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 8h ago
Flights observed
211
Distinct callsigns
20
Country
RS
Last broadcast
8h 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
ASL92Z - 7 2026-06-20
ASL79Y Spurling Aviation 7 2026-06-29
ASL77L - 7 2026-07-01
ASL45B - 7 2026-06-20
ASL33K Spurling Aviation 7 2026-06-29
ASL31Q - 7 2026-07-01
ASL81C Spurling Aviation 5 2026-06-28
ASL80A - 5 2026-06-28
ASL49H Spurling Aviation 5 2026-06-28
ASL47G - 5 2026-06-26
ASL44Q - 5 2026-06-28
ASL33J - 5 2026-06-27
ASL72L Spurling Aviation 4 2026-06-19
ASL38Y - 4 2026-06-19
ASL34H - 4 2026-06-27
ASL32P Spurling Aviation 4 2026-06-19
ASL10Q - 4 2026-06-27
ASL10N Spurling Aviation 4 2026-06-19
ASL97E Spurling Aviation 3 2026-06-04
ASL96B - 3 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-04 ASL47P SOF → BEG Jul 4, 13:10 UTCJul 4, 14:00 UTC50m
2026-07-04 ASL26X BEG → SOF Jul 4, 11:25 UTCJul 4, 12:20 UTC55m
2026-07-04 ASL96B - Jul 4, 02:20 UTCJul 4, 03:00 UTC40m
2026-07-03 ASL59D - Jul 3, 23:05 UTCJul 3, 23:45 UTC40m
2026-07-03 ASL30L - Jul 3, 20:35 UTCJul 3, 21:05 UTC30m
2026-07-03 ASL24M - Jul 3, 18:50 UTCJul 3, 19:20 UTC30m
2026-07-01 ASL31Q - Jul 1, 07:40 UTCJul 1, 08:45 UTC1h 5m
2026-07-01 ASL77L BEG → LJU Jul 1, 05:40 UTCJul 1, 06:45 UTC1h 5m
2026-06-30 ASL36C - Jun 30, 19:00 UTCJun 30, 19:20 UTC20m
2026-06-30 ASL31A BEG → LJU Jun 30, 17:20 UTCJun 30, 18:20 UTC1h 0m
2026-06-30 ASL77A BEG → HAJ Jun 30, 15:00 UTCJun 30, 15:55 UTC55m
2026-06-30 ASL2429 IST → KVO Jun 30, 12:00 UTCJun 30, 13:40 UTC1h 40m
2026-06-30 ASL2428 - Jun 30, 08:40 UTCJun 30, 10:35 UTC1h 55m
2026-06-30 ASL78V - Jun 30, 07:20 UTCJun 30, 07:35 UTC15m
2026-06-29 ASL80M BRI → BEG Jun 29, 18:44 UTCJun 29, 20:04 UTC1h 20m
2026-06-29 ASL24C BEG → BRI Jun 29, 16:25 UTCJun 29, 17:45 UTC1h 20m
2026-06-29 ASL33K SKP → BEG Jun 29, 13:54 UTCJun 29, 14:25 UTC30m
2026-06-29 ASL79Y VIE → BEG Jun 29, 11:50 UTCJun 29, 12:29 UTC40m
2026-06-28 ASL18W - Jun 28, 20:39 UTCJun 28, 21:30 UTC50m
2026-06-28 ASL31J BEG → ZAG Jun 28, 19:04 UTCJun 28, 19:55 UTC50m
2026-06-28 ASL49H ZRH → BEG Jun 28, 17:34 UTCJun 28, 18:05 UTC30m
2026-06-28 ASL81C BEG → SJJ Jun 28, 16:09 UTCJun 28, 16:39 UTC30m
2026-06-28 ASL33K SKP → BEG Jun 28, 13:45 UTCJun 28, 14:30 UTC45m
2026-06-28 ASL79Y VIE → BEG Jun 28, 11:35 UTCJun 28, 12:15 UTC40m
2026-06-28 ASL44Q VIE → BEG Jun 28, 07:40 UTCJun 28, 08:50 UTC1h 10m
2026-06-28 ASL80A BEG → VIE Jun 28, 05:29 UTCJun 28, 06:40 UTC1h 10m
2026-06-27 ASL27L DBV → BEG Jun 27, 13:30 UTCJun 27, 14:29 UTC1h 0m
2026-06-27 ASL90A BEG → DBV Jun 27, 11:39 UTCJun 27, 12:39 UTC1h 0m
2026-06-27 ASL10Q BUD → BEG Jun 27, 09:50 UTCJun 27, 10:34 UTC45m
2026-06-27 ASL34H BEG → BUD Jun 27, 07:59 UTCJun 27, 08:55 UTC55m
2026-06-27 ASL33J - Jun 27, 02:09 UTCJun 27, 02:45 UTC35m
2026-06-26 ASL47G - Jun 26, 23:09 UTCJun 26, 23:55 UTC45m
2026-06-26 ASL19N - Jun 26, 08:10 UTCJun 26, 08:45 UTC35m
2026-06-26 ASL23K - Jun 26, 06:09 UTCJun 26, 06:39 UTC30m
2026-06-25 ASL33K SKP → BEG Jun 25, 13:45 UTCJun 25, 14:20 UTC35m
2026-06-25 ASL79Y VIE → BEG Jun 25, 11:50 UTCJun 25, 12:30 UTC40m
2026-06-25 ASL59L BRI → BEG Jun 25, 07:39 UTCJun 25, 09:05 UTC1h 25m
2026-06-25 ASL83D - Jun 25, 05:29 UTCJun 25, 06:40 UTC1h 10m
2026-06-25 ASL33J - Jun 25, 02:10 UTCJun 25, 02:54 UTC45m
2026-06-24 ASL47G - Jun 24, 23:20 UTCJun 24, 23:59 UTC40m
2026-06-24 ASL38V - Jun 24, 15:54 UTCJun 24, 16:40 UTC45m
2026-06-24 ASL55B - Jun 24, 14:00 UTCJun 24, 14:39 UTC40m
2026-06-24 ASL51E BEG → ZRH Jun 24, 12:14 UTCJun 24, 12:54 UTC40m
2026-06-24 ASL40T - Jun 24, 09:34 UTCJun 24, 10:45 UTC1h 10m
2026-06-24 ASL14D - Jun 24, 07:15 UTCJun 24, 08:20 UTC1h 5m
2026-06-23 ASL93T LJU → INI Jun 23, 22:29 UTCJun 23, 23:44 UTC1h 15m
2026-06-23 ASL26T INI → LJU Jun 23, 20:24 UTCJun 23, 21:49 UTC1h 25m
2026-06-23 ASL99C BEG → TBS Jun 23, 18:55 UTCJun 23, 19:24 UTC30m
2026-06-23 ASL99C BEG → TBS Jun 23, 15:34 UTCJun 23, 17:15 UTC1h 40m
2026-06-23 ASL49H ZRH → BEG Jun 23, 13:55 UTCJun 23, 14:35 UTC40m

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 8h 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 ASL92Z, ASL79Y, ASL77L, ASL45B, ASL33K.