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sensors Mode-S transponder

505DC2

ICAO 24-bit transponder address · allocated to Slovakia

Currently assigned to OM-NDB · CESSNA 560XL Citation XLS

Hex
505DC2
Octal
24056702
Decimal
5,266,882
Country
SK
Tail
OM-NDB
Type
C56X
No current signal · last broadcast 15h ago
Flights observed
146
Distinct callsigns
2
Country
SK
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 505DC2.

Country allocation

The ICAO 24-bit address 505DC2 falls within the block assigned to Slovakia (SK) by ICAO Annex 10, Volume III. Every aircraft registered in Slovakia 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
TTJ777 - 141 2026-07-17
OMNDB - 5 2026-06-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 TTJ777 - Jul 17, 15:25 UTCJul 17, 16:29 UTC1h 5m
2026-07-17 TTJ777 - Jul 17, 14:00 UTCJul 17, 14:50 UTC50m
2026-07-17 TTJ777 - Jul 17, 06:50 UTCJul 17, 07:25 UTC35m
2026-07-17 TTJ777 - Jul 17, 05:39 UTCJul 17, 06:00 UTC20m
2026-07-15 TTJ777 - Jul 15, 15:25 UTCJul 15, 16:10 UTC45m
2026-07-15 TTJ777 - Jul 15, 13:20 UTCJul 15, 14:15 UTC55m
2026-07-14 TTJ777 - Jul 14, 14:05 UTCJul 14, 14:25 UTC20m
2026-07-14 TTJ777 - Jul 14, 11:15 UTCJul 14, 13:05 UTC1h 50m
2026-07-14 TTJ777 - Jul 14, 02:20 UTCJul 14, 04:00 UTC1h 40m
2026-07-13 TTJ777 - Jul 13, 10:35 UTCJul 13, 10:50 UTC15m
2026-07-13 TTJ777 - Jul 13, 09:15 UTCJul 13, 09:40 UTC25m
2026-07-10 TTJ777 - Jul 10, 14:40 UTCJul 10, 15:00 UTC20m
2026-07-10 TTJ777 - Jul 10, 13:10 UTCJul 10, 13:35 UTC25m
2026-07-09 TTJ777 - Jul 9, 10:15 UTCJul 9, 11:15 UTC1h 0m
2026-07-09 TTJ777 - Jul 9, 08:15 UTCJul 9, 09:15 UTC1h 0m
2026-07-05 TTJ777 - Jul 5, 19:05 UTCJul 5, 19:25 UTC20m
2026-07-05 TTJ777 - Jul 5, 16:25 UTCJul 5, 17:50 UTC1h 25m
2026-07-05 TTJ777 - Jul 5, 14:20 UTCJul 5, 15:50 UTC1h 30m
2026-07-05 TTJ777 - Jul 5, 11:15 UTCJul 5, 12:45 UTC1h 30m
2026-07-03 TTJ777 - Jul 3, 13:00 UTCJul 3, 13:35 UTC35m
2026-07-03 TTJ777 VCE → FMO Jul 3, 08:15 UTCJul 3, 09:40 UTC1h 25m
2026-07-03 TTJ777 - Jul 3, 05:30 UTCJul 3, 06:00 UTC30m
2026-07-02 TTJ777 - Jul 2, 07:30 UTCJul 2, 08:45 UTC1h 15m
2026-07-02 TTJ777 - Jul 2, 04:55 UTCJul 2, 05:45 UTC50m
2026-07-01 TTJ777 - Jul 1, 15:55 UTCJul 1, 17:20 UTC1h 25m
2026-06-29 TTJ777 - Jun 29, 18:30 UTCJun 29, 19:00 UTC30m
2026-06-29 TTJ777 - Jun 29, 16:35 UTCJun 29, 17:34 UTC1h 0m
2026-06-29 TTJ777 - Jun 29, 14:09 UTCJun 29, 15:24 UTC1h 15m
2026-06-28 TTJ777 - Jun 28, 09:50 UTCJun 28, 10:19 UTC30m
2026-06-28 TTJ777 - Jun 28, 08:34 UTCJun 28, 08:55 UTC20m
2026-06-28 TTJ777 - Jun 28, 06:34 UTCJun 28, 07:54 UTC1h 20m
2026-06-28 TTJ777 - Jun 28, 03:09 UTCJun 28, 04:20 UTC1h 10m
2026-06-27 TTJ777 - Jun 27, 13:30 UTCJun 27, 13:55 UTC25m
2026-06-26 TTJ777 - Jun 26, 16:39 UTCJun 26, 17:50 UTC1h 10m
2026-06-26 TTJ777 - Jun 26, 14:35 UTCJun 26, 15:39 UTC1h 5m
2026-06-26 TTJ777 - Jun 26, 09:35 UTCJun 26, 10:20 UTC45m
2026-06-26 TTJ777 - Jun 26, 06:45 UTCJun 26, 07:30 UTC45m
2026-06-25 OMNDB - Jun 25, 15:44 UTCJun 25, 15:59 UTC15m
2026-06-25 OMNDB - Jun 25, 13:45 UTCJun 25, 14:20 UTC35m
2026-06-25 OMNDB - Jun 25, 12:19 UTCJun 25, 12:44 UTC25m
2026-06-20 TTJ777 - Jun 20, 08:55 UTCJun 20, 09:34 UTC40m
2026-06-20 TTJ777 - Jun 20, 07:24 UTCJun 20, 07:49 UTC25m
2026-06-20 TTJ777 - Jun 20, 04:49 UTCJun 20, 05:34 UTC45m
2026-06-19 TTJ777 - Jun 19, 13:24 UTCJun 19, 13:44 UTC20m
2026-06-19 TTJ777 - Jun 19, 11:39 UTCJun 19, 12:09 UTC30m
2026-06-19 OMNDB - Jun 19, 08:44 UTCJun 19, 08:59 UTC15m
2026-06-19 OMNDB - Jun 19, 08:04 UTCJun 19, 08:14 UTC10m
2026-06-17 TTJ777 - Jun 17, 10:50 UTCJun 17, 12:10 UTC1h 20m
2026-06-16 TTJ777 - Jun 16, 19:30 UTCJun 16, 22:55 UTC3h 26m
2026-06-16 TTJ777 - Jun 16, 16:35 UTCJun 16, 18:15 UTC1h 40m

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 OM-NDB page for operator, model, and routing details .

Mode-S 505DC2 frequently asked

What is Mode-S code 505DC2?
505DC2 is an ICAO 24-bit transponder address. Allocated to Slovakia. Assigned to OM-NDB.
Where is Mode-S 505DC2 registered?
Mode-S code 505DC2 is allocated to Slovakia (SK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 505DC2 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 505DC2, octal 24056702, decimal 5,266,882.
What flights does 505DC2 operate?
Mode-S 505DC2 has broadcast 2 distinct callsigns, including TTJ777, OMNDB.