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sensors Mode-S transponder

501DD0

ICAO 24-bit transponder address · allocated to Croatia

Currently assigned to 9A-CQE · DE HAVILLAND DHC-8-400 Dash 8

Hex
501DD0
Octal
24016720
Decimal
5,250,512
Country
HR
Tail
9A-CQE
Type
DH8D
Broadcasting now · callsign CTN443 · 17,100 ft
Flights observed
372
Distinct callsigns
20
Country
HR
Last broadcast
13m ago

Current position

501DD0 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 501DD0 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
CTN3T Croatia Airlines 21 2026-06-11
CTN344 Croatia Airlines 21 2026-06-12
CTN345 Croatia Airlines 20 2026-06-12
CTN632 - 19 2026-06-10
CTN4AT Croatia Airlines 17 2026-06-15
CTN443 Croatia Airlines 17 2026-06-15
CTN441 Croatia Airlines 17 2026-06-15
CTN442 Croatia Airlines 15 2026-06-15
CTN6CH Croatia Airlines 13 2026-06-14
CTN465 Croatia Airlines 13 2026-06-14
CTN4W Croatia Airlines 12 2026-06-15
CTN436R Croatia Airlines 10 2026-06-12
CTN437 Croatia Airlines 9 2026-06-09
CTN436 Croatia Airlines 9 2026-06-09
CTN4437 Croatia Airlines 8 2026-06-12
CTN342 Croatia Airlines 8 2026-06-12
CTN341 Croatia Airlines 8 2026-06-13
CTN5N Croatia Airlines 7 2026-06-08
CTN327 - 7 2026-06-15
CTN326 Croatia Airlines 7 2026-06-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-15 CTN443 VIE → ZAG Jun 15, 17:50 UTCJun 15, 17:59 UTC10m
2026-06-15 CTN442 ZAG → VIE Jun 15, 16:15 UTCJun 15, 16:49 UTC35m
2026-06-15 CTN4Z PUY → ZAG Jun 15, 14:45 UTCJun 15, 15:04 UTC20m
2026-06-15 CTN4W ZAG → ZAD Jun 15, 13:40 UTCJun 15, 14:00 UTC20m
2026-06-15 CTN4W ZAG → ZAD Jun 15, 12:25 UTCJun 15, 13:00 UTC35m
2026-06-15 CTN441 VIE → ZAG Jun 15, 08:00 UTCJun 15, 08:29 UTC30m
2026-06-15 CTN4AT ZAG → VIE Jun 15, 06:15 UTCJun 15, 06:49 UTC35m
2026-06-15 CTN327 - Jun 15, 04:10 UTCJun 15, 04:40 UTC30m
2026-06-14 CTN326 ZAG → OMO Jun 14, 21:25 UTCJun 14, 21:55 UTC30m
2026-06-14 CTN465 ZRH → ZAG Jun 14, 18:15 UTCJun 14, 19:15 UTC1h 0m
2026-06-14 CTN6CH ZAG → ZRH Jun 14, 16:05 UTCJun 14, 17:10 UTC1h 5m
2026-06-14 CTN7Z ZAD → ZAG Jun 14, 14:30 UTCJun 14, 14:55 UTC25m
2026-06-14 CTN7T PUY → ZAD Jun 14, 13:30 UTCJun 14, 13:45 UTC15m
2026-06-14 CTN7T PUY → ZAD Jun 14, 12:25 UTCJun 14, 12:50 UTC25m
2026-06-14 CTN4409 BER → ZAG Jun 14, 09:10 UTCJun 14, 10:25 UTC1h 15m
2026-06-14 CTN4408 ZAG → BER Jun 14, 06:25 UTCJun 14, 08:00 UTC1h 35m
2026-06-13 CTN641 BWK → ZAG Jun 13, 15:15 UTCJun 13, 15:40 UTC25m
2026-06-13 CTN245T - Jun 13, 13:25 UTCJun 13, 14:00 UTC35m
2026-06-13 CTN442T - Jun 13, 11:30 UTCJun 13, 12:20 UTC50m
2026-06-13 CTN2449 - Jun 13, 09:30 UTCJun 13, 10:20 UTC50m
