Apparatus

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sensors Mode-S transponder

501C09

ICAO 24-bit transponder address · allocated to Croatia

Currently assigned to 9A-DDD · CESSNA 172 Skyhawk

Hex
501C09
Octal
24016011
Decimal
5,250,057
Country
HR
Tail
9A-DDD
Type
C172
No current signal · last broadcast 2d ago
Flights observed
55
Distinct callsigns
1
Country
HR
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 501C09.

Country allocation

The ICAO 24-bit address 501C09 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 1 distinct

Callsign Airline Flights Last seen
9ADDD - 55 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 9ADDD - Jul 15, 10:15 UTCJul 15, 11:10 UTC55m
2026-07-15 9ADDD - Jul 15, 08:50 UTCJul 15, 09:10 UTC20m
2026-07-12 9ADDD - Jul 12, 14:25 UTCJul 12, 14:40 UTC15m
2026-07-12 9ADDD - Jul 12, 07:50 UTCJul 12, 08:30 UTC40m
2026-07-11 9ADDD - Jul 11, 11:30 UTCJul 11, 11:45 UTC15m
2026-07-09 9ADDD - Jul 9, 10:15 UTCJul 9, 10:25 UTC10m
2026-07-08 9ADDD - Jul 8, 06:55 UTCJul 8, 07:20 UTC25m
2026-07-07 9ADDD - Jul 7, 07:00 UTCJul 7, 07:55 UTC55m
2026-07-05 9ADDD - Jul 5, 06:45 UTCJul 5, 06:55 UTC10m
2026-07-04 9ADDD - Jul 4, 09:35 UTCJul 4, 09:45 UTC10m
2026-07-04 9ADDD - Jul 4, 07:30 UTCJul 4, 07:45 UTC15m
2026-06-30 9ADDD - Jun 30, 06:55 UTCJun 30, 07:30 UTC35m
2026-06-27 9ADDD - Jun 27, 11:39 UTCJun 27, 12:09 UTC30m
2026-06-27 9ADDD - Jun 27, 06:54 UTCJun 27, 07:39 UTC45m
2026-06-25 9ADDD - Jun 25, 10:15 UTCJun 25, 11:15 UTC1h 0m
2026-06-20 9ADDD - Jun 20, 13:09 UTCJun 20, 13:55 UTC45m
2026-06-19 9ADDD - Jun 19, 16:59 UTCJun 19, 17:49 UTC50m
2026-06-18 9ADDD - Jun 18, 17:30 UTCJun 18, 18:05 UTC35m
2026-06-14 9ADDD - Jun 14, 12:15 UTCJun 14, 12:55 UTC40m
2026-06-14 9ADDD - Jun 14, 09:15 UTCJun 14, 09:25 UTC10m
2026-06-13 9ADDD - Jun 13, 09:20 UTCJun 13, 09:50 UTC30m
2026-06-12 9ADDD - Jun 12, 14:25 UTCJun 12, 15:10 UTC45m
2026-06-12 9ADDD - Jun 12, 10:55 UTCJun 12, 11:15 UTC20m
2026-06-11 9ADDD - Jun 11, 17:30 UTCJun 11, 18:15 UTC45m
2026-06-10 9ADDD - Jun 10, 10:50 UTCJun 10, 11:00 UTC10m
2026-06-09 9ADDD - Jun 9, 15:35 UTCJun 9, 15:45 UTC10m
2026-06-07 9ADDD - Jun 7, 10:30 UTCJun 7, 10:45 UTC15m
2026-06-04 9ADDD - Jun 4, 14:10 UTCJun 4, 14:55 UTC45m
2026-06-04 9ADDD - Jun 4, 10:10 UTCJun 4, 10:50 UTC40m
2026-06-02 9ADDD - Jun 2, 11:10 UTCJun 2, 11:25 UTC15m
2026-06-02 9ADDD - Jun 2, 09:25 UTCJun 2, 09:45 UTC20m
2026-05-31 9ADDD - May 31, 11:05 UTCMay 31, 12:00 UTC55m
2026-05-29 9ADDD - May 29, 17:35 UTCMay 29, 18:25 UTC50m
2026-05-29 9ADDD - May 29, 16:35 UTCMay 29, 16:45 UTC10m
2026-05-29 9ADDD - May 29, 12:55 UTCMay 29, 13:50 UTC55m
2026-05-26 9ADDD - May 26, 17:30 UTCMay 26, 17:39 UTC10m
2026-05-26 9ADDD - May 26, 10:54 UTCMay 26, 11:05 UTC10m
2026-05-26 9ADDD - May 26, 07:49 UTCMay 26, 08:04 UTC15m
2026-05-24 9ADDD - May 24, 07:20 UTCMay 24, 07:40 UTC20m
2026-05-23 9ADDD - May 23, 16:15 UTCMay 23, 16:30 UTC15m
2026-05-23 9ADDD - May 23, 12:00 UTCMay 23, 12:10 UTC10m
2026-05-09 9ADDD - May 9, 10:50 UTCMay 9, 11:00 UTC10m
2026-05-02 9ADDD - May 2, 14:45 UTCMay 2, 16:15 UTC1h 30m
2026-05-02 9ADDD - May 2, 08:25 UTCMay 2, 09:45 UTC1h 20m
2026-04-28 9ADDD - Apr 28, 16:30 UTCApr 28, 16:40 UTC10m
2026-04-26 9ADDD - Apr 26, 08:00 UTCApr 26, 08:20 UTC20m
2026-04-25 9ADDD - Apr 25, 17:00 UTCApr 25, 17:35 UTC35m
2026-04-25 9ADDD - Apr 25, 13:20 UTCApr 25, 14:20 UTC1h 0m
2026-04-23 9ADDD - Apr 23, 15:25 UTCApr 23, 16:05 UTC40m
2026-04-19 9ADDD - Apr 19, 07:30 UTCApr 19, 07:45 UTC15m

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

Mode-S 501C09 frequently asked

What is Mode-S code 501C09?
501C09 is an ICAO 24-bit transponder address. Allocated to Croatia. Assigned to 9A-DDD.
Where is Mode-S 501C09 registered?
Mode-S code 501C09 is allocated to Croatia (HR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 501C09 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 501C09, octal 24016011, decimal 5,250,057.
What flights does 501C09 operate?
Mode-S 501C09 has broadcast 1 distinct callsign, including 9ADDD.