Apparatus

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sensors Mode-S transponder

45A1F4

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-HOT · AGUSTA AW-169

Hex
45A1F4
Octal
21320764
Decimal
4,563,444
Country
DK
Tail
OY-HOT
Type
A169
No current signal · last broadcast 16d ago
Flights observed
130
Distinct callsigns
2
Country
DK
Last broadcast
16d ago

Last known position

Most recent position reported by Mode-S 45A1F4.

Country allocation

The ICAO 24-bit address 45A1F4 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 2 distinct

Callsign Airline Flights Last seen
UFX64 - 122 2026-06-24
UNC64 - 8 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-27 UNC64 - Jun 27, 20:44 UTCJun 27, 21:55 UTC1h 10m
2026-06-27 UNC64 - Jun 27, 19:24 UTCJun 27, 20:09 UTC45m
2026-06-26 UNC64 - Jun 26, 07:20 UTCJun 26, 08:05 UTC45m
2026-06-26 UNC64 - Jun 26, 06:09 UTCJun 26, 06:45 UTC35m
2026-06-26 UNC64 - Jun 26, 02:54 UTCJun 26, 04:00 UTC1h 5m
2026-06-25 UNC64 - Jun 25, 14:59 UTCJun 25, 15:29 UTC30m
2026-06-25 UNC64 - Jun 25, 12:15 UTCJun 25, 14:09 UTC1h 55m
2026-06-25 UNC64 HUY → GRQ Jun 25, 09:20 UTCJun 25, 11:25 UTC2h 5m
2026-06-24 UFX64 - Jun 24, 14:20 UTCJun 24, 15:39 UTC1h 20m
2026-06-24 UFX64 HUY → HUY Jun 24, 07:20 UTCJun 24, 08:45 UTC1h 25m
2026-06-21 UFX64 - Jun 21, 15:05 UTCJun 21, 15:49 UTC45m
2026-06-21 UFX64 - Jun 21, 13:39 UTCJun 21, 14:30 UTC50m
2026-06-21 UFX64 HUY → HUY Jun 21, 09:20 UTCJun 21, 09:29 UTC10m
2026-06-20 UFX64 - Jun 20, 16:44 UTCJun 20, 17:24 UTC40m
2026-06-20 UFX64 - Jun 20, 09:19 UTCJun 20, 09:44 UTC25m
2026-06-18 UFX64 BLK → HUY Jun 18, 12:55 UTCJun 18, 13:45 UTC50m
2026-06-18 UFX64 - Jun 18, 12:15 UTCJun 18, 12:35 UTC20m
2026-06-18 UFX64 - Jun 18, 11:55 UTCJun 18, 12:10 UTC15m
2026-06-18 UFX64 - Jun 18, 07:45 UTCJun 18, 07:55 UTC10m
2026-06-18 UFX64 - Jun 18, 07:25 UTCJun 18, 07:40 UTC15m
2026-06-18 UFX64 LPL → BLK Jun 18, 06:25 UTCJun 18, 06:40 UTC15m
2026-06-17 UFX64 BLK → LPL Jun 17, 14:50 UTCJun 17, 15:10 UTC20m
2026-06-17 UFX64 - Jun 17, 13:10 UTCJun 17, 13:45 UTC35m
2026-06-17 UFX64 - Jun 17, 12:50 UTCJun 17, 13:05 UTC15m
2026-06-17 UFX64 BLK → BLK Jun 17, 11:50 UTCJun 17, 12:20 UTC30m
2026-06-17 UFX64 - Jun 17, 10:05 UTCJun 17, 10:35 UTC30m
2026-06-17 UFX64 BLK → BLK Jun 17, 09:10 UTCJun 17, 09:45 UTC35m
2026-06-17 UFX64 - Jun 17, 07:10 UTCJun 17, 08:05 UTC55m
2026-06-15 UFX64 BLK → HUY Jun 15, 12:49 UTCJun 15, 13:40 UTC50m
2026-06-15 UFX64 - Jun 15, 10:40 UTCJun 15, 11:19 UTC40m
2026-06-15 UFX64 BLK → BLK Jun 15, 09:49 UTCJun 15, 10:24 UTC35m
2026-06-15 UFX64 - Jun 15, 09:00 UTCJun 15, 09:35 UTC35m
2026-06-15 UFX64 HUY → BLK Jun 15, 07:00 UTCJun 15, 07:55 UTC55m
2026-06-12 UFX64 BLK → HUY Jun 12, 15:25 UTCJun 12, 16:10 UTC45m
2026-06-12 UFX64 - Jun 12, 14:10 UTCJun 12, 14:45 UTC35m
2026-06-12 UFX64 BLK → BLK Jun 12, 12:45 UTCJun 12, 13:45 UTC1h 0m
2026-06-12 UFX64 - Jun 12, 10:50 UTCJun 12, 11:50 UTC1h 0m
2026-06-09 UFX64 BLK → BLK Jun 9, 14:25 UTCJun 9, 15:35 UTC1h 10m
2026-06-09 UFX64 - Jun 9, 13:45 UTCJun 9, 14:00 UTC15m
2026-06-09 UFX64 - Jun 9, 13:25 UTCJun 9, 13:40 UTC15m
2026-06-09 UFX64 - Jun 9, 12:40 UTCJun 9, 12:55 UTC15m
2026-06-09 UFX64 - Jun 9, 12:00 UTCJun 9, 12:35 UTC35m
2026-06-09 UFX64 - Jun 9, 10:10 UTCJun 9, 11:05 UTC55m
2026-06-08 UFX64 - Jun 8, 15:00 UTCJun 8, 15:35 UTC35m
2026-06-08 UFX64 - Jun 8, 14:00 UTCJun 8, 14:25 UTC25m
2026-06-05 UFX64 - Jun 5, 11:45 UTCJun 5, 13:30 UTC1h 45m
2026-06-04 UFX64 - Jun 4, 12:55 UTCJun 4, 15:05 UTC2h 10m
2026-06-03 UFX64 - Jun 3, 13:30 UTCJun 3, 14:10 UTC40m
2026-06-03 UFX64 - Jun 3, 10:30 UTCJun 3, 11:00 UTC30m
2026-06-01 UFX64 - Jun 1, 13:50 UTCJun 1, 14:20 UTC30m

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

Mode-S 45A1F4 frequently asked

What is Mode-S code 45A1F4?
45A1F4 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-HOT.
Where is Mode-S 45A1F4 registered?
Mode-S code 45A1F4 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45A1F4 broadcasting right now?
No active broadcast right now. Last signal was 16d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45A1F4, octal 21320764, decimal 4,563,444.
What flights does 45A1F4 operate?
Mode-S 45A1F4 has broadcast 2 distinct callsigns, including UFX64, UNC64.