Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4C0176

ICAO 24-bit transponder address · allocated to Serbia

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

Hex
4C0176
Octal
23000566
Decimal
4,981,110
Country
RS
Tail
YU-ALW
Type
AT76
No current signal · last broadcast Jul 26, 20:40 UTC
Flights observed
579
Distinct callsigns
20
Country
RS
Last broadcast
Jul 26, 20:40 UTC

Last known position

Most recent position reported by Mode-S 4C0176.

Country allocation

The ICAO 24-bit address 4C0176 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
ASL79Y Spurling Aviation 16 2026-07-26
ASL38Y - 16 2026-07-21
ASL32P Spurling Aviation 16 2026-07-21
ASL33K - 15 2026-07-26
ASL31Q Spurling Aviation 15 2026-07-26
ASL77L Spurling Aviation 14 2026-07-26
ASL77B - 14 2026-07-15
ASL80A - 13 2026-07-17
ASL61J Spurling Aviation 13 2026-07-15
ASL44Q - 13 2026-07-17
ASL47P Spurling Aviation 12 2026-07-22
ASL26X - 12 2026-07-22
ASL72L Spurling Aviation 11 2026-07-06
ASL10N Spurling Aviation 11 2026-07-06
ASL45T Spurling Aviation 10 2026-07-18
ASL37Z - 10 2026-07-18
ASL97E Spurling Aviation 9 2026-06-24
ASL78U - 9 2026-07-18
ASL72Q - 9 2026-06-24
ASL47G Spurling Aviation 9 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL47F PRG → BEG Jul 26, 18:55 UTCJul 26, 20:40 UTC1h 45m
2026-07-26 ASL89R BEG → PRG Jul 26, 16:15 UTCJul 26, 17:55 UTC1h 40m
2026-07-26 ASL33K - Jul 26, 14:15 UTCJul 26, 14:30 UTC15m
2026-07-26 ASL79Y VIE → BEG Jul 26, 11:35 UTCJul 26, 11:45 UTC10m
2026-07-26 ASL31Q LJU → BEG Jul 26, 07:20 UTCJul 26, 08:25 UTC1h 5m
2026-07-26 ASL77L BEG → AMS Jul 26, 05:25 UTCJul 26, 06:40 UTC1h 16m
2026-07-25 ASL38V - Jul 25, 14:15 UTCJul 25, 15:10 UTC55m
2026-07-25 ASL55B - Jul 25, 12:25 UTCJul 25, 12:50 UTC25m
2026-07-25 ASL45B IST → BEG Jul 25, 08:40 UTCJul 25, 09:25 UTC45m
2026-07-25 ASL92Z BEG → BRI Jul 25, 05:55 UTCJul 25, 06:45 UTC50m
2026-07-25 ASL96B BEG → BLQ Jul 25, 03:05 UTCJul 25, 03:15 UTC10m
2026-07-24 ASL59D BEG → TIA Jul 24, 23:10 UTCJul 24, 23:35 UTC25m
2026-07-24 ASL80M BRI → BEG Jul 24, 19:55 UTCJul 24, 20:10 UTC15m
2026-07-24 ASL80M BRI → BEG Jul 24, 18:50 UTCJul 24, 19:25 UTC35m
2026-07-24 ASL24C BEG → BRI Jul 24, 16:30 UTCJul 24, 17:40 UTC1h 10m
2026-07-24 ASL33K - Jul 24, 14:40 UTCJul 24, 15:15 UTC35m
2026-07-24 ASL79Y - Jul 24, 12:25 UTCJul 24, 13:00 UTC35m
2026-07-24 ASL86N - Jul 24, 09:20 UTCJul 24, 11:05 UTC1h 45m
2026-07-24 ASL22F BEG → SZG Jul 24, 05:00 UTCJul 24, 06:35 UTC1h 35m
