Apparatus

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sensors Mode-S transponder

4598CA

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-FFJ

Hex
4598CA
Octal
21314312
Decimal
4,561,098
Country
DK
Tail
OY-FFJ
Type
SIRA
No current signal · last broadcast 4d ago
Flights observed
161
Distinct callsigns
1
Country
DK
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S 4598CA.

Country allocation

The ICAO 24-bit address 4598CA 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
OYFFJ - 161 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 OYFFJ RKE → RKE Jul 13, 06:55 UTCJul 13, 08:01 UTC1h 5m
2026-07-12 OYFFJ RKE → RKE Jul 12, 10:45 UTCJul 12, 12:40 UTC1h 55m
2026-07-12 OYFFJ ODE → RKE Jul 12, 09:00 UTCJul 12, 09:50 UTC50m
2026-07-12 OYFFJ - Jul 12, 07:45 UTCJul 12, 08:30 UTC45m
2026-07-10 OYFFJ - Jul 10, 12:25 UTCJul 10, 14:05 UTC1h 40m
2026-07-10 OYFFJ RKE → RKE Jul 10, 08:50 UTCJul 10, 09:50 UTC1h 0m
2026-07-09 OYFFJ - Jul 9, 14:35 UTCJul 9, 16:10 UTC1h 35m
2026-07-09 OYFFJ - Jul 9, 10:55 UTCJul 9, 11:45 UTC50m
2026-07-09 OYFFJ - Jul 9, 09:25 UTCJul 9, 10:15 UTC50m
2026-07-08 OYFFJ - Jul 8, 12:15 UTCJul 8, 12:55 UTC40m
2026-07-08 OYFFJ - Jul 8, 10:05 UTCJul 8, 10:45 UTC40m
2026-07-08 OYFFJ RKE → RKE Jul 8, 07:10 UTCJul 8, 07:55 UTC45m
2026-07-07 OYFFJ - Jul 7, 11:10 UTCJul 7, 12:45 UTC1h 35m
2026-07-07 OYFFJ - Jul 7, 08:50 UTCJul 7, 10:00 UTC1h 10m
2026-07-06 OYFFJ RKE → RKE Jul 6, 08:05 UTCJul 6, 09:20 UTC1h 15m
2026-07-01 OYFFJ RKE → RKE Jul 1, 14:05 UTCJul 1, 15:05 UTC1h 0m
2026-07-01 OYFFJ - Jul 1, 06:15 UTCJul 1, 07:45 UTC1h 30m
2026-06-30 OYFFJ RKE → RKE Jun 30, 13:10 UTCJun 30, 14:30 UTC1h 20m
2026-06-30 OYFFJ RKE → RKE Jun 30, 10:20 UTCJun 30, 11:35 UTC1h 15m
2026-06-29 OYFFJ RKE → RKE Jun 29, 15:19 UTCJun 29, 16:44 UTC1h 25m
2026-06-29 OYFFJ - Jun 29, 09:20 UTCJun 29, 10:20 UTC1h 0m
2026-06-28 OYFFJ RKE → RKE Jun 28, 15:55 UTCJun 28, 16:39 UTC45m
2026-06-28 OYFFJ - Jun 28, 13:14 UTCJun 28, 14:09 UTC55m
2026-06-25 OYFFJ - Jun 25, 08:34 UTCJun 25, 09:40 UTC1h 5m
2026-06-25 OYFFJ RKE → RKE Jun 25, 06:05 UTCJun 25, 07:15 UTC1h 10m
2026-06-24 OYFFJ - Jun 24, 13:05 UTCJun 24, 13:14 UTC10m
2026-06-24 OYFFJ - Jun 24, 11:59 UTCJun 24, 12:34 UTC35m
2026-06-24 OYFFJ RKE → RKE Jun 24, 09:00 UTCJun 24, 10:25 UTC1h 25m
2026-06-24 OYFFJ - Jun 24, 06:29 UTCJun 24, 07:50 UTC1h 20m
2026-06-23 OYFFJ - Jun 23, 15:34 UTCJun 23, 18:25 UTC2h 50m
2026-06-23 OYFFJ RKE → RKE Jun 23, 12:55 UTCJun 23, 14:19 UTC1h 25m
2026-06-23 OYFFJ - Jun 23, 09:59 UTCJun 23, 11:29 UTC1h 30m
2026-06-23 OYFFJ RKE → RKE Jun 23, 07:15 UTCJun 23, 08:50 UTC1h 35m
2026-06-22 OYFFJ - Jun 22, 16:40 UTCJun 22, 18:00 UTC1h 20m
2026-06-22 OYFFJ RKE → RKE Jun 22, 13:54 UTCJun 22, 15:20 UTC1h 25m
2026-06-22 OYFFJ - Jun 22, 10:34 UTCJun 22, 11:14 UTC40m
2026-06-22 OYFFJ RKE → RKE Jun 22, 07:40 UTCJun 22, 07:49 UTC10m
2026-06-21 OYFFJ RKE → RKE Jun 21, 12:04 UTCJun 21, 13:59 UTC1h 55m
2026-06-21 OYFFJ - Jun 21, 09:10 UTCJun 21, 11:05 UTC1h 55m
2026-06-20 OYFFJ RKE → RKE Jun 20, 07:29 UTCJun 20, 08:14 UTC45m
2026-06-19 OYFFJ - Jun 19, 15:54 UTCJun 19, 17:24 UTC1h 30m
2026-06-19 OYFFJ - Jun 19, 12:49 UTCJun 19, 13:54 UTC1h 5m
2026-06-19 OYFFJ - Jun 19, 10:44 UTCJun 19, 11:45 UTC1h 0m
2026-06-19 OYFFJ - Jun 19, 06:54 UTCJun 19, 08:54 UTC2h 0m
2026-06-18 OYFFJ RKE → RKE Jun 18, 16:30 UTCJun 18, 17:50 UTC1h 20m
2026-06-18 OYFFJ - Jun 18, 14:40 UTCJun 18, 15:40 UTC1h 0m
2026-06-18 OYFFJ - Jun 18, 11:15 UTCJun 18, 12:55 UTC1h 40m
2026-06-18 OYFFJ - Jun 18, 07:45 UTCJun 18, 09:05 UTC1h 20m
2026-06-17 OYFFJ - Jun 17, 15:46 UTCJun 17, 16:55 UTC1h 10m
2026-06-17 OYFFJ - Jun 17, 13:10 UTCJun 17, 14:30 UTC1h 20m

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

Mode-S 4598CA frequently asked

What is Mode-S code 4598CA?
4598CA is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-FFJ.
Where is Mode-S 4598CA registered?
Mode-S code 4598CA is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4598CA broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4598CA, octal 21314312, decimal 4,561,098.
What flights does 4598CA operate?
Mode-S 4598CA has broadcast 1 distinct callsign, including OYFFJ.