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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 Jul 26, 18:15 UTC
Flights observed
771
Distinct callsigns
20
Country
HR
Last broadcast
Jul 26, 18:15 UTC

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
CTN7T Croatia Airlines 68 2026-07-26
CTN436R Croatia Airlines 66 2026-07-26
CTN3T Croatia Airlines 66 2026-07-26
CTN632 - 65 2026-07-25
CTN4437 Croatia Airlines 62 2026-07-26
CTN7Z Croatia Airlines 31 2026-07-26
CTN4435 Croatia Airlines 30 2026-07-24
CTN4434 Croatia Airlines 29 2026-07-24
CTN4431 Croatia Airlines 28 2026-07-24
CTN4430 Croatia Airlines 28 2026-07-24
CTN385 Croatia Airlines 24 2026-07-25
CTN384 Croatia Airlines 24 2026-07-25
CTN4W Croatia Airlines 17 2026-07-15
CTN8W Croatia Airlines 15 2026-07-26
CTN625 - 15 2026-07-26
CTN626 Croatia Airlines 14 2026-07-20
CTN624 Croatia Airlines 14 2026-07-24
CTN437 - 14 2026-06-30
CTN6669 Croatia Airlines 13 2026-07-24
CTN5J Croatia Airlines 13 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CTN625 - Jul 26, 17:20 UTCJul 26, 18:15 UTC55m
2026-07-26 CTN8W ZAG → DBV Jul 26, 15:55 UTCJul 26, 16:45 UTC50m
2026-07-26 CTN7Z ZAD → ZAG Jul 26, 14:45 UTCJul 26, 14:55 UTC10m
2026-07-26 CTN7T PUY → ZAD Jul 26, 13:30 UTCJul 26, 13:45 UTC15m
2026-07-26 CTN7T PUY → ZAD Jul 26, 12:20 UTCJul 26, 12:50 UTC30m
2026-07-26 CTN4437 MUC → ZAG Jul 26, 08:40 UTCJul 26, 09:40 UTC1h 0m
2026-07-26 CTN436R ZAG → MUC Jul 26, 06:25 UTCJul 26, 07:35 UTC1h 11m
2026-07-26 CTN3T PUY → ZAG Jul 26, 05:10 UTCJul 26, 05:30 UTC20m
2026-07-26 CTN3T PUY → ZAG Jul 26, 04:10 UTCJul 26, 04:20 UTC10m
2026-07-25 CTN632 - Jul 25, 21:40 UTCJul 25, 22:00 UTC20m
2026-07-25 CTN632 - Jul 25, 20:30 UTCJul 25, 20:50 UTC20m
2026-07-25 CTN385 FCO → ZAG Jul 25, 19:05 UTCJul 25, 19:25 UTC20m
2026-07-25 CTN385 FCO → ZAG Jul 25, 18:20 UTCJul 25, 18:35 UTC15m
2026-07-25 CTN385 FCO → ZAG Jul 25, 16:35 UTCJul 25, 17:40 UTC1h 5m
2026-07-25 CTN384 ZAG → FCO Jul 25, 14:00 UTCJul 25, 15:25 UTC1h 25m
2026-07-25 CTN384 ZAG → FCO Jul 25, 12:25 UTCJul 25, 13:20 UTC55m
2026-07-25 CTN4437 MUC → ZAG Jul 25, 08:30 UTCJul 25, 09:30 UTC1h 0m
2026-07-25 CTN436R ZAG → MUC Jul 25, 06:20 UTCJul 25, 07:25 UTC1h 5m
2026-07-25 CTN3T PUY → ZAG Jul 25, 05:10 UTCJul 25, 05:35 UTC25m
2026-07-25 CTN3T PUY → ZAG Jul 25, 04:10 UTCJul 25, 04:20 UTC10m
2026-07-24 CTN632 - Jul 24, 20:25 UTCJul 24, 20:35 UTC10m
2026-07-24 CTN632 - Jul 24, 19:15 UTCJul 24, 19:30 UTC15m
2026-07-24 CTN6669 DBV → ZAG Jul 24, 16:15 UTCJul 24, 17:05 UTC50m
2026-07-24 CTN624 OSI → DBV Jul 24, 14:50 UTCJul 24, 15:35 UTC45m
2026-07-24 CTN4431 MUC → OSI Jul 24, 12:30 UTCJul 24, 13:55 UTC1h 25m
2026-07-24 CTN4434 RJK → MUC Jul 24, 10:30 UTCJul 24, 11:35 UTC1h 5m
2026-07-24 CTN4435 MUC → RJK Jul 24, 08:30 UTCJul 24, 09:20 UTC50m
2026-07-24 CTN4430 OSI → MUC Jul 24, 05:45 UTCJul 24, 07:20 UTC1h 35m
2026-07-23 CTN627 SPU → OSI Jul 23, 20:15 UTCJul 23, 20:40 UTC25m
2026-07-23 CTN1W - Jul 23, 18:30 UTCJul 23, 18:40 UTC10m
2026-07-23 CTN7T PUY → ZAD Jul 23, 13:40 UTCJul 23, 13:55 UTC15m
2026-07-23 CTN7T PUY → ZAD Jul 23, 12:25 UTCJul 23, 12:55 UTC30m
2026-07-23 CTN4437 MUC → ZAG Jul 23, 08:25 UTCJul 23, 09:25 UTC1h 0m
2026-07-23 CTN436R ZAG → MUC Jul 23, 06:25 UTCJul 23, 07:40 UTC1h 15m
2026-07-23 CTN3T PUY → ZAG Jul 23, 05:05 UTCJul 23, 05:20 UTC15m
2026-07-23 CTN3T PUY → ZAG Jul 23, 04:00 UTCJul 23, 04:10 UTC10m
2026-07-22 CTN632 - Jul 22, 21:00 UTCJul 22, 21:15 UTC15m
2026-07-22 CTN632 - Jul 22, 19:55 UTCJul 22, 20:15 UTC20m
2026-07-22 CTN443 VIE → ZAG Jul 22, 17:50 UTCJul 22, 18:30 UTC40m
2026-07-22 CTN442 - Jul 22, 16:00 UTCJul 22, 16:40 UTC40m
2026-07-22 CTN3T PUY → ZAG Jul 22, 05:05 UTCJul 22, 05:25 UTC20m
2026-07-22 CTN3T PUY → ZAG Jul 22, 04:05 UTCJul 22, 04:20 UTC15m
2026-07-21 CTN632 - Jul 21, 21:05 UTCJul 21, 21:30 UTC25m
2026-07-21 CTN632 - Jul 21, 20:05 UTCJul 21, 20:25 UTC20m
2026-07-21 CTN443 VIE → ZAG Jul 21, 17:55 UTCJul 21, 18:35 UTC40m
2026-07-21 CTN442 - Jul 21, 16:00 UTCJul 21, 16:40 UTC40m
2026-07-21 CTN7Z ZAD → ZAG Jul 21, 15:00 UTCJul 21, 15:10 UTC10m
2026-07-21 CTN7T PUY → ZAD Jul 21, 13:45 UTCJul 21, 14:00 UTC15m
2026-07-21 CTN7T PUY → ZAD Jul 21, 12:25 UTCJul 21, 13:00 UTC35m
2026-07-21 CTN4437 MUC → ZAG Jul 21, 08:45 UTCJul 21, 09:40 UTC55m

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 Jul 26, 18:15 UTC.
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 CTN7T, CTN436R, CTN3T, CTN632, CTN4437.