Apparatus

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sensors Mode-S transponder

501C5E

ICAO 24-bit transponder address · allocated to Croatia

Currently assigned to 9A-ATR · ATR-72-600

Hex
501C5E
Octal
24016136
Decimal
5,250,142
Country
HR
Tail
9A-ATR
Type
AT76
No current signal · last broadcast 4h ago
Flights observed
329
Distinct callsigns
20
Country
HR
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 501C5E.

Country allocation

The ICAO 24-bit address 501C5E 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
CTN436R Croatia Airlines 32 2026-05-28
CTN7T Croatia Airlines 28 2026-05-28
CTN4437 Croatia Airlines 28 2026-05-28
CTN632 - 21 2026-05-29
CTN3T Croatia Airlines 20 2026-05-24
CTN7Z Croatia Airlines 14 2026-05-28
CTN4435 Croatia Airlines 14 2026-05-29
CTN4434 Croatia Airlines 14 2026-05-29
CTN4431 Croatia Airlines 14 2026-05-29
CTN4430 Croatia Airlines 13 2026-05-29
CTN384 Croatia Airlines 10 2026-05-23
CTN437 Croatia Airlines 9 2026-05-27
CTN385 Croatia Airlines 9 2026-05-23
CTN624 Croatia Airlines 8 2026-05-29
CTN436 Croatia Airlines 8 2026-05-27
CTN6669 Croatia Airlines 7 2026-05-29
CTN8W Croatia Airlines 6 2026-05-24
CTN626 Croatia Airlines 6 2026-05-25
CTN625 - 6 2026-05-24
CTN5J Croatia Airlines 6 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CTN632 - May 29, 20:45 UTCMay 29, 21:05 UTC20m
2026-05-29 CTN632 - May 29, 19:40 UTCMay 29, 20:10 UTC30m
2026-05-29 CTN6669 DBV → ZAG May 29, 16:45 UTCMay 29, 17:40 UTC55m
2026-05-29 CTN624 OSI → DBV May 29, 15:05 UTCMay 29, 15:50 UTC45m
2026-05-29 CTN4431 MUC → OSI May 29, 12:50 UTCMay 29, 14:10 UTC1h 20m
2026-05-29 CTN4434 RJK → MUC May 29, 10:25 UTCMay 29, 11:35 UTC1h 10m
2026-05-29 CTN4435 MUC → RJK May 29, 08:45 UTCMay 29, 09:40 UTC55m
2026-05-29 CTN4430 OSI → MUC May 29, 06:00 UTCMay 29, 07:40 UTC1h 40m
2026-05-28 CTN627 SPU → OSI May 28, 17:45 UTCMay 28, 18:15 UTC30m
2026-05-28 CTN1W ZAG → SPU May 28, 16:15 UTCMay 28, 16:45 UTC30m
2026-05-28 CTN7Z ZAD → ZAG May 28, 15:05 UTCMay 28, 15:20 UTC15m
2026-05-28 CTN7T PUY → ZAD May 28, 13:45 UTCMay 28, 14:05 UTC20m
2026-05-28 CTN7T PUY → ZAD May 28, 12:25 UTCMay 28, 13:00 UTC35m
2026-05-28 CTN4437 MUC → ZAG May 28, 08:45 UTCMay 28, 09:40 UTC55m
2026-05-28 CTN436R ZAG → MUC May 28, 06:20 UTCMay 28, 07:40 UTC1h 20m
2026-05-27 CTN437 MUC → ZAG May 27, 19:35 UTCMay 27, 20:30 UTC55m
2026-05-27 CTN436 ZAG → MUC May 27, 16:55 UTCMay 27, 18:00 UTC1h 5m
2026-05-27 CTN345 SJJ → ZAG May 27, 14:45 UTCMay 27, 15:25 UTC40m
2026-05-27 CTN344 ZAG → SJJ May 27, 13:25 UTCMay 27, 13:55 UTC30m
2026-05-27 CTN461 ZRH → ZAG May 27, 10:55 UTCMay 27, 12:20 UTC1h 25m
