Apparatus

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sensors Mode-S transponder

458666

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-ASF · BOEING 737-800

Hex
458666
Octal
21303146
Decimal
4,556,390
Country
DK
Tail
OY-ASF
Type
B738
Broadcasting now · callsign CAT757 · 37,000 ft
Flights observed
95
Distinct callsigns
20
Country
DK
Last broadcast
8h ago

Current position

458666 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 458666 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
CAT304 - 5 2026-04-24
CAT9568 - 4 2026-04-25
CAT734 - 4 2026-04-20
CAT568 - 4 2026-04-25
CAT567 - 4 2026-04-23
CAT733 - 3 2026-04-20
CAT731 - 3 2026-04-20
CAT331 - 3 2026-07-12
CAT303 Copenhagen Airtaxi 3 2026-04-17
CAT9303 - 2 2026-04-23
CAT9001 - 2 2026-07-03
CAT750 - 2 2026-07-11
CAT749 - 2 2026-07-11
CAT744 - 2 2026-07-13
CAT743 - 2 2026-07-13
CAT742 - 2 2026-07-13
CAT741 - 2 2026-07-13
CAT732 - 2 2026-04-20
CAT336 - 2 2026-07-11
CAT335 Copenhagen Airtaxi 2 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CAT742 - Jul 13, 17:30 UTCJul 13, 20:15 UTC2h 45m
2026-07-13 CAT743 - Jul 13, 14:00 UTCJul 13, 16:25 UTC2h 25m
2026-07-13 CAT744 - Jul 13, 08:10 UTCJul 13, 10:45 UTC2h 35m
2026-07-13 CAT741 - Jul 13, 04:05 UTCJul 13, 06:30 UTC2h 25m
2026-07-12 CAT334 - Jul 12, 19:01 UTCJul 12, 22:20 UTC3h 20m
2026-07-12 CAT333 - Jul 12, 14:35 UTCJul 12, 17:45 UTC3h 10m
2026-07-12 CAT332 - Jul 12, 09:20 UTCJul 12, 12:35 UTC3h 15m
2026-07-12 CAT331 - Jul 12, 04:30 UTCJul 12, 07:40 UTC3h 10m
2026-07-11 CAT750 ATH → BLL Jul 11, 20:05 UTCJul 11, 23:15 UTC3h 10m
2026-07-11 CAT749 - Jul 11, 15:40 UTCJul 11, 18:30 UTC2h 50m
2026-07-11 CAT336 RHO → BLL Jul 11, 10:45 UTCJul 11, 14:10 UTC3h 25m
2026-07-11 CAT335 BLL → RHO Jul 11, 05:31 UTCJul 11, 08:45 UTC3h 15m
2026-07-10 CAT326 PVK → BLL Jul 10, 17:55 UTCJul 10, 20:45 UTC2h 50m
2026-07-10 CAT325 - Jul 10, 14:05 UTCJul 10, 16:40 UTC2h 35m
2026-07-10 CAT324 - Jul 10, 05:05 UTCJul 10, 12:00 UTC6h 55m
2026-07-09 CAT764 RHO → BLL Jul 9, 19:00 UTCJul 9, 22:45 UTC3h 45m
2026-07-09 CAT763 - Jul 9, 14:30 UTCJul 9, 17:35 UTC3h 5m
2026-07-09 CAT676 - Jul 9, 07:55 UTCJul 9, 10:40 UTC2h 45m
2026-07-09 CAT675 - Jul 9, 04:20 UTCJul 9, 06:35 UTC2h 15m
2026-07-08 CAT684 - Jul 8, 08:55 UTCJul 8, 12:50 UTC3h 55m
2026-07-08 CAT683 - Jul 8, 04:30 UTCJul 8, 07:35 UTC3h 5m
2026-07-07 CAT762 - Jul 7, 13:45 UTCJul 7, 17:45 UTC4h 0m
