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sensors Mode-S transponder

501E83

ICAO 24-bit transponder address · allocated to Croatia

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

Hex
501E83
Octal
24017203
Decimal
5,250,691
Country
HR
Tail
9A-CTN
Type
A319
No current signal · last broadcast Jul 26, 21:50 UTC
Flights observed
573
Distinct callsigns
20
Country
HR
Last broadcast
Jul 26, 21:50 UTC

Last known position

Most recent position reported by Mode-S 501E83.

Country allocation

The ICAO 24-bit address 501E83 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
CTN412 - 26 2026-07-24
CTN19H - 26 2026-07-24
CTN413 Croatia Airlines 25 2026-07-24
CTN416 Croatia Airlines 23 2026-07-24
CTN71F - 20 2026-07-14
CTN25F - 18 2026-07-14
CTN6B Croatia Airlines 17 2026-07-19
CTN29F - 15 2026-07-14
CTN8A - 14 2026-07-18
CTN664 - 14 2026-07-02
CTN5H - 14 2026-07-17
CTN476 - 14 2026-07-14
CTN27D - 14 2026-07-18
CTN656 - 12 2026-07-16
CTN481 Croatia Airlines 12 2026-07-23
CTN480 Croatia Airlines 12 2026-07-23
CTN27H - 12 2026-07-18
CTN72E Croatia Airlines 11 2026-07-25
CTN5NL Croatia Airlines 11 2026-07-18
CTN4AS - 11 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CTN5V SPU → ZAG Jul 26, 21:25 UTCJul 26, 21:50 UTC25m
2026-07-26 CTN4HV VIE → SPU Jul 26, 18:15 UTCJul 26, 18:50 UTC35m
2026-07-26 CTN4AU SPU → VIE Jul 26, 16:35 UTCJul 26, 17:15 UTC40m
2026-07-26 CTN395 MXP → SPU Jul 26, 13:50 UTCJul 26, 14:40 UTC50m
2026-07-26 CTN394 SPU → MXP Jul 26, 11:30 UTCJul 26, 12:30 UTC1h 0m
2026-07-26 CTN39PR MUC → SPU Jul 26, 09:25 UTCJul 26, 10:10 UTC45m
2026-07-26 CTN438P SPU → MUC Jul 26, 06:25 UTCJul 26, 07:15 UTC51m
2026-07-25 CTN32CZ PRG → SPU Jul 25, 18:05 UTCJul 25, 18:55 UTC50m
2026-07-25 CTN4324 SPU → PRG Jul 25, 16:15 UTCJul 25, 17:15 UTC1h 0m
2026-07-25 CTN2S ZAG → SPU Jul 25, 14:05 UTCJul 25, 14:15 UTC10m
2026-07-25 CTN375 BCN → ZAG Jul 25, 09:10 UTCJul 25, 10:45 UTC1h 35m
2026-07-25 CTN72E ZAG → BCN Jul 25, 05:55 UTCJul 25, 07:45 UTC1h 50m
2026-07-24 CTN19H - Jul 24, 16:25 UTCJul 24, 17:20 UTC55m
2026-07-24 CTN412 - Jul 24, 13:00 UTCJul 24, 14:15 UTC1h 15m
2026-07-24 CTN413 FRA → SPU Jul 24, 10:30 UTCJul 24, 11:25 UTC55m
2026-07-24 CTN416 ZAG → FRA Jul 24, 07:10 UTCJul 24, 08:30 UTC1h 20m
2026-07-23 CTN381 - Jul 23, 19:00 UTCJul 23, 19:25 UTC25m
2026-07-23 CTN381 - Jul 23, 17:15 UTCJul 23, 17:45 UTC30m
2026-07-23 CTN380 - Jul 23, 14:45 UTCJul 23, 15:20 UTC35m
2026-07-23 CTN380 - Jul 23, 13:00 UTCJul 23, 13:15 UTC15m
