Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4C0178

ICAO 24-bit transponder address · allocated to Serbia

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

Hex
4C0178
Octal
23000570
Decimal
4,981,112
Country
RS
Tail
YU-ALY
Type
AT76
No current signal · last broadcast 4h ago
Flights observed
443
Distinct callsigns
20
Country
RS
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 4C0178.

Country allocation

The ICAO 24-bit address 4C0178 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
ASL45T Spurling Aviation 13 2026-07-12
ASL37Z - 13 2026-07-12
ASL97E Spurling Aviation 11 2026-07-13
ASL77L - 11 2026-07-09
ASL31Q - 11 2026-07-09
ASL89R Spurling Aviation 10 2026-07-02
ASL72Q - 10 2026-07-13
ASL47P Spurling Aviation 10 2026-07-12
ASL47F - 10 2026-07-02
ASL26X Spurling Aviation 10 2026-07-12
ASL92Z - 9 2026-06-27
ASL79Y Spurling Aviation 9 2026-06-13
ASL73P Spurling Aviation 9 2026-07-10
ASL45B - 9 2026-06-27
ASL33K Spurling Aviation 9 2026-06-13
ASL64T Spurling Aviation 7 2026-05-19
ASL57F - 7 2026-06-21
ASL34Q Spurling Aviation 7 2026-07-10
ASL10N Spurling Aviation 7 2026-07-08
ASL72L Spurling Aviation 6 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASL75J - Jul 14, 17:50 UTCJul 14, 18:25 UTC35m
2026-07-14 ASL64X - Jul 14, 15:55 UTCJul 14, 16:30 UTC35m
2026-07-14 ASL32P BEG → LCA Jul 14, 14:05 UTCJul 14, 15:00 UTC55m
2026-07-14 ASL38Y - Jul 14, 11:40 UTCJul 14, 12:15 UTC35m
2026-07-13 ASL97E BUD → BEG Jul 13, 13:30 UTCJul 13, 14:25 UTC55m
2026-07-13 ASL72Q BEG → BUD Jul 13, 12:00 UTCJul 13, 12:50 UTC50m
2026-07-13 ASL10Q BUD → BEG Jul 13, 10:00 UTCJul 13, 10:55 UTC55m
2026-07-13 ASL34H BEG → BUD Jul 13, 08:01 UTCJul 13, 08:50 UTC50m
2026-07-13 ASL19N - Jul 13, 06:30 UTCJul 13, 07:05 UTC35m
2026-07-13 ASL23K - Jul 13, 04:40 UTCJul 13, 05:10 UTC30m
2026-07-12 ASL37Z VIE → BEG Jul 12, 19:10 UTCJul 12, 20:10 UTC1h 0m
2026-07-12 ASL45T BEG → VIE Jul 12, 17:01 UTCJul 12, 18:15 UTC1h 15m
2026-07-12 ASL47P SOF → BEG Jul 12, 14:35 UTCJul 12, 15:30 UTC55m
2026-07-12 ASL26X BEG → SOF Jul 12, 11:30 UTCJul 12, 12:20 UTC50m
2026-07-12 ASL59L - Jul 12, 08:40 UTCJul 12, 09:55 UTC1h 15m
2026-07-12 ASL83D - Jul 12, 05:35 UTCJul 12, 06:45 UTC1h 10m
2026-07-11 ASL37Z VIE → BEG Jul 11, 18:50 UTCJul 11, 19:50 UTC1h 0m
2026-07-11 ASL45T BEG → VIE Jul 11, 16:30 UTCJul 11, 17:45 UTC1h 15m
2026-07-11 ASL38V - Jul 11, 14:30 UTCJul 11, 15:30 UTC1h 0m
2026-07-11 ASL55B - Jul 11, 12:30 UTCJul 11, 13:35 UTC1h 5m
