Apparatus

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sensors Mode-S transponder

506FD9

ICAO 24-bit transponder address · allocated to Slovenia

Hex
506FD9
Octal
24067731
Decimal
5,271,513
Country
SI
No current signal · last broadcast 1d ago
Flights observed
165
Distinct callsigns
2
Country
SI
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 506FD9.

Country allocation

The ICAO 24-bit address 506FD9 falls within the block assigned to Slovenia (SI) by ICAO Annex 10, Volume III. Every aircraft registered in Slovenia 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 2 distinct

Callsign Airline Flights Last seen
S5DUG - 159 2026-07-16
SPDAR - 6 2026-04-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 S5DUG GRZ → GRZ Jul 16, 19:30 UTCJul 16, 21:19 UTC1h 50m
2026-07-13 S5DUG GRZ → GRZ Jul 13, 19:40 UTCJul 13, 21:15 UTC1h 35m
2026-07-13 S5DUG MBX → GRZ Jul 13, 17:50 UTCJul 13, 18:15 UTC25m
2026-07-13 S5DUG - Jul 13, 13:55 UTCJul 13, 14:40 UTC45m
2026-07-10 S5DUG - Jul 10, 16:20 UTCJul 10, 17:00 UTC40m
2026-07-10 S5DUG - Jul 10, 14:20 UTCJul 10, 15:40 UTC1h 20m
2026-07-10 S5DUG - Jul 10, 06:50 UTCJul 10, 07:25 UTC35m
2026-07-09 S5DUG - Jul 9, 13:25 UTCJul 9, 14:10 UTC45m
2026-07-09 S5DUG - Jul 9, 11:05 UTCJul 9, 11:20 UTC15m
2026-07-08 S5DUG - Jul 8, 10:10 UTCJul 8, 11:05 UTC55m
2026-07-08 S5DUG - Jul 8, 07:15 UTCJul 8, 08:15 UTC1h 0m
2026-07-07 S5DUG - Jul 7, 11:00 UTCJul 7, 11:50 UTC50m
2026-07-07 S5DUG - Jul 7, 07:10 UTCJul 7, 09:00 UTC1h 50m
2026-07-06 S5DUG - Jul 6, 13:55 UTCJul 6, 14:50 UTC55m
2026-07-06 S5DUG - Jul 6, 10:35 UTCJul 6, 12:20 UTC1h 45m
2026-07-06 S5DUG - Jul 6, 07:40 UTCJul 6, 08:45 UTC1h 5m
2026-07-05 S5DUG - Jul 5, 09:40 UTCJul 5, 09:50 UTC10m
2026-07-03 S5DUG - Jul 3, 16:10 UTCJul 3, 16:35 UTC25m
2026-07-03 S5DUG - Jul 3, 14:55 UTCJul 3, 15:35 UTC40m
2026-07-03 S5DUG - Jul 3, 12:20 UTCJul 3, 13:05 UTC45m
2026-07-03 S5DUG - Jul 3, 10:15 UTCJul 3, 11:50 UTC1h 35m
2026-07-03 S5DUG - Jul 3, 07:05 UTCJul 3, 09:05 UTC2h 0m
2026-07-02 S5DUG - Jul 2, 15:45 UTCJul 2, 17:20 UTC1h 35m
2026-07-02 S5DUG - Jul 2, 07:15 UTCJul 2, 07:55 UTC40m
2026-07-01 S5DUG - Jul 1, 10:35 UTCJul 1, 11:30 UTC55m
2026-07-01 S5DUG - Jul 1, 08:00 UTCJul 1, 08:50 UTC50m
2026-06-30 S5DUG - Jun 30, 16:05 UTCJun 30, 17:10 UTC1h 5m
2026-06-30 S5DUG - Jun 30, 12:50 UTCJun 30, 14:30 UTC1h 40m
2026-06-30 S5DUG - Jun 30, 09:30 UTCJun 30, 10:35 UTC1h 5m
2026-06-30 S5DUG - Jun 30, 08:00 UTCJun 30, 08:40 UTC40m
2026-06-30 S5DUG - Jun 30, 06:40 UTCJun 30, 07:25 UTC45m
2026-06-29 S5DUG - Jun 29, 12:29 UTCJun 29, 14:04 UTC1h 35m
2026-06-29 S5DUG - Jun 29, 08:44 UTCJun 29, 11:04 UTC2h 20m
2026-06-29 S5DUG - Jun 29, 07:09 UTCJun 29, 07:55 UTC45m
2026-06-26 S5DUG - Jun 26, 09:24 UTCJun 26, 11:05 UTC1h 40m
2026-06-26 S5DUG - Jun 26, 07:14 UTCJun 26, 08:50 UTC1h 35m
2026-06-24 S5DUG - Jun 24, 15:49 UTCJun 24, 16:29 UTC40m
2026-06-24 S5DUG - Jun 24, 14:24 UTCJun 24, 15:05 UTC40m
2026-06-24 S5DUG - Jun 24, 12:20 UTCJun 24, 13:54 UTC1h 35m
2026-06-24 S5DUG - Jun 24, 09:15 UTCJun 24, 11:29 UTC2h 15m
2026-06-24 S5DUG - Jun 24, 07:54 UTCJun 24, 08:09 UTC15m
2026-06-24 S5DUG - Jun 24, 06:55 UTCJun 24, 07:10 UTC15m
2026-06-23 S5DUG - Jun 23, 14:35 UTCJun 23, 15:19 UTC45m
2026-06-23 S5DUG - Jun 23, 11:35 UTCJun 23, 13:59 UTC2h 25m
2026-06-23 S5DUG - Jun 23, 08:45 UTCJun 23, 10:49 UTC2h 5m
2026-06-23 S5DUG - Jun 23, 07:09 UTCJun 23, 07:49 UTC40m
2026-06-22 S5DUG - Jun 22, 15:50 UTCJun 22, 17:40 UTC1h 50m
2026-06-22 S5DUG - Jun 22, 12:19 UTCJun 22, 12:54 UTC35m
2026-06-22 S5DUG - Jun 22, 10:44 UTCJun 22, 11:35 UTC50m
2026-06-22 S5DUG - Jun 22, 08:40 UTCJun 22, 09:30 UTC50m

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.

Mode-S 506FD9 frequently asked

What is Mode-S code 506FD9?
506FD9 is an ICAO 24-bit transponder address. Allocated to Slovenia.
Where is Mode-S 506FD9 registered?
Mode-S code 506FD9 is allocated to Slovenia (SI). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 506FD9 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 506FD9, octal 24067731, decimal 5,271,513.
What flights does 506FD9 operate?
Mode-S 506FD9 has broadcast 2 distinct callsigns, including S5DUG, SPDAR.