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sensors Mode-S transponder

501D1D

ICAO 24-bit transponder address · allocated to Croatia

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

Hex
501D1D
Octal
24016435
Decimal
5,250,333
Country
HR
Tail
9A-CTH
Type
A319
Broadcasting now · callsign CTN37S · 39,000 ft
Flights observed
587
Distinct callsigns
20
Country
HR
Last broadcast
Jul 26, 21:15 UTC

Current position

501D1D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 501D1D 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
CTN27H Croatia Airlines 33 2026-07-26
CTN27D - 27 2026-07-21
CTN756C Croatia Airlines 20 2026-07-21
CTN756R Croatia Airlines 19 2026-07-21
CTN414 - 19 2026-07-23
CTN415 Croatia Airlines 18 2026-07-23
CTN381 Croatia Airlines 16 2026-07-24
CTN9HR - 15 2026-07-16
CTN380 - 15 2026-07-24
CTN416 Croatia Airlines 14 2026-07-26
CTN412 - 14 2026-07-19
CTN410 - 14 2026-07-16
CTN8A - 13 2026-07-23
CTN19H - 13 2026-07-19
CTN664 Croatia Airlines 12 2026-07-25
CTN6J Croatia Airlines 11 2026-07-23
CTN460 Croatia Airlines 11 2026-07-17
CTN6B Croatia Airlines 10 2026-07-26
CTN5H - 10 2026-06-25
CTN461 - 10 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CTN334E MUC → DBV Jul 26, 20:05 UTCJul 26, 21:15 UTC1h 10m
2026-07-26 CTN4432 DBV → MUC Jul 26, 17:50 UTCJul 26, 19:10 UTC1h 20m
2026-07-26 CTN29F CDG → DBV Jul 26, 15:05 UTCJul 26, 17:00 UTC1h 55m
2026-07-26 CTN476 DBV → CDG Jul 26, 11:55 UTCJul 26, 14:05 UTC2h 10m
2026-07-26 CTN27H FRA → DBV Jul 26, 09:35 UTCJul 26, 11:00 UTC1h 25m
2026-07-26 CTN416 ZAG → FRA Jul 26, 06:50 UTCJul 26, 08:05 UTC1h 15m
2026-07-26 CTN6B DBV → ZAG Jul 26, 04:35 UTCJul 26, 05:15 UTC40m
2026-07-25 CTN664 ZAG → DBV Jul 25, 20:55 UTCJul 25, 21:35 UTC40m
2026-07-25 CTN71F CDG → ZAG Jul 25, 17:20 UTCJul 25, 18:45 UTC1h 25m
2026-07-25 CTN52R - Jul 25, 13:40 UTCJul 25, 15:20 UTC1h 40m
2026-07-25 CTN475 CDG → SPU Jul 25, 10:20 UTCJul 25, 11:50 UTC1h 30m
2026-07-25 CTN25F ZAG → CDG Jul 25, 07:10 UTCJul 25, 08:45 UTC1h 35m
2026-07-24 CTN381 FCO → ZAG Jul 24, 19:40 UTCJul 24, 19:50 UTC10m
2026-07-24 CTN381 FCO → ZAG Jul 24, 17:45 UTCJul 24, 18:15 UTC30m
2026-07-24 CTN380 - Jul 24, 15:05 UTCJul 24, 15:40 UTC35m
2026-07-24 CTN380 - Jul 24, 13:30 UTCJul 24, 13:50 UTC20m
2026-07-24 CTN481 CPH → ZAG Jul 24, 09:40 UTCJul 24, 11:05 UTC1h 25m
2026-07-24 CTN480 ZAG → CPH Jul 24, 07:00 UTCJul 24, 08:45 UTC1h 45m
2026-07-23 CTN415 FRA → ZAG Jul 23, 19:10 UTCJul 23, 20:10 UTC1h 0m
2026-07-23 CTN414 - Jul 23, 16:10 UTCJul 23, 17:25 UTC1h 15m
