Apparatus

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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 Jul 23, 13:40 UTC
Flights observed
496
Distinct callsigns
20
Country
RS
Last broadcast
Jul 23, 13:40 UTC

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 12 2026-07-17
ASL77L - 11 2026-07-09
ASL72Q - 11 2026-07-17
ASL31Q - 11 2026-07-09
ASL89R Spurling Aviation 10 2026-07-02
ASL79Y - 10 2026-07-16
ASL73P Spurling Aviation 10 2026-07-20
ASL47P Spurling Aviation 10 2026-07-12
ASL47F - 10 2026-07-02
ASL33K - 10 2026-07-16
ASL26X Spurling Aviation 10 2026-07-12
ASL92Z - 9 2026-06-27
ASL45B - 9 2026-06-27
ASL34Q Spurling Aviation 8 2026-07-20
ASL96B Spurling Aviation 7 2026-07-23
ASL81C Spurling Aviation 7 2026-07-21
ASL64T Spurling Aviation 7 2026-05-19
ASL59D - 7 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 ASL80T - Jul 23, 13:25 UTCJul 23, 13:40 UTC15m
2026-07-23 ASL47C VAR → BEG Jul 23, 11:30 UTCJul 23, 12:35 UTC1h 5m
2026-07-23 ASL78U PRG → BEG Jul 23, 07:35 UTCJul 23, 09:10 UTC1h 35m
2026-07-23 ASL18R BEG → PRG Jul 23, 04:40 UTCJul 23, 06:30 UTC1h 50m
2026-07-23 ASL96B BEG → BLQ Jul 23, 02:30 UTCJul 23, 03:10 UTC40m
2026-07-22 ASL59D - Jul 22, 23:00 UTCJul 22, 23:35 UTC35m
2026-07-22 ASL51E BEG → ZRH Jul 22, 11:15 UTCJul 22, 11:25 UTC10m
2026-07-21 ASL93T - Jul 21, 20:15 UTCJul 21, 21:25 UTC1h 10m
2026-07-21 ASL26T INI → LJU Jul 21, 17:00 UTCJul 21, 18:40 UTC1h 40m
2026-07-21 ASL99C BEG → TBS Jul 21, 15:20 UTCJul 21, 15:40 UTC20m
2026-07-21 ASL49H ZRH → BEG Jul 21, 13:50 UTCJul 21, 14:20 UTC30m
2026-07-21 ASL81C BEG → SJJ Jul 21, 12:25 UTCJul 21, 13:00 UTC35m
2026-07-21 ASL78U PRG → BEG Jul 21, 07:40 UTCJul 21, 09:15 UTC1h 35m
2026-07-21 ASL18R BEG → PRG Jul 21, 04:40 UTCJul 21, 06:30 UTC1h 50m
2026-07-21 ASL96B - Jul 21, 02:20 UTCJul 21, 02:55 UTC35m
2026-07-20 ASL59D - Jul 20, 23:45 UTCJul 21, 00:20 UTC35m
2026-07-20 ASL28J BNX → BEG Jul 20, 17:20 UTCJul 20, 17:55 UTC35m
2026-07-20 ASL63P BEG → BNX Jul 20, 15:55 UTCJul 20, 16:25 UTC30m
2026-07-20 ASL34Q BEG → BER Jul 20, 13:50 UTCJul 20, 15:00 UTC1h 10m
2026-07-20 ASL73P VCE → BEG Jul 20, 12:00 UTCJul 20, 13:10 UTC1h 10m
2026-07-20 ASL10Q BUD → BEG Jul 20, 09:50 UTCJul 20, 10:45 UTC55m
2026-07-20 ASL34H BEG → BUD Jul 20, 08:00 UTCJul 20, 08:50 UTC50m
2026-07-20 ASL19N - Jul 20, 06:30 UTCJul 20, 07:05 UTC35m
2026-07-20 ASL23K - Jul 20, 04:30 UTCJul 20, 05:10 UTC40m
2026-07-19 ASL59E BUD → BEG Jul 19, 17:25 UTCJul 19, 18:20 UTC55m
2026-07-19 ASL57U BEG → BUD Jul 19, 15:55 UTCJul 19, 16:45 UTC50m
2026-07-19 ASL49H ZRH → BEG Jul 19, 14:20 UTCJul 19, 14:50 UTC30m
2026-07-19 ASL81C BEG → SJJ Jul 19, 12:25 UTCJul 19, 12:55 UTC30m
2026-07-19 ASL19N - Jul 19, 10:35 UTCJul 19, 11:10 UTC35m
2026-07-19 ASL82Z - Jul 19, 08:40 UTCJul 19, 09:05 UTC25m
2026-07-19 ASL28F - Jul 19, 07:25 UTCJul 19, 07:45 UTC20m
2026-07-19 ASL23K - Jul 19, 05:15 UTCJul 19, 05:50 UTC35m
2026-07-19 ASL33J - Jul 19, 02:00 UTCJul 19, 02:35 UTC35m
2026-07-18 ASL47G BEG → SKP Jul 18, 23:25 UTCJul 19, 00:05 UTC40m
2026-07-18 ASL31A BEG → LJU Jul 18, 16:30 UTCJul 18, 18:20 UTC1h 50m
2026-07-18 ASL77A BEG → HAJ Jul 18, 14:35 UTCJul 18, 15:25 UTC50m
2026-07-18 ASL2429 IST → KVO Jul 18, 11:50 UTCJul 18, 13:30 UTC1h 40m
2026-07-18 ASL2428 - Jul 18, 08:50 UTCJul 18, 10:30 UTC1h 40m
2026-07-18 ASL78V FCO → BEG Jul 18, 07:10 UTCJul 18, 07:25 UTC15m
2026-07-18 ASL40B OHD → BEG Jul 18, 01:45 UTCJul 18, 02:50 UTC1h 6m
2026-07-17 ASL96P - Jul 17, 23:00 UTCJul 17, 23:55 UTC55m
2026-07-17 ASL48G GOT → BEG Jul 17, 18:55 UTCJul 17, 20:29 UTC1h 35m
2026-07-17 ASL95Q BEG → BLQ Jul 17, 15:55 UTCJul 17, 17:55 UTC2h 0m
2026-07-17 ASL97E BUD → BEG Jul 17, 13:45 UTCJul 17, 14:35 UTC50m
2026-07-17 ASL72Q BEG → BUD Jul 17, 11:45 UTCJul 17, 12:45 UTC1h 0m
2026-07-17 ASL19N - Jul 17, 08:10 UTCJul 17, 08:45 UTC35m
2026-07-17 ASL23K - Jul 17, 06:00 UTCJul 17, 06:35 UTC35m
2026-07-16 ASL33K - Jul 16, 14:00 UTCJul 16, 14:40 UTC40m
2026-07-16 ASL79Y - Jul 16, 11:54 UTCJul 16, 12:34 UTC40m
2026-07-16 ASL77W - Jul 16, 08:20 UTCJul 16, 09:50 UTC1h 30m

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 Jul 23, 13:40 UTC.
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, ASL72Q.