Apparatus

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sensors Mode-S transponder

4598C1

ICAO 24-bit transponder address · allocated to Denmark

Hex
4598C1
Octal
21314301
Decimal
4,561,089
Country
DK
No current signal · last broadcast 6d ago
Flights observed
66
Distinct callsigns
1
Country
DK
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S 4598C1.

Country allocation

The ICAO 24-bit address 4598C1 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
OYFFA - 66 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-08 OYFFA - Jul 8, 11:35 UTCJul 8, 12:55 UTC1h 20m
2026-07-08 OYFFA - Jul 8, 08:10 UTCJul 8, 09:25 UTC1h 15m
2026-07-07 OYFFA RKE → RKE Jul 7, 08:35 UTCJul 7, 09:55 UTC1h 20m
2026-07-06 OYFFA RKE → RKE Jul 6, 12:25 UTCJul 6, 13:50 UTC1h 25m
2026-07-06 OYFFA - Jul 6, 06:55 UTCJul 6, 07:45 UTC50m
2026-07-02 OYFFA - Jul 2, 15:50 UTCJul 2, 17:05 UTC1h 15m
2026-07-02 OYFFA - Jul 2, 13:35 UTCJul 2, 15:00 UTC1h 25m
2026-07-01 OYFFA - Jul 1, 14:50 UTCJul 1, 16:10 UTC1h 20m
2026-07-01 OYFFA RKE → RKE Jul 1, 12:20 UTCJul 1, 13:50 UTC1h 30m
2026-07-01 OYFFA RKE → RKE Jul 1, 10:30 UTCJul 1, 11:25 UTC55m
2026-07-01 OYFFA - Jul 1, 08:20 UTCJul 1, 09:25 UTC1h 5m
2026-06-30 OYFFA - Jun 30, 10:10 UTCJun 30, 11:05 UTC55m
2026-06-30 OYFFA - Jun 30, 08:05 UTCJun 30, 09:15 UTC1h 10m
2026-06-26 OYFFA - Jun 26, 09:24 UTCJun 26, 10:30 UTC1h 5m
2026-06-26 OYFFA - Jun 26, 07:05 UTCJun 26, 08:10 UTC1h 5m
2026-06-25 OYFFA - Jun 25, 13:40 UTCJun 25, 14:44 UTC1h 5m
2026-06-25 OYFFA - Jun 25, 11:39 UTCJun 25, 12:44 UTC1h 5m
2026-06-25 OYFFA - Jun 25, 09:10 UTCJun 25, 10:20 UTC1h 10m
2026-06-25 OYFFA - Jun 25, 06:40 UTCJun 25, 07:59 UTC1h 20m
2026-06-24 OYFFA - Jun 24, 11:59 UTCJun 24, 13:10 UTC1h 10m
2026-06-24 OYFFA RKE → RKE Jun 24, 09:09 UTCJun 24, 10:25 UTC1h 15m
2026-06-24 OYFFA - Jun 24, 07:05 UTCJun 24, 08:09 UTC1h 5m
2026-06-23 OYFFA - Jun 23, 11:49 UTCJun 23, 12:35 UTC45m
2026-06-23 OYFFA RKE → RKE Jun 23, 09:40 UTCJun 23, 10:39 UTC1h 0m
2026-06-22 OYFFA - Jun 22, 13:10 UTCJun 22, 14:14 UTC1h 5m
2026-06-22 OYFFA - Jun 22, 11:00 UTCJun 22, 12:05 UTC1h 5m
2026-06-22 OYFFA - Jun 22, 08:44 UTCJun 22, 10:00 UTC1h 15m
2026-06-19 OYFFA - Jun 19, 11:09 UTCJun 19, 12:29 UTC1h 20m
2026-06-19 OYFFA RKE → RKE Jun 19, 08:44 UTCJun 19, 10:09 UTC1h 25m
2026-06-18 OYFFA - Jun 18, 11:40 UTCJun 18, 12:45 UTC1h 5m
2026-06-17 OYFFA RKE → RKE Jun 17, 12:05 UTCJun 17, 13:15 UTC1h 10m
2026-06-17 OYFFA RKE → RKE Jun 17, 10:05 UTCJun 17, 11:15 UTC1h 10m
2026-06-17 OYFFA - Jun 17, 07:40 UTCJun 17, 08:45 UTC1h 5m
2026-06-16 OYFFA RKE → RKE Jun 16, 08:10 UTCJun 16, 09:25 UTC1h 15m
2026-06-15 OYFFA - Jun 15, 12:10 UTCJun 15, 13:30 UTC1h 20m
2026-06-15 OYFFA - Jun 15, 09:40 UTCJun 15, 10:45 UTC1h 5m
2026-06-14 OYFFA - Jun 14, 15:00 UTCJun 14, 16:15 UTC1h 15m
2026-06-14 OYFFA - Jun 14, 12:25 UTCJun 14, 13:30 UTC1h 5m
2026-06-13 OYFFA - Jun 13, 09:30 UTCJun 13, 10:40 UTC1h 10m
2026-06-12 OYFFA - Jun 12, 15:05 UTCJun 12, 16:10 UTC1h 5m
2026-06-12 OYFFA - Jun 12, 13:05 UTCJun 12, 14:15 UTC1h 10m
2026-05-15 OYFFA - May 15, 13:40 UTCMay 15, 14:35 UTC55m
2026-05-15 OYFFA - May 15, 10:50 UTCMay 15, 12:00 UTC1h 10m
2026-05-13 OYFFA RKE → RKE May 13, 12:10 UTCMay 13, 13:10 UTC1h 0m
2026-05-12 OYFFA - May 12, 07:30 UTCMay 12, 08:40 UTC1h 10m
2026-05-04 OYFFA - May 4, 12:05 UTCMay 4, 13:20 UTC1h 15m
2026-05-04 OYFFA - May 4, 09:35 UTCMay 4, 10:50 UTC1h 15m
2026-04-29 OYFFA - Apr 29, 11:45 UTCApr 29, 12:55 UTC1h 10m
2026-04-29 OYFFA - Apr 29, 09:25 UTCApr 29, 10:30 UTC1h 5m
2026-04-27 OYFFA RKE → RKE Apr 27, 10:50 UTCApr 27, 12:50 UTC2h 0m

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.

Mode-S 4598C1 frequently asked

What is Mode-S code 4598C1?
4598C1 is an ICAO 24-bit transponder address. Allocated to Denmark.
Where is Mode-S 4598C1 registered?
Mode-S code 4598C1 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4598C1 broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4598C1, octal 21314301, decimal 4,561,089.
What flights does 4598C1 operate?
Mode-S 4598C1 has broadcast 1 distinct callsign, including OYFFA.