Apparatus

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sensors Mode-S transponder

4C0245

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-ASF · ATR-72-600

Hex
4C0245
Octal
23001105
Decimal
4,981,317
Country
RS
Tail
YU-ASF
Type
AT76
No current signal · last broadcast 1d ago
Flights observed
116
Distinct callsigns
20
Country
RS
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4C0245.

Country allocation

The ICAO 24-bit address 4C0245 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
ASL47F Spurling Aviation 5 2026-05-18
ASL26X Spurling Aviation 5 2026-05-16
ASL89R Spurling Aviation 4 2026-05-18
ASL79Y Spurling Aviation 4 2026-05-19
ASL47P Spurling Aviation 4 2026-05-16
ASL36Q - 4 2026-05-18
ASL33K Spurling Aviation 4 2026-05-19
ASL33J Spurling Aviation 4 2026-05-18
ASL97E Spurling Aviation 3 2026-05-18
ASL80A Spurling Aviation 3 2026-05-19
ASL77W - 3 2026-05-18
ASL77L Spurling Aviation 3 2026-05-17
ASL72Q Spurling Aviation 3 2026-05-18
ASL47G Spurling Aviation 3 2026-05-17
ASL45T Spurling Aviation 3 2026-05-09
ASL44Q Spurling Aviation 3 2026-05-19
ASL37Z Spurling Aviation 3 2026-05-09
ASL31Q Spurling Aviation 3 2026-05-17
ASL96B Spurling Aviation 2 2026-05-29
ASL95Q Spurling Aviation 2 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 ASL96B BEG → BLQ May 29, 02:15 UTCMay 29, 03:10 UTC55m
2026-05-28 ASL59D BEG → TIA May 28, 22:55 UTCMay 28, 23:40 UTC45m
2026-05-19 ASL33K SKP → BEG May 19, 13:45 UTCMay 19, 14:20 UTC35m
2026-05-19 ASL79Y VIE → BEG May 19, 11:40 UTCMay 19, 12:20 UTC40m
2026-05-19 ASL44Q VIE → BEG May 19, 07:40 UTCMay 19, 08:50 UTC1h 10m
2026-05-19 ASL80A BEG → CPH May 19, 05:35 UTCMay 19, 06:50 UTC1h 15m
2026-05-18 ASL47F PRG → BEG May 18, 18:55 UTCMay 18, 20:35 UTC1h 40m
2026-05-18 ASL89R BEG → PRG May 18, 16:05 UTCMay 18, 17:50 UTC1h 45m
2026-05-18 ASL97E BUD → BEG May 18, 13:35 UTCMay 18, 14:30 UTC55m
2026-05-18 ASL72Q BEG → BUD May 18, 11:40 UTCMay 18, 12:25 UTC45m
2026-05-18 ASL77W - May 18, 07:50 UTCMay 18, 09:25 UTC1h 35m
2026-05-18 ASL36Q - May 18, 05:05 UTCMay 18, 06:40 UTC1h 35m
2026-05-18 ASL33J INI → BEG May 18, 02:15 UTCMay 18, 02:50 UTC35m
2026-05-17 ASL47G BEG → SKP May 17, 23:10 UTCMay 17, 23:50 UTC40m
2026-05-17 ASL48G GOT → BEG May 17, 18:35 UTCMay 17, 20:10 UTC1h 35m
2026-05-17 ASL95Q BEG → BLQ May 17, 15:35 UTCMay 17, 17:25 UTC1h 50m
2026-05-17 ASL51D ZAG → BEG May 17, 13:15 UTCMay 17, 14:15 UTC1h 0m
2026-05-17 ASL30J BEG → ZAG May 17, 11:25 UTCMay 17, 12:15 UTC50m
2026-05-17 ASL31Q LJU → BEG May 17, 07:25 UTCMay 17, 08:35 UTC1h 10m
