Apparatus

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sensors Mode-S transponder

4598CD

ICAO 24-bit transponder address · allocated to Denmark

Hex
4598CD
Octal
21314315
Decimal
4,561,101
Country
DK
No current signal · last broadcast 12d ago
Flights observed
51
Distinct callsigns
1
Country
DK
Last broadcast
12d ago

Last known position

Most recent position reported by Mode-S 4598CD.

Country allocation

The ICAO 24-bit address 4598CD 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
OYFFM - 51 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 OYFFM - Jul 26, 11:10 UTCJul 26, 12:55 UTC1h 45m
2026-07-26 OYFFM RKE → RKE Jul 26, 08:20 UTCJul 26, 10:20 UTC2h 0m
2026-07-25 OYFFM - Jul 25, 14:15 UTCJul 25, 16:10 UTC1h 55m
2026-07-25 OYFFM - Jul 25, 08:35 UTCJul 25, 09:40 UTC1h 5m
2026-07-25 OYFFM RKE → RKE Jul 25, 06:35 UTCJul 25, 07:20 UTC45m
2026-07-24 OYFFM - Jul 24, 12:15 UTCJul 24, 14:00 UTC1h 45m
2026-07-24 OYFFM - Jul 24, 09:55 UTCJul 24, 10:50 UTC55m
2026-07-24 OYFFM - Jul 24, 07:05 UTCJul 24, 08:00 UTC55m
2026-07-23 OYFFM - Jul 23, 12:40 UTCJul 23, 13:20 UTC40m
2026-07-23 OYFFM RKE → RKE Jul 23, 08:50 UTCJul 23, 10:15 UTC1h 25m
2026-07-22 OYFFM - Jul 22, 11:20 UTCJul 22, 12:00 UTC40m
2026-07-21 OYFFM - Jul 21, 16:30 UTCJul 21, 17:45 UTC1h 15m
2026-07-21 OYFFM RKE → RKE Jul 21, 13:15 UTCJul 21, 14:35 UTC1h 20m
2026-07-21 OYFFM - Jul 21, 10:30 UTCJul 21, 11:00 UTC30m
2026-07-17 OYFFM RKE → RKE Jul 17, 15:20 UTCJul 17, 15:55 UTC35m
2026-07-17 OYFFM RKE → RKE Jul 17, 11:15 UTCJul 17, 12:15 UTC1h 0m
2026-07-17 OYFFM - Jul 17, 08:59 UTCJul 17, 10:00 UTC1h 0m
2026-07-17 OYFFM RKE → RKE Jul 17, 07:00 UTCJul 17, 08:00 UTC1h 0m
2026-07-16 OYFFM - Jul 16, 14:20 UTCJul 16, 15:40 UTC1h 20m
2026-07-16 OYFFM - Jul 16, 12:09 UTCJul 16, 13:10 UTC1h 0m
2026-07-16 OYFFM - Jul 16, 09:10 UTCJul 16, 10:29 UTC1h 20m
2026-07-16 OYFFM - Jul 16, 06:45 UTCJul 16, 07:25 UTC40m
2026-07-15 OYFFM RKE → RKE Jul 15, 14:40 UTCJul 15, 15:10 UTC30m
2026-07-15 OYFFM RKE → RKE Jul 15, 13:45 UTCJul 15, 13:55 UTC10m
2026-07-15 OYFFM RKE → RKE Jul 15, 11:40 UTCJul 15, 12:05 UTC25m
2026-07-15 OYFFM - Jul 15, 10:45 UTCJul 15, 11:00 UTC15m
2026-07-15 OYFFM - Jul 15, 08:25 UTCJul 15, 09:15 UTC50m
2026-07-15 OYFFM - Jul 15, 07:00 UTCJul 15, 07:40 UTC40m
2026-07-14 OYFFM RKE → RKE Jul 14, 16:15 UTCJul 14, 16:40 UTC25m
2026-07-14 OYFFM RKE → RKE Jul 14, 15:30 UTCJul 14, 15:40 UTC10m
2026-07-14 OYFFM RKE → RKE Jul 14, 11:50 UTCJul 14, 12:15 UTC25m
2026-07-14 OYFFM RKE → RKE Jul 14, 11:05 UTCJul 14, 11:15 UTC10m
2026-07-13 OYFFM RKE → RKE Jul 13, 07:20 UTCJul 13, 08:25 UTC1h 5m
2026-07-12 OYFFM - Jul 12, 12:50 UTCJul 12, 13:35 UTC45m
2026-07-12 OYFFM - Jul 12, 10:45 UTCJul 12, 11:45 UTC1h 0m
2026-07-12 OYFFM - Jul 12, 08:55 UTCJul 12, 09:40 UTC45m
2026-07-12 OYFFM - Jul 12, 07:20 UTCJul 12, 08:05 UTC45m
2026-07-10 OYFFM RKE → RKE Jul 10, 11:35 UTCJul 10, 12:55 UTC1h 20m
2026-07-10 OYFFM RKE → RKE Jul 10, 08:30 UTCJul 10, 09:55 UTC1h 25m
2026-07-09 OYFFM - Jul 9, 11:35 UTCJul 9, 13:15 UTC1h 40m
2026-07-08 OYFFM - Jul 8, 15:00 UTCJul 8, 15:45 UTC45m
2026-07-08 OYFFM - Jul 8, 10:30 UTCJul 8, 11:45 UTC1h 15m
2026-07-08 OYFFM - Jul 8, 08:15 UTCJul 8, 09:30 UTC1h 15m
2026-07-06 OYFFM - Jul 6, 06:45 UTCJul 6, 07:45 UTC1h 0m
2026-06-24 OYFFM - Jun 24, 17:55 UTCJun 24, 18:34 UTC40m
2026-06-24 OYFFM RKE → RKE Jun 24, 08:35 UTCJun 24, 09:49 UTC1h 15m
2026-06-24 OYFFM - Jun 24, 06:39 UTCJun 24, 07:50 UTC1h 10m
2026-06-23 OYFFM - Jun 23, 12:40 UTCJun 23, 13:19 UTC40m
2026-06-22 OYFFM - Jun 22, 12:40 UTCJun 22, 13:39 UTC1h 0m
2026-06-22 OYFFM - Jun 22, 09:45 UTCJun 22, 11:09 UTC1h 25m

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 4598CD frequently asked

What is Mode-S code 4598CD?
4598CD is an ICAO 24-bit transponder address. Allocated to Denmark.
Where is Mode-S 4598CD registered?
Mode-S code 4598CD is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4598CD broadcasting right now?
No active broadcast right now. Last signal was 12d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4598CD, octal 21314315, decimal 4,561,101.
What flights does 4598CD operate?
Mode-S 4598CD has broadcast 1 distinct callsign, including OYFFM.