Apparatus

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sensors Mode-S transponder

4C0244

ICAO 24-bit transponder address · allocated to Serbia

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

Hex
4C0244
Octal
23001104
Decimal
4,981,316
Country
RS
Tail
YU-ASE
Type
AT76
No current signal · last broadcast Jul 26, 19:50 UTC
Flights observed
511
Distinct callsigns
20
Country
RS
Last broadcast
Jul 26, 19:50 UTC

Last known position

Most recent position reported by Mode-S 4C0244.

Country allocation

The ICAO 24-bit address 4C0244 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
ASL45T Spurling Aviation 15 2026-07-23
ASL37Z - 15 2026-07-23
ASL80A Spurling Aviation 14 2026-07-25
ASL44Q Spurling Aviation 14 2026-07-25
ASL97E Spurling Aviation 13 2026-07-20
ASL77B Spurling Aviation 13 2026-07-26
ASL74F Spurling Aviation 13 2026-07-25
ASL72Q - 13 2026-07-20
ASL61J Spurling Aviation 13 2026-07-26
ASL38Z Spurling Aviation 13 2026-07-24
ASL92Z - 12 2026-07-21
ASL45B - 12 2026-07-21
ASL47P Spurling Aviation 11 2026-07-24
ASL26X - 11 2026-07-24
ASL96B - 10 2026-07-22
ASL79Y - 10 2026-07-03
ASL73P Spurling Aviation 10 2026-07-25
ASL34Q Spurling Aviation 10 2026-07-25
ASL33K Spurling Aviation 10 2026-07-03
ASL59D - 9 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL10N LJU → BEG Jul 26, 18:45 UTCJul 26, 19:50 UTC1h 5m
2026-07-26 ASL72L BEG → TIA Jul 26, 16:45 UTCJul 26, 17:55 UTC1h 10m
2026-07-26 ASL61J BEG → TIV Jul 26, 12:55 UTCJul 26, 14:05 UTC1h 10m
2026-07-26 ASL77B BEG → BRU Jul 26, 10:40 UTCJul 26, 12:00 UTC1h 20m
2026-07-25 ASL34Q BEG → BER Jul 25, 13:50 UTCJul 25, 14:50 UTC1h 0m
2026-07-25 ASL73P VCE → BEG Jul 25, 11:40 UTCJul 25, 12:55 UTC1h 15m
2026-07-25 ASL44Q VIE → BEG Jul 25, 08:20 UTCJul 25, 09:25 UTC1h 5m
2026-07-25 ASL80A BEG → CPH Jul 25, 05:40 UTCJul 25, 06:55 UTC1h 15m
2026-07-25 ASL74F OTP → BEG Jul 25, 01:30 UTCJul 25, 02:35 UTC1h 5m
2026-07-24 ASL38Z BEG → OTP Jul 24, 23:25 UTCJul 25, 00:25 UTC1h 0m
2026-07-24 ASL68B VCE → BEG Jul 24, 19:00 UTCJul 24, 20:25 UTC1h 25m
2026-07-24 ASL79N BEG → VCE Jul 24, 16:05 UTCJul 24, 17:40 UTC1h 35m
2026-07-24 ASL47P SOF → BEG Jul 24, 13:55 UTCJul 24, 14:50 UTC55m
2026-07-24 ASL26X BEG → SOF Jul 24, 12:15 UTCJul 24, 13:15 UTC1h 0m
2026-07-23 ASL37Z VIE → BEG Jul 23, 18:55 UTCJul 23, 19:55 UTC1h 0m
2026-07-23 ASL45T BEG → VIE Jul 23, 16:45 UTCJul 23, 18:00 UTC1h 15m
2026-07-23 ASL47P SOF → BEG Jul 23, 13:20 UTCJul 23, 14:10 UTC50m
2026-07-23 ASL26X BEG → SOF Jul 23, 11:35 UTCJul 23, 12:35 UTC1h 0m
2026-07-23 ASL77W - Jul 23, 07:35 UTCJul 23, 09:00 UTC1h 25m