2026-06-13 CTN2448 - Jun 13, 07:35 UTCJun 13, 08:40 UTC1h 5m
2026-06-13 CTN640 ZAG → BWK Jun 13, 06:10 UTCJun 13, 06:35 UTC25m
2026-06-13 CTN341 SJJ → ZAG Jun 13, 04:30 UTCJun 13, 05:05 UTC35m
2026-06-12 CTN342 ZAG → SJJ Jun 12, 20:10 UTCJun 12, 20:30 UTC20m
2026-06-12 CTN443 VIE → ZAG Jun 12, 17:55 UTCJun 12, 18:25 UTC30m
2026-06-12 CTN442 ZAG → VIE Jun 12, 16:10 UTCJun 12, 16:40 UTC30m
2026-06-12 CTN345 SJJ → ZAG Jun 12, 14:10 UTCJun 12, 14:40 UTC30m
2026-06-12 CTN344 ZAG → SJJ Jun 12, 13:00 UTCJun 12, 13:25 UTC25m
2026-06-12 CTN4437 MUC → ZAG Jun 12, 08:40 UTCJun 12, 09:20 UTC40m
2026-06-12 CTN436R ZAG → MUC Jun 12, 06:30 UTCJun 12, 07:30 UTC1h 0m
2026-06-12 CTN327 OMO → ZAG Jun 12, 04:20 UTCJun 12, 04:45 UTC25m
2026-06-11 CTN326 ZAG → OMO Jun 11, 21:15 UTCJun 11, 21:40 UTC25m
2026-06-11 CTN465 ZRH → ZAG Jun 11, 18:45 UTCJun 11, 19:50 UTC1h 5m
2026-06-11 CTN6CH ZAG → ZRH Jun 11, 16:40 UTCJun 11, 17:55 UTC1h 15m
2026-06-11 CTN441 VIE → ZAG Jun 11, 07:55 UTCJun 11, 08:30 UTC35m
2026-06-11 CTN4AT ZAG → VIE Jun 11, 06:15 UTCJun 11, 06:50 UTC35m
2026-06-11 CTN3T PUY → ZAG Jun 11, 04:10 UTCJun 11, 05:15 UTC1h 5m
2026-06-10 CTN632 - Jun 10, 20:35 UTCJun 10, 21:05 UTC30m
2026-06-10 CTN632 - Jun 10, 19:30 UTCJun 10, 20:05 UTC35m
2026-06-10 CTN443 VIE → ZAG Jun 10, 17:50 UTCJun 10, 18:30 UTC40m
2026-06-10 CTN442 ZAG → VIE Jun 10, 15:55 UTCJun 10, 16:30 UTC35m
2026-06-10 CTN345 SJJ → ZAG Jun 10, 14:15 UTCJun 10, 14:40 UTC25m
2026-06-10 CTN344 ZAG → SJJ Jun 10, 13:05 UTCJun 10, 13:30 UTC25m
2026-06-10 CTN329 OMO → ZAG Jun 10, 11:15 UTCJun 10, 11:35 UTC20m
2026-06-10 CTN328 ZAG → OMO Jun 10, 09:40 UTCJun 10, 10:05 UTC25m
2026-06-10 CTN441 VIE → ZAG Jun 10, 07:55 UTCJun 10, 08:25 UTC30m
2026-06-10 CTN4AT ZAG → VIE Jun 10, 06:15 UTCJun 10, 06:55 UTC40m
2026-06-09 CTN437 MUC → ZAG Jun 9, 19:30 UTCJun 9, 20:20 UTC50m
2026-06-09 CTN436 ZAG → MUC Jun 9, 16:50 UTCJun 9, 17:45 UTC55m
2026-06-09 CTN345 SJJ → ZAG Jun 9, 14:35 UTCJun 9, 15:10 UTC35m

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

Mode-S 501DD0 frequently asked

What is Mode-S code 501DD0?
501DD0 is an ICAO 24-bit transponder address. Allocated to Croatia. Assigned to 9A-CQE.
Where is Mode-S 501DD0 registered?
Mode-S code 501DD0 is allocated to Croatia (HR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 501DD0 broadcasting right now?
Yes. Mode-S 501DD0 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 501DD0, octal 24016720, decimal 5,250,512.
What flights does 501DD0 operate?
Mode-S 501DD0 has broadcast 20 distinct callsigns, including CTN3T, CTN344, CTN345, CTN632, CTN4AT.