Apparatus

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sensors Mode-S transponder

45A1B0

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-HMP · AGUSTA AW-189

Hex
45A1B0
Octal
21320660
Decimal
4,563,376
Country
DK
Tail
OY-HMP
Type
A189
No current signal · last broadcast 6h ago
Flights observed
192
Distinct callsigns
20
Country
DK
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 45A1B0.

Country allocation

The ICAO 24-bit address 45A1B0 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
BBX51A - 25 2026-06-26
BBX616 - 18 2026-07-22
BBX615 - 18 2026-07-22
BBX603 - 18 2026-07-21
BBX609 - 17 2026-07-21
BBX604 - 17 2026-07-21
BBX610 - 14 2026-07-21
BBX101 - 10 2026-07-19
LEON100 - 7 2026-05-21
OYHMP - 6 2026-06-17
LEO100 - 6 2026-05-27
BBX55A - 6 2026-06-22
BBX606 - 2 2026-06-08
BBX605 - 2 2026-06-08
BBX55B - 2 2026-06-04
BBX52A - 2 2026-06-22
BBX51B - 2 2026-05-25
BBX401 - 2 2026-07-16
BBX2610 - 2 2026-07-12
BBX2609 - 2 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 BBX616 - Jul 22, 14:35 UTCJul 22, 14:55 UTC20m
2026-07-22 BBX615 - Jul 22, 12:45 UTCJul 22, 13:25 UTC40m
2026-07-21 BBX616 - Jul 21, 14:35 UTCJul 21, 15:00 UTC25m
2026-07-21 BBX615 - Jul 21, 12:45 UTCJul 21, 13:20 UTC35m
2026-07-21 BBX610 - Jul 21, 11:10 UTCJul 21, 11:35 UTC25m
2026-07-21 BBX609 - Jul 21, 09:20 UTCJul 21, 09:55 UTC35m
2026-07-21 BBX604 - Jul 21, 07:20 UTCJul 21, 08:10 UTC50m
2026-07-21 BBX603 - Jul 21, 06:00 UTCJul 21, 06:35 UTC35m
2026-07-20 BBX616 - Jul 20, 14:40 UTCJul 20, 15:00 UTC20m
2026-07-20 BBX615 - Jul 20, 12:55 UTCJul 20, 13:25 UTC30m
2026-07-20 BBX610 - Jul 20, 11:50 UTCJul 20, 12:10 UTC20m
2026-07-20 BBX609 - Jul 20, 09:45 UTCJul 20, 10:20 UTC35m
2026-07-20 BBX604 - Jul 20, 08:25 UTCJul 20, 08:50 UTC25m
2026-07-20 BBX603 - Jul 20, 06:00 UTCJul 20, 06:30 UTC30m
2026-07-19 BBX101 - Jul 19, 12:30 UTCJul 19, 12:40 UTC10m
2026-07-17 BBX616 - Jul 17, 16:34 UTCJul 17, 16:49 UTC15m
2026-07-17 BBX615 - Jul 17, 14:30 UTCJul 17, 14:55 UTC25m
2026-07-17 BBX610 - Jul 17, 12:50 UTCJul 17, 13:20 UTC30m
2026-07-17 BBX609 - Jul 17, 10:35 UTCJul 17, 10:44 UTC10m
2026-07-17 BBX604 - Jul 17, 09:35 UTCJul 17, 09:50 UTC15m
2026-07-17 BBX603 - Jul 17, 07:25 UTCJul 17, 07:44 UTC20m
2026-07-16 BBX616 - Jul 16, 14:25 UTCJul 16, 14:35 UTC10m
2026-07-16 BBX615 - Jul 16, 13:05 UTCJul 16, 13:45 UTC40m
2026-07-16 BBX610 - Jul 16, 11:34 UTCJul 16, 11:54 UTC20m
2026-07-16 BBX609 - Jul 16, 09:35 UTCJul 16, 10:50 UTC1h 15m
2026-07-16 BBX604 - Jul 16, 08:35 UTCJul 16, 09:00 UTC25m
2026-07-16 BBX603 - Jul 16, 06:45 UTCJul 16, 08:00 UTC1h 15m
2026-07-16 BBX402 - Jul 16, 05:25 UTCJul 16, 05:55 UTC30m
2026-07-16 BBX401 - Jul 16, 04:35 UTCJul 16, 05:10 UTC35m
2026-07-15 BBX616 - Jul 15, 14:10 UTCJul 15, 15:10 UTC1h 0m
2026-07-15 BBX615 - Jul 15, 13:00 UTCJul 15, 14:00 UTC1h 0m
2026-07-15 BBX610 - Jul 15, 10:40 UTCJul 15, 11:40 UTC1h 0m
2026-07-15 BBX609 - Jul 15, 09:35 UTCJul 15, 10:30 UTC55m
2026-07-15 BBX604 - Jul 15, 08:25 UTCJul 15, 08:50 UTC25m
2026-07-15 BBX603A - Jul 15, 07:05 UTCJul 15, 07:40 UTC35m
2026-07-15 BBX603 - Jul 15, 05:55 UTCJul 15, 07:00 UTC1h 5m
2026-07-14 BBX609 - Jul 14, 09:20 UTCJul 14, 11:50 UTC2h 30m
2026-07-14 BBX604 - Jul 14, 06:00 UTCJul 14, 07:55 UTC1h 55m
2026-07-13 BBX616 - Jul 13, 14:10 UTCJul 13, 15:00 UTC50m
2026-07-13 BBX615 - Jul 13, 12:45 UTCJul 13, 13:25 UTC40m
2026-07-13 BBX609 - Jul 13, 09:20 UTCJul 13, 11:20 UTC2h 0m
2026-07-13 BBX603 - Jul 13, 05:50 UTCJul 13, 08:10 UTC2h 20m
2026-07-12 BBX2610 - Jul 12, 07:20 UTCJul 12, 08:20 UTC1h 0m
2026-07-12 BBX2609 - Jul 12, 06:05 UTCJul 12, 07:10 UTC1h 5m
2026-07-11 BBX1604 - Jul 11, 14:20 UTCJul 11, 15:10 UTC50m
2026-07-11 BBX1603 - Jul 11, 12:50 UTCJul 11, 13:40 UTC50m
2026-07-11 BBX2616 - Jul 11, 10:35 UTCJul 11, 11:20 UTC45m
2026-07-11 BBX2615 - Jul 11, 09:25 UTCJul 11, 10:05 UTC40m
2026-07-11 BBX2610 - Jul 11, 08:10 UTCJul 11, 08:35 UTC25m
2026-07-11 BBX2609 - Jul 11, 06:05 UTCJul 11, 06:50 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-HMP page for operator, model, and routing details .

Mode-S 45A1B0 frequently asked

What is Mode-S code 45A1B0?
45A1B0 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-HMP.
Where is Mode-S 45A1B0 registered?
Mode-S code 45A1B0 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45A1B0 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45A1B0, octal 21320660, decimal 4,563,376.
What flights does 45A1B0 operate?
Mode-S 45A1B0 has broadcast 20 distinct callsigns, including BBX51A, BBX616, BBX615, BBX603, BBX609.