Apparatus

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sensors Mode-S transponder

458665

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-ASE · BOEING 737-800

Hex
458665
Octal
21303145
Decimal
4,556,389
Country
DK
Tail
OY-ASE
Type
B738
No current signal · last broadcast 1h ago
Flights observed
120
Distinct callsigns
20
Country
DK
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 458665.

Country allocation

The ICAO 24-bit address 458665 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
CAT319 Copenhagen Airtaxi 7 2026-06-21
CAT318 - 7 2026-06-21
CAT315 - 7 2026-06-20
CAT314 - 7 2026-06-20
CAT313 Copenhagen Airtaxi 7 2026-06-20
CAT320 - 6 2026-06-21
CAT317 Copenhagen Airtaxi 6 2026-06-21
CAT316 Copenhagen Airtaxi 6 2026-06-20
CAT312 - 6 2026-06-19
CAT311 - 4 2026-06-05
CAT9567 - 3 2026-06-09
CAT772 - 3 2026-06-08
CAT771 - 3 2026-06-08
CAT567 - 3 2026-06-09
CAT9568 - 2 2026-06-11
CAT9516 - 2 2026-06-04
CAT9502 - 2 2026-05-29
CAT9501 - 2 2026-05-27
CAT568 - 2 2026-06-11
CAT502 - 2 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-21 CAT320 - Jun 21, 19:24 UTCJun 21, 22:49 UTC3h 25m
2026-06-21 CAT319 AAR → CHQ Jun 21, 14:54 UTCJun 21, 18:04 UTC3h 10m
2026-06-21 CAT318 - Jun 21, 08:54 UTCJun 21, 11:55 UTC3h 0m
2026-06-21 CAT317 AAR → ZTH Jun 21, 04:34 UTCJun 21, 07:25 UTC2h 50m
2026-06-20 CAT314 - Jun 20, 21:55 UTCJun 21, 00:34 UTC2h 40m
2026-06-20 CAT313 BLL → PMI Jun 20, 16:14 UTCJun 20, 18:54 UTC2h 40m
2026-06-20 CAT316 PFO → AAR Jun 20, 10:04 UTCJun 20, 13:49 UTC3h 45m
2026-06-20 CAT315 - Jun 20, 05:14 UTCJun 20, 08:55 UTC3h 40m
2026-06-19 CAT312 - Jun 19, 14:24 UTCJun 19, 21:24 UTC7h 0m
2026-06-19 CAT9328 - Jun 19, 08:29 UTCJun 19, 11:39 UTC3h 10m
2026-06-19 CAT327 - Jun 19, 04:29 UTCJun 19, 07:19 UTC2h 50m
2026-06-18 CAT9540 - Jun 18, 14:25 UTCJun 18, 15:05 UTC40m
2026-06-18 CAT539 - Jun 18, 06:20 UTCJun 18, 13:20 UTC7h 0m
2026-06-17 CAT9574 - Jun 17, 15:10 UTCJun 17, 18:10 UTC3h 0m
2026-06-17 CAT574 - Jun 17, 10:10 UTCJun 17, 12:35 UTC2h 25m
2026-06-16 CAT572 - Jun 16, 09:30 UTCJun 16, 10:04 UTC35m
2026-06-16 CAT9572 - Jun 16, 07:50 UTCJun 16, 08:25 UTC35m
2026-06-15 CAT9542 - Jun 15, 11:49 UTCJun 15, 13:15 UTC1h 25m
2026-06-15 CAT542 - Jun 15, 08:45 UTCJun 15, 10:35 UTC1h 50m
2026-06-15 CAT9541 - Jun 15, 04:20 UTCJun 15, 06:30 UTC2h 10m
2026-06-14 CAT320 - Jun 14, 19:20 UTCJun 14, 22:45 UTC3h 25m
2026-06-14 CAT319 AAR → CHQ Jun 14, 14:25 UTCJun 14, 17:20 UTC2h 55m
2026-06-14 CAT318 - Jun 14, 09:05 UTCJun 14, 12:20 UTC3h 15m
2026-06-14 CAT317 AAR → ZTH Jun 14, 04:30 UTCJun 14, 07:10 UTC2h 40m
2026-06-13 CAT314 - Jun 13, 20:30 UTCJun 13, 23:10 UTC2h 40m
2026-06-13 CAT313 BLL → PMI Jun 13, 15:55 UTCJun 13, 18:35 UTC2h 40m
2026-06-13 CAT316 PFO → AAR Jun 13, 09:25 UTCJun 13, 13:35 UTC4h 10m
2026-06-13 CAT315 - Jun 13, 04:40 UTCJun 13, 08:10 UTC3h 30m
2026-06-12 CAT312 - Jun 12, 14:25 UTCJun 12, 21:30 UTC7h 5m
2026-06-11 CAT9568 - Jun 11, 15:55 UTCJun 11, 16:10 UTC15m
2026-06-11 CAT568 - Jun 11, 14:00 UTCJun 11, 15:20 UTC1h 20m
2026-06-09 CAT567 - Jun 9, 06:05 UTCJun 9, 07:30 UTC1h 25m
2026-06-09 CAT9567 - Jun 9, 04:45 UTCJun 9, 05:05 UTC20m
2026-06-08 CAT772 - Jun 8, 10:25 UTCJun 8, 14:00 UTC3h 35m
2026-06-08 CAT771 - Jun 8, 05:00 UTCJun 8, 08:15 UTC3h 15m
2026-06-07 CAT9771 - Jun 7, 23:45 UTCJun 8, 00:05 UTC20m
2026-06-07 CAT320 - Jun 7, 19:10 UTCJun 7, 22:35 UTC3h 25m
2026-06-07 CAT319 AAR → CHQ Jun 7, 14:40 UTCJun 7, 17:45 UTC3h 5m
2026-06-07 CAT318 ZTH → AAL Jun 7, 09:10 UTCJun 7, 12:05 UTC2h 55m
2026-06-07 CAT317 AAR → ZTH Jun 7, 04:35 UTCJun 7, 07:35 UTC3h 0m
2026-06-06 CAT314 - Jun 6, 20:10 UTCJun 6, 22:39 UTC2h 30m
2026-06-06 CAT313 BLL → PMI Jun 6, 15:44 UTCJun 6, 18:25 UTC2h 40m
2026-06-06 CAT316 PFO → AAR Jun 6, 10:30 UTCJun 6, 13:44 UTC3h 15m
2026-06-06 CAT315 AAR → PFO Jun 6, 04:50 UTCJun 6, 07:55 UTC3h 5m
2026-06-05 CAT312 - Jun 5, 18:45 UTCJun 5, 21:25 UTC2h 40m
2026-06-05 CAT311 - Jun 5, 15:00 UTCJun 5, 17:45 UTC2h 45m
2026-06-04 CAT9516 - Jun 4, 03:50 UTCJun 4, 04:10 UTC20m
2026-06-03 CAT516 - Jun 3, 23:45 UTCJun 4, 00:50 UTC1h 5m
2026-06-03 CAT9516 - Jun 3, 20:00 UTCJun 3, 20:10 UTC10m
2026-06-02 CAT515 - Jun 2, 14:15 UTCJun 2, 15:30 UTC1h 15m

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

Mode-S 458665 frequently asked

What is Mode-S code 458665?
458665 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-ASE.
Where is Mode-S 458665 registered?
Mode-S code 458665 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 458665 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 458665, octal 21303145, decimal 4,556,389.
What flights does 458665 operate?
Mode-S 458665 has broadcast 20 distinct callsigns, including CAT319, CAT318, CAT315, CAT314, CAT313.