Apparatus

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sensors Mode-S transponder

45D1F4

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-TOT · PIPER PA-28-140/150/160/180

Hex
45D1F4
Octal
21350764
Decimal
4,575,732
Country
DK
Tail
OY-TOT
Type
P28A
No current signal · last broadcast 9h ago
Flights observed
237
Distinct callsigns
2
Country
DK
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S 45D1F4.

Country allocation

The ICAO 24-bit address 45D1F4 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
FHUBC - 231 2026-07-13
FHUBC1 - 6 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 FHUBC - Jul 13, 16:50 UTCJul 13, 18:10 UTC1h 20m
2026-07-13 FHUBC AVN → AVN Jul 13, 15:05 UTCJul 13, 16:15 UTC1h 10m
2026-07-10 FHUBC - Jul 10, 07:50 UTCJul 10, 08:30 UTC40m
2026-07-10 FHUBC AVN → AVN Jul 10, 06:20 UTCJul 10, 07:05 UTC45m
2026-07-09 FHUBC AVN → AVN Jul 9, 18:30 UTCJul 9, 19:45 UTC1h 15m
2026-07-09 FHUBC - Jul 9, 15:45 UTCJul 9, 16:10 UTC25m
2026-07-09 FHUBC - Jul 9, 06:55 UTCJul 9, 09:00 UTC2h 5m
2026-07-08 FHUBC - Jul 8, 15:40 UTCJul 8, 17:00 UTC1h 20m
2026-07-08 FHUBC - Jul 8, 09:25 UTCJul 8, 11:25 UTC2h 0m
2026-07-08 FHUBC AVN → AVN Jul 8, 07:50 UTCJul 8, 08:20 UTC30m
2026-07-08 FHUBC - Jul 8, 06:00 UTCJul 8, 07:10 UTC1h 10m
2026-07-07 FHUBC - Jul 7, 17:15 UTCJul 7, 18:40 UTC1h 25m
2026-07-07 FHUBC AVN → AVN Jul 7, 15:00 UTCJul 7, 16:25 UTC1h 25m
2026-07-07 FHUBC AVN → AVN Jul 7, 08:05 UTCJul 7, 09:05 UTC1h 0m
2026-07-07 FHUBC - Jul 7, 06:35 UTCJul 7, 07:10 UTC35m
2026-07-06 FHUBC AVN → AVN Jul 6, 15:30 UTCJul 6, 16:45 UTC1h 15m
2026-07-06 FHUBC - Jul 6, 12:55 UTCJul 6, 14:55 UTC2h 0m
2026-07-05 FHUBC - Jul 5, 15:40 UTCJul 5, 16:15 UTC35m
2026-07-03 FHUBC - Jul 3, 15:20 UTCJul 3, 16:25 UTC1h 5m
2026-07-03 FHUBC - Jul 3, 12:35 UTCJul 3, 14:05 UTC1h 30m
2026-07-03 FHUBC AVN → AVN Jul 3, 08:50 UTCJul 3, 09:55 UTC1h 5m
2026-07-03 FHUBC AVN → AVN Jul 3, 05:45 UTCJul 3, 07:10 UTC1h 25m
2026-07-02 FHUBC - Jul 2, 15:40 UTCJul 2, 17:05 UTC1h 25m
2026-07-02 FHUBC - Jul 2, 12:45 UTCJul 2, 14:05 UTC1h 20m
2026-07-02 FHUBC - Jul 2, 08:45 UTCJul 2, 10:25 UTC1h 40m
2026-07-01 FHUBC - Jul 1, 17:30 UTCJul 1, 19:55 UTC2h 25m
2026-07-01 FHUBC - Jul 1, 16:20 UTCJul 1, 17:05 UTC45m
2026-07-01 FHUBC - Jul 1, 13:55 UTCJul 1, 15:45 UTC1h 50m
2026-07-01 FHUBC - Jul 1, 11:50 UTCJul 1, 13:25 UTC1h 35m
2026-07-01 FHUBC - Jul 1, 09:45 UTCJul 1, 11:15 UTC1h 30m
2026-07-01 FHUBC - Jul 1, 08:15 UTCJul 1, 08:50 UTC35m
2026-07-01 FHUBC AVN → AVN Jul 1, 05:25 UTCJul 1, 07:10 UTC1h 45m
2026-06-30 FHUBC AVN → AVN Jun 30, 15:20 UTCJun 30, 16:30 UTC1h 10m
2026-06-30 FHUBC - Jun 30, 12:45 UTCJun 30, 13:50 UTC1h 5m
2026-06-30 FHUBC - Jun 30, 08:35 UTCJun 30, 10:30 UTC1h 55m
2026-06-30 FHUBC - Jun 30, 07:05 UTCJun 30, 07:30 UTC25m
2026-06-29 FHUBC AVN → AVN Jun 29, 15:45 UTCJun 29, 16:04 UTC20m
2026-06-29 FHUBC - Jun 29, 14:25 UTCJun 29, 15:04 UTC40m
2026-06-29 FHUBC AVN → AVN Jun 29, 06:19 UTCJun 29, 06:59 UTC40m
2026-06-26 FHUBC - Jun 26, 20:24 UTCJun 26, 21:50 UTC1h 25m
2026-06-26 FHUBC - Jun 26, 16:39 UTCJun 26, 18:49 UTC2h 10m
2026-06-26 FHUBC - Jun 26, 15:15 UTCJun 26, 15:54 UTC40m
2026-06-26 FHUBC - Jun 26, 10:39 UTCJun 26, 11:24 UTC45m
2026-06-23 FHUBC - Jun 23, 05:15 UTCJun 23, 07:45 UTC2h 30m
2026-06-22 FHUBC - Jun 22, 09:45 UTCJun 22, 10:55 UTC1h 10m
2026-06-22 FHUBC AVN → AVN Jun 22, 08:10 UTCJun 22, 09:04 UTC55m
2026-06-19 FHUBC AVN → AVN Jun 19, 14:34 UTCJun 19, 15:49 UTC1h 15m
2026-06-19 FHUBC - Jun 19, 12:59 UTCJun 19, 13:50 UTC50m
2026-06-19 FHUBC - Jun 19, 10:50 UTCJun 19, 11:34 UTC45m
2026-06-19 FHUBC - Jun 19, 08:04 UTCJun 19, 09:30 UTC1h 25m

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

Mode-S 45D1F4 frequently asked

What is Mode-S code 45D1F4?
45D1F4 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-TOT.
Where is Mode-S 45D1F4 registered?
Mode-S code 45D1F4 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45D1F4 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45D1F4, octal 21350764, decimal 4,575,732.
What flights does 45D1F4 operate?
Mode-S 45D1F4 has broadcast 2 distinct callsigns, including FHUBC, FHUBC1.