Apparatus

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sensors Mode-S transponder

45AA4F

ICAO 24-bit transponder address · allocated to Denmark

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

Hex
45AA4F
Octal
21325117
Decimal
4,565,583
Country
DK
Tail
OY-JRO
Type
AT45
No current signal · last broadcast 6h ago
Flights observed
252
Distinct callsigns
9
Country
DK
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 45AA4F.

Country allocation

The ICAO 24-bit address 45AA4F 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 9 distinct

Callsign Airline Flights Last seen
DTR73H DAT Danish Air Transport 34 2026-05-29
DTR74L DAT Danish Air Transport 33 2026-05-29
DTR1712 DAT Danish Air Transport 33 2026-05-29
DTR1711 DAT Danish Air Transport 33 2026-05-29
DTR71V DAT Danish Air Transport 32 2026-05-29
DTR72C DAT Danish Air Transport 31 2026-05-29
DTR1714 DAT Danish Air Transport 28 2026-05-29
DTR1713 DAT Danish Air Transport 27 2026-05-29
DNU938 - 1 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 DTR1713 LIN → AOI May 29, 18:20 UTCMay 29, 19:20 UTC1h 0m
2026-05-29 DTR1714 AOI → LIN May 29, 16:30 UTCMay 29, 17:30 UTC1h 0m
2026-05-29 DTR73H FCO → AOI May 29, 15:00 UTCMay 29, 15:40 UTC40m
2026-05-29 DTR74L AOI → FCO May 29, 13:20 UTCMay 29, 13:55 UTC35m
2026-05-29 DTR1711 LIN → AOI May 29, 09:40 UTCMay 29, 10:35 UTC55m
2026-05-29 DTR1712 AOI → LIN May 29, 07:40 UTCMay 29, 08:40 UTC1h 0m
2026-05-29 DTR71V FCO → AOI May 29, 05:55 UTCMay 29, 06:35 UTC40m
2026-05-29 DTR72C AOI → FCO May 29, 04:15 UTCMay 29, 04:50 UTC35m
2026-05-28 DTR1713 LIN → AOI May 28, 20:30 UTCMay 28, 21:30 UTC1h 0m
2026-05-28 DTR1714 AOI → LIN May 28, 16:30 UTCMay 28, 17:25 UTC55m
2026-05-28 DTR73H FCO → AOI May 28, 14:55 UTCMay 28, 15:40 UTC45m
2026-05-28 DTR74L AOI → FCO May 28, 13:15 UTCMay 28, 13:45 UTC30m
2026-05-28 DTR1711 LIN → AOI May 28, 09:30 UTCMay 28, 10:20 UTC50m
2026-05-28 DTR1712 AOI → LIN May 28, 07:30 UTCMay 28, 08:30 UTC1h 0m
2026-05-28 DTR71V FCO → AOI May 28, 06:00 UTCMay 28, 06:50 UTC50m
2026-05-28 DTR72C AOI → FCO May 28, 04:15 UTCMay 28, 04:55 UTC40m
2026-05-27 DTR1713 LIN → AOI May 27, 18:25 UTCMay 27, 19:25 UTC1h 0m
2026-05-27 DTR1714 AOI → LIN May 27, 16:30 UTCMay 27, 17:30 UTC1h 0m
2026-05-27 DTR73H FCO → AOI May 27, 14:50 UTCMay 27, 15:35 UTC45m
2026-05-27 DTR74L AOI → FCO May 27, 13:10 UTCMay 27, 13:45 UTC35m
2026-05-27 DTR1711 LIN → AOI May 27, 09:45 UTCMay 27, 10:35 UTC50m
2026-05-27 DTR1712 AOI → LIN May 27, 07:30 UTCMay 27, 08:25 UTC55m
2026-05-27 DTR71V FCO → AOI May 27, 05:49 UTCMay 27, 06:25 UTC35m
2026-05-27 DTR72C AOI → FCO May 27, 04:14 UTCMay 27, 04:45 UTC30m
2026-05-26 DTR73H FCO → AOI May 26, 15:09 UTCMay 26, 15:45 UTC35m
2026-05-26 DTR74L AOI → FCO May 26, 13:15 UTCMay 26, 13:50 UTC35m
2026-05-26 DTR1711 LIN → AOI May 26, 09:25 UTCMay 26, 10:20 UTC55m
2026-05-26 DTR1712 AOI → LIN May 26, 07:29 UTCMay 26, 08:19 UTC50m
2026-05-26 DTR71V FCO → AOI May 26, 05:49 UTCMay 26, 06:25 UTC35m
2026-05-26 DTR72C AOI → FCO May 26, 04:10 UTCMay 26, 04:45 UTC35m
2026-05-25 DTR1713 LIN → AOI May 25, 18:20 UTCMay 25, 19:20 UTC1h 0m
2026-05-25 DTR1714 AOI → LIN May 25, 16:30 UTCMay 25, 17:25 UTC55m
2026-05-25 DTR73H FCO → AOI May 25, 15:05 UTCMay 25, 15:50 UTC45m
2026-05-25 DTR74L AOI → FCO May 25, 13:05 UTCMay 25, 13:35 UTC30m
2026-05-25 DTR1711 LIN → AOI May 25, 09:15 UTCMay 25, 10:10 UTC55m
2026-05-25 DTR1712 AOI → LIN May 25, 07:30 UTCMay 25, 08:25 UTC55m
2026-05-25 DTR71V FCO → AOI May 25, 05:40 UTCMay 25, 06:25 UTC45m
2026-05-25 DTR72C AOI → FCO May 25, 04:10 UTCMay 25, 04:50 UTC40m
2026-05-22 DTR1713 LIN → AOI May 22, 18:10 UTCMay 22, 19:05 UTC55m
2026-05-22 DTR1714 AOI → LIN May 22, 16:30 UTCMay 22, 17:20 UTC50m
2026-05-22 DTR73H FCO → AOI May 22, 14:55 UTCMay 22, 15:40 UTC45m
2026-05-22 DTR74L AOI → FCO May 22, 13:05 UTCMay 22, 13:40 UTC35m
2026-05-22 DTR1711 LIN → AOI May 22, 09:20 UTCMay 22, 10:10 UTC50m
2026-05-22 DTR1712 AOI → LIN May 22, 07:30 UTCMay 22, 08:25 UTC55m
2026-05-22 DTR71V FCO → AOI May 22, 05:50 UTCMay 22, 06:25 UTC35m
2026-05-22 DTR72C AOI → FCO May 22, 04:15 UTCMay 22, 04:50 UTC35m
2026-05-21 DTR1713 LIN → AOI May 21, 18:25 UTCMay 21, 19:15 UTC50m
2026-05-21 DTR1714 AOI → LIN May 21, 16:25 UTCMay 21, 17:20 UTC55m
2026-05-21 DTR73H FCO → AOI May 21, 14:55 UTCMay 21, 15:35 UTC40m
2026-05-21 DTR74L AOI → FCO May 21, 13:05 UTCMay 21, 13:40 UTC35m

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

Mode-S 45AA4F frequently asked

What is Mode-S code 45AA4F?
45AA4F is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-JRO.
Where is Mode-S 45AA4F registered?
Mode-S code 45AA4F is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45AA4F broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45AA4F, octal 21325117, decimal 4,565,583.
What flights does 45AA4F operate?
Mode-S 45AA4F has broadcast 9 distinct callsigns, including DTR73H, DTR74L, DTR1712, DTR1711, DTR71V.