 12, 16:45 UTCJul 12, 18:35 UTC1h 50m

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

Mode-S 4C0261 frequently asked

What is Mode-S code 4C0261?
4C0261 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-ATB.
Where is Mode-S 4C0261 registered?
Mode-S code 4C0261 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C0261 broadcasting right now?
Yes. Mode-S 4C0261 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C0261, octal 23001141, decimal 4,981,345.
What flights does 4C0261 operate?
Mode-S 4C0261 has broadcast 20 distinct callsigns, including ASL90A, ASL27L, ASL30R, ASL84D, ASL79H.