2026-07-23 CTN6J DBV → ZAG Jul 23, 14:40 UTCJul 23, 15:15 UTC35m
2026-07-23 CTN8A - Jul 23, 12:55 UTCJul 23, 13:35 UTC40m
2026-07-23 CTN4AS AMS → ZAG Jul 23, 09:40 UTCJul 23, 11:05 UTC1h 25m
2026-07-23 CTN5NL ZAG → AMS Jul 23, 06:35 UTCJul 23, 08:20 UTC1h 45m
2026-07-22 CTN6D DBV → ZAG Jul 22, 11:30 UTCJul 22, 11:45 UTC15m
2026-07-22 CTN27H - Jul 22, 11:10 UTCJul 22, 11:25 UTC15m
2026-07-21 CTN756C ZRH → DBV Jul 21, 14:10 UTCJul 21, 15:20 UTC1h 10m
2026-07-21 CTN756R DBV → ZRH Jul 21, 11:35 UTCJul 21, 13:15 UTC1h 40m
2026-07-21 CTN27H FRA → DBV Jul 21, 08:45 UTCJul 21, 10:10 UTC1h 25m
2026-07-21 CTN27D DBV → FRA Jul 21, 05:30 UTCJul 21, 07:15 UTC1h 45m
2026-07-20 CTN756C ZRH → DBV Jul 20, 16:15 UTCJul 20, 17:05 UTC50m
2026-07-20 CTN756C ZRH → DBV Jul 20, 14:00 UTCJul 20, 15:15 UTC1h 15m
2026-07-20 CTN756R DBV → ZRH Jul 20, 11:25 UTCJul 20, 13:00 UTC1h 35m
2026-07-20 CTN27H FRA → DBV Jul 20, 09:05 UTCJul 20, 10:30 UTC1h 25m
2026-07-20 CTN27D - Jul 20, 05:35 UTCJul 20, 07:15 UTC1h 40m
2026-07-19 CTN664 ZAG → DBV Jul 19, 21:30 UTCJul 19, 22:10 UTC40m
2026-07-19 CTN415 FRA → ZAG Jul 19, 19:25 UTCJul 19, 20:15 UTC50m
2026-07-19 CTN414 - Jul 19, 16:35 UTCJul 19, 17:45 UTC1h 10m
2026-07-19 CTN19H - Jul 19, 14:30 UTCJul 19, 15:25 UTC55m
2026-07-19 CTN412 - Jul 19, 11:30 UTCJul 19, 12:45 UTC1h 15m
2026-07-19 CTN413 FRA → SPU Jul 19, 08:10 UTCJul 19, 09:15 UTC1h 5m
2026-07-19 CTN27D DBV → FRA Jul 19, 04:50 UTCJul 19, 06:30 UTC1h 40m
2026-07-18 CTN664 ZAG → DBV Jul 18, 21:00 UTCJul 18, 21:35 UTC35m
2026-07-18 CTN19H - Jul 18, 14:10 UTCJul 18, 15:10 UTC1h 0m
2026-07-18 CTN412 - Jul 18, 11:25 UTCJul 18, 12:45 UTC1h 20m
2026-07-18 CTN423 DUS → SPU Jul 18, 08:40 UTCJul 18, 10:00 UTC1h 20m
2026-07-18 CTN422 SPU → DUS Jul 18, 06:00 UTCJul 18, 07:35 UTC1h 35m
2026-07-18 CTN1W - Jul 18, 04:30 UTCJul 18, 04:50 UTC20m
2026-07-17 CTN381 - Jul 17, 18:15 UTCJul 17, 18:34 UTC20m
2026-07-17 CTN381 - Jul 17, 16:34 UTCJul 17, 17:05 UTC30m

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

Mode-S 501D1D frequently asked

What is Mode-S code 501D1D?
501D1D is an ICAO 24-bit transponder address. Allocated to Croatia. Assigned to 9A-CTH.
Where is Mode-S 501D1D registered?
Mode-S code 501D1D is allocated to Croatia (HR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 501D1D broadcasting right now?
Yes. Mode-S 501D1D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 501D1D, octal 24016435, decimal 5,250,333.
What flights does 501D1D operate?
Mode-S 501D1D has broadcast 20 distinct callsigns, including CTN27H, CTN27D, CTN756C, CTN756R, CTN414.