Apparatus

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sensors Mode-S transponder

45CAA6

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-RUF · ATR-42-500

Hex
45CAA6
Octal
21345246
Decimal
4,573,862
Country
DK
Tail
OY-RUF
Type
AT45
No current signal · last broadcast 3d ago
Flights observed
293
Distinct callsigns
20
Country
DK
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 45CAA6.

Country allocation

The ICAO 24-bit address 45CAA6 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
DTR76F DAT Danish Air Transport 34 2026-06-03
DTR579 DAT Danish Air Transport 33 2026-06-03
DTR71F DAT Danish Air Transport 31 2026-06-04
DTR578 DAT Danish Air Transport 30 2026-06-03
DTR577 DAT Danish Air Transport 28 2026-06-03
DTR72F DAT Danish Air Transport 27 2026-06-03
DTR74F DAT Danish Air Transport 17 2026-06-03
DTR73F DAT Danish Air Transport 11 2026-06-03
DTR546 - 8 2026-06-19
DTR41S - 8 2026-06-26
DTR44S DAT Danish Air Transport 7 2026-06-19
DTR75F DAT Danish Air Transport 6 2026-05-31
DTR42S DAT Danish Air Transport 6 2026-06-19
DTR45S DAT Danish Air Transport 5 2026-06-19
DTR43S DAT Danish Air Transport 5 2026-06-19
DTR74L - 2 2026-07-07
DTR72C - 2 2026-07-08
DTR71V - 2 2026-07-08
DTR524 DAT Danish Air Transport 2 2026-05-27
DTR523 DAT Danish Air Transport 2 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 DNU961 - Jul 10, 13:55 UTCJul 10, 16:50 UTC2h 55m
2026-07-08 DTR1711 - Jul 8, 09:40 UTCJul 8, 10:30 UTC50m
2026-07-08 DTR1712 - Jul 8, 07:45 UTCJul 8, 08:40 UTC55m
2026-07-08 DTR71V - Jul 8, 05:55 UTCJul 8, 06:40 UTC45m
2026-07-08 DTR72C - Jul 8, 04:20 UTCJul 8, 04:50 UTC30m
2026-07-07 DTR74L - Jul 7, 13:20 UTCJul 7, 14:00 UTC40m
2026-07-07 DTR1711 - Jul 7, 09:45 UTCJul 7, 10:35 UTC50m
2026-07-07 DTR1712 - Jul 7, 07:40 UTCJul 7, 08:35 UTC55m
2026-07-07 DTR71V - Jul 7, 06:00 UTCJul 7, 06:40 UTC40m
2026-07-07 DTR72C - Jul 7, 04:30 UTCJul 7, 05:05 UTC35m
2026-07-06 DTR1713 - Jul 6, 22:25 UTCJul 6, 23:20 UTC55m
2026-07-06 DTR1714 - Jul 6, 20:45 UTCJul 6, 21:40 UTC55m
2026-07-06 DTR73H - Jul 6, 19:10 UTCJul 6, 19:55 UTC45m
2026-07-06 DTR74L - Jul 6, 16:05 UTCJul 6, 16:40 UTC35m
2026-07-06 DNU954 - Jul 6, 12:20 UTCJul 6, 14:55 UTC2h 35m
2026-06-26 DNU948 - Jun 26, 07:24 UTCJun 26, 08:30 UTC1h 5m
2026-06-26 DTR41S - Jun 26, 05:05 UTCJun 26, 05:44 UTC40m
2026-06-19 DTR546 - Jun 19, 16:19 UTCJun 19, 17:14 UTC55m
2026-06-19 DTR45S SRP → OSL Jun 19, 14:49 UTCJun 19, 15:29 UTC40m
2026-06-19 DTR44S OSL → SRP Jun 19, 13:14 UTCJun 19, 14:04 UTC50m
