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sensors Mode-S transponder

501C4B

ICAO 24-bit transponder address · allocated to Croatia

Currently assigned to 9A-CAQ · AIRBUS A220-100

Hex
501C4B
Octal
24016113
Decimal
5,250,123
Country
HR
Tail
9A-CAQ
Type
BCS1
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
683
Distinct callsigns
20
Country
HR
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S 501C4B.

Country allocation

The ICAO 24-bit address 501C4B falls within the block assigned to Croatia (HR) by ICAO Annex 10, Volume III. Every aircraft registered in Croatia 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
CTN381 Croatia Airlines 40 2026-07-25
CTN380 Croatia Airlines 40 2026-07-25
CTN56E Croatia Airlines 23 2026-07-23
CTN456 Croatia Airlines 23 2026-07-23
CTN438P Croatia Airlines 21 2026-07-25
CTN301 Croatia Airlines 20 2026-07-26
CTN3RC Croatia Airlines 18 2026-07-26
CTN39PR Croatia Airlines 18 2026-07-25
CTN461 - 15 2026-07-16
CTN4457 - 15 2026-07-22
CTN4456 - 15 2026-07-22
CTN460 - 14 2026-07-16
CTN385 Croatia Airlines 14 2026-07-26
CTN384 Croatia Airlines 14 2026-07-26
CTN2S Croatia Airlines 14 2026-07-20
CTN5N - 13 2026-07-20
CTN6B Croatia Airlines 10 2026-07-22
CTN76H Croatia Airlines 9 2026-07-24
CTN75C Croatia Airlines 9 2026-07-24
CTN724D - 9 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CTN301 ATH → DBV Jul 26, 20:50 UTCJul 26, 21:40 UTC50m
2026-07-26 CTN301 ATH → DBV Jul 26, 18:25 UTCJul 26, 19:50 UTC1h 25m
2026-07-26 CTN3RC DBV → ATH Jul 26, 15:25 UTCJul 26, 16:40 UTC1h 15m
2026-07-26 CTN3RC DBV → ATH Jul 26, 13:45 UTCJul 26, 14:25 UTC40m
2026-07-26 CTN385 FCO → ZAG Jul 26, 12:05 UTCJul 26, 12:45 UTC40m
2026-07-26 CTN385 FCO → ZAG Jul 26, 10:20 UTCJul 26, 11:10 UTC50m
2026-07-26 CTN384 ZAG → FCO Jul 26, 07:05 UTCJul 26, 08:05 UTC1h 0m
2026-07-26 CTN384 ZAG → FCO Jul 26, 05:40 UTCJul 26, 06:15 UTC35m
2026-07-25 CTN4HV VIE → SPU Jul 25, 22:15 UTCJul 25, 22:45 UTC30m
2026-07-25 CTN4AU SPU → VIE Jul 25, 20:15 UTCJul 25, 21:00 UTC45m
2026-07-25 CTN4463 ZRH → SPU Jul 25, 17:15 UTCJul 25, 18:10 UTC55m
2026-07-25 CTN4462 SPU → ZRH Jul 25, 14:45 UTCJul 25, 15:45 UTC1h 0m
2026-07-25 CTN381 FCO → ZAG Jul 25, 12:50 UTCJul 25, 13:25 UTC35m
2026-07-25 CTN380 ZAG → SPU Jul 25, 10:45 UTCJul 25, 11:20 UTC35m
2026-07-25 CTN39PR MUC → SPU Jul 25, 08:45 UTCJul 25, 09:30 UTC45m
2026-07-25 CTN438P SPU → MUC Jul 25, 06:45 UTCJul 25, 07:35 UTC50m
2026-07-24 CTN104C NTE → SPU Jul 24, 19:45 UTCJul 24, 21:25 UTC1h 40m
2026-07-24 CTN4010 - Jul 24, 16:05 UTCJul 24, 18:05 UTC2h 0m
2026-07-24 CTN75C ZRH → SPU Jul 24, 13:55 UTCJul 24, 14:50 UTC55m