2026-07-07 CAT761 - Jul 7, 06:50 UTCJul 7, 10:00 UTC3h 10m
2026-07-06 CAT742 - Jul 6, 17:20 UTCJul 6, 20:05 UTC2h 45m
2026-07-06 CAT743 - Jul 6, 13:45 UTCJul 6, 16:05 UTC2h 20m
2026-07-06 CAT744 - Jul 6, 08:15 UTCJul 6, 10:55 UTC2h 40m
2026-07-06 CAT741 - Jul 6, 04:20 UTCJul 6, 06:40 UTC2h 20m
2026-07-05 CAT334 CHQ → BLL Jul 5, 19:10 UTCJul 5, 22:40 UTC3h 30m
2026-07-05 CAT333 - Jul 5, 15:00 UTCJul 5, 18:00 UTC3h 0m
2026-07-05 CAT332 - Jul 5, 09:20 UTCJul 5, 12:50 UTC3h 30m
2026-07-05 CAT331 BLL → CHQ Jul 5, 05:05 UTCJul 5, 08:05 UTC3h 0m
2026-07-04 CAT750 ATH → BLL Jul 4, 20:20 UTCJul 4, 23:40 UTC3h 20m
2026-07-04 CAT749 - Jul 4, 16:10 UTCJul 4, 18:55 UTC2h 45m
2026-07-04 CAT336 RHO → BLL Jul 4, 10:50 UTCJul 4, 14:30 UTC3h 40m
2026-07-04 CAT335 BLL → RHO Jul 4, 05:30 UTCJul 4, 08:35 UTC3h 5m
2026-07-03 CAT326 PVK → BLL Jul 3, 19:25 UTCJul 3, 22:15 UTC2h 50m
2026-07-03 CAT325 - Jul 3, 15:40 UTCJul 3, 17:50 UTC2h 10m
2026-07-03 CAT9001 TLL → BLL Jul 3, 13:10 UTCJul 3, 14:35 UTC1h 25m
2026-05-06 CAT9001 - May 6, 04:55 UTCMay 6, 06:15 UTC1h 20m
2026-05-04 CAT518 - May 4, 16:45 UTCMay 5, 01:00 UTC8h 16m
2026-05-04 CAT9518 RHO → MLA May 4, 09:55 UTCMay 4, 11:55 UTC2h 0m
2026-05-04 CAT771 - May 4, 05:00 UTCMay 4, 08:20 UTC3h 20m
2026-05-03 CAT9512 - May 3, 16:25 UTCMay 3, 16:55 UTC30m
2026-05-03 CAT512 MLA → KRS May 3, 12:10 UTCMay 3, 15:40 UTC3h 30m
2026-05-03 CAT9332 - May 3, 08:40 UTCMay 3, 10:00 UTC1h 20m
2026-05-03 CAT331 BLL → CHQ May 3, 03:55 UTCMay 3, 06:55 UTC3h 0m
2026-05-01 CAT9341 MLA → BLL May 1, 11:45 UTCMay 1, 14:55 UTC3h 10m
2026-05-01 CAT511 KRS → MLA May 1, 07:30 UTCMay 1, 10:40 UTC3h 10m
2026-05-01 CAT9511 - May 1, 05:40 UTCMay 1, 06:15 UTC35m
2026-04-30 CAT9516 MLA → BLL Apr 30, 15:20 UTCApr 30, 18:35 UTC3h 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-ASF page for operator, model, and routing details .

Mode-S 458666 frequently asked

What is Mode-S code 458666?
458666 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-ASF.
Where is Mode-S 458666 registered?
Mode-S code 458666 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 458666 broadcasting right now?
Yes. Mode-S 458666 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 458666, octal 21303146, decimal 4,556,390.
What flights does 458666 operate?
Mode-S 458666 has broadcast 20 distinct callsigns, including CAT304, CAT9568, CAT734, CAT568, CAT567.