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 11h ago
Flights observed
162
Distinct callsigns
6
Country
DK
Last broadcast
11h 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 6 distinct

Callsign Airline Flights Last seen
DTR198 DAT Danish Air Transport 36 2026-05-29
DTR197 DAT Danish Air Transport 34 2026-05-29
DTR194 DAT Danish Air Transport 25 2026-05-29
DTR193 DAT Danish Air Transport 23 2026-05-29
DTR192 DAT Danish Air Transport 22 2026-05-27
DTR191 DAT Danish Air Transport 22 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 DTR198 FRA → LNZ May 29, 19:00 UTCMay 29, 20:05 UTC1h 5m
2026-05-29 DTR197 LNZ → FRA May 29, 15:40 UTCMay 29, 16:45 UTC1h 5m
2026-05-29 DTR194 FRA → LNZ May 29, 12:35 UTCMay 29, 13:40 UTC1h 5m
2026-05-29 DTR193 LNZ → FRA May 29, 10:00 UTCMay 29, 11:15 UTC1h 15m
2026-05-28 DTR198 FRA → LNZ May 28, 17:30 UTCMay 28, 18:40 UTC1h 10m
2026-05-28 DTR197 LNZ → FRA May 28, 15:05 UTCMay 28, 16:20 UTC1h 15m
2026-05-28 DTR194 FRA → LNZ May 28, 12:20 UTCMay 28, 13:30 UTC1h 10m
2026-05-28 DTR193 LNZ → FRA May 28, 09:55 UTCMay 28, 11:05 UTC1h 10m
2026-05-27 DTR198 FRA → LNZ May 27, 18:35 UTCMay 27, 19:40 UTC1h 5m
2026-05-27 DTR197 LNZ → FRA May 27, 16:10 UTCMay 27, 17:25 UTC1h 15m
2026-05-27 DTR192 FRA → LNZ May 27, 06:44 UTCMay 27, 07:45 UTC1h 0m
2026-05-27 DTR191 LNZ → FRA May 27, 04:24 UTCMay 27, 05:45 UTC1h 20m
2026-05-26 DTR198 FRA → LNZ May 26, 18:10 UTCMay 26, 19:20 UTC1h 10m
2026-05-26 DTR197 LNZ → FRA May 26, 15:39 UTCMay 26, 16:59 UTC1h 20m
2026-05-26 DTR192 FRA → LNZ May 26, 07:15 UTCMay 26, 08:19 UTC1h 5m
2026-05-26 DTR191 LNZ → FRA May 26, 04:20 UTCMay 26, 05:34 UTC1h 15m
2026-05-25 DTR194 FRA → LNZ May 25, 12:20 UTCMay 25, 13:30 UTC1h 10m
2026-05-25 DTR193 LNZ → FRA May 25, 09:45 UTCMay 25, 10:55 UTC1h 10m
2026-05-25 DTR192 FRA → LNZ May 25, 06:35 UTCMay 25, 07:40 UTC1h 5m
2026-05-25 DTR191 LNZ → FRA May 25, 04:05 UTCMay 25, 05:15 UTC1h 10m
2026-05-24 DTR198 FRA → LNZ May 24, 18:10 UTCMay 24, 19:15 UTC1h 5m
2026-05-24 DTR197 LNZ → FRA May 24, 15:35 UTCMay 24, 16:45 UTC1h 10m
2026-05-23 DTR194 FRA → LNZ May 23, 12:20 UTCMay 23, 13:25 UTC1h 5m
2026-05-23 DTR193 LNZ → FRA May 23, 09:55 UTCMay 23, 11:10 UTC1h 15m
2026-05-22 DTR198 FRA → LNZ May 22, 18:30 UTCMay 22, 19:40 UTC1h 10m
2026-05-22 DTR197 LNZ → FRA May 22, 15:35 UTCMay 22, 16:45 UTC1h 10m
2026-05-22 DTR194 FRA → LNZ May 22, 12:25 UTCMay 22, 13:30 UTC1h 5m
2026-05-22 DTR193 LNZ → FRA May 22, 09:55 UTCMay 22, 11:15 UTC1h 20m
2026-05-21 DTR198 FRA → LNZ May 21, 17:30 UTCMay 21, 18:40 UTC1h 10m
2026-05-21 DTR197 LNZ → FRA May 21, 15:10 UTCMay 21, 16:15 UTC1h 5m
2026-05-21 DTR194 FRA → LNZ May 21, 12:15 UTCMay 21, 13:25 UTC1h 10m
2026-05-21 DTR193 LNZ → FRA May 21, 09:40 UTCMay 21, 10:50 UTC1h 10m
2026-05-20 DTR198 FRA → LNZ May 20, 18:45 UTCMay 20, 19:55 UTC1h 10m
2026-05-20 DTR197 LNZ → FRA May 20, 16:00 UTCMay 20, 17:15 UTC1h 15m
2026-05-20 DTR192 FRA → LNZ May 20, 08:50 UTCMay 20, 10:00 UTC1h 10m
2026-05-20 DTR191 LNZ → FRA May 20, 06:45 UTCMay 20, 07:55 UTC1h 10m
2026-05-19 DTR198 FRA → LNZ May 19, 17:55 UTCMay 19, 19:00 UTC1h 5m
2026-05-19 DTR197 LNZ → FRA May 19, 15:30 UTCMay 19, 16:40 UTC1h 10m
2026-05-19 DTR192 FRA → LNZ May 19, 07:15 UTCMay 19, 08:20 UTC1h 5m
2026-05-19 DTR191 LNZ → FRA May 19, 04:15 UTCMay 19, 05:15 UTC1h 0m
2026-05-18 DTR194 FRA → LNZ May 18, 12:15 UTCMay 18, 13:20 UTC1h 5m
2026-05-18 DTR193 LNZ → FRA May 18, 10:10 UTCMay 18, 11:15 UTC1h 5m
2026-05-18 DTR192 FRA → LNZ May 18, 06:40 UTCMay 18, 07:45 UTC1h 5m
2026-05-18 DTR191 LNZ → FRA May 18, 03:55 UTCMay 18, 05:00 UTC1h 5m
2026-05-17 DTR198 FRA → LNZ May 17, 18:15 UTCMay 17, 19:15 UTC1h 0m
2026-05-17 DTR197 LNZ → FRA May 17, 15:25 UTCMay 17, 16:30 UTC1h 5m
2026-05-16 DTR194 FRA → LNZ May 16, 12:31 UTCMay 16, 13:35 UTC1h 5m
2026-05-16 DTR193 LNZ → FRA May 16, 09:40 UTCMay 16, 10:46 UTC1h 5m
2026-05-15 DTR198 FRA → LNZ May 15, 18:55 UTCMay 15, 19:55 UTC1h 0m
2026-05-15 DTR197 LNZ → FRA May 15, 15:35 UTCMay 15, 16:40 UTC1h 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 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 11h 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 6 distinct callsigns, including DTR198, DTR197, DTR194, DTR193, DTR192.