Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 Jul 26, 20:55 UTC
Flights observed
371
Distinct callsigns
20
Country
RS
Last broadcast
Jul 26, 20:55 UTC

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
ASL80A Spurling Aviation 13 2026-07-23
ASL44Q - 13 2026-07-23
ASL33J Spurling Aviation 12 2026-07-26
ASL47G Spurling Aviation 11 2026-07-25
ASL97E Spurling Aviation 10 2026-07-26
ASL77L - 10 2026-07-19
ASL77B - 10 2026-07-22
ASL72Q Spurling Aviation 10 2026-07-26
ASL61J Spurling Aviation 10 2026-07-22
ASL31Q - 10 2026-07-19
ASL74K - 9 2026-07-14
ASL40Y - 9 2026-07-14
ASL26X - 9 2026-07-19
ASL47P Spurling Aviation 8 2026-07-19
ASL45T Spurling Aviation 8 2026-07-25
ASL37Z - 8 2026-07-25
ASL95Q Spurling Aviation 7 2026-07-24
ASL73P Spurling Aviation 7 2026-07-06
ASL48G Spurling Aviation 7 2026-07-24
ASL34Q Spurling Aviation 7 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL68B BEG → PRG Jul 26, 19:25 UTCJul 26, 20:50 UTC1h 25m
2026-07-26 ASL79N BEG → VCE Jul 26, 16:20 UTCJul 26, 18:10 UTC1h 50m
2026-07-26 ASL97E BUD → BEG Jul 26, 13:30 UTCJul 26, 14:20 UTC50m
2026-07-26 ASL72Q BEG → BUD Jul 26, 11:40 UTCJul 26, 12:35 UTC55m
2026-07-26 ASL33J INI → BEG Jul 26, 02:00 UTCJul 26, 02:35 UTC35m
2026-07-25 ASL47G BEG → SKP Jul 25, 23:10 UTCJul 25, 23:45 UTC35m
2026-07-25 ASL37Z VIE → BEG Jul 25, 18:55 UTCJul 25, 20:00 UTC1h 5m
2026-07-25 ASL45T BEG → VIE Jul 25, 16:45 UTCJul 25, 18:05 UTC1h 20m
2026-07-25 ASL27L DBV → BEG Jul 25, 14:20 UTCJul 25, 14:35 UTC15m
2026-07-25 ASL27L DBV → BEG Jul 25, 13:35 UTCJul 25, 13:40 UTC5m
2026-07-25 ASL90A - Jul 25, 11:50 UTCJul 25, 12:40 UTC50m
2026-07-25 ASL52D VAR → BEG Jul 25, 01:35 UTCJul 25, 02:55 UTC1h 20m
2026-07-24 ASL70Z PRG → BEG Jul 24, 23:05 UTCJul 25, 00:30 UTC1h 25m
2026-07-24 ASL48G GOT → BEG Jul 24, 19:10 UTCJul 24, 20:50 UTC1h 40m
2026-07-24 ASL95Q BEG → BLQ Jul 24, 16:15 UTCJul 24, 18:00 UTC1h 45m
2026-07-24 ASL97E BUD → BEG Jul 24, 14:20 UTCJul 24, 15:10 UTC50m
2026-07-24 ASL72Q BEG → BUD Jul 24, 12:25 UTCJul 24, 13:15 UTC50m
2026-07-24 ASL12C BNX → BEG Jul 24, 09:55 UTCJul 24, 10:45 UTC50m
2026-07-24 ASL62B BEG → BNX Jul 24, 08:25 UTCJul 24, 08:50 UTC25m
2026-07-24 ASL45B IST → BEG Jul 24, 06:25 UTCJul 24, 07:20 UTC55m
2026-07-24 ASL92Z BEG → BRI Jul 24, 04:35 UTCJul 24, 05:20 UTC45m
2026-07-23 ASL51D ZAG → BEG Jul 23, 13:25 UTCJul 23, 14:20 UTC55m
2026-07-23 ASL30J - Jul 23, 11:40 UTCJul 23, 12:30 UTC50m
2026-07-23 ASL44Q VIE → BEG Jul 23, 07:40 UTCJul 23, 08:55 UTC1h 15m
2026-07-23 ASL80A BEG → CPH Jul 23, 05:30 UTCJul 23, 06:45 UTC1h 15m
2026-07-23 ASL74F OTP → BEG Jul 23, 01:30 UTCJul 23, 02:45 UTC1h 15m
2026-07-22 ASL38Z BEG → OTP Jul 22, 22:50 UTCJul 22, 23:55 UTC1h 5m
2026-07-22 ASL61J BEG → TIV Jul 22, 13:30 UTCJul 22, 14:40 UTC1h 10m
2026-07-22 ASL77B - Jul 22, 11:10 UTCJul 22, 12:10 UTC1h 0m
2026-07-21 ASL97E BUD → BEG Jul 21, 13:35 UTCJul 21, 14:25 UTC50m
2026-07-21 ASL72Q BEG → BUD Jul 21, 11:45 UTCJul 21, 12:40 UTC55m
2026-07-21 ASL44Q VIE → BEG Jul 21, 07:50 UTCJul 21, 08:50 UTC1h 0m
2026-07-21 ASL80A - Jul 21, 05:30 UTCJul 21, 06:50 UTC1h 20m
2026-07-20 ASL51D ZAG → BEG Jul 20, 13:40 UTCJul 20, 14:25 UTC45m
2026-07-20 ASL30J - Jul 20, 11:50 UTCJul 20, 12:45 UTC55m
2026-07-19 ASL77J FLR → BEG Jul 19, 19:10 UTCJul 19, 21:05 UTC1h 55m
2026-07-19 ASL48D LIS → BEG Jul 19, 16:05 UTCJul 19, 18:15 UTC2h 10m
2026-07-19 ASL47P SOF → BEG Jul 19, 13:25 UTCJul 19, 14:25 UTC1h 0m
2026-07-19 ASL26X - Jul 19, 11:25 UTCJul 19, 12:20 UTC55m
2026-07-19 ASL31Q - Jul 19, 07:35 UTCJul 19, 08:35 UTC1h 0m
2026-07-19 ASL77L BEG → LJU Jul 19, 05:25 UTCJul 19, 06:40 UTC1h 15m
2026-07-18 ASL97E BUD → BEG Jul 18, 13:50 UTCJul 18, 14:45 UTC55m
2026-07-18 ASL72Q BEG → BUD Jul 18, 12:00 UTCJul 18, 12:55 UTC55m
2026-07-18 ASL31Q - Jul 18, 07:45 UTCJul 18, 08:55 UTC1h 10m
2026-07-18 ASL77L - Jul 18, 05:30 UTCJul 18, 06:45 UTC1h 15m
2026-07-17 ASL157 - Jul 17, 07:25 UTCJul 17, 08:49 UTC1h 25m
2026-07-17 ASL156 BEG → KRK Jul 17, 04:39 UTCJul 17, 06:10 UTC1h 30m
2026-07-17 ASL74F - Jul 17, 01:29 UTCJul 17, 02:34 UTC1h 5m
2026-07-16 ASL38Z - Jul 16, 22:45 UTCJul 16, 23:49 UTC1h 5m
2026-07-16 ASL61J BEG → TIV Jul 16, 13:00 UTCJul 16, 14:10 UTC1h 10m

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 Jul 26, 20:55 UTC.
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 ASL80A, ASL44Q, ASL33J, ASL47G, ASL97E.