2026-07-24 CTN76H SPU → ZRH Jul 24, 11:50 UTCJul 24, 13:10 UTC1h 20m
2026-07-24 CTN39PR MUC → SPU Jul 24, 09:45 UTCJul 24, 10:25 UTC40m
2026-07-24 CTN438P SPU → MUC Jul 24, 06:40 UTCJul 24, 07:50 UTC1h 10m
2026-07-23 CTN4HV VIE → SPU Jul 23, 19:15 UTCJul 23, 19:50 UTC35m
2026-07-23 CTN4AU - Jul 23, 17:40 UTCJul 23, 18:20 UTC40m
2026-07-23 CTN654 ZAG → SPU Jul 23, 16:00 UTCJul 23, 16:25 UTC25m
2026-07-23 CTN6H - Jul 23, 11:45 UTCJul 23, 12:25 UTC40m
2026-07-23 CTN8Y ZAG → DBV Jul 23, 10:05 UTCJul 23, 10:45 UTC40m
2026-07-23 CTN56E BRU → ZAG Jul 23, 07:40 UTCJul 23, 09:00 UTC1h 20m
2026-07-23 CTN456 ZAG → BRU Jul 23, 04:55 UTCJul 23, 06:30 UTC1h 35m
2026-07-22 CTN4457 - Jul 22, 18:50 UTCJul 22, 20:05 UTC1h 15m
2026-07-22 CTN4456 - Jul 22, 16:15 UTCJul 22, 17:50 UTC1h 35m
2026-07-22 CTN487 ARN → ZAG Jul 22, 10:20 UTCJul 22, 11:40 UTC1h 20m
2026-07-22 CTN6B DBV → ZAG Jul 22, 04:30 UTCJul 22, 05:05 UTC35m
2026-07-21 CTN664 ZAG → DBV Jul 21, 21:00 UTCJul 21, 21:40 UTC40m
2026-07-21 CTN4409 BER → ZAG Jul 21, 18:50 UTCJul 21, 19:55 UTC1h 5m
2026-07-21 CTN4408 ZAG → BER Jul 21, 16:20 UTCJul 21, 17:40 UTC1h 20m
2026-07-21 CTN6J DBV → ZAG Jul 21, 14:30 UTCJul 21, 15:15 UTC45m
2026-07-21 CTN8A - Jul 21, 13:05 UTCJul 21, 13:45 UTC40m
2026-07-21 CTN481 - Jul 21, 09:50 UTCJul 21, 11:20 UTC1h 30m
2026-07-21 CTN480 ZAG → CPH Jul 21, 06:55 UTCJul 21, 08:30 UTC1h 35m
2026-07-20 CTN82W - Jul 20, 19:35 UTCJul 20, 21:15 UTC1h 40m
2026-07-20 CTN82R ZAG → LHR Jul 20, 16:00 UTCJul 20, 18:25 UTC2h 25m
2026-07-20 CTN5N - Jul 20, 12:15 UTCJul 20, 12:25 UTC10m
2026-07-20 CTN2S ZAG → SPU Jul 20, 10:30 UTCJul 20, 10:55 UTC25m
2026-07-20 CTN56E - Jul 20, 07:50 UTCJul 20, 09:10 UTC1h 20m
2026-07-20 CTN456 ZAG → BRU Jul 20, 05:05 UTCJul 20, 06:45 UTC1h 40m
2026-07-19 CTN381 - Jul 19, 19:20 UTCJul 19, 19:35 UTC15m
2026-07-19 CTN381 - Jul 19, 17:00 UTCJul 19, 17:30 UTC30m
2026-07-19 CTN380 - Jul 19, 14:50 UTCJul 19, 15:30 UTC40m
2026-07-19 CTN380 - Jul 19, 13:10 UTCJul 19, 13:40 UTC30m

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 9A-CAQ page for operator, model, and routing details .

Mode-S 501C4B frequently asked

What is Mode-S code 501C4B?
501C4B is an ICAO 24-bit transponder address. Allocated to Croatia. Assigned to 9A-CAQ.
Where is Mode-S 501C4B registered?
Mode-S code 501C4B is allocated to Croatia (HR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 501C4B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 501C4B, octal 24016113, decimal 5,250,123.
What flights does 501C4B operate?
Mode-S 501C4B has broadcast 20 distinct callsigns, including CTN381, CTN380, CTN56E, CTN456, CTN438P.