Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4C0179

ICAO 24-bit transponder address · allocated to Serbia

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

Hex
4C0179
Octal
23000571
Decimal
4,981,113
Country
RS
Tail
YU-ALZ
Type
AT76
No current signal · last broadcast Jul 26, 20:00 UTC
Flights observed
585
Distinct callsigns
20
Country
RS
Last broadcast
Jul 26, 20:00 UTC

Last known position

Most recent position reported by Mode-S 4C0179.

Country allocation

The ICAO 24-bit address 4C0179 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 - 17 2026-07-14
ASL31Q - 17 2026-07-14
ASL80A - 14 2026-07-15
ASL45T Spurling Aviation 14 2026-07-26
ASL44Q - 14 2026-07-15
ASL47P Spurling Aviation 13 2026-07-25
ASL37Z - 13 2026-07-26
ASL26X - 13 2026-07-25
ASL97E Spurling Aviation 12 2026-07-23
ASL79Y - 12 2026-07-11
ASL72Q - 12 2026-07-23
ASL72L Spurling Aviation 12 2026-07-17
ASL33K Spurling Aviation 12 2026-07-11
ASL10N Spurling Aviation 12 2026-07-17
ASL38Y - 10 2026-07-09
ASL32P Spurling Aviation 10 2026-07-09
ASL81C Spurling Aviation 9 2026-07-05
ASL49H Spurling Aviation 9 2026-07-05
ASL24B - 9 2026-07-12
ASL12E - 9 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL37Z VIE → BEG Jul 26, 18:50 UTCJul 26, 19:55 UTC1h 5m
2026-07-26 ASL45T BEG → VIE Jul 26, 16:55 UTCJul 26, 18:05 UTC1h 10m
2026-07-26 ASL45A - Jul 26, 15:20 UTCJul 26, 15:35 UTC15m
2026-07-26 ASL34Z - Jul 26, 13:00 UTCJul 26, 13:15 UTC15m
2026-07-26 ASL14U BEG → OHD Jul 26, 11:50 UTCJul 26, 12:05 UTC15m
2026-07-26 ASL17Y BEG → TIV Jul 26, 09:15 UTCJul 26, 09:30 UTC15m
2026-07-25 ASL47P SOF → BEG Jul 25, 14:00 UTCJul 25, 14:55 UTC55m
2026-07-25 ASL26X - Jul 25, 12:00 UTCJul 25, 12:55 UTC55m
2026-07-25 ASL19N LJU → BEG Jul 25, 10:20 UTCJul 25, 10:40 UTC20m
2026-07-25 ASL23K BEG → TIV Jul 25, 07:30 UTCJul 25, 07:50 UTC20m
2026-07-24 ASL18W - Jul 24, 20:45 UTCJul 24, 21:30 UTC45m
2026-07-24 ASL31J BEG → ZAG Jul 24, 19:00 UTCJul 24, 19:50 UTC50m
2026-07-24 ASL59E BUD → BEG Jul 24, 17:20 UTCJul 24, 18:10 UTC50m
2026-07-24 ASL57U BEG → BUD Jul 24, 15:50 UTCJul 24, 16:40 UTC50m
2026-07-24 ASL87P - Jul 24, 09:55 UTCJul 24, 11:50 UTC1h 55m
2026-07-24 ASL47D BEG → FLR Jul 24, 04:45 UTCJul 24, 06:40 UTC1h 55m
2026-07-23 ASL97E BUD → BEG Jul 23, 14:05 UTCJul 23, 15:00 UTC55m
2026-07-23 ASL72Q BEG → BUD Jul 23, 12:30 UTCJul 23, 13:20 UTC50m
2026-07-23 ASL10Q BUD → BEG Jul 23, 10:35 UTCJul 23, 11:35 UTC1h 0m
2026-07-23 ASL34H BEG → BUD Jul 23, 08:00 UTCJul 23, 08:55 UTC55m