2026-05-27 CTN460 ZAG → ZRH May 27, 08:10 UTCMay 27, 09:50 UTC1h 40m
2026-05-26 CTN7Z ZAD → ZAG May 26, 14:40 UTCMay 26, 15:00 UTC20m
2026-05-26 CTN7T PUY → ZAD May 26, 13:29 UTCMay 26, 13:50 UTC20m
2026-05-26 CTN7T PUY → ZAD May 26, 12:24 UTCMay 26, 12:50 UTC25m
2026-05-26 CTN4437 MUC → ZAG May 26, 08:45 UTCMay 26, 09:40 UTC55m
2026-05-26 CTN436R ZAG → MUC May 26, 06:25 UTCMay 26, 07:29 UTC1h 5m
2026-05-25 CTN5J SPU → ZAG May 25, 16:40 UTCMay 25, 17:05 UTC25m
2026-05-25 CTN626 OSI → SPU May 25, 15:05 UTCMay 25, 15:30 UTC25m
2026-05-25 CTN4431 MUC → OSI May 25, 12:45 UTCMay 25, 14:10 UTC1h 25m
2026-05-25 CTN4434 RJK → MUC May 25, 10:30 UTCMay 25, 11:45 UTC1h 15m
2026-05-25 CTN4435 MUC → RJK May 25, 08:35 UTCMay 25, 09:30 UTC55m
2026-05-25 CTN4430 OSI → MUC May 25, 06:00 UTCMay 25, 07:30 UTC1h 30m
2026-05-24 CTN625 - May 24, 17:40 UTCMay 24, 18:25 UTC45m
2026-05-24 CTN8W ZAG → DBV May 24, 16:00 UTCMay 24, 16:55 UTC55m
2026-05-24 CTN4437 MUC → ZAG May 24, 08:35 UTCMay 24, 09:30 UTC55m
2026-05-24 CTN436R ZAG → MUC May 24, 06:30 UTCMay 24, 07:40 UTC1h 10m
2026-05-24 CTN3T PUY → ZAG May 24, 05:10 UTCMay 24, 05:30 UTC20m
2026-05-24 CTN3T PUY → ZAG May 24, 04:05 UTCMay 24, 04:30 UTC25m
2026-05-23 CTN632 - May 23, 21:35 UTCMay 23, 21:50 UTC15m
2026-05-23 CTN632 - May 23, 20:30 UTCMay 23, 21:00 UTC30m
2026-05-23 CTN385 FCO → ZAG May 23, 17:15 UTCMay 23, 19:10 UTC1h 56m
2026-05-23 CTN384 ZAG → FCO May 23, 14:00 UTCMay 23, 15:10 UTC1h 10m
2026-05-23 CTN384 ZAG → FCO May 23, 12:15 UTCMay 23, 13:10 UTC55m
2026-05-23 CTN4437 MUC → ZAG May 23, 08:45 UTCMay 23, 09:40 UTC55m
2026-05-23 CTN436R ZAG → MUC May 23, 06:20 UTCMay 23, 07:25 UTC1h 5m
2026-05-23 CTN3T PUY → ZAG May 23, 05:10 UTCMay 23, 05:20 UTC10m
2026-05-23 CTN3T PUY → ZAG May 23, 04:00 UTCMay 23, 04:25 UTC25m
2026-05-22 CTN632 - May 22, 21:25 UTCMay 22, 21:35 UTC10m
2026-05-22 CTN632 - May 22, 20:05 UTCMay 22, 20:35 UTC30m
2026-05-22 CTN6669 DBV → ZAG May 22, 18:05 UTCMay 22, 18:55 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 9A-ATR page for operator, model, and routing details .

Mode-S 501C5E frequently asked

What is Mode-S code 501C5E?
501C5E is an ICAO 24-bit transponder address. Allocated to Croatia. Assigned to 9A-ATR.
Where is Mode-S 501C5E registered?
Mode-S code 501C5E is allocated to Croatia (HR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 501C5E 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 501C5E, octal 24016136, decimal 5,250,142.
What flights does 501C5E operate?
Mode-S 501C5E has broadcast 20 distinct callsigns, including CTN436R, CTN7T, CTN4437, CTN632, CTN3T.