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sensors Mode-S transponder

501C3B

ICAO 24-bit transponder address · allocated to Croatia

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

Hex
501C3B
Octal
24016073
Decimal
5,250,107
Country
HR
Tail
9A-CAI
Type
BCS1
No current signal · last broadcast Jul 26, 18:40 UTC
Flights observed
566
Distinct callsigns
20
Country
HR
Last broadcast
Jul 26, 18:40 UTC

Last known position

Most recent position reported by Mode-S 501C3B.

Country allocation

The ICAO 24-bit address 501C3B 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
CTN71F Croatia Airlines 17 2026-07-26
CTN480 Croatia Airlines 17 2026-07-17
CTN25F Croatia Airlines 17 2026-07-26
CTN481 - 16 2026-07-17
CTN381 - 16 2026-07-14
CTN380 - 16 2026-07-14
CTN5NL - 13 2026-07-14
CTN4AS - 13 2026-07-14
CTN5H - 12 2026-07-14
CTN415 - 12 2026-07-17
CTN414 - 12 2026-07-17
CTN486 - 11 2026-07-06
CTN475 Croatia Airlines 11 2026-07-26
CTN656 - 10 2026-07-13
CTN52R - 10 2026-07-26
CTN369 Croatia Airlines 10 2026-07-17
CTN368 Croatia Airlines 10 2026-07-17
CTN9HR Croatia Airlines 9 2026-07-25
CTN487 - 9 2026-07-06
CTN4456 Croatia Airlines 9 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CTN71F CDG → ZAG Jul 26, 17:00 UTCJul 26, 18:40 UTC1h 40m
2026-07-26 CTN52R - Jul 26, 13:40 UTCJul 26, 15:25 UTC1h 45m
2026-07-26 CTN475 CDG → SPU Jul 26, 10:20 UTCJul 26, 11:50 UTC1h 30m
2026-07-26 CTN25F ZAG → CDG Jul 26, 07:10 UTCJul 26, 08:45 UTC1h 35m
2026-07-25 CTN5P SPU → ZAG Jul 25, 20:20 UTCJul 25, 20:45 UTC25m
2026-07-25 CTN439 MUC → SPU Jul 25, 18:05 UTCJul 25, 18:50 UTC45m
2026-07-25 CTN438 SPU → MUC Jul 25, 16:10 UTCJul 25, 17:05 UTC55m
2026-07-25 CTN475V LYS → SPU Jul 25, 13:50 UTCJul 25, 14:55 UTC1h 5m
2026-07-25 CTN474V SPU → LYS Jul 25, 11:30 UTCJul 25, 12:50 UTC1h 20m
2026-07-25 CTN9HR FRA → ZAG Jul 25, 09:00 UTCJul 25, 10:10 UTC1h 10m
2026-07-25 CTN410 ZAG → FRA Jul 25, 05:50 UTCJul 25, 07:15 UTC1h 25m
2026-07-24 CTN495 LGW → SPU Jul 24, 16:00 UTCJul 24, 17:45 UTC1h 45m
2026-07-24 CTN494 SPU → LGW Jul 24, 12:30 UTCJul 24, 14:40 UTC2h 10m
2026-07-24 CTN4487 ARN → SPU Jul 24, 08:50 UTCJul 24, 10:45 UTC1h 55m
2026-07-24 CTN4486 SPU → ARN Jul 24, 05:10 UTCJul 24, 07:45 UTC2h 35m
2026-07-23 CTN423 DUS → SPU Jul 23, 16:50 UTCJul 23, 18:10 UTC1h 20m
2026-07-23 CTN422 SPU → DUS Jul 23, 13:50 UTCJul 23, 15:35 UTC1h 45m
2026-07-23 CTN513 DUB → ZAG Jul 23, 10:00 UTCJul 23, 12:25 UTC2h 25m
2026-07-23 CTN512 SPU → DUB Jul 23, 06:00 UTCJul 23, 08:45 UTC2h 45m
