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sensors Mode-S transponder

501D18

ICAO 24-bit transponder address · allocated to Croatia

Currently assigned to 9A-CTG · AIRBUS A-319

Hex
501D18
Octal
24016430
Decimal
5,250,328
Country
HR
Tail
9A-CTG
Type
A319
No current signal · last broadcast Jul 26, 19:55 UTC
Flights observed
618
Distinct callsigns
20
Country
HR
Last broadcast
Jul 26, 19:55 UTC

Last known position

Most recent position reported by Mode-S 501D18.

Country allocation

The ICAO 24-bit address 501D18 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
CTN664 Croatia Airlines 21 2026-07-24
CTN27D - 19 2026-07-17
CTN5NL Croatia Airlines 17 2026-07-26
CTN4AS Croatia Airlines 17 2026-07-26
CTN380 - 17 2026-07-06
CTN27H - 17 2026-07-17
CTN381 - 16 2026-07-06
CTN6B - 15 2026-07-05
CTN9HR Croatia Airlines 14 2026-07-23
CTN756R - 13 2026-07-17
CTN756C Croatia Airlines 13 2026-07-17
CTN656 Croatia Airlines 13 2026-07-23
CTN410 Croatia Airlines 13 2026-07-23
CTN19H Croatia Airlines 13 2026-06-23
CTN6CH - 11 2026-07-15
CTN5H Croatia Airlines 11 2026-07-24
CTN465 - 11 2026-07-15
CTN415 Croatia Airlines 11 2026-07-20
CTN414 - 11 2026-07-20
CTN412 - 11 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CTN437 MUC → ZAG Jul 26, 19:20 UTCJul 26, 19:55 UTC35m
2026-07-26 CTN436 ZAG → MUC Jul 26, 17:10 UTCJul 26, 17:55 UTC45m
2026-07-26 CTN4AS AMS → ZAG Jul 26, 09:40 UTCJul 26, 11:00 UTC1h 20m
2026-07-26 CTN5NL ZAG → AMS Jul 26, 06:30 UTCJul 26, 08:10 UTC1h 41m
2026-07-25 CTN461 ZRH → ZAG Jul 25, 10:00 UTCJul 25, 10:55 UTC55m
2026-07-25 CTN460 ZAG → ZRH Jul 25, 07:50 UTCJul 25, 09:05 UTC1h 15m
2026-07-25 CTN6D DBV → ZAG Jul 25, 05:45 UTCJul 25, 06:30 UTC45m
2026-07-24 CTN664 ZAG → DBV Jul 24, 21:10 UTCJul 24, 21:55 UTC45m
2026-07-24 CTN4409 BER → ZAG Jul 24, 19:05 UTCJul 24, 20:00 UTC55m
2026-07-24 CTN4408 ZAG → BER Jul 24, 16:45 UTCJul 24, 18:00 UTC1h 15m
2026-07-24 CTN6J DBV → ZAG Jul 24, 15:10 UTCJul 24, 15:40 UTC30m
2026-07-24 CTN8A - Jul 24, 13:45 UTCJul 24, 14:20 UTC35m
2026-07-24 CTN6H - Jul 24, 11:40 UTCJul 24, 12:15 UTC35m
2026-07-24 CTN8Y ZAG → DBV Jul 24, 10:00 UTCJul 24, 10:45 UTC45m
2026-07-24 CTN5H SPU → ZAG Jul 24, 04:30 UTCJul 24, 04:45 UTC15m
2026-07-23 CTN656 ZAG → SPU Jul 23, 20:35 UTCJul 23, 20:45 UTC10m
2026-07-23 CTN5N - Jul 23, 12:00 UTCJul 23, 12:10 UTC10m
2026-07-23 CTN2S ZAG → SPU Jul 23, 10:35 UTCJul 23, 10:45 UTC10m
2026-07-23 CTN9HR FRA → ZAG Jul 23, 08:40 UTCJul 23, 09:35 UTC55m
2026-07-23 CTN410 ZAG → FRA Jul 23, 05:50 UTCJul 23, 07:00 UTC1h 10m