2026-06-19 DTR43S SRP → OSL Jun 19, 11:39 UTCJun 19, 12:19 UTC40m
2026-06-19 DTR42S OSL → SRP Jun 19, 06:35 UTCJun 19, 07:25 UTC50m
2026-06-19 DTR41S SRP → OSL Jun 19, 05:05 UTCJun 19, 05:45 UTC40m
2026-06-18 DTR546 OSL → SRP Jun 18, 16:25 UTCJun 18, 17:10 UTC45m
2026-06-18 DTR45S SRP → OSL Jun 18, 14:50 UTCJun 18, 15:30 UTC40m
2026-06-18 DTR44S OSL → SRP Jun 18, 13:15 UTCJun 18, 14:05 UTC50m
2026-06-18 DTR43S SRP → OSL Jun 18, 11:35 UTCJun 18, 12:20 UTC45m
2026-06-18 DTR42S OSL → SRP Jun 18, 06:40 UTCJun 18, 07:25 UTC45m
2026-06-18 DTR41S SRP → OSL Jun 18, 05:05 UTCJun 18, 05:45 UTC40m
2026-06-12 DTR42S OSL → SRP Jun 12, 06:40 UTCJun 12, 07:25 UTC45m
2026-06-12 DTR41S SRP → OSL Jun 12, 05:05 UTCJun 12, 05:50 UTC45m
2026-06-11 DTR546 OSL → SRP Jun 11, 16:20 UTCJun 11, 17:10 UTC50m
2026-06-11 DTR45S SRP → OSL Jun 11, 14:45 UTCJun 11, 15:30 UTC45m
2026-06-11 DTR44S OSL → SRP Jun 11, 13:10 UTCJun 11, 14:00 UTC50m
2026-06-11 DTR43S SRP → OSL Jun 11, 11:35 UTCJun 11, 12:25 UTC50m
2026-06-11 DTR42S OSL → SRP Jun 11, 07:00 UTCJun 11, 07:45 UTC45m
2026-06-11 DTR41S SRP → OSL Jun 11, 05:20 UTCJun 11, 06:05 UTC45m
2026-06-10 DTR546 OSL → SRP Jun 10, 16:35 UTCJun 10, 17:20 UTC45m
2026-06-10 DTR44S OSL → SRP Jun 10, 14:50 UTCJun 10, 15:35 UTC45m
2026-06-10 DTR44S OSL → SRP Jun 10, 10:00 UTCJun 10, 10:45 UTC45m
2026-06-10 DTR43S SRP → OSL Jun 10, 08:15 UTCJun 10, 09:00 UTC45m
2026-06-10 DTR42S OSL → SRP Jun 10, 06:50 UTCJun 10, 07:35 UTC45m
2026-06-10 DTR41S SRP → OSL Jun 10, 05:05 UTCJun 10, 05:55 UTC50m
2026-06-09 DTR546 OSL → SRP Jun 9, 16:45 UTCJun 9, 17:40 UTC55m
2026-06-09 DTR45S SRP → OSL Jun 9, 14:55 UTCJun 9, 15:50 UTC55m
2026-06-09 DTR44S OSL → SRP Jun 9, 13:20 UTCJun 9, 14:00 UTC40m
2026-06-09 DTR43S SRP → OSL Jun 9, 11:40 UTCJun 9, 12:30 UTC50m
2026-06-09 DTR42S OSL → SRP Jun 9, 06:50 UTCJun 9, 07:35 UTC45m
2026-06-09 DTR41S SRP → OSL Jun 9, 05:10 UTCJun 9, 06:00 UTC50m
2026-06-08 DTR546 OSL → SRP Jun 8, 16:30 UTCJun 8, 17:15 UTC45m

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-RUF page for operator, model, and routing details .

Mode-S 45CAA6 frequently asked

What is Mode-S code 45CAA6?
45CAA6 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-RUF.
Where is Mode-S 45CAA6 registered?
Mode-S code 45CAA6 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45CAA6 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45CAA6, octal 21345246, decimal 4,573,862.
What flights does 45CAA6 operate?
Mode-S 45CAA6 has broadcast 20 distinct callsigns, including DTR76F, DTR579, DTR71F, DTR578, DTR577.