Apparatus

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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
Transponder active on ground
Flights observed
261
Distinct callsigns
20
Country
RS
Last broadcast
9h ago

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 Spurling Aviation 11 2026-05-25
ASL31Q Spurling Aviation 11 2026-05-25
ASL84H Spurling Aviation 8 2026-05-20
ASL81K Spurling Aviation 7 2026-05-20
ASL79Y Spurling Aviation 6 2026-05-23
ASL68A Spurling Aviation 6 2026-05-29
ASL47P Spurling Aviation 6 2026-05-28
ASL45T Spurling Aviation 6 2026-05-12
ASL38Y - 6 2026-05-20
ASL33K Spurling Aviation 6 2026-05-23
ASL32P Spurling Aviation 6 2026-05-20
ASL26X Spurling Aviation 6 2026-05-28
ASL15J Spurling Aviation 6 2026-05-28
ASL81C Spurling Aviation 5 2026-05-14
ASL72L Spurling Aviation 5 2026-05-29
ASL49H Spurling Aviation 5 2026-05-14
ASL37Z Spurling Aviation 5 2026-05-12
ASL30L Spurling Aviation 5 2026-05-25
ASL24M Spurling Aviation 5 2026-05-25
ASL18W Spurling Aviation 5 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 ASL10N LJU → BEG May 29, 18:55 UTCMay 29, 20:00 UTC1h 5m
2026-05-29 ASL72L BEG → TIA May 29, 16:45 UTCMay 29, 17:55 UTC1h 10m
2026-05-29 ASL40Y PUY → BEG May 29, 13:00 UTCMay 29, 14:20 UTC1h 20m
2026-05-29 ASL74K BEG → AMS May 29, 10:50 UTCMay 29, 12:00 UTC1h 10m
2026-05-29 ASL157 KRK → BEG May 29, 07:20 UTCMay 29, 08:40 UTC1h 20m
2026-05-29 ASL156 BEG → KRK May 29, 04:35 UTCMay 29, 06:10 UTC1h 35m
2026-05-29 ASL68A SOF → BEG May 29, 02:10 UTCMay 29, 03:05 UTC55m
2026-05-28 ASL15J BEG → SOF May 28, 22:50 UTCMay 28, 23:35 UTC45m
2026-05-28 ASL47P SOF → BEG May 28, 13:10 UTCMay 28, 14:05 UTC55m
2026-05-28 ASL26X BEG → SOF May 28, 11:25 UTCMay 28, 12:15 UTC50m
2026-05-28 ASL59L BRI → BEG May 28, 07:45 UTCMay 28, 09:10 UTC1h 25m
2026-05-28 ASL83D BEG → BRI May 28, 05:30 UTCMay 28, 06:40 UTC1h 10m
2026-05-27 ASL80T - May 27, 13:45 UTCMay 27, 14:55 UTC1h 10m
2026-05-27 ASL47C VAR → BEG May 27, 11:35 UTCMay 27, 12:45 UTC1h 10m
2026-05-26 ASL36C - May 26, 13:45 UTCMay 26, 14:14 UTC30m
2026-05-26 ASL2429 IST → KVO May 26, 11:24 UTCMay 26, 12:54 UTC1h 30m
2026-05-26 ASL2428 KVO → IST May 26, 07:55 UTCMay 26, 09:40 UTC1h 45m
2026-05-26 ASL78V FCO → BEG May 26, 06:49 UTCMay 26, 07:05 UTC15m
2026-05-25 ASL30L TGD → BEG May 25, 20:34 UTCMay 25, 21:15 UTC40m
2026-05-25 ASL24M BEG → TGD May 25, 18:50 UTCMay 25, 19:20 UTC30m
2026-05-25 ASL28J BNX → BEG May 25, 17:30 UTCMay 25, 18:00 UTC30m
2026-05-25 ASL63P BEG → BNX May 25, 16:05 UTCMay 25, 16:35 UTC30m
2026-05-25 ASL61J BEG → TIV May 25, 13:00 UTCMay 25, 14:10 UTC1h 10m
2026-05-25 ASL77B BEG → BRU May 25, 10:50 UTCMay 25, 12:00 UTC1h 10m
2026-05-25 ASL31Q LJU → BEG May 25, 07:30 UTCMay 25, 08:35 UTC1h 5m
2026-05-25 ASL77L BEG → AMS May 25, 05:30 UTCMay 25, 06:30 UTC1h 0m
2026-05-25 ASL12E BEG → OPO May 25, 01:55 UTCMay 25, 02:50 UTC55m
2026-05-24 ASL24B BER → BEG May 24, 23:00 UTCMay 24, 23:46 UTC46m
2026-05-24 ASL77J FLR → BEG May 24, 19:00 UTCMay 24, 20:50 UTC1h 50m
2026-05-24 ASL48D LIS → BEG May 24, 16:10 UTCMay 24, 17:50 UTC1h 40m
2026-05-24 ASL47P SOF → BEG May 24, 13:20 UTCMay 24, 14:10 UTC50m
2026-05-24 ASL26X BEG → SOF May 24, 11:35 UTCMay 24, 12:30 UTC55m
2026-05-24 ASL15A TGD → BEG May 24, 06:35 UTCMay 24, 07:10 UTC35m
2026-05-24 ASL57F BEG → CDG May 24, 04:40 UTCMay 24, 05:10 UTC30m
2026-05-23 ASL33K SKP → BEG May 23, 13:55 UTCMay 23, 14:30 UTC35m
2026-05-23 ASL79Y VIE → BEG May 23, 11:50 UTCMay 23, 12:35 UTC45m
2026-05-23 ASL31Q LJU → BEG May 23, 07:35 UTCMay 23, 08:50 UTC1h 15m
2026-05-23 ASL77L BEG → AMS May 23, 05:35 UTCMay 23, 06:35 UTC1h 0m
2026-05-23 ASL33J INI → BEG May 23, 02:20 UTCMay 23, 02:55 UTC34m
2026-05-22 ASL47G BEG → SKP May 22, 23:05 UTCMay 22, 23:45 UTC40m
2026-05-22 ASL18W ZAG → BEG May 22, 21:20 UTCMay 22, 22:05 UTC45m
2026-05-22 ASL31J BEG → ZAG May 22, 19:30 UTCMay 22, 20:15 UTC45m
2026-05-22 ASL59E BUD → BEG May 22, 17:50 UTCMay 22, 18:40 UTC50m
2026-05-22 ASL57U BEG → BUD May 22, 16:10 UTCMay 22, 16:55 UTC45m
2026-05-22 ASL61J BEG → TIV May 22, 12:55 UTCMay 22, 14:10 UTC1h 15m
2026-05-22 ASL77B BEG → BRU May 22, 10:55 UTCMay 22, 12:05 UTC1h 10m
2026-05-22 ASL44Q VIE → BEG May 22, 07:40 UTCMay 22, 08:55 UTC1h 15m
2026-05-22 ASL80A BEG → CPH May 22, 05:30 UTCMay 22, 06:40 UTC1h 10m
2026-05-21 ASL47P SOF → BEG May 21, 13:50 UTCMay 21, 14:30 UTC40m
2026-05-21 ASL26X BEG → SOF May 21, 11:45 UTCMay 21, 12:20 UTC35m

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?
Mode-S 4C0179 is currently broadcasting from the ground.
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, ASL84H, ASL81K, ASL79Y.