2026-07-22 CTN6L DBV → ZAG Jul 22, 11:55 UTCJul 22, 12:25 UTC30m
2026-07-22 CTN456 ZAG → BRU Jul 22, 05:10 UTCJul 22, 05:25 UTC15m
2026-07-21 CTN9HR FRA → ZAG Jul 21, 08:30 UTCJul 21, 09:25 UTC55m
2026-07-21 CTN410 ZAG → FRA Jul 21, 05:45 UTCJul 21, 07:00 UTC1h 15m
2026-07-20 CTN415 FRA → ZAG Jul 20, 19:30 UTCJul 20, 20:25 UTC55m
2026-07-20 CTN414 - Jul 20, 17:25 UTCJul 20, 18:40 UTC1h 15m
2026-07-20 CTN5R SPU → ZAG Jul 20, 16:20 UTCJul 20, 16:30 UTC10m
2026-07-20 CTN654 ZAG → SPU Jul 20, 14:40 UTCJul 20, 15:05 UTC25m
2026-07-20 CTN481 - Jul 20, 09:50 UTCJul 20, 11:15 UTC1h 25m
2026-07-20 CTN480 ZAG → CPH Jul 20, 07:10 UTCJul 20, 08:40 UTC1h 30m
2026-07-19 CTN4HV VIE → SPU Jul 19, 18:30 UTCJul 19, 19:10 UTC40m
2026-07-19 CTN4AU - Jul 19, 16:40 UTCJul 19, 17:25 UTC45m
2026-07-19 CTN395 - Jul 19, 14:30 UTCJul 19, 15:15 UTC45m
2026-07-19 CTN394 - Jul 19, 11:55 UTCJul 19, 12:55 UTC1h 0m
2026-07-19 CTN39PR - Jul 19, 09:55 UTCJul 19, 10:35 UTC40m
2026-07-19 CTN438P ZAD → MUC Jul 19, 06:30 UTCJul 19, 07:25 UTC55m
2026-07-18 CTN4HV VIE → SPU Jul 18, 20:55 UTCJul 18, 21:35 UTC40m
2026-07-18 CTN4AU - Jul 18, 18:45 UTCJul 18, 19:30 UTC45m
2026-07-18 CTN32CZ PRG → SPU Jul 18, 16:20 UTCJul 18, 17:25 UTC1h 5m
2026-07-18 CTN4324 SPU → PRG Jul 18, 14:35 UTCJul 18, 15:35 UTC1h 0m
2026-07-18 CTN2S ZAG → SPU Jul 18, 12:50 UTCJul 18, 13:05 UTC15m
2026-07-18 CTN461 - Jul 18, 10:00 UTCJul 18, 10:50 UTC50m
2026-07-18 CTN460 ZAG → ZRH Jul 18, 07:55 UTCJul 18, 09:05 UTC1h 10m
2026-07-18 CTN6D DBV → ZAG Jul 18, 06:20 UTCJul 18, 07:00 UTC40m
2026-07-17 CTN756C ZRH → DBV Jul 17, 14:24 UTCJul 17, 15:40 UTC1h 15m
2026-07-17 CTN756R DBV → ZRH Jul 17, 11:50 UTCJul 17, 13:20 UTC1h 30m
2026-07-17 CTN27H FRA → DBV Jul 17, 09:10 UTCJul 17, 10:40 UTC1h 30m
2026-07-17 CTN27D DBV → FRA Jul 17, 06:15 UTCJul 17, 07:50 UTC1h 35m
2026-07-16 CTN4327 PRG → DBV Jul 16, 18:50 UTCJul 16, 20:00 UTC1h 10m
2026-07-16 CTN4326 DBV → PRG Jul 16, 16:30 UTCJul 16, 18:00 UTC1h 30m

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

Mode-S 501D18 frequently asked

What is Mode-S code 501D18?
501D18 is an ICAO 24-bit transponder address. Allocated to Croatia. Assigned to 9A-CTG.
Where is Mode-S 501D18 registered?
Mode-S code 501D18 is allocated to Croatia (HR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 501D18 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 501D18, octal 24016430, decimal 5,250,328.
What flights does 501D18 operate?
Mode-S 501D18 has broadcast 20 distinct callsigns, including CTN664, CTN27D, CTN5NL, CTN4AS, CTN380.