Apparatus

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sensors Mode-S transponder

458664

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-ASD · BOEING 737-800

Hex
458664
Octal
21303144
Decimal
4,556,388
Country
DK
Tail
OY-ASD
Type
B738
No current signal · last broadcast 4h ago
Flights observed
254
Distinct callsigns
20
Country
DK
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 458664.

Country allocation

The ICAO 24-bit address 458664 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
CAT754 - 14 2026-07-10
CAT753 - 13 2026-07-10
CAT759 - 11 2026-07-13
CAT745 - 11 2026-07-12
CAT760 - 10 2026-07-13
CAT756 - 10 2026-07-13
CAT755 - 10 2026-07-13
CAT751 - 10 2026-07-11
CAT746 - 10 2026-07-12
CAT643 - 10 2026-07-08
CAT341 - 10 2026-07-11
CAT302 - 10 2026-07-12
CAT301 - 10 2026-07-12
CAT752 - 9 2026-07-11
CAT645 - 9 2026-07-08
CAT346 - 9 2026-07-10
CAT342 - 9 2026-07-11
CAT644 - 8 2026-07-08
CAT646 - 7 2026-07-08
CAT345 - 7 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CAT756 RHO → AAL Jul 13, 19:10 UTCJul 13, 22:45 UTC3h 35m
2026-07-13 CAT755 - Jul 13, 14:20 UTCJul 13, 17:45 UTC3h 25m
2026-07-13 CAT760 - Jul 13, 09:35 UTCJul 13, 12:40 UTC3h 5m
2026-07-13 CAT759 - Jul 13, 05:35 UTCJul 13, 08:25 UTC2h 50m
2026-07-12 CAT746 - Jul 12, 19:30 UTCJul 12, 22:10 UTC2h 40m
2026-07-12 CAT745 - Jul 12, 15:30 UTCJul 12, 18:15 UTC2h 45m
2026-07-12 CAT302 - Jul 12, 09:50 UTCJul 12, 13:20 UTC3h 30m
2026-07-12 CAT301 - Jul 12, 04:15 UTCJul 12, 07:25 UTC3h 10m
2026-07-11 CAT752 ATH → AAL Jul 11, 19:40 UTCJul 11, 22:50 UTC3h 10m
2026-07-11 CAT751 - Jul 11, 14:55 UTCJul 11, 17:50 UTC2h 55m
2026-07-11 CAT342 - Jul 11, 09:20 UTCJul 11, 13:00 UTC3h 40m
2026-07-11 CAT341 AAL → RHO Jul 11, 04:05 UTCJul 11, 07:30 UTC3h 25m
2026-07-10 CAT754 - Jul 10, 21:35 UTCJul 11, 01:05 UTC3h 30m
2026-07-10 CAT753 - Jul 10, 17:05 UTCJul 10, 20:10 UTC3h 5m
2026-07-10 CAT346 - Jul 10, 05:10 UTCJul 10, 12:35 UTC7h 25m
2026-07-09 CAT9540 OSL → AAL Jul 9, 15:35 UTCJul 9, 16:10 UTC35m
2026-07-09 CAT539 - Jul 9, 07:45 UTCJul 9, 14:30 UTC6h 45m
2026-07-09 CAT9539 - Jul 9, 05:05 UTCJul 9, 05:45 UTC40m
2026-07-08 CAT644 - Jul 8, 16:40 UTCJul 8, 19:40 UTC3h 0m
2026-07-08 CAT645 - Jul 8, 12:40 UTCJul 8, 15:10 UTC2h 30m
2026-07-08 CAT646 - Jul 8, 08:30 UTCJul 8, 11:20 UTC2h 50m
2026-07-08 CAT643 - Jul 8, 04:30 UTCJul 8, 06:45 UTC2h 15m
2026-07-07 GRL751 - Jul 7, 11:15 UTCJul 7, 21:10 UTC9h 55m
2026-07-06 CAT756 - Jul 6, 19:40 UTCJul 6, 23:20 UTC3h 40m
2026-07-06 CAT755 - Jul 6, 14:10 UTCJul 6, 17:30 UTC3h 20m
2026-07-06 CAT760 - Jul 6, 08:35 UTCJul 6, 11:55 UTC3h 20m
2026-07-06 CAT759 - Jul 6, 04:10 UTCJul 6, 07:05 UTC2h 55m
2026-07-05 CAT746 - Jul 5, 19:45 UTCJul 5, 22:40 UTC2h 55m
2026-07-05 CAT745 - Jul 5, 15:20 UTCJul 5, 17:50 UTC2h 30m
2026-07-05 CAT302 - Jul 5, 09:35 UTCJul 5, 13:10 UTC3h 35m
2026-07-05 CAT301 AAR → TFS Jul 5, 04:15 UTCJul 5, 07:25 UTC3h 10m
2026-07-04 CAT752 ATH → AAL Jul 4, 20:05 UTCJul 4, 23:25 UTC3h 20m
2026-07-04 CAT751 - Jul 4, 15:05 UTCJul 4, 18:00 UTC2h 55m
2026-07-04 CAT342 RHO → AAL Jul 4, 10:05 UTCJul 4, 13:50 UTC3h 45m
2026-07-04 CAT341 AAL → RHO Jul 4, 04:05 UTCJul 4, 07:15 UTC3h 10m
2026-07-03 CAT754 - Jul 3, 21:30 UTCJul 4, 01:05 UTC3h 35m
2026-07-03 CAT753 - Jul 3, 16:45 UTCJul 3, 19:55 UTC3h 10m
2026-07-03 CAT346 - Jul 3, 09:50 UTCJul 3, 12:35 UTC2h 45m
2026-07-03 CAT345 - Jul 3, 05:15 UTCJul 3, 07:40 UTC2h 25m
2026-07-02 CAT9608 - Jul 2, 05:20 UTCJul 2, 16:30 UTC11h 10m
2026-07-01 CAT9644 - Jul 1, 20:25 UTCJul 1, 20:50 UTC25m
2026-07-01 CAT644 - Jul 1, 16:55 UTCJul 1, 19:40 UTC2h 45m
2026-07-01 CAT645 - Jul 1, 12:35 UTCJul 1, 15:30 UTC2h 55m
2026-07-01 CAT646 - Jul 1, 08:45 UTCJul 1, 11:20 UTC2h 35m
2026-07-01 CAT643 - Jul 1, 04:25 UTCJul 1, 07:05 UTC2h 40m
2026-06-30 GRL750 - Jun 30, 11:20 UTCJun 30, 21:30 UTC10h 10m
2026-06-29 CAT756 - Jun 29, 20:35 UTCJun 29, 23:54 UTC3h 20m
2026-06-29 CAT755 - Jun 29, 15:24 UTCJun 29, 19:05 UTC3h 40m
2026-06-29 CAT760 - Jun 29, 08:39 UTCJun 29, 11:35 UTC2h 55m
2026-06-29 CAT759 - Jun 29, 04:14 UTCJun 29, 07:20 UTC3h 5m

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

Mode-S 458664 frequently asked

What is Mode-S code 458664?
458664 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-ASD.
Where is Mode-S 458664 registered?
Mode-S code 458664 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 458664 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 458664, octal 21303144, decimal 4,556,388.
What flights does 458664 operate?
Mode-S 458664 has broadcast 20 distinct callsigns, including CAT754, CAT753, CAT759, CAT745, CAT760.