Apparatus

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sensors Mode-S transponder

501C42

ICAO 24-bit transponder address · allocated to Croatia

Currently assigned to 9A-CAL · AIRBUS A220-300

Hex
501C42
Octal
24016102
Decimal
5,250,114
Country
HR
Tail
9A-CAL
Type
BCS3
Broadcasting now · callsign CTN2847 · 35,000 ft
Flights observed
199
Distinct callsigns
20
Country
HR
Last broadcast
2h ago

Current position

501C42 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 501C42 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
CTN3RC Croatia Airlines 10 2026-05-24
CTN301 Croatia Airlines 8 2026-05-24
CTN9HR Croatia Airlines 5 2026-05-15
CTN8A Croatia Airlines 5 2026-05-12
CTN415 Croatia Airlines 5 2026-05-29
CTN414 Croatia Airlines 5 2026-05-29
CTN410 Croatia Airlines 5 2026-05-15
CTN284E Croatia Airlines 5 2026-05-30
CTN6J Croatia Airlines 4 2026-05-12
CTN513 Croatia Airlines 4 2026-05-26
CTN512 Croatia Airlines 4 2026-05-26
CTN438P Croatia Airlines 4 2026-05-28
CTN39PR Croatia Airlines 4 2026-05-28
CTN384E Croatia Airlines 4 2026-05-30
CTN76H Croatia Airlines 3 2026-05-25
CTN75C Croatia Airlines 3 2026-05-25
CTN5NL Croatia Airlines 3 2026-05-29
CTN5H Croatia Airlines 3 2026-05-24
CTN4AS Croatia Airlines 3 2026-05-29
CTN487 Croatia Airlines 3 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CTN2841 OSD → SPU May 30, 17:40 UTCMay 30, 18:00 UTC20m
2026-05-30 CTN2840 SPU → OSD May 30, 13:35 UTCMay 30, 16:35 UTC3h 0m
2026-05-30 CTN384E SPU → CPH May 30, 10:15 UTCMay 30, 11:55 UTC1h 40m
2026-05-30 CTN284E CPH → SPU May 30, 06:45 UTCMay 30, 08:45 UTC2h 0m
2026-05-29 CTN415 FRA → ZAG May 29, 19:15 UTCMay 29, 20:25 UTC1h 10m
2026-05-29 CTN414 ZAG → FRA May 29, 16:40 UTCMay 29, 17:45 UTC1h 5m
2026-05-29 CTN369 SKP → ZAG May 29, 14:25 UTCMay 29, 15:10 UTC45m
2026-05-29 CTN368 ZAG → SKP May 29, 12:25 UTCMay 29, 13:10 UTC45m
2026-05-29 CTN4AS AMS → ZAG May 29, 09:40 UTCMay 29, 11:05 UTC1h 25m
2026-05-29 CTN5NL ZAG → AMS May 29, 06:45 UTCMay 29, 08:25 UTC1h 40m
2026-05-28 CTN437 MUC → ZAG May 28, 19:30 UTCMay 28, 20:05 UTC35m
2026-05-28 CTN430 SPU → MUC May 28, 16:35 UTCMay 28, 17:30 UTC55m
2026-05-28 CTN395 MXP → SPU May 28, 13:30 UTCMay 28, 14:20 UTC50m
2026-05-28 CTN394 SPU → MXP May 28, 11:30 UTCMay 28, 12:30 UTC1h 0m
2026-05-28 CTN39PR MUC → SPU May 28, 09:15 UTCMay 28, 10:05 UTC50m
2026-05-28 CTN438P SPU → MUC May 28, 07:00 UTCMay 28, 08:05 UTC1h 5m
2026-05-27 CTN3502 ORK → ORK May 27, 17:50 UTCMay 27, 20:25 UTC2h 35m
2026-05-27 CTN3501 SNN → ORK May 27, 16:40 UTCMay 27, 17:00 UTC20m
2026-05-27 CTN35RL SPU → DUB May 27, 12:40 UTCMay 27, 15:35 UTC2h 55m
2026-05-27 CTN384E SPU → CPH May 27, 09:25 UTCMay 27, 11:05 UTC1h 40m
