Apparatus

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sensors Mode-S transponder

458D9A

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-CLZ · ATR-72-500

Hex
458D9A
Octal
21306632
Decimal
4,558,234
Country
DK
Tail
OY-CLZ
Type
AT75
No current signal · last broadcast Jul 24, 15:50 UTC
Flights observed
436
Distinct callsigns
20
Country
DK
Last broadcast
Jul 24, 15:50 UTC

Last known position

Most recent position reported by Mode-S 458D9A.

Country allocation

The ICAO 24-bit address 458D9A 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
MMD107 Air Alsie 41 2026-07-24
MMD108 Air Alsie 40 2026-07-24
MMD102 Air Alsie 39 2026-07-24
MMD101 Air Alsie 38 2026-07-24
MMD352 - 27 2026-06-28
MMD106 Air Alsie 26 2026-06-26
MMD103 - 25 2026-06-24
MMD359 - 23 2026-06-25
MMD353 - 21 2026-06-24
MMD358 - 20 2026-06-25
MMD110 - 19 2026-07-12
MMD354 - 17 2026-06-24
MMD109 - 17 2026-07-12
MMD357 - 11 2026-06-23
MMD105 - 9 2026-06-26
MMD115 - 7 2026-06-27
MMD758 - 6 2026-07-11
MMD122 - 6 2026-06-28
MMD121 - 6 2026-06-28
MMD116 - 6 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 MMD108 CPH → SGD Jul 24, 15:20 UTCJul 24, 15:50 UTC30m
2026-07-24 MMD107 SGD → CPH Jul 24, 14:00 UTCJul 24, 14:35 UTC35m
2026-07-24 MMD202 RNN → SGD Jul 24, 09:45 UTCJul 24, 10:25 UTC40m
2026-07-24 MMD201 SGD → RNN Jul 24, 07:50 UTCJul 24, 08:30 UTC40m
2026-07-24 MMD102 CPH → SGD Jul 24, 06:20 UTCJul 24, 06:50 UTC30m
2026-07-24 MMD101 SGD → CPH Jul 24, 04:55 UTCJul 24, 05:30 UTC35m
2026-07-23 MMD108 CPH → SGD Jul 23, 15:20 UTCJul 23, 15:50 UTC30m
2026-07-23 MMD107 SGD → CPH Jul 23, 13:50 UTCJul 23, 14:20 UTC30m
2026-07-23 MMD102 CPH → SGD Jul 23, 06:25 UTCJul 23, 07:00 UTC35m
2026-07-23 MMD101 SGD → CPH Jul 23, 05:05 UTCJul 23, 05:35 UTC30m
2026-07-22 MMD108 CPH → SGD Jul 22, 15:00 UTCJul 22, 15:35 UTC35m
2026-07-22 MMD107 - Jul 22, 13:50 UTCJul 22, 14:25 UTC35m
2026-07-22 MMD101 SGD → CPH Jul 22, 05:00 UTCJul 22, 05:25 UTC25m
2026-07-21 MMD108 CPH → SGD Jul 21, 15:10 UTCJul 21, 15:40 UTC30m
2026-07-21 MMD107 - Jul 21, 13:50 UTCJul 21, 14:20 UTC30m
2026-07-21 MMD102 - Jul 21, 06:20 UTCJul 21, 06:50 UTC30m
2026-07-21 MMD101 SGD → CPH Jul 21, 05:10 UTCJul 21, 05:40 UTC30m
2026-07-20 MMD108 CPH → SGD Jul 20, 15:15 UTCJul 20, 15:45 UTC30m
2026-07-20 MMD107 SGD → CPH Jul 20, 13:45 UTCJul 20, 14:20 UTC35m
2026-07-20 MMD202 RNN → SGD Jul 20, 09:40 UTCJul 20, 10:15 UTC35m
2026-07-20 MMD201 SGD → RNN Jul 20, 07:55 UTCJul 20, 08:35 UTC40m
2026-07-20 MMD102 - Jul 20, 06:35 UTCJul 20, 07:05 UTC30m
2026-07-20 MMD101 SGD → CPH Jul 20, 05:00 UTCJul 20, 05:30 UTC30m
2026-07-15 MMD108 - Jul 15, 15:10 UTCJul 15, 15:40 UTC30m
2026-07-15 MMD107 - Jul 15, 13:50 UTCJul 15, 14:20 UTC30m
2026-07-15 MMD102 - Jul 15, 06:45 UTCJul 15, 07:15 UTC30m
2026-07-15 MMD101 - Jul 15, 05:10 UTCJul 15, 05:45 UTC35m
2026-07-14 MMD108 - Jul 14, 15:25 UTCJul 14, 15:55 UTC30m
2026-07-14 MMD107 - Jul 14, 13:55 UTCJul 14, 14:30 UTC35m
2026-07-14 MMD102 - Jul 14, 06:50 UTCJul 14, 07:20 UTC30m
2026-07-14 MMD101 SGD → CPH Jul 14, 05:25 UTCJul 14, 06:00 UTC35m
2026-07-13 MMD108 CPH → SGD Jul 13, 15:10 UTCJul 13, 15:40 UTC30m
2026-07-13 MMD107 - Jul 13, 13:50 UTCJul 13, 14:20 UTC30m
2026-07-13 MMD202 - Jul 13, 09:35 UTCJul 13, 10:15 UTC40m
2026-07-13 MMD201 - Jul 13, 08:01 UTCJul 13, 08:40 UTC40m
2026-07-13 MMD102 - Jul 13, 06:35 UTCJul 13, 07:05 UTC30m
2026-07-13 MMD101 - Jul 13, 05:10 UTCJul 13, 05:40 UTC30m
2026-07-12 MMD110 - Jul 12, 17:40 UTCJul 12, 18:10 UTC30m
2026-07-12 MMD109 - Jul 12, 16:30 UTCJul 12, 16:55 UTC25m
2026-07-12 MMD108 CPH → SGD Jul 12, 15:20 UTCJul 12, 15:50 UTC30m
2026-07-12 MMD107 - Jul 12, 13:55 UTCJul 12, 14:25 UTC30m
2026-07-11 MMD758 - Jul 11, 14:05 UTCJul 11, 14:30 UTC25m
2026-07-11 MMD758 - Jul 11, 12:40 UTCJul 11, 13:25 UTC45m
2026-07-11 MMD758 - Jul 11, 10:55 UTCJul 11, 11:20 UTC25m
2026-07-08 MMD758 - Jul 8, 10:40 UTCJul 8, 11:00 UTC20m
2026-07-08 MMD758 HAM → RKE Jul 8, 09:25 UTCJul 8, 10:10 UTC45m
2026-07-08 MMD758 - Jul 8, 07:10 UTCJul 8, 07:40 UTC30m
2026-07-03 MMD108 - Jul 3, 15:35 UTCJul 3, 16:05 UTC30m
2026-07-03 MMD107 SGD → CPH Jul 3, 14:05 UTCJul 3, 14:45 UTC40m
2026-07-03 MMD202 - Jul 3, 09:35 UTCJul 3, 10:20 UTC45m

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

Mode-S 458D9A frequently asked

What is Mode-S code 458D9A?
458D9A is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-CLZ.
Where is Mode-S 458D9A registered?
Mode-S code 458D9A is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 458D9A broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 15:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 458D9A, octal 21306632, decimal 4,558,234.
What flights does 458D9A operate?
Mode-S 458D9A has broadcast 20 distinct callsigns, including MMD107, MMD108, MMD102, MMD101, MMD352.