Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4C0240

ICAO 24-bit transponder address · allocated to Serbia

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

Hex
4C0240
Octal
23001100
Decimal
4,981,312
Country
RS
Tail
YU-ASA
Type
AT76
No current signal · last broadcast 23d ago
Flights observed
307
Distinct callsigns
20
Country
RS
Last broadcast
23d ago

Last known position

Most recent position reported by Mode-S 4C0240.

Country allocation

The ICAO 24-bit address 4C0240 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
ASL77L Spurling Aviation 11 2026-07-25
ASL31Q Spurling Aviation 11 2026-07-25
ASL92Z - 10 2026-07-20
ASL79Y - 10 2026-07-13
ASL45B - 10 2026-07-20
ASL33K Spurling Aviation 10 2026-07-13
ASL47G Spurling Aviation 8 2026-07-23
ASL33J Spurling Aviation 8 2026-07-24
ASL81C Spurling Aviation 7 2026-07-26
ASL72L Spurling Aviation 7 2026-07-23
ASL49H Spurling Aviation 7 2026-07-26
ASL10N Spurling Aviation 7 2026-07-23
ASL80A - 6 2026-07-19
ASL44Q - 6 2026-07-19
ASL45T Spurling Aviation 5 2026-07-19
ASL38Y - 5 2026-07-23
ASL37Z - 5 2026-07-19
ASL34H - 5 2026-07-18
ASL32P Spurling Aviation 5 2026-07-23
ASL10Q - 5 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL77J FLR → BEG Jul 26, 19:05 UTCJul 26, 20:50 UTC1h 45m
2026-07-26 ASL48D LIS → BEG Jul 26, 16:10 UTCJul 26, 18:15 UTC2h 5m
2026-07-26 ASL49H ZRH → BEG Jul 26, 14:10 UTCJul 26, 14:45 UTC35m
2026-07-26 ASL81C BEG → SJJ Jul 26, 12:35 UTCJul 26, 13:05 UTC30m
2026-07-26 ASL19N LJU → BEG Jul 26, 11:05 UTCJul 26, 11:20 UTC15m
2026-07-26 ASL23K BEG → TIV Jul 26, 05:25 UTCJul 26, 05:45 UTC20m
2026-07-25 ASL62A - Jul 25, 13:25 UTCJul 25, 14:30 UTC1h 5m
2026-07-25 ASL84P BEG → RJK Jul 25, 11:25 UTCJul 25, 12:25 UTC1h 0m
2026-07-25 ASL31Q LJU → BEG Jul 25, 08:25 UTCJul 25, 09:30 UTC1h 5m
2026-07-25 ASL77L BEG → AMS Jul 25, 05:35 UTCJul 25, 06:45 UTC1h 10m
2026-07-24 ASL40Y - Jul 24, 13:25 UTCJul 24, 14:40 UTC1h 15m
2026-07-24 ASL74K - Jul 24, 11:15 UTCJul 24, 12:30 UTC1h 15m
2026-07-24 ASL31Q - Jul 24, 08:55 UTCJul 24, 10:10 UTC1h 15m
2026-07-24 ASL77L BEG → AMS Jul 24, 05:30 UTCJul 24, 06:45 UTC1h 15m
2026-07-24 ASL33J INI → BEG Jul 24, 02:15 UTCJul 24, 02:55 UTC40m
2026-07-23 ASL47G BEG → SKP Jul 23, 23:05 UTCJul 23, 23:40 UTC35m
2026-07-23 ASL10N LJU → BEG Jul 23, 18:55 UTCJul 23, 20:00 UTC1h 5m
2026-07-23 ASL72L BEG → TIA Jul 23, 16:55 UTCJul 23, 18:10 UTC1h 15m
2026-07-23 ASL32P BEG → LCA Jul 23, 15:15 UTCJul 23, 15:50 UTC35m
2026-07-23 ASL38Y - Jul 23, 13:00 UTCJul 23, 13:30 UTC30m