2026-07-24 ASL74F OTP → BEG Jul 24, 01:30 UTCJul 24, 02:40 UTC1h 10m
2026-07-23 ASL38Z BEG → OTP Jul 23, 23:35 UTCJul 24, 00:40 UTC1h 5m
2026-07-22 ASL18W - Jul 22, 18:50 UTCJul 22, 19:40 UTC50m
2026-07-22 ASL31J BEG → ZAG Jul 22, 17:00 UTCJul 22, 17:55 UTC55m
2026-07-22 ASL47P SOF → BEG Jul 22, 13:15 UTCJul 22, 14:10 UTC55m
2026-07-22 ASL26X - Jul 22, 11:35 UTCJul 22, 12:20 UTC45m
2026-07-21 ASL75J SOF → BEG Jul 21, 18:15 UTCJul 21, 18:55 UTC40m
2026-07-21 ASL64X - Jul 21, 16:20 UTCJul 21, 16:55 UTC35m
2026-07-21 ASL32P BEG → LCA Jul 21, 14:35 UTCJul 21, 15:20 UTC45m
2026-07-21 ASL38Y - Jul 21, 12:15 UTCJul 21, 12:55 UTC40m
2026-07-20 ASL33K - Jul 20, 15:05 UTCJul 20, 15:50 UTC45m
2026-07-20 ASL79Y - Jul 20, 12:45 UTCJul 20, 13:30 UTC45m
2026-07-20 ASL31Q - Jul 20, 07:45 UTCJul 20, 08:50 UTC1h 5m
2026-07-20 ASL77L - Jul 20, 05:35 UTCJul 20, 06:50 UTC1h 15m
2026-07-20 ASL33J - Jul 20, 02:20 UTCJul 20, 02:55 UTC35m
2026-07-20 ASL47G BEG → SKP Jul 20, 00:20 UTCJul 20, 01:00 UTC40m
2026-07-19 ASL45A - Jul 19, 16:35 UTCJul 19, 17:05 UTC30m
2026-07-19 ASL34Z - Jul 19, 14:15 UTCJul 19, 14:50 UTC35m
2026-07-19 ASL14U - Jul 19, 11:35 UTCJul 19, 12:05 UTC30m
2026-07-19 ASL17Y - Jul 19, 09:15 UTCJul 19, 09:50 UTC35m
2026-07-18 ASL37Z VIE → BEG Jul 18, 18:55 UTCJul 18, 20:00 UTC1h 5m
2026-07-18 ASL45T BEG → VIE Jul 18, 16:40 UTCJul 18, 17:55 UTC1h 15m
2026-07-18 ASL38V - Jul 18, 13:45 UTCJul 18, 14:25 UTC40m
2026-07-18 ASL55B - Jul 18, 11:40 UTCJul 18, 12:25 UTC45m
2026-07-18 ASL78U PRG → BEG Jul 18, 07:40 UTCJul 18, 09:20 UTC1h 40m
2026-07-18 ASL18R BEG → PRG Jul 18, 04:50 UTCJul 18, 06:40 UTC1h 50m
2026-07-18 ASL12E SKG → BEG Jul 18, 01:34 UTCJul 18, 02:50 UTC1h 16m
2026-07-17 ASL24B BEG → SKG Jul 17, 22:55 UTCJul 18, 00:04 UTC1h 10m
2026-07-17 ASL59E BUD → BEG Jul 17, 17:15 UTCJul 17, 18:00 UTC45m
2026-07-17 ASL57U BEG → BUD Jul 17, 15:25 UTCJul 17, 16:19 UTC55m
2026-07-17 ASL51D ZAG → BEG Jul 17, 13:15 UTCJul 17, 14:04 UTC50m

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

Mode-S 4C0176 frequently asked

What is Mode-S code 4C0176?
4C0176 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-ALW.
Where is Mode-S 4C0176 registered?
Mode-S code 4C0176 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C0176 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C0176, octal 23000566, decimal 4,981,110.
What flights does 4C0176 operate?
Mode-S 4C0176 has broadcast 20 distinct callsigns, including ASL79Y, ASL38Y, ASL32P, ASL33K, ASL31Q.