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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 7h ago
Flights observed
659
Distinct callsigns
20
Country
HR
Last broadcast
7h 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 - 58 2026-07-12
CTN7T Croatia Airlines 56 2026-07-12
CTN4437 - 54 2026-07-12
CTN3T - 50 2026-07-12
CTN632 - 49 2026-07-11
CTN7Z Croatia Airlines 27 2026-07-12
CTN4435 - 27 2026-07-13
CTN4434 - 26 2026-07-13
CTN4431 Croatia Airlines 25 2026-07-13
CTN4430 - 25 2026-07-13
CTN384 - 20 2026-07-11
CTN385 - 19 2026-07-11
CTN4W Croatia Airlines 15 2026-07-08
CTN437 - 14 2026-06-30
CTN8W - 13 2026-07-12
CTN626 Croatia Airlines 13 2026-07-13
CTN625 - 13 2026-07-12
CTN436 - 13 2026-06-30
CTN624 Croatia Airlines 12 2026-07-03
CTN5J Croatia Airlines 12 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CTN5J SPU → ZAG Jul 13, 20:20 UTCJul 13, 20:30 UTC10m
2026-07-13 CTN626 OSI → SPU Jul 13, 18:20 UTCJul 13, 18:50 UTC30m
2026-07-13 CTN4431 MUC → OSI Jul 13, 12:55 UTCJul 13, 14:20 UTC1h 25m
2026-07-13 CTN4434 - Jul 13, 10:35 UTCJul 13, 11:50 UTC1h 15m
2026-07-13 CTN4435 - Jul 13, 08:40 UTCJul 13, 09:35 UTC55m
2026-07-13 CTN4430 - Jul 13, 06:01 UTCJul 13, 07:40 UTC1h 40m
2026-07-12 CTN625 - Jul 12, 17:55 UTCJul 12, 18:45 UTC50m
2026-07-12 CTN8W - Jul 12, 16:15 UTCJul 12, 17:15 UTC1h 0m
2026-07-12 CTN7Z ZAD → ZAG Jul 12, 15:01 UTCJul 12, 15:10 UTC10m
2026-07-12 CTN7T PUY → ZAD Jul 12, 13:45 UTCJul 12, 14:05 UTC20m
2026-07-12 CTN7T PUY → ZAD Jul 12, 12:30 UTCJul 12, 12:55 UTC25m
2026-07-12 CTN4437 - Jul 12, 08:40 UTCJul 12, 09:40 UTC1h 0m
2026-07-12 CTN436R - Jul 12, 06:25 UTCJul 12, 07:40 UTC1h 15m
2026-07-12 CTN3T - Jul 12, 05:15 UTCJul 12, 05:25 UTC10m
2026-07-12 CTN3T - Jul 12, 04:05 UTCJul 12, 04:15 UTC10m
2026-07-11 CTN632 - Jul 11, 22:25 UTCJul 11, 22:50 UTC25m
2026-07-11 CTN632 - Jul 11, 21:10 UTCJul 11, 21:30 UTC20m
2026-07-11 CTN385 - Jul 11, 19:10 UTCJul 11, 20:05 UTC55m
2026-07-11 CTN385 FCO → DBV Jul 11, 16:50 UTCJul 11, 18:05 UTC1h 15m
2026-07-11 CTN384 - Jul 11, 13:55 UTCJul 11, 15:15 UTC1h 20m
2026-07-11 CTN384 - Jul 11, 12:20 UTCJul 11, 13:10 UTC50m
2026-07-11 CTN4437 - Jul 11, 08:35 UTCJul 11, 09:30 UTC55m
2026-07-11 CTN436R - Jul 11, 06:25 UTCJul 11, 07:35 UTC1h 10m
2026-07-10 CTN4431 MUC → OSI Jul 10, 14:30 UTCJul 10, 15:30 UTC1h 0m
2026-07-10 CTN4434 - Jul 10, 11:55 UTCJul 10, 13:10 UTC1h 15m
2026-07-10 CTN4435 - Jul 10, 09:55 UTCJul 10, 10:55 UTC1h 0m
2026-07-10 CTN4430 - Jul 10, 07:05 UTCJul 10, 08:50 UTC1h 45m
2026-07-09 CTN627 SPU → OSI Jul 9, 20:20 UTCJul 9, 20:50 UTC30m
2026-07-09 CTN1W - Jul 9, 18:35 UTCJul 9, 18:50 UTC15m
2026-07-09 CTN7Z ZAD → ZAG Jul 9, 14:50 UTCJul 9, 15:15 UTC25m
2026-07-09 CTN7T PUY → ZAD Jul 9, 13:30 UTCJul 9, 13:45 UTC15m
2026-07-09 CTN7T PUY → ZAD Jul 9, 12:20 UTCJul 9, 12:50 UTC30m
2026-07-09 CTN4437 - Jul 9, 08:40 UTCJul 9, 09:30 UTC50m
2026-07-09 CTN436R - Jul 9, 06:30 UTCJul 9, 07:40 UTC1h 10m
2026-07-09 CTN3T - Jul 9, 05:20 UTCJul 9, 05:30 UTC10m
2026-07-09 CTN3T - Jul 9, 04:10 UTCJul 9, 04:20 UTC10m
2026-07-08 CTN632 - Jul 8, 20:30 UTCJul 8, 20:45 UTC15m
2026-07-08 CTN632 - Jul 8, 19:25 UTCJul 8, 19:45 UTC20m
2026-07-08 CTN443 VIE → ZAG Jul 8, 17:50 UTCJul 8, 18:25 UTC35m
2026-07-08 CTN442 - Jul 8, 15:55 UTCJul 8, 16:35 UTC40m
2026-07-08 CTN4Z PUY → ZAG Jul 8, 14:30 UTCJul 8, 14:50 UTC20m
2026-07-08 CTN4W ZAG → ZAD Jul 8, 13:40 UTCJul 8, 13:50 UTC10m
2026-07-08 CTN4W ZAG → ZAD Jul 8, 12:20 UTCJul 8, 12:45 UTC25m
2026-07-08 CTN3T - Jul 8, 05:15 UTCJul 8, 05:40 UTC25m
2026-07-08 CTN3T - Jul 8, 04:00 UTCJul 8, 04:15 UTC15m
2026-07-07 CTN632 - Jul 7, 21:35 UTCJul 7, 21:50 UTC15m
2026-07-07 CTN632 - Jul 7, 20:15 UTCJul 7, 20:30 UTC15m
2026-07-07 CTN443 VIE → ZAG Jul 7, 18:10 UTCJul 7, 18:45 UTC35m
2026-07-07 CTN442 - Jul 7, 16:25 UTCJul 7, 17:05 UTC40m
2026-07-07 CTN7Z ZAD → ZAG Jul 7, 14:35 UTCJul 7, 14:40 UTC5m

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 7h 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, CTN3T, CTN632.