2026-05-17 ASL77L BEG → AMS May 17, 05:30 UTCMay 17, 06:30 UTC1h 0m
2026-05-16 ASL47P SOF → BEG May 16, 18:00 UTCMay 16, 18:30 UTC30m
2026-05-16 ASL26X BEG → SOF May 16, 16:00 UTCMay 16, 16:40 UTC40m
2026-05-16 ASL26X BEG → SOF May 16, 11:35 UTCMay 16, 13:11 UTC1h 35m
2026-05-12 ASL64T SKG → BEG May 12, 14:35 UTCMay 12, 15:55 UTC1h 20m
2026-05-12 ASL46G BEG → BRU May 12, 11:35 UTCMay 12, 13:30 UTC1h 55m
2026-05-11 ASL77W - May 11, 07:25 UTCMay 11, 08:45 UTC1h 20m
2026-05-11 ASL36Q - May 11, 04:40 UTCMay 11, 06:20 UTC1h 40m
2026-05-11 ASL74F OTP → BEG May 11, 01:45 UTCMay 11, 03:00 UTC1h 15m
2026-05-10 ASL38Z BEG → OTP May 10, 22:40 UTCMay 10, 23:39 UTC1h 0m
2026-05-10 ASL68B BEG → PRG May 10, 19:00 UTCMay 10, 20:25 UTC1h 25m
2026-05-10 ASL79N BEG → VCE May 10, 16:14 UTCMay 10, 17:49 UTC1h 35m
2026-05-10 ASL47P SOF → BEG May 10, 13:44 UTCMay 10, 14:25 UTC40m
2026-05-10 ASL26X BEG → SOF May 10, 11:45 UTCMay 10, 12:19 UTC35m
2026-05-09 ASL37Z VIE → BEG May 9, 18:50 UTCMay 9, 19:55 UTC1h 5m
2026-05-09 ASL45T BEG → VIE May 9, 16:40 UTCMay 9, 17:45 UTC1h 5m
2026-05-09 ASL34Q BEG → BER May 9, 13:15 UTCMay 9, 14:25 UTC1h 10m
2026-05-09 ASL73P VCE → BEG May 9, 11:20 UTCMay 9, 12:30 UTC1h 10m
2026-05-09 ASL78U PRG → BEG May 9, 07:30 UTCMay 9, 09:20 UTC1h 50m
2026-05-09 ASL18R BEG → PRG May 9, 04:40 UTCMay 9, 06:20 UTC1h 40m
2026-05-08 ASL61J BEG → TIV May 8, 12:49 UTCMay 8, 13:55 UTC1h 5m
2026-05-08 ASL77B BEG → BRU May 8, 10:49 UTCMay 8, 12:00 UTC1h 10m
2026-05-08 ASL31Q LJU → BEG May 8, 07:24 UTCMay 8, 08:29 UTC1h 5m
2026-05-08 ASL77L BEG → AMS May 8, 05:24 UTCMay 8, 06:30 UTC1h 5m
2026-05-07 ASL10Q BEG → CTA May 7, 09:30 UTCMay 7, 10:20 UTC50m
2026-05-07 ASL34H MAD → BEG May 7, 07:45 UTCMay 7, 08:40 UTC55m
2026-05-05 ASL97E BUD → BEG May 5, 13:25 UTCMay 5, 14:15 UTC50m
2026-05-05 ASL72Q BEG → BUD May 5, 11:40 UTCMay 5, 12:30 UTC50m
2026-05-04 ASL47F PRG → BEG May 4, 18:40 UTCMay 4, 20:20 UTC1h 40m
2026-05-04 ASL89R BEG → PRG May 4, 16:10 UTCMay 4, 17:50 UTC1h 40m
2026-05-04 ASL47P SOF → BEG May 4, 13:30 UTCMay 4, 14:00 UTC30m

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

Mode-S 4C0245 frequently asked

What is Mode-S code 4C0245?
4C0245 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-ASF.
Where is Mode-S 4C0245 registered?
Mode-S code 4C0245 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C0245 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C0245, octal 23001105, decimal 4,981,317.
What flights does 4C0245 operate?
Mode-S 4C0245 has broadcast 20 distinct callsigns, including ASL47F, ASL26X, ASL89R, ASL79Y, ASL47P.