2026-07-23 ASL36Q BEG → VCE Jul 23, 04:45 UTCJul 23, 06:30 UTC1h 45m
2026-07-23 ASL68A SOF → BEG Jul 23, 02:05 UTCJul 23, 03:05 UTC1h 0m
2026-07-22 ASL15J BEG → SOF Jul 22, 22:50 UTCJul 22, 23:40 UTC50m
2026-07-22 ASL96B - Jul 22, 02:30 UTCJul 22, 03:10 UTC40m
2026-07-21 ASL59D - Jul 21, 23:45 UTCJul 22, 00:30 UTC45m
2026-07-21 ASL37Z VIE → BEG Jul 21, 18:50 UTCJul 21, 19:55 UTC1h 5m
2026-07-21 ASL45T BEG → VIE Jul 21, 16:40 UTCJul 21, 17:50 UTC1h 10m
2026-07-21 ASL40Y - Jul 21, 14:00 UTCJul 21, 15:05 UTC1h 5m
2026-07-21 ASL74K - Jul 21, 11:45 UTCJul 21, 13:10 UTC1h 25m
2026-07-21 ASL45B - Jul 21, 07:55 UTCJul 21, 08:40 UTC45m
2026-07-21 ASL92Z - Jul 21, 05:55 UTCJul 21, 06:55 UTC1h 0m
2026-07-20 ASL37Z VIE → BEG Jul 20, 18:50 UTCJul 20, 19:55 UTC1h 5m
2026-07-20 ASL45T BEG → VIE Jul 20, 16:45 UTCJul 20, 18:00 UTC1h 15m
2026-07-20 ASL97E BUD → BEG Jul 20, 13:55 UTCJul 20, 14:45 UTC50m
2026-07-20 ASL72Q BEG → BUD Jul 20, 12:15 UTCJul 20, 13:00 UTC45m
2026-07-20 ASL157 KRK → BEG Jul 20, 07:45 UTCJul 20, 09:15 UTC1h 30m
2026-07-20 ASL156 BEG → KRK Jul 20, 04:50 UTCJul 20, 06:20 UTC1h 30m
2026-07-20 ASL74F OTP → BEG Jul 20, 01:50 UTCJul 20, 03:00 UTC1h 10m
2026-07-19 ASL38Z BEG → OTP Jul 19, 23:45 UTCJul 20, 00:55 UTC1h 10m
2026-07-19 ASL159 KRK → BEG Jul 19, 19:25 UTCJul 19, 20:55 UTC1h 30m
2026-07-19 ASL158 BEG → KRK Jul 19, 16:40 UTCJul 19, 18:10 UTC1h 30m
2026-07-19 ASL34Q BEG → BER Jul 19, 13:10 UTCJul 19, 14:20 UTC1h 10m
2026-07-19 ASL73P VCE → BEG Jul 19, 11:10 UTCJul 19, 12:25 UTC1h 15m
2026-07-18 ASL47P SOF → BEG Jul 18, 14:20 UTCJul 18, 15:15 UTC55m
2026-07-18 ASL26X - Jul 18, 12:15 UTCJul 18, 13:15 UTC1h 0m
2026-07-18 ASL45B - Jul 18, 08:20 UTCJul 18, 09:10 UTC50m
2026-07-18 ASL92Z - Jul 18, 06:10 UTCJul 18, 07:05 UTC55m
2026-07-16 ASL45B - Jul 16, 07:50 UTCJul 16, 08:45 UTC55m
2026-07-16 ASL92Z - Jul 16, 05:55 UTCJul 16, 06:40 UTC45m
2026-07-12 ASL47F PRG → BEG Jul 12, 19:05 UTCJul 12, 20:40 UTC1h 35m
2026-07-12 ASL89R BEG → PRG Jul 12, 16:15 UTCJul 12, 18:10 UTC1h 55m

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

Mode-S 4C0244 frequently asked

What is Mode-S code 4C0244?
4C0244 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-ASE.
Where is Mode-S 4C0244 registered?
Mode-S code 4C0244 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C0244 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C0244, octal 23001104, decimal 4,981,316.
What flights does 4C0244 operate?
Mode-S 4C0244 has broadcast 20 distinct callsigns, including ASL45T, ASL37Z, ASL80A, ASL44Q, ASL97E.