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 Jul 26, 19:40 UTC
Flights observed
449
Distinct callsigns
20
Country
DK
Last broadcast
Jul 26, 19:40 UTC

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
DTR68A DAT Danish Air Transport 20 2026-07-26
DTR1825 DAT Danish Air Transport 20 2026-07-26
DTR1826 DAT Danish Air Transport 19 2026-07-26
DTR1836 DAT Danish Air Transport 18 2026-07-26
DTR1832 DAT Danish Air Transport 18 2026-07-21
DTR67H DAT Danish Air Transport 15 2026-07-20
DTR69C DAT Danish Air Transport 14 2026-07-21
DTR1831 DAT Danish Air Transport 12 2026-07-21
DTR1828 DAT Danish Air Transport 10 2026-07-21
DTR1827 DAT Danish Air Transport 10 2026-07-21
DTR69V DAT Danish Air Transport 5 2026-07-19
DTR1901 DAT Danish Air Transport 5 2026-07-19
DTR85M DAT Danish Air Transport 3 2026-07-06
DTR1842 - 3 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DTR68A TPS → PNL Jul 26, 19:05 UTCJul 26, 19:40 UTC35m
2026-07-26 DTR1836 PNL → TPS Jul 26, 17:50 UTCJul 26, 18:20 UTC30m
2026-07-26 DTR1825 PMO → PNL Jul 26, 16:35 UTCJul 26, 17:10 UTC35m
2026-07-26 DTR1826 PNL → PMO Jul 26, 14:45 UTCJul 26, 15:30 UTC45m
2026-07-25 DTR68A TPS → PNL Jul 25, 17:50 UTCJul 25, 18:15 UTC25m
2026-07-25 DTR1836 PNL → TPS Jul 25, 16:40 UTCJul 25, 17:05 UTC25m
2026-07-25 DTR1825 PMO → PNL Jul 25, 15:20 UTCJul 25, 15:50 UTC30m
2026-07-25 DTR1826 PNL → PMO Jul 25, 13:50 UTCJul 25, 14:15 UTC25m
2026-07-24 DTR68A TPS → PNL Jul 24, 18:05 UTCJul 24, 18:30 UTC25m
2026-07-24 DTR1825 PMO → PNL Jul 24, 16:50 UTCJul 24, 17:20 UTC30m
2026-07-24 DTR1825 PMO → PNL Jul 24, 15:50 UTCJul 24, 16:15 UTC25m
2026-07-24 DTR1826 PNL → PMO Jul 24, 13:50 UTCJul 24, 14:30 UTC40m
2026-07-24 DNU958 SRP → OSL Jul 24, 09:40 UTCJul 24, 11:15 UTC1h 35m
2026-07-23 DTR1713 LIN → AOI Jul 23, 20:15 UTCJul 23, 21:10 UTC55m
2026-07-23 DTR1714 AOI → LIN Jul 23, 17:55 UTCJul 23, 18:55 UTC1h 0m
2026-07-23 DNU952 - Jul 23, 15:00 UTCJul 23, 16:55 UTC1h 55m
2026-07-21 DTR1825 - Jul 21, 18:20 UTCJul 21, 18:40 UTC20m
2026-07-21 DTR1826 - Jul 21, 16:50 UTCJul 21, 17:20 UTC30m
2026-07-21 DTR68A - Jul 21, 15:45 UTCJul 21, 16:00 UTC15m
2026-07-21 DTR1836 PNL → TPS Jul 21, 14:05 UTCJul 21, 14:25 UTC20m
2026-07-21 DTR1827 PMO → PNL Jul 21, 12:45 UTCJul 21, 13:15 UTC30m
2026-07-21 DTR1828 PNL → PMO Jul 21, 10:40 UTCJul 21, 10:50 UTC10m
2026-07-21 DTR69C PNL → PMO Jul 21, 07:45 UTCJul 21, 08:20 UTC35m
2026-07-21 DTR1831 TPS → PNL Jul 21, 06:30 UTCJul 21, 06:45 UTC15m
2026-07-21 DTR1832 PNL → TPS Jul 21, 05:10 UTCJul 21, 05:25 UTC15m
2026-07-20 DTR1825 - Jul 20, 17:30 UTCJul 20, 18:05 UTC35m
2026-07-20 DTR1826 - Jul 20, 16:10 UTCJul 20, 16:45 UTC35m
2026-07-20 DTR68A - Jul 20, 15:00 UTCJul 20, 15:25 UTC25m
2026-07-20 DTR1836 PNL → TPS Jul 20, 13:55 UTCJul 20, 14:25 UTC30m
2026-07-20 DTR1827 PMO → PNL Jul 20, 12:30 UTCJul 20, 13:05 UTC35m
2026-07-20 DTR1828 PNL → PMO Jul 20, 11:05 UTCJul 20, 11:40 UTC35m
2026-07-20 DTR67H PMO → PNL Jul 20, 10:00 UTCJul 20, 10:10 UTC10m
2026-07-20 DTR69C PNL → PMO Jul 20, 07:45 UTCJul 20, 08:20 UTC35m
2026-07-20 DTR1831 TPS → PNL Jul 20, 06:35 UTCJul 20, 06:45 UTC10m
2026-07-20 DTR1832 - Jul 20, 05:10 UTCJul 20, 05:25 UTC15m
2026-07-19 DTR68A - Jul 19, 18:00 UTCJul 19, 18:10 UTC10m
2026-07-19 DTR1836 PNL → TPS Jul 19, 16:45 UTCJul 19, 17:10 UTC25m
2026-07-19 DTR1825 - Jul 19, 15:40 UTCJul 19, 16:00 UTC20m
2026-07-19 DTR1826 - Jul 19, 14:00 UTCJul 19, 14:40 UTC40m
2026-07-19 DTR1901 CTA → PNL Jul 19, 12:25 UTCJul 19, 13:20 UTC55m
2026-07-19 DTR69V PNL → CTA Jul 19, 10:40 UTCJul 19, 11:25 UTC45m
2026-07-19 DTR67H PMO → PNL Jul 19, 09:30 UTCJul 19, 09:55 UTC25m
2026-07-19 DTR69C PNL → PMO Jul 19, 07:45 UTCJul 19, 08:25 UTC40m
2026-07-19 DTR1831 TPS → PNL Jul 19, 06:25 UTCJul 19, 06:50 UTC25m
2026-07-19 DTR1832 - Jul 19, 05:05 UTCJul 19, 05:25 UTC20m
2026-07-18 DTR68A TPS → PNL Jul 18, 18:30 UTCJul 18, 18:55 UTC25m
2026-07-18 DTR1836 PNL → TPS Jul 18, 17:15 UTCJul 18, 17:45 UTC30m
2026-07-18 DTR1825 - Jul 18, 15:40 UTCJul 18, 16:25 UTC45m
2026-07-18 DTR1826 PNL → PMO Jul 18, 14:00 UTCJul 18, 14:45 UTC45m
2026-07-18 DTR1901 CTA → PNL Jul 18, 12:30 UTCJul 18, 13:20 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.

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 Jul 26, 19:40 UTC.
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.