Apparatus

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sensors Mode-S transponder

45CAA1

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-RUA · ATR-72-500

Hex
45CAA1
Octal
21345241
Decimal
4,573,857
Country
DK
Tail
OY-RUA
Type
AT75
No current signal · last broadcast 5h ago
Flights observed
374
Distinct callsigns
20
Country
DK
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 45CAA1.

Country allocation

The ICAO 24-bit address 45CAA1 falls within the block assigned to Denmark (DK) by ICAO Annex 10, Volume III. Every aircraft registered in Denmark 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
DTR198 - 54 2026-06-24
DTR197 - 53 2026-06-24
DTR194 DAT Danish Air Transport 40 2026-06-25
DTR193 - 38 2026-06-25
DTR192 - 34 2026-06-24
DTR191 - 34 2026-06-24
DTR1832 - 11 2026-07-14
DTR68A - 10 2026-07-14
DTR67H - 10 2026-07-14
DTR1826 - 10 2026-07-14
DTR1825 - 10 2026-07-14
DTR1836 - 9 2026-07-14
DTR69C - 8 2026-07-14
DTR1831 - 7 2026-07-14
DTR1828 - 7 2026-07-14
DTR1827 - 7 2026-07-14
DTR85M DAT Danish Air Transport 3 2026-07-06
DTR69V - 3 2026-07-12
DTR1901 - 3 2026-07-12
DTR1842 - 3 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DTR1825 PMO → PNL Jul 14, 17:35 UTCJul 14, 18:10 UTC35m
2026-07-14 DTR1826 - Jul 14, 15:55 UTCJul 14, 16:30 UTC35m
2026-07-14 DTR68A - Jul 14, 14:50 UTCJul 14, 15:15 UTC25m
2026-07-14 DTR1836 - Jul 14, 13:35 UTCJul 14, 13:55 UTC20m
2026-07-14 DTR1827 PMO → PNL Jul 14, 12:10 UTCJul 14, 12:50 UTC40m
2026-07-14 DTR1828 - Jul 14, 10:55 UTCJul 14, 11:20 UTC25m
2026-07-14 DTR67H - Jul 14, 09:30 UTCJul 14, 09:50 UTC20m
2026-07-14 DTR69C - Jul 14, 07:40 UTCJul 14, 08:15 UTC35m
2026-07-14 DTR1831 TPS → PNL Jul 14, 06:20 UTCJul 14, 06:55 UTC35m
2026-07-14 DTR1832 - Jul 14, 05:00 UTCJul 14, 05:30 UTC30m
2026-07-13 DTR1825 - Jul 13, 17:30 UTCJul 13, 18:05 UTC35m
2026-07-13 DTR1826 - Jul 13, 16:00 UTCJul 13, 16:35 UTC35m
2026-07-13 DTR68A - Jul 13, 14:40 UTCJul 13, 15:05 UTC25m
2026-07-13 DTR1836 - Jul 13, 13:35 UTCJul 13, 13:55 UTC20m
2026-07-13 DTR1827 - Jul 13, 12:05 UTCJul 13, 12:45 UTC40m
2026-07-13 DTR1828 - Jul 13, 10:35 UTCJul 13, 11:05 UTC30m
2026-07-13 DTR67H - Jul 13, 09:25 UTCJul 13, 09:45 UTC20m
2026-07-13 DTR1832 - Jul 13, 07:40 UTCJul 13, 08:10 UTC30m
2026-07-13 DTR1832 - Jul 13, 06:25 UTCJul 13, 06:55 UTC30m
2026-07-13 DTR1832 - Jul 13, 05:10 UTCJul 13, 05:40 UTC30m
2026-07-12 DTR68A - Jul 12, 18:15 UTCJul 12, 18:40 UTC25m
2026-07-12 DTR1836 - Jul 12, 17:10 UTCJul 12, 17:40 UTC30m
2026-07-12 DTR1825 - Jul 12, 16:01 UTCJul 12, 16:30 UTC30m
2026-07-12 DTR1826 - Jul 12, 14:25 UTCJul 12, 14:50 UTC25m
2026-07-12 DTR1901 - Jul 12, 12:40 UTCJul 12, 13:30 UTC50m
2026-07-12 DTR69V - Jul 12, 10:40 UTCJul 12, 11:25 UTC45m
2026-07-12 DTR67H TPS → PNL Jul 12, 09:25 UTCJul 12, 09:50 UTC25m
2026-07-12 DTR69C - Jul 12, 07:31 UTCJul 12, 08:05 UTC35m
2026-07-12 DTR1831 - Jul 12, 06:15 UTCJul 12, 06:45 UTC30m
2026-07-12 DTR1832 - Jul 12, 05:05 UTCJul 12, 05:35 UTC30m
2026-07-11 DTR1901 - Jul 11, 12:15 UTCJul 11, 13:00 UTC45m
2026-07-11 DTR67H - Jul 11, 10:30 UTCJul 11, 11:20 UTC50m
2026-07-11 DTR67H - Jul 11, 09:15 UTCJul 11, 09:50 UTC35m
2026-07-11 DTR69C - Jul 11, 07:40 UTCJul 11, 08:15 UTC35m
2026-07-11 DTR1831 - Jul 11, 06:25 UTCJul 11, 06:55 UTC30m
2026-07-11 DTR1832 - Jul 11, 05:10 UTCJul 11, 05:25 UTC15m
2026-07-10 DTR68A - Jul 10, 17:30 UTCJul 10, 18:00 UTC30m
2026-07-10 DTR1825 - Jul 10, 15:20 UTCJul 10, 16:50 UTC1h 30m
2026-07-10 DTR1826 - Jul 10, 13:45 UTCJul 10, 14:15 UTC30m
2026-07-10 DTR19O1 - Jul 10, 12:15 UTCJul 10, 13:00 UTC45m
2026-07-10 DTR69V - Jul 10, 10:25 UTCJul 10, 11:10 UTC45m
2026-07-10 DTR67H - Jul 10, 09:35 UTCJul 10, 09:45 UTC10m
2026-07-10 DTR69C - Jul 10, 07:40 UTCJul 10, 08:20 UTC40m
2026-07-10 DTR1831 TPS → PNL Jul 10, 06:20 UTCJul 10, 06:50 UTC30m
2026-07-10 DTR1832 - Jul 10, 05:10 UTCJul 10, 05:40 UTC30m
2026-07-09 DTR68A TPS → PNL Jul 9, 17:45 UTCJul 9, 18:15 UTC30m
2026-07-09 DTR1836 - Jul 9, 16:35 UTCJul 9, 17:05 UTC30m
2026-07-09 DTR1825 PMO → PNL Jul 9, 15:25 UTCJul 9, 16:05 UTC40m
2026-07-09 DTR1826 - Jul 9, 13:55 UTCJul 9, 14:30 UTC35m
2026-07-08 DTR1825 PMO → PNL Jul 8, 17:50 UTCJul 8, 18:20 UTC30m

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 OY-RUA page for operator, model, and routing details .

Mode-S 45CAA1 frequently asked

What is Mode-S code 45CAA1?
45CAA1 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-RUA.
Where is Mode-S 45CAA1 registered?
Mode-S code 45CAA1 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45CAA1 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45CAA1, octal 21345241, decimal 4,573,857.
What flights does 45CAA1 operate?
Mode-S 45CAA1 has broadcast 20 distinct callsigns, including DTR198, DTR197, DTR194, DTR193, DTR192.