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sensors Mode-S transponder

501C1A

ICAO 24-bit transponder address · allocated to Croatia

Currently assigned to 9A-DAD · CESSNA 172 Skyhawk

Hex
501C1A
Octal
24016032
Decimal
5,250,074
Country
HR
Tail
9A-DAD
Type
C172
No current signal · last broadcast 2h ago
Flights observed
86
Distinct callsigns
1
Country
HR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 501C1A.

Country allocation

The ICAO 24-bit address 501C1A 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
9ADAD - 85 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 9ADAD - Jul 22, 11:10 UTCJul 22, 11:30 UTC20m
2026-07-21 9ADAD - Jul 21, 13:40 UTCJul 21, 14:20 UTC40m
2026-07-21 9ADAD - Jul 21, 10:10 UTCJul 21, 11:30 UTC1h 20m
2026-07-21 9ADAD - Jul 21, 06:30 UTCJul 21, 08:50 UTC2h 20m
2026-06-19 9ADAD - Jun 19, 12:44 UTCJun 19, 14:24 UTC1h 40m
2026-06-19 9ADAD - Jun 19, 09:44 UTCJun 19, 12:04 UTC2h 20m
2026-06-19 9ADAD - Jun 19, 06:49 UTCJun 19, 07:34 UTC45m
2026-06-18 9ADAD - Jun 18, 12:25 UTCJun 18, 13:55 UTC1h 30m
2026-06-18 9ADAD - Jun 18, 08:45 UTCJun 18, 11:10 UTC2h 25m
2026-06-18 9ADAD - Jun 18, 06:50 UTCJun 18, 07:35 UTC45m
2026-06-17 9ADAD - Jun 17, 13:15 UTCJun 17, 14:45 UTC1h 30m
2026-06-17 9ADAD - Jun 17, 10:35 UTCJun 17, 10:50 UTC15m
2026-06-17 9ADAD - Jun 17, 08:25 UTCJun 17, 09:05 UTC40m
2026-06-17 9ADAD - Jun 17, 06:50 UTCJun 17, 07:30 UTC40m
2026-06-16 9ADAD - Jun 16, 11:20 UTCJun 16, 12:00 UTC40m
2026-06-16 9ADAD - Jun 16, 07:05 UTCJun 16, 08:35 UTC1h 30m
2026-06-15 9ADAD - Jun 15, 09:54 UTCJun 15, 11:15 UTC1h 20m
2026-06-15 9ADAD - Jun 15, 07:50 UTCJun 15, 08:49 UTC1h 0m
2026-06-12 9ADAD - Jun 12, 11:45 UTCJun 12, 12:40 UTC55m
2026-06-12 9ADAD - Jun 12, 09:25 UTCJun 12, 10:55 UTC1h 30m
2026-06-12 9ADAD - Jun 12, 06:40 UTCJun 12, 08:40 UTC2h 0m
2026-06-09 9ADAD - Jun 9, 16:45 UTCJun 9, 17:40 UTC55m
2026-06-09 9ADAD - Jun 9, 15:10 UTCJun 9, 15:30 UTC20m
2026-06-09 9ADAD - Jun 9, 13:20 UTCJun 9, 14:25 UTC1h 5m
2026-06-09 9ADAD - Jun 9, 10:10 UTCJun 9, 11:40 UTC1h 30m
2026-06-09 9ADAD - Jun 9, 06:45 UTCJun 9, 09:10 UTC2h 25m
2026-06-08 9ADAD - Jun 8, 11:45 UTCJun 8, 13:05 UTC1h 20m
2026-06-08 9ADAD - Jun 8, 09:30 UTCJun 8, 10:45 UTC1h 15m
2026-06-08 9ADAD - Jun 8, 07:00 UTCJun 8, 08:05 UTC1h 5m
2026-06-02 9ADAD - Jun 2, 11:20 UTCJun 2, 13:15 UTC1h 55m
2026-06-02 9ADAD - Jun 2, 08:25 UTCJun 2, 10:15 UTC1h 50m
2026-05-29 9ADAD - May 29, 09:55 UTCMay 29, 11:15 UTC1h 20m
2026-05-29 9ADAD - May 29, 07:30 UTCMay 29, 08:45 UTC1h 15m
2026-05-28 9ADAD - May 28, 12:05 UTCMay 28, 13:30 UTC1h 25m
2026-05-28 - - May 28, 08:00 UTCMay 28, 08:10 UTC10m
2026-05-28 9ADAD - May 28, 07:10 UTCMay 28, 07:20 UTC10m
2026-05-27 9ADAD - May 27, 15:05 UTCMay 27, 15:20 UTC15m
2026-05-27 9ADAD - May 27, 10:25 UTCMay 27, 10:45 UTC20m
2026-05-27 9ADAD - May 27, 08:25 UTCMay 27, 08:45 UTC20m
2026-05-27 9ADAD - May 27, 06:29 UTCMay 27, 06:55 UTC25m
2026-05-26 9ADAD - May 26, 14:00 UTCMay 26, 15:49 UTC1h 50m
2026-05-26 9ADAD - May 26, 11:20 UTCMay 26, 12:50 UTC1h 30m
2026-05-26 9ADAD - May 26, 07:55 UTCMay 26, 09:09 UTC1h 15m
2026-05-26 9ADAD - May 26, 06:59 UTCMay 26, 07:15 UTC15m
2026-05-25 9ADAD - May 25, 13:15 UTCMay 25, 14:05 UTC50m
2026-05-25 9ADAD - May 25, 11:25 UTCMay 25, 11:45 UTC20m
2026-05-25 9ADAD - May 25, 07:20 UTCMay 25, 08:30 UTC1h 10m
2026-05-21 9ADAD - May 21, 15:40 UTCMay 21, 16:45 UTC1h 5m
2026-05-21 9ADAD - May 21, 12:45 UTCMay 21, 14:25 UTC1h 40m
2026-05-21 9ADAD - May 21, 06:45 UTCMay 21, 08:50 UTC2h 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-DAD page for operator, model, and routing details .

Mode-S 501C1A frequently asked

What is Mode-S code 501C1A?
501C1A is an ICAO 24-bit transponder address. Allocated to Croatia. Assigned to 9A-DAD.
Where is Mode-S 501C1A registered?
Mode-S code 501C1A is allocated to Croatia (HR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 501C1A broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 501C1A, octal 24016032, decimal 5,250,074.
What flights does 501C1A operate?
Mode-S 501C1A has broadcast 1 distinct callsign, including 9ADAD.