Apparatus

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sensors Mode-S transponder

459A65

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-FSE · SAAB 2000

Hex
459A65
Octal
21315145
Decimal
4,561,509
Country
DK
Tail
OY-FSE
Type
SB20
No current signal · last broadcast Jul 26, 14:35 UTC
Flights observed
229
Distinct callsigns
20
Country
DK
Last broadcast
Jul 26, 14:35 UTC

Last known position

Most recent position reported by Mode-S 459A65.

Country allocation

The ICAO 24-bit address 459A65 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
FRO678 - 22 2026-07-23
FRO679 - 19 2026-07-23
FRO674 - 19 2026-07-24
FRO675 - 18 2026-07-24
FRO685 - 17 2026-05-27
FRO684 - 16 2026-05-27
FRO671 - 13 2026-05-28
FRO670 - 13 2026-05-28
FRO800 - 6 2026-07-12
FRO801 - 5 2026-07-12
FRO932 - 3 2026-05-02
FRO1932 - 3 2026-05-02
FRO944 - 2 2026-06-05
FRO941 - 2 2026-05-31
FRO935 - 2 2026-05-07
FRO921 - 2 2026-07-26
FRO920 - 2 2026-07-24
FRO903 - 2 2026-07-26
FRO901 - 2 2026-07-12
FRO900 - 2 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FRO903 DUS → BRU Jul 26, 14:00 UTCJul 26, 14:30 UTC30m
2026-07-26 FRO003 INN → DUS Jul 26, 12:10 UTCJul 26, 13:20 UTC1h 10m
2026-07-26 FRO921 BSL → INN Jul 26, 10:30 UTCJul 26, 11:20 UTC50m
2026-07-25 FRO021 - Jul 25, 19:45 UTCJul 25, 21:15 UTC1h 30m
2026-07-25 FRO020 - Jul 25, 06:20 UTCJul 25, 07:50 UTC1h 30m
2026-07-24 FRO920 - Jul 24, 13:30 UTCJul 24, 15:15 UTC1h 45m
2026-07-24 FRO675 - Jul 24, 09:30 UTCJul 24, 10:20 UTC50m
2026-07-24 FRO674 - Jul 24, 07:40 UTCJul 24, 08:40 UTC1h 0m
2026-07-23 FRO679 - Jul 23, 14:10 UTCJul 23, 15:00 UTC50m
2026-07-23 FRO678 MMX → BMA Jul 23, 12:35 UTCJul 23, 13:40 UTC1h 5m
2026-07-23 FRO675 - Jul 23, 09:20 UTCJul 23, 10:15 UTC55m
2026-07-23 FRO674 - Jul 23, 07:45 UTCJul 23, 08:40 UTC55m
2026-07-22 FRO679 - Jul 22, 13:55 UTCJul 22, 14:50 UTC55m
2026-07-22 FRO678 - Jul 22, 12:25 UTCJul 22, 13:25 UTC1h 0m
2026-07-22 FRO675 - Jul 22, 11:10 UTCJul 22, 11:35 UTC25m
2026-07-21 FRO679 - Jul 21, 14:15 UTCJul 21, 15:05 UTC50m
2026-07-21 FRO678 - Jul 21, 12:40 UTCJul 21, 13:40 UTC1h 0m
2026-07-21 FRO675 BMA → MMX Jul 21, 09:20 UTCJul 21, 10:20 UTC1h 0m
2026-07-21 FRO674 - Jul 21, 07:45 UTCJul 21, 08:45 UTC1h 0m
2026-07-20 FRO679 - Jul 20, 14:10 UTCJul 20, 15:05 UTC55m
2026-07-20 FRO678 - Jul 20, 12:35 UTCJul 20, 13:35 UTC1h 0m
2026-07-20 FRO675 - Jul 20, 09:50 UTCJul 20, 10:50 UTC1h 0m
2026-07-20 FRO674 - Jul 20, 07:50 UTCJul 20, 08:50 UTC1h 0m
2026-07-12 FRO901 - Jul 12, 12:25 UTCJul 12, 13:55 UTC1h 30m
2026-07-12 FRO801 - Jul 12, 10:01 UTCJul 12, 11:45 UTC1h 45m
2026-07-12 FRO800 - Jul 12, 06:55 UTCJul 12, 08:35 UTC1h 40m
2026-07-10 FRO921 - Jul 10, 12:40 UTCJul 10, 13:40 UTC1h 0m
2026-07-10 FRO020 - Jul 10, 10:50 UTCJul 10, 11:45 UTC55m
2026-07-08 FRO019 - Jul 8, 09:15 UTCJul 8, 10:15 UTC1h 0m
2026-07-08 FRO919 - Jul 8, 06:15 UTCJul 8, 08:20 UTC2h 5m
2026-07-05 FRO800 - Jul 5, 06:55 UTCJul 5, 08:20 UTC1h 25m
2026-07-05 FRO900 - Jul 5, 03:45 UTCJul 5, 05:20 UTC1h 35m
2026-06-27 FRO916 TLL → MMX Jun 27, 18:04 UTCJun 27, 19:29 UTC1h 25m
2026-06-27 FRO316 - Jun 27, 15:24 UTCJun 27, 17:04 UTC1h 40m
2026-06-25 FRO315 - Jun 25, 07:09 UTCJun 25, 09:14 UTC2h 5m
2026-06-25 FRO915 - Jun 25, 04:25 UTCJun 25, 05:50 UTC1h 25m
2026-06-21 FRO963 - Jun 21, 09:15 UTCJun 21, 10:14 UTC1h 0m
2026-06-20 FRO263 - Jun 20, 17:39 UTCJun 20, 18:24 UTC45m
2026-06-20 FRO262 - Jun 20, 09:19 UTCJun 20, 12:09 UTC2h 50m
2026-06-20 FRO962 - Jun 20, 06:39 UTCJun 20, 08:05 UTC1h 25m
2026-06-18 FRO051 MUC → BWE Jun 18, 19:00 UTCJun 18, 19:55 UTC55m
2026-06-18 FRO114 - Jun 18, 11:45 UTCJun 18, 14:20 UTC2h 35m
2026-06-17 FRO114 - Jun 17, 13:20 UTCJun 18, 13:15 UTC23h 55m
2026-06-17 FRO110 - Jun 17, 11:35 UTCJun 17, 13:35 UTC2h 0m
2026-06-17 FRO110 - Jun 17, 09:20 UTCJun 17, 10:30 UTC1h 10m
2026-06-16 FRO347 - Jun 16, 16:55 UTCJun 16, 17:35 UTC40m
2026-06-16 FRO346 BRU → PAD Jun 16, 08:39 UTCJun 16, 09:25 UTC45m
2026-06-14 FRO910 INN → BRU Jun 14, 12:45 UTCJun 14, 14:00 UTC1h 15m
2026-06-14 FRO801 - Jun 14, 10:10 UTCJun 14, 11:50 UTC1h 40m
2026-06-14 FRO800 - Jun 14, 07:00 UTCJun 14, 08:35 UTC1h 35m

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

Mode-S 459A65 frequently asked

What is Mode-S code 459A65?
459A65 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-FSE.
Where is Mode-S 459A65 registered?
Mode-S code 459A65 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 459A65 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 459A65, octal 21315145, decimal 4,561,509.
What flights does 459A65 operate?
Mode-S 459A65 has broadcast 20 distinct callsigns, including FRO678, FRO679, FRO674, FRO675, FRO685.