Apparatus

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sensors Mode-S transponder

45CAA2

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-RUB · ATR-72-202

Hex
45CAA2
Octal
21345242
Decimal
4,573,858
Country
DK
Tail
OY-RUB
Type
AT72
No current signal · last broadcast 8h ago
Flights observed
259
Distinct callsigns
20
Country
DK
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 45CAA2.

Country allocation

The ICAO 24-bit address 45CAA2 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
DTR85M DAT Danish Air Transport 29 2026-06-30
DTR83L - 29 2026-06-30
DTR86V - 27 2026-06-30
DTR84H - 26 2026-07-07
DTR81R - 26 2026-07-07
DTR82P - 25 2026-06-30
DTR1842 - 20 2026-07-13
DTR1844 - 19 2026-07-13
DTR1843 - 18 2026-07-13
DTR1841 - 16 2026-07-13
DTR88N - 6 2026-07-07
DTR87C - 5 2026-07-07
DTR1809 - 3 2026-07-11
DTR1845 - 2 2026-07-08
DTR1810 - 2 2026-07-11
DTR84M - 1 2026-05-26
DTR18KA - 1 2026-07-06
DTR1846 - 1 2026-07-08
DNU983 - 1 2026-07-03
DNU975 - 1 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 DTR1843 - Jul 13, 18:00 UTCJul 13, 18:50 UTC50m
2026-07-13 DTR1844 - Jul 13, 16:10 UTCJul 13, 16:55 UTC45m
2026-07-13 DTR1841 - Jul 13, 12:55 UTCJul 13, 13:40 UTC45m
2026-07-13 DTR1842 - Jul 13, 11:15 UTCJul 13, 12:00 UTC45m
2026-07-12 DTR1843 - Jul 12, 17:55 UTCJul 12, 18:40 UTC45m
2026-07-12 DTR1844 - Jul 12, 16:05 UTCJul 12, 16:50 UTC45m
2026-07-11 DTR1843 - Jul 11, 17:45 UTCJul 11, 18:30 UTC45m
2026-07-11 DTR1844 - Jul 11, 15:55 UTCJul 11, 16:40 UTC45m
2026-07-11 DTR1809 - Jul 11, 14:35 UTCJul 11, 15:20 UTC45m
2026-07-11 DTR1810 - Jul 11, 12:55 UTCJul 11, 13:40 UTC45m
2026-07-10 DTR1843 - Jul 10, 18:05 UTCJul 10, 18:50 UTC45m
2026-07-10 DTR1844 - Jul 10, 16:10 UTCJul 10, 16:50 UTC40m
2026-07-08 DTR1843 - Jul 8, 17:55 UTCJul 8, 18:40 UTC45m
2026-07-08 DTR1845 - Jul 8, 16:05 UTCJul 8, 16:55 UTC50m
2026-07-08 DTR1845 - Jul 8, 14:45 UTCJul 8, 15:25 UTC40m
2026-07-08 DTR1846 - Jul 8, 13:00 UTCJul 8, 13:45 UTC45m
2026-07-07 DTR81R PMO → LMP Jul 7, 19:45 UTCJul 7, 20:35 UTC50m
2026-07-07 DTR84H LMP → PMO Jul 7, 18:05 UTCJul 7, 19:00 UTC55m
2026-07-07 DTR87C PMO → LMP Jul 7, 16:45 UTCJul 7, 17:25 UTC40m
2026-07-07 DTR88N LMP → PMO Jul 7, 15:00 UTCJul 7, 15:55 UTC55m
2026-07-07 DTR1809 PMO → LMP Jul 7, 13:30 UTCJul 7, 14:15 UTC45m
2026-07-07 DTR1810 - Jul 7, 11:25 UTCJul 7, 12:15 UTC50m
2026-07-06 DTR1843 - Jul 6, 23:25 UTCJul 7, 00:10 UTC45m
2026-07-06 DTR1844 LMP → PMO Jul 6, 21:15 UTCJul 6, 22:15 UTC1h 0m
2026-07-06 DTR18KA - Jul 6, 19:40 UTCJul 6, 20:25 UTC45m
2026-07-03 DNU983 - Jul 3, 21:15 UTCJul 3, 22:00 UTC45m
2026-07-03 DTR1843 CTA → LMP Jul 3, 19:25 UTCJul 3, 20:10 UTC45m
2026-07-03 DTR1844 LMP → CTA Jul 3, 17:35 UTCJul 3, 18:20 UTC45m
2026-07-03 DTR1809 - Jul 3, 15:40 UTCJul 3, 16:25 UTC45m
2026-07-01 DTR84H - Jul 1, 17:40 UTCJul 1, 18:35 UTC55m
2026-07-01 DTR87C - Jul 1, 15:55 UTCJul 1, 16:45 UTC50m
2026-07-01 DTR88N LMP → PMO Jul 1, 14:10 UTCJul 1, 15:00 UTC50m
2026-06-30 DTR1841 - Jun 30, 13:20 UTCJun 30, 14:10 UTC50m
2026-06-30 DTR1842 - Jun 30, 11:10 UTCJun 30, 12:15 UTC1h 5m
2026-06-30 DTR85M PMO → LMP Jun 30, 09:15 UTCJun 30, 10:05 UTC50m
2026-06-30 DTR86V - Jun 30, 07:20 UTCJun 30, 08:05 UTC45m
2026-06-30 DTR83L - Jun 30, 05:50 UTCJun 30, 06:40 UTC50m
2026-06-30 DTR82P - Jun 30, 04:10 UTCJun 30, 05:00 UTC50m
2026-06-29 DTR85M PMO → LMP Jun 29, 09:40 UTCJun 29, 10:29 UTC50m
2026-06-29 DTR86V - Jun 29, 07:30 UTCJun 29, 08:19 UTC50m
2026-06-29 DTR83L PMO → LMP Jun 29, 06:05 UTCJun 29, 06:54 UTC50m
2026-06-29 DTR82P - Jun 29, 04:09 UTCJun 29, 05:04 UTC55m
2026-06-28 DTR81R - Jun 28, 18:55 UTCJun 28, 19:49 UTC55m
2026-06-28 DTR84H - Jun 28, 17:10 UTCJun 28, 17:55 UTC45m
2026-06-28 DTR1841 - Jun 28, 13:04 UTCJun 28, 13:49 UTC45m
2026-06-28 DTR1842 - Jun 28, 11:00 UTCJun 28, 11:45 UTC45m
2026-06-28 DTR85M PMO → LMP Jun 28, 09:20 UTCJun 28, 10:10 UTC50m
2026-06-28 DTR86V - Jun 28, 07:25 UTCJun 28, 08:14 UTC50m
2026-06-28 DTR83L PMO → LMP Jun 28, 05:55 UTCJun 28, 06:55 UTC1h 0m
2026-06-28 DTR82P - Jun 28, 04:10 UTCJun 28, 05:09 UTC1h 0m

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

Mode-S 45CAA2 frequently asked

What is Mode-S code 45CAA2?
45CAA2 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-RUB.
Where is Mode-S 45CAA2 registered?
Mode-S code 45CAA2 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45CAA2 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45CAA2, octal 21345242, decimal 4,573,858.
What flights does 45CAA2 operate?
Mode-S 45CAA2 has broadcast 20 distinct callsigns, including DTR85M, DTR83L, DTR86V, DTR84H, DTR81R.