Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign ASL73P · 3,850 ft
Flights observed
247
Distinct callsigns
20
Country
RS
Last broadcast
3h ago

Current position

4C0244 is currently broadcasting. Map zoomed to live position.

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
ASL96B Spurling Aviation 8 2026-05-30
ASL79Y Spurling Aviation 8 2026-05-24
ASL45T Spurling Aviation 8 2026-05-25
ASL37Z Spurling Aviation 8 2026-05-25
ASL33K Spurling Aviation 8 2026-05-24
ASL80A Spurling Aviation 7 2026-05-27
ASL59D Spurling Aviation 7 2026-05-29
ASL44Q Spurling Aviation 7 2026-05-27
ASL80M Spurling Aviation 6 2026-05-29
ASL97E Spurling Aviation 5 2026-05-27
ASL77B Spurling Aviation 5 2026-05-23
ASL72Q Spurling Aviation 5 2026-05-27
ASL61J Spurling Aviation 5 2026-05-23
ASL49H Spurling Aviation 5 2026-05-05
ASL47P Spurling Aviation 5 2026-05-29
ASL26X Spurling Aviation 5 2026-05-29
ASL24C Spurling Aviation 5 2026-05-29
ASL93T Spurling Aviation 4 2026-05-23
ASL92Z Spurling Aviation 4 2026-05-22
ASL81C Spurling Aviation 4 2026-05-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 ASL78U PRG → BEG May 30, 07:40 UTCMay 30, 09:25 UTC1h 45m
2026-05-30 ASL18R BEG → PRG May 30, 04:45 UTCMay 30, 06:45 UTC2h 0m
2026-05-30 ASL96B BEG → BLQ May 30, 02:15 UTCMay 30, 03:10 UTC55m
2026-05-29 ASL59D BEG → TIA May 29, 23:00 UTCMay 29, 23:35 UTC35m
2026-05-29 ASL80M BRI → BEG May 29, 18:25 UTCMay 29, 19:50 UTC1h 25m
2026-05-29 ASL24C BEG → BRI May 29, 16:20 UTCMay 29, 17:30 UTC1h 10m
2026-05-29 ASL47P SOF → BEG May 29, 13:25 UTCMay 29, 14:20 UTC55m
2026-05-29 ASL26X BEG → SOF May 29, 11:25 UTCMay 29, 12:15 UTC50m
2026-05-29 ASL86N ZRH → BEG May 29, 07:30 UTCMay 29, 09:05 UTC1h 35m
2026-05-29 ASL22F BEG → SZG May 29, 04:55 UTCMay 29, 06:35 UTC1h 40m
2026-05-29 ASL33J INI → BEG May 29, 02:20 UTCMay 29, 03:00 UTC40m
2026-05-28 ASL47G BEG → SKP May 28, 23:05 UTCMay 28, 23:40 UTC35m
2026-05-28 ASL32P BEG → LCA May 28, 13:50 UTCMay 28, 14:55 UTC1h 5m
2026-05-28 ASL38Y - May 28, 11:45 UTCMay 28, 12:45 UTC1h 0m
2026-05-28 ASL10Q BEG → CTA May 28, 09:45 UTCMay 28, 10:35 UTC50m
2026-05-28 ASL34H MAD → BEG May 28, 07:55 UTCMay 28, 08:50 UTC55m
2026-05-28 ASL96B BEG → BLQ May 28, 02:00 UTCMay 28, 02:55 UTC55m
2026-05-27 ASL59D BEG → TIA May 27, 23:00 UTCMay 27, 23:35 UTC35m
2026-05-27 ASL97E BUD → BEG May 27, 13:25 UTCMay 27, 14:20 UTC55m
2026-05-27 ASL72Q BEG → BUD May 27, 11:40 UTCMay 27, 12:40 UTC1h 0m
2026-05-27 ASL44Q VIE → BEG May 27, 07:35 UTCMay 27, 08:35 UTC1h 0m
2026-05-27 ASL80A BEG → CPH May 27, 05:35 UTCMay 27, 06:40 UTC1h 5m
2026-05-25 ASL37Z VIE → BEG May 25, 18:50 UTCMay 25, 19:54 UTC1h 4m
2026-05-25 ASL45T BEG → VIE May 25, 16:50 UTCMay 25, 18:05 UTC1h 15m
2026-05-25 ASL34Q BEG → BER May 25, 13:35 UTCMay 25, 14:55 UTC1h 20m
2026-05-25 ASL73P VCE → BEG May 25, 11:35 UTCMay 25, 12:40 UTC1h 5m
2026-05-25 ASL87F BLQ → BEG May 25, 07:40 UTCMay 25, 09:25 UTC1h 45m
2026-05-25 ASL89C BEG → BLQ May 25, 04:40 UTCMay 25, 06:20 UTC1h 40m
2026-05-25 ASL74F OTP → BEG May 25, 01:55 UTCMay 25, 02:40 UTC45m
2026-05-24 ASL38Z BEG → OTP May 24, 23:00 UTCMay 24, 23:46 UTC46m
2026-05-24 ASL37Z VIE → BEG May 24, 18:45 UTCMay 24, 19:50 UTC1h 5m
2026-05-24 ASL45T BEG → VIE May 24, 16:45 UTCMay 24, 17:55 UTC1h 10m
2026-05-24 ASL33K SKP → BEG May 24, 14:10 UTCMay 24, 14:45 UTC35m
2026-05-24 ASL79Y VIE → BEG May 24, 11:40 UTCMay 24, 12:20 UTC40m
2026-05-24 ASL48F BEG → LCA May 24, 08:20 UTCMay 24, 08:45 UTC25m
2026-05-23 ASL93T LJU → INI May 23, 19:00 UTCMay 23, 20:20 UTC1h 20m
2026-05-23 ASL26T INI → LJU May 23, 16:55 UTCMay 23, 18:10 UTC1h 15m
2026-05-23 ASL35F BEG → INI May 23, 15:10 UTCMay 23, 15:40 UTC30m
2026-05-23 ASL61J BEG → TIV May 23, 13:00 UTCMay 23, 14:15 UTC1h 15m
2026-05-23 ASL77B BEG → BRU May 23, 10:55 UTCMay 23, 12:00 UTC1h 5m
2026-05-23 ASL12E BEG → OPO May 23, 01:35 UTCMay 23, 02:50 UTC1h 14m
2026-05-22 ASL24B BER → BEG May 22, 22:55 UTCMay 23, 00:05 UTC1h 10m
2026-05-22 ASL68B BEG → PRG May 22, 19:25 UTCMay 22, 21:00 UTC1h 35m
2026-05-22 ASL79N BEG → VCE May 22, 16:50 UTCMay 22, 18:20 UTC1h 30m
2026-05-22 ASL12C BNX → BEG May 22, 10:00 UTCMay 22, 10:45 UTC45m
2026-05-22 ASL62B BEG → BNX May 22, 08:30 UTCMay 22, 08:55 UTC25m
2026-05-22 ASL45B IST → BEG May 22, 06:35 UTCMay 22, 07:35 UTC1h 0m
2026-05-22 ASL92Z BEG → BRI May 22, 04:35 UTCMay 22, 05:20 UTC45m
2026-05-21 ASL51D ZAG → BEG May 21, 13:30 UTCMay 21, 14:35 UTC1h 5m
2026-05-21 ASL30J BEG → ZAG May 21, 11:35 UTCMay 21, 12:20 UTC45m

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?
Yes. Mode-S 4C0244 is currently airborne.
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 ASL96B, ASL79Y, ASL45T, ASL37Z, ASL33K.