2026-07-22 CTN4357 - Jul 22, 19:35 UTCJul 22, 21:00 UTC1h 25m
2026-07-22 CTN4356 - Jul 22, 16:45 UTCJul 22, 18:05 UTC1h 20m
2026-07-22 CTN654 ZAG → SPU Jul 22, 14:25 UTCJul 22, 14:40 UTC15m
2026-07-22 CTN321 - Jul 22, 12:25 UTCJul 22, 13:05 UTC40m
2026-07-22 CTN320 ZAG → PRG Jul 22, 11:10 UTCJul 22, 11:15 UTC5m
2026-07-20 CTN494 SPU → LGW Jul 20, 12:30 UTCJul 20, 13:30 UTC1h 0m
2026-07-19 CTN4352 SPU → IST Jul 19, 20:15 UTCJul 19, 21:35 UTC1h 20m
2026-07-19 CTN4489 - Jul 19, 16:15 UTCJul 19, 18:40 UTC2h 25m
2026-07-19 CTN848R - Jul 19, 12:40 UTCJul 19, 15:00 UTC2h 20m
2026-07-19 CTN4487 ARN → SPU Jul 19, 08:50 UTCJul 19, 11:10 UTC2h 20m
2026-07-19 CTN4486 SPU → ARN Jul 19, 05:15 UTCJul 19, 07:25 UTC2h 10m
2026-07-18 CTN439 - Jul 18, 18:45 UTCJul 18, 19:30 UTC45m
2026-07-18 CTN438 SPU → MUC Jul 18, 16:05 UTCJul 18, 17:15 UTC1h 10m
2026-07-18 CTN475V LYS → SPU Jul 18, 13:25 UTCJul 18, 14:30 UTC1h 5m
2026-07-18 CTN474V SPU → LYS Jul 18, 11:05 UTCJul 18, 12:20 UTC1h 15m
2026-07-18 CTN9HR - Jul 18, 08:45 UTCJul 18, 09:50 UTC1h 5m
2026-07-18 CTN410 ZAG → FRA Jul 18, 05:35 UTCJul 18, 07:00 UTC1h 25m
2026-07-17 CTN415 - Jul 17, 20:29 UTCJul 17, 21:44 UTC1h 15m
2026-07-17 CTN414 - Jul 17, 17:05 UTCJul 17, 18:19 UTC1h 15m
2026-07-17 CTN369 SKP → ZAG Jul 17, 15:15 UTCJul 17, 16:04 UTC50m
2026-07-17 CTN368 ZAG → SKP Jul 17, 13:00 UTCJul 17, 13:40 UTC40m
2026-07-17 CTN481 - Jul 17, 09:50 UTCJul 17, 11:35 UTC1h 45m
2026-07-17 CTN480 ZAG → CPH Jul 17, 06:50 UTCJul 17, 08:25 UTC1h 35m
2026-07-17 CTN6B - Jul 17, 04:25 UTCJul 17, 04:59 UTC35m
2026-07-16 CTN664 - Jul 16, 21:25 UTCJul 16, 22:05 UTC40m
2026-07-16 CTN71F - Jul 16, 17:30 UTCJul 16, 18:59 UTC1h 30m
2026-07-16 CTN476 - Jul 16, 13:30 UTCJul 16, 15:55 UTC2h 25m
2026-07-16 CTN29F - Jul 16, 10:25 UTCJul 16, 12:09 UTC1h 45m
2026-07-16 CTN25F - Jul 16, 07:10 UTCJul 16, 09:05 UTC1h 55m
2026-07-16 CTN6B - Jul 16, 04:20 UTCJul 16, 04:55 UTC35m
2026-07-15 CTN29F - Jul 15, 18:40 UTCJul 15, 20:30 UTC1h 50m

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

Mode-S 501C3B frequently asked

What is Mode-S code 501C3B?
501C3B is an ICAO 24-bit transponder address. Allocated to Croatia. Assigned to 9A-CAI.
Where is Mode-S 501C3B registered?
Mode-S code 501C3B is allocated to Croatia (HR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 501C3B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 501C3B, octal 24016073, decimal 5,250,107.
What flights does 501C3B operate?
Mode-S 501C3B has broadcast 20 distinct callsigns, including CTN71F, CTN480, CTN25F, CTN481, CTN381.