Apparatus

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sensors Mode-S transponder

459A63

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-FSC · SAAB 2000

Hex
459A63
Octal
21315143
Decimal
4,561,507
Country
DK
Tail
OY-FSC
Type
SB20
No current signal · last broadcast 15h ago
Flights observed
204
Distinct callsigns
20
Country
DK
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 459A63.

Country allocation

The ICAO 24-bit address 459A63 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
FRO679 - 18 2026-05-24
FRO678 - 18 2026-05-24
FRO685 - 17 2026-05-25
FRO684 - 17 2026-05-25
FRO675 - 16 2026-05-25
FRO674 - 16 2026-05-25
FRO671 - 13 2026-05-25
FRO670 - 13 2026-05-25
FRO942 - 4 2026-06-12
FRO945 - 2 2026-07-12
FRO934 - 2 2026-07-06
FRO930 - 2 2026-06-25
FRO913 - 2 2026-07-15
FRO912 - 2 2026-07-13
FRO244 - 2 2026-04-15
FRO243 - 2 2026-04-15
FRO112 - 2 2026-06-19
FRO111 - 2 2026-06-18
FRO013 - 2 2026-07-14
FRO012 - 2 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 FRO939 - Jul 17, 16:24 UTCJul 17, 17:40 UTC1h 15m
2026-07-17 FRO239 - Jul 17, 12:30 UTCJul 17, 15:40 UTC3h 10m
2026-07-16 FRO238 - Jul 16, 12:09 UTCJul 16, 14:40 UTC2h 30m
2026-07-16 FRO938 - Jul 16, 09:00 UTCJul 16, 10:15 UTC1h 15m
2026-07-15 FRO913 - Jul 15, 00:05 UTCJul 15, 02:05 UTC2h 0m
2026-07-14 FRO013 - Jul 14, 22:10 UTCJul 14, 23:15 UTC1h 4m
2026-07-13 FRO012 - Jul 13, 07:50 UTCJul 13, 08:45 UTC55m
2026-07-13 FRO912 - Jul 13, 03:55 UTCJul 13, 05:50 UTC1h 55m
2026-07-12 FRO945 - Jul 12, 09:15 UTCJul 12, 10:45 UTC1h 30m
2026-07-11 FRO045 - Jul 11, 21:25 UTCJul 11, 22:45 UTC1h 20m
2026-07-11 FRO044 - Jul 11, 08:01 UTCJul 11, 09:20 UTC1h 20m
2026-07-10 FRO902 - Jul 10, 17:35 UTCJul 10, 18:55 UTC1h 20m
2026-07-10 FRO002 MUC → BWE Jul 10, 16:00 UTCJul 10, 16:55 UTC55m
2026-07-09 FRO001 - Jul 9, 14:10 UTCJul 9, 15:05 UTC55m
2026-07-08 FRO901 - Jul 8, 12:05 UTCJul 8, 14:00 UTC1h 55m
2026-07-08 FRO035 - Jul 8, 07:55 UTCJul 8, 11:05 UTC3h 10m
2026-07-06 FRO034 - Jul 6, 08:30 UTCJul 6, 11:20 UTC2h 50m
2026-07-06 FRO934 - Jul 6, 05:00 UTCJul 6, 07:20 UTC2h 20m
2026-06-26 FRO945 - Jun 26, 11:45 UTCJun 26, 13:19 UTC1h 35m
2026-06-26 FRO444 - Jun 26, 09:20 UTCJun 26, 11:00 UTC1h 40m
2026-06-25 FRO930 FKB → CPH Jun 25, 19:05 UTCJun 25, 20:30 UTC1h 25m
2026-06-25 FRO335 - Jun 25, 16:05 UTCJun 25, 18:24 UTC2h 20m
2026-06-25 FRO452 - Jun 25, 00:19 UTCJun 25, 01:24 UTC1h 5m
2026-06-23 FRO952 OSL → CPH Jun 23, 11:54 UTCJun 23, 12:55 UTC1h 0m
2026-06-23 FRO334 - Jun 23, 08:45 UTCJun 23, 09:54 UTC1h 10m
2026-06-23 FRO935 - Jun 23, 06:24 UTCJun 23, 06:34 UTC10m
2026-06-20 FRO934 - Jun 20, 11:20 UTCJun 20, 11:34 UTC15m
2026-06-20 FRO333 - Jun 20, 09:05 UTCJun 20, 10:34 UTC1h 30m
2026-06-20 FRO933 BRU → FKB Jun 20, 07:19 UTCJun 20, 07:59 UTC40m
2026-06-19 FRO112 - Jun 19, 08:20 UTCJun 19, 10:35 UTC2h 15m
2026-06-18 FRO112 - Jun 18, 10:55 UTCJun 19, 10:35 UTC23h 39m
2026-06-18 FRO111 - Jun 18, 09:35 UTCJun 19, 08:44 UTC23h 9m
2026-06-18 FRO111 - Jun 18, 07:40 UTCJun 18, 08:50 UTC1h 10m
2026-06-18 FRO911 MUC → BRU Jun 18, 05:20 UTCJun 18, 06:30 UTC1h 10m
2026-06-17 FRO050 - Jun 17, 12:25 UTCJun 17, 13:20 UTC55m
2026-06-17 FRO950 - Jun 17, 10:00 UTCJun 17, 10:45 UTC45m
2026-06-15 FRO943 - Jun 15, 10:45 UTCJun 15, 12:35 UTC1h 50m
2026-06-15 FRO343 - Jun 15, 08:35 UTCJun 15, 10:00 UTC1h 25m
2026-06-15 FRO974 - Jun 15, 05:50 UTCJun 15, 07:10 UTC1h 20m
2026-06-13 FRO013 - Jun 13, 19:30 UTCJun 13, 20:10 UTC40m
2026-06-13 FRO012 - Jun 13, 07:55 UTCJun 13, 08:40 UTC45m
2026-06-12 FRO912 - Jun 12, 10:30 UTCJun 12, 12:00 UTC1h 30m
2026-06-12 FRO342 - Jun 12, 08:20 UTCJun 12, 09:30 UTC1h 10m
2026-06-12 FRO942 - Jun 12, 04:25 UTCJun 12, 06:30 UTC2h 5m
2026-06-11 FRO932 - Jun 11, 12:10 UTCJun 11, 14:15 UTC2h 5m
2026-06-10 FRO331 - Jun 10, 13:25 UTCJun 10, 13:50 UTC25m
2026-06-10 FRO330 - Jun 10, 07:20 UTCJun 10, 07:45 UTC25m
2026-06-10 FRO930 - Jun 10, 04:40 UTCJun 10, 05:25 UTC45m
2026-06-01 FRO942 - Jun 1, 13:15 UTCJun 1, 13:55 UTC40m
2026-05-31 FRO441 - May 31, 20:15 UTCMay 31, 22:30 UTC2h 15m

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

Mode-S 459A63 frequently asked

What is Mode-S code 459A63?
459A63 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-FSC.
Where is Mode-S 459A63 registered?
Mode-S code 459A63 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 459A63 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 459A63, octal 21315143, decimal 4,561,507.
What flights does 459A63 operate?
Mode-S 459A63 has broadcast 20 distinct callsigns, including FRO679, FRO678, FRO685, FRO684, FRO675.