2026-05-27 CTN284E CPH → SPU May 27, 06:25 UTCMay 27, 08:20 UTC1h 56m
2026-05-26 CTN513 DUB → ZAG May 26, 10:10 UTCMay 26, 12:35 UTC2h 25m
2026-05-26 CTN512 SPU → DUB May 26, 05:59 UTCMay 26, 08:39 UTC2h 40m
2026-05-25 CTN32CZ PRG → SPU May 25, 18:35 UTCMay 25, 19:30 UTC54m
2026-05-25 CTN4324 SPU → PRG May 25, 16:00 UTCMay 25, 17:10 UTC1h 10m
2026-05-25 CTN75C ZRH → SPU May 25, 13:35 UTCMay 25, 14:35 UTC1h 0m
2026-05-25 CTN76H SPU → ZRH May 25, 11:05 UTCMay 25, 12:25 UTC1h 20m
2026-05-25 CTN39PR MUC → SPU May 25, 08:55 UTCMay 25, 09:45 UTC50m
2026-05-25 CTN438P SPU → MUC May 25, 06:40 UTCMay 25, 07:40 UTC1h 0m
2026-05-24 CTN301 ATH → DBV May 24, 19:55 UTCMay 24, 20:25 UTC30m
2026-05-24 CTN301 ATH → DBV May 24, 17:35 UTCMay 24, 18:45 UTC1h 10m
2026-05-24 CTN3RC DBV → ATH May 24, 15:15 UTCMay 24, 16:30 UTC1h 15m
2026-05-24 CTN3RC DBV → ATH May 24, 13:35 UTCMay 24, 14:15 UTC40m
2026-05-24 CTN4AS AMS → ZAG May 24, 09:55 UTCMay 24, 11:25 UTC1h 30m
2026-05-24 CTN5NL ZAG → AMS May 24, 06:45 UTCMay 24, 08:30 UTC1h 45m
2026-05-24 CTN5H SPU → ZAG May 24, 04:30 UTCMay 24, 04:55 UTC25m
2026-05-23 CTN2841 OSD → SPU May 23, 17:50 UTCMay 23, 20:25 UTC2h 35m
2026-05-23 CTN2840 SPU → OSD May 23, 13:40 UTCMay 23, 16:30 UTC2h 50m
2026-05-23 CTN384E SPU → CPH May 23, 10:10 UTCMay 23, 11:55 UTC1h 45m
2026-05-23 CTN284E CPH → SPU May 23, 08:10 UTCMay 23, 08:40 UTC30m
2026-05-23 CTN284E CPH → SPU May 23, 06:45 UTCMay 23, 08:05 UTC1h 20m
2026-05-22 CTN495 LGW → SPU May 22, 16:05 UTCMay 22, 17:55 UTC1h 50m
2026-05-22 CTN494 SPU → LGW May 22, 12:25 UTCMay 22, 14:40 UTC2h 15m
2026-05-22 CTN4487 ARN → SPU May 22, 08:45 UTCMay 22, 10:45 UTC2h 0m
2026-05-22 CTN4486 SPU → ARN May 22, 05:05 UTCMay 22, 07:40 UTC2h 35m
2026-05-21 CTN423 DUS → SPU May 21, 16:25 UTCMay 21, 17:40 UTC1h 15m
2026-05-21 CTN422 SPU → DUS May 21, 13:40 UTCMay 21, 15:15 UTC1h 35m
2026-05-21 CTN513 DUB → ZAG May 21, 10:10 UTCMay 21, 12:25 UTC2h 15m
2026-05-21 CTN512 SPU → DUB May 21, 06:05 UTCMay 21, 08:55 UTC2h 50m
2026-05-20 CTN3501 SNN → ORK May 20, 17:15 UTCMay 20, 19:50 UTC2h 35m

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

Mode-S 501C42 frequently asked

What is Mode-S code 501C42?
501C42 is an ICAO 24-bit transponder address. Allocated to Croatia. Assigned to 9A-CAL.
Where is Mode-S 501C42 registered?
Mode-S code 501C42 is allocated to Croatia (HR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 501C42 broadcasting right now?
Yes. Mode-S 501C42 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 501C42, octal 24016102, decimal 5,250,114.
What flights does 501C42 operate?
Mode-S 501C42 has broadcast 20 distinct callsigns, including CTN3RC, CTN301, CTN9HR, CTN8A, CTN415.