2026-07-11 ASL19N - Jul 11, 09:00 UTCJul 11, 09:30 UTC30m
2026-07-11 ASL23K - Jul 11, 06:40 UTCJul 11, 07:15 UTC35m
2026-07-11 ASL96B - Jul 11, 02:25 UTCJul 11, 03:01 UTC35m
2026-07-11 ASL59D - Jul 11, 00:00 UTCJul 11, 00:35 UTC35m
2026-07-10 ASL68B - Jul 10, 19:05 UTCJul 10, 20:25 UTC1h 20m
2026-07-10 ASL79N BEG → VCE Jul 10, 16:20 UTCJul 10, 17:55 UTC1h 35m
2026-07-10 ASL34Q BEG → BER Jul 10, 13:10 UTCJul 10, 14:25 UTC1h 15m
2026-07-10 ASL73P VCE → BEG Jul 10, 11:05 UTCJul 10, 12:20 UTC1h 15m
2026-07-10 ASL86N - Jul 10, 07:45 UTCJul 10, 09:10 UTC1h 25m
2026-07-10 ASL22F BEG → SZG Jul 10, 04:50 UTCJul 10, 06:35 UTC1h 45m
2026-07-09 ASL27L DBV → BEG Jul 9, 13:50 UTCJul 9, 14:50 UTC1h 0m
2026-07-09 ASL90A BEG → DBV Jul 9, 11:45 UTCJul 9, 12:40 UTC55m
2026-07-09 ASL31Q - Jul 9, 07:40 UTCJul 9, 08:50 UTC1h 10m
2026-07-09 ASL77L BEG → LJU Jul 9, 05:30 UTCJul 9, 06:45 UTC1h 15m
2026-07-08 ASL10N LJU → BEG Jul 8, 18:55 UTCJul 8, 20:05 UTC1h 10m
2026-07-08 ASL72L BEG → TIA Jul 8, 16:45 UTCJul 8, 18:05 UTC1h 20m
2026-07-08 ASL97E BUD → BEG Jul 8, 14:10 UTCJul 8, 15:05 UTC55m
2026-07-08 ASL72Q BEG → BUD Jul 8, 12:25 UTCJul 8, 13:15 UTC50m
2026-07-08 ASL19N - Jul 8, 10:50 UTCJul 8, 11:25 UTC35m
2026-07-08 ASL82Z - Jul 8, 09:05 UTCJul 8, 09:30 UTC25m
2026-07-08 ASL23K - Jul 8, 05:20 UTCJul 8, 05:55 UTC35m
2026-07-08 ASL96B - Jul 8, 02:25 UTCJul 8, 03:00 UTC35m
2026-07-07 ASL59D - Jul 7, 22:55 UTCJul 7, 23:40 UTC45m
2026-07-07 ASL36C - Jul 7, 17:50 UTCJul 7, 18:10 UTC20m
2026-07-07 ASL31A BEG → LJU Jul 7, 16:20 UTCJul 7, 17:15 UTC55m
2026-07-07 ASL77A BEG → HAJ Jul 7, 14:15 UTCJul 7, 15:00 UTC45m
2026-07-07 ASL2429 IST → KVO Jul 7, 11:45 UTCJul 7, 13:20 UTC1h 35m
2026-07-07 ASL2428 - Jul 7, 08:35 UTCJul 7, 10:10 UTC1h 35m
2026-07-07 ASL78V - Jul 7, 07:15 UTCJul 7, 07:30 UTC15m
2026-07-07 ASL33J - Jul 7, 02:00 UTCJul 7, 02:35 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-ALY page for operator, model, and routing details .

Mode-S 4C0178 frequently asked

What is Mode-S code 4C0178?
4C0178 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-ALY.
Where is Mode-S 4C0178 registered?
Mode-S code 4C0178 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C0178 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C0178, octal 23000570, decimal 4,981,112.
What flights does 4C0178 operate?
Mode-S 4C0178 has broadcast 20 distinct callsigns, including ASL45T, ASL37Z, ASL97E, ASL77L, ASL31Q.