2026-07-23 CTN481 CPH → ZAG Jul 23, 09:30 UTCJul 23, 10:55 UTC1h 25m
2026-07-23 CTN480 ZAG → CPH Jul 23, 06:50 UTCJul 23, 08:20 UTC1h 30m
2026-07-22 CTN3203 - Jul 22, 21:05 UTCJul 22, 22:25 UTC1h 20m
2026-07-22 CTN3202 - Jul 22, 18:15 UTCJul 22, 19:40 UTC1h 25m
2026-07-22 CTN19H - Jul 22, 16:15 UTCJul 22, 17:10 UTC55m
2026-07-22 CTN412 - Jul 22, 13:10 UTCJul 22, 14:40 UTC1h 30m
2026-07-22 CTN413 FRA → SPU Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-21 CTN375 BCN → ZAG Jul 21, 10:10 UTCJul 21, 11:30 UTC1h 20m
2026-07-21 CTN72E ZAG → BCN Jul 21, 06:00 UTCJul 21, 08:10 UTC2h 10m
2026-07-20 CTN19H - Jul 20, 16:15 UTCJul 20, 17:10 UTC55m
2026-07-20 CTN412 - Jul 20, 13:15 UTCJul 20, 14:50 UTC1h 35m
2026-07-20 CTN413 FRA → SPU Jul 20, 10:25 UTCJul 20, 11:35 UTC1h 10m
2026-07-20 CTN416 - Jul 20, 07:10 UTCJul 20, 08:20 UTC1h 10m
2026-07-20 CTN78M SKP → ZAG Jul 20, 03:35 UTCJul 20, 04:30 UTC55m
2026-07-19 CTN366 - Jul 19, 21:45 UTCJul 19, 22:25 UTC40m
2026-07-19 CTN301 - Jul 19, 19:25 UTCJul 19, 20:00 UTC35m
2026-07-19 CTN301 ATH → DBV Jul 19, 17:25 UTCJul 19, 18:35 UTC1h 10m
2026-07-19 CTN3RC DBV → ATH Jul 19, 15:00 UTCJul 19, 16:00 UTC1h 0m
2026-07-19 CTN3RC - Jul 19, 13:20 UTCJul 19, 13:55 UTC35m
2026-07-19 CTN4409 BER → ZAG Jul 19, 09:55 UTCJul 19, 11:00 UTC1h 5m
2026-07-19 CTN4408 ZAG → BER Jul 19, 06:50 UTCJul 19, 07:55 UTC1h 5m
2026-07-19 CTN6B DBV → ZAG Jul 19, 04:15 UTCJul 19, 04:55 UTC40m
2026-07-18 CTN27H FRA → DBV Jul 18, 17:20 UTCJul 18, 18:45 UTC1h 25m
2026-07-18 CTN27D DBV → FRA Jul 18, 14:10 UTCJul 18, 16:00 UTC1h 50m
2026-07-18 CTN8A - Jul 18, 12:35 UTCJul 18, 13:10 UTC35m
2026-07-18 CTN4AS - Jul 18, 09:50 UTCJul 18, 11:10 UTC1h 20m
2026-07-18 CTN5NL ZAG → AMS Jul 18, 06:50 UTCJul 18, 08:30 UTC1h 40m
2026-07-17 CTN19H - Jul 17, 17:15 UTCJul 17, 18:15 UTC1h 0m
2026-07-17 CTN412 - Jul 17, 13:10 UTCJul 17, 14:35 UTC1h 25m
2026-07-17 CTN413 - Jul 17, 10:25 UTCJul 17, 11:30 UTC1h 5m

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

Mode-S 501E83 frequently asked

What is Mode-S code 501E83?
501E83 is an ICAO 24-bit transponder address. Allocated to Croatia. Assigned to 9A-CTN.
Where is Mode-S 501E83 registered?
Mode-S code 501E83 is allocated to Croatia (HR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 501E83 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 501E83, octal 24017203, decimal 5,250,691.
What flights does 501E83 operate?
Mode-S 501E83 has broadcast 20 distinct callsigns, including CTN412, CTN19H, CTN413, CTN416, CTN71F.