2026-07-23 ASL52D VAR → BEG Jul 23, 01:25 UTCJul 23, 03:00 UTC1h 35m
2026-07-22 ASL70Z - Jul 22, 22:55 UTCJul 23, 00:25 UTC1h 30m
2026-07-22 ASL38V - Jul 22, 14:10 UTCJul 22, 14:55 UTC45m
2026-07-22 ASL55B - Jul 22, 12:20 UTCJul 22, 13:00 UTC40m
2026-07-22 ASL33J INI → BEG Jul 22, 02:20 UTCJul 22, 03:00 UTC40m
2026-07-21 ASL47G BEG → SKP Jul 21, 23:05 UTCJul 21, 23:40 UTC35m
2026-07-20 ASL80M BRI → BEG Jul 20, 19:20 UTCJul 20, 20:40 UTC1h 20m
2026-07-20 ASL24C BEG → BRI Jul 20, 16:30 UTCJul 20, 18:00 UTC1h 30m
2026-07-20 ASL47P SOF → BEG Jul 20, 13:40 UTCJul 20, 14:50 UTC1h 10m
2026-07-20 ASL26X BEG → SOF Jul 20, 12:00 UTCJul 20, 12:55 UTC55m
2026-07-20 ASL77W - Jul 20, 07:50 UTCJul 20, 09:15 UTC1h 25m
2026-07-20 ASL36Q BEG → VCE Jul 20, 05:00 UTCJul 20, 06:45 UTC1h 45m
2026-07-19 ASL47F PRG → BEG Jul 19, 19:20 UTCJul 19, 21:10 UTC1h 50m
2026-07-19 ASL89R BEG → PRG Jul 19, 16:40 UTCJul 19, 18:30 UTC1h 50m
2026-07-17 ASL10N LJU → BEG Jul 17, 18:55 UTCJul 17, 19:55 UTC1h 0m
2026-07-17 ASL72L BEG → TIA Jul 17, 16:49 UTCJul 17, 18:10 UTC1h 20m
2026-07-17 ASL61J BEG → TIV Jul 17, 13:05 UTCJul 17, 14:10 UTC1h 5m
2026-07-17 ASL77B BEG → VIE Jul 17, 10:55 UTCJul 17, 12:19 UTC1h 25m
2026-07-17 ASL86N - Jul 17, 07:35 UTCJul 17, 09:04 UTC1h 30m
2026-07-17 ASL22F - Jul 17, 04:59 UTCJul 17, 06:40 UTC1h 40m
2026-07-16 ASL97E BUD → BEG Jul 16, 13:34 UTCJul 16, 14:29 UTC55m
2026-07-16 ASL72Q BEG → BUD Jul 16, 11:54 UTCJul 16, 12:40 UTC45m
2026-07-16 ASL10Q - Jul 16, 09:45 UTCJul 16, 10:40 UTC55m
2026-07-16 ASL34H BEG → BUD Jul 16, 08:00 UTCJul 16, 08:50 UTC50m
2026-07-16 ASL96B - Jul 16, 02:35 UTCJul 16, 03:10 UTC35m
2026-07-15 ASL59D - Jul 15, 23:20 UTCJul 15, 23:55 UTC35m
2026-07-15 ASL40Y - Jul 15, 13:30 UTCJul 15, 14:45 UTC1h 15m
2026-07-15 ASL74K - Jul 15, 11:00 UTCJul 15, 12:30 UTC1h 30m
2026-07-15 ASL44Q VIE → BEG Jul 15, 07:45 UTCJul 15, 08:50 UTC1h 5m
2026-07-15 ASL80A BEG → VIE Jul 15, 05:30 UTCJul 15, 06:40 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-ALZ page for operator, model, and routing details .

Mode-S 4C0179 frequently asked

What is Mode-S code 4C0179?
4C0179 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-ALZ.
Where is Mode-S 4C0179 registered?
Mode-S code 4C0179 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C0179 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C0179, octal 23000571, decimal 4,981,113.
What flights does 4C0179 operate?
Mode-S 4C0179 has broadcast 20 distinct callsigns, including ASL77L, ASL31Q, ASL80A, ASL45T, ASL44Q.