Apparatus

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sensors Mode-S transponder

4598D3

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-FFS · TECNAM P-2006T

Hex
4598D3
Octal
21314323
Decimal
4,561,107
Country
DK
Tail
OY-FFS
Type
P06T
No current signal · last broadcast 29d ago
Flights observed
21
Distinct callsigns
1
Country
DK
Last broadcast
29d ago

Last known position

Most recent position reported by Mode-S 4598D3.

Country allocation

The ICAO 24-bit address 4598D3 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 1 distinct

Callsign Airline Flights Last seen
EW590AL - 21 2026-07-26

Recent flights last 21

DateFlightRouteTakeoffLandingDuration
2026-07-26 EW590AL - Jul 26, 19:20 UTCJul 26, 21:30 UTC2h 10m
2026-07-26 EW590AL - Jul 26, 18:20 UTCJul 26, 18:45 UTC25m
2026-07-25 EW590AL - Jul 25, 19:45 UTCJul 25, 20:30 UTC45m
2026-07-25 EW590AL - Jul 25, 18:55 UTCJul 25, 19:10 UTC15m
2026-07-24 EW590AL - Jul 24, 18:55 UTCJul 24, 20:40 UTC1h 45m
2026-07-23 EW590AL - Jul 23, 15:50 UTCJul 23, 16:20 UTC30m
2026-07-19 EW590AL - Jul 19, 17:25 UTCJul 19, 18:00 UTC35m
2026-07-19 EW590AL - Jul 19, 16:40 UTCJul 19, 16:50 UTC10m
2026-07-19 EW590AL - Jul 19, 15:10 UTCJul 19, 15:45 UTC35m
2026-07-19 EW590AL - Jul 19, 11:45 UTCJul 19, 13:25 UTC1h 40m
2026-07-16 EW590AL - Jul 16, 06:40 UTCJul 16, 07:30 UTC50m
2026-07-16 EW590AL - Jul 16, 04:50 UTCJul 16, 05:40 UTC50m
2026-07-12 EW590AL - Jul 12, 13:45 UTCJul 12, 15:01 UTC1h 15m
2026-07-12 EW590AL - Jul 12, 12:10 UTCJul 12, 12:45 UTC35m
2026-07-11 EW590AL - Jul 11, 16:30 UTCJul 11, 17:25 UTC55m
2026-07-11 EW590AL - Jul 11, 15:00 UTCJul 11, 15:45 UTC45m
2026-07-11 EW590AL - Jul 11, 12:30 UTCJul 11, 14:20 UTC1h 50m
2026-07-10 EW590AL - Jul 10, 09:25 UTCJul 10, 10:05 UTC40m
2026-07-10 EW590AL - Jul 10, 06:40 UTCJul 10, 07:15 UTC35m
2026-07-09 EW590AL - Jul 9, 06:25 UTCJul 9, 07:05 UTC40m
2026-07-09 EW590AL - Jul 9, 04:25 UTCJul 9, 05:20 UTC55m

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

Mode-S 4598D3 frequently asked

What is Mode-S code 4598D3?
4598D3 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-FFS.
Where is Mode-S 4598D3 registered?
Mode-S code 4598D3 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4598D3 broadcasting right now?
No active broadcast right now. Last signal was 29d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4598D3, octal 21314323, decimal 4,561,107.
What flights does 4598D3 operate?
Mode-S 4598D3 has broadcast 1 distinct callsign, including EW590AL.