2026-07-23 ASL31Q - Jul 23, 07:45 UTCJul 23, 09:10 UTC1h 25m
2026-07-23 ASL77L BEG → AMS Jul 23, 05:35 UTCJul 23, 06:50 UTC1h 15m
2026-07-22 ASL10N LJU → BEG Jul 22, 19:00 UTCJul 22, 20:10 UTC1h 10m
2026-07-22 ASL72L BEG → TIA Jul 22, 16:50 UTCJul 22, 18:05 UTC1h 15m
2026-07-22 ASL88A FRA → BEG Jul 22, 14:05 UTCJul 22, 15:00 UTC55m
2026-07-22 ASL16F INI → CGN Jul 22, 11:35 UTCJul 22, 12:25 UTC50m
2026-07-20 ASL47F PRG → BEG Jul 20, 18:55 UTCJul 20, 20:30 UTC1h 35m
2026-07-20 ASL89R BEG → PRG Jul 20, 16:10 UTCJul 20, 18:00 UTC1h 50m
2026-07-20 ASL80T - Jul 20, 13:45 UTCJul 20, 15:00 UTC1h 15m
2026-07-20 ASL47C VAR → BEG Jul 20, 11:25 UTCJul 20, 12:40 UTC1h 15m
2026-07-20 ASL45B - Jul 20, 07:55 UTCJul 20, 08:45 UTC50m
2026-07-20 ASL92Z - Jul 20, 06:00 UTCJul 20, 06:50 UTC50m
2026-07-20 ASL68A SOF → BEG Jul 20, 02:10 UTCJul 20, 03:10 UTC1h 0m
2026-07-19 ASL15J BEG → SOF Jul 19, 23:20 UTCJul 20, 00:20 UTC1h 0m
2026-07-19 ASL37Z VIE → BEG Jul 19, 18:50 UTCJul 19, 19:55 UTC1h 5m
2026-07-19 ASL45T BEG → VIE Jul 19, 16:50 UTCJul 19, 18:05 UTC1h 15m
2026-07-19 ASL51D ZAG → BEG Jul 19, 13:25 UTCJul 19, 14:15 UTC50m
2026-07-19 ASL30J - Jul 19, 11:30 UTCJul 19, 12:25 UTC55m
2026-07-19 ASL44Q VIE → BEG Jul 19, 07:55 UTCJul 19, 08:55 UTC1h 0m
2026-07-19 ASL80A - Jul 19, 05:30 UTCJul 19, 06:40 UTC1h 10m
2026-07-18 ASL62A - Jul 18, 14:00 UTCJul 18, 15:05 UTC1h 5m
2026-07-18 ASL84P BEG → RJK Jul 18, 11:50 UTCJul 18, 12:55 UTC1h 5m
2026-07-18 ASL10Q - Jul 18, 09:30 UTCJul 18, 10:30 UTC1h 0m
2026-07-18 ASL34H BEG → BUD Jul 18, 07:55 UTCJul 18, 08:45 UTC50m
2026-07-18 ASL52D - Jul 18, 03:35 UTCJul 18, 05:10 UTC1h 35m
2026-07-18 ASL70Z - Jul 18, 00:10 UTCJul 18, 01:45 UTC1h 35m
2026-07-17 ASL80M BRI → BEG Jul 17, 18:40 UTCJul 17, 20:04 UTC1h 25m
2026-07-17 ASL24C BEG → BRI Jul 17, 16:24 UTCJul 17, 17:44 UTC1h 20m
2026-07-17 ASL40Y - Jul 17, 13:55 UTCJul 17, 15:00 UTC1h 5m
2026-07-17 ASL74K BEG → PUY Jul 17, 10:55 UTCJul 17, 12:19 UTC1h 25m

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

Mode-S 4C0240 frequently asked

What is Mode-S code 4C0240?
4C0240 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-ASA.
Where is Mode-S 4C0240 registered?
Mode-S code 4C0240 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C0240 broadcasting right now?
No active broadcast right now. Last signal was 23d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C0240, octal 23001100, decimal 4,981,312.
What flights does 4C0240 operate?
Mode-S 4C0240 has broadcast 20 distinct callsigns, including ASL77L, ASL31Q, ASL92Z, ASL79Y, ASL45B.