Apparatus

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sensors Mode-S transponder

45B4EF

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-MGO · DASSAULT Falcon 2000

Hex
45B4EF
Octal
21332357
Decimal
4,568,303
Country
DK
Tail
OY-MGO
Type
F2TH
No current signal · last broadcast 5d ago
Flights observed
47
Distinct callsigns
14
Country
DK
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S 45B4EF.

Country allocation

The ICAO 24-bit address 45B4EF 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 14 distinct

Callsign Airline Flights Last seen
MMD6811 Air Alsie 6 2026-04-30
MMD6789 Air Alsie 6 2026-04-15
MMD6771 Air Alsie 6 2026-05-04
MMD1123 Air Alsie 4 2026-05-17
MMD6865 Air Alsie 3 2026-05-22
MMD6848 Air Alsie 3 2026-05-13
MMD6838 Air Alsie 3 2026-05-07
MMD6791 Air Alsie 3 2026-04-16
MMD6675 Air Alsie 3 2026-05-21
MMD1121 Air Alsie 3 2026-05-08
MMD6821 Air Alsie 2 2026-05-10
MMD6798 Air Alsie 2 2026-04-26
MMD1126 - 2 2026-04-21
MMD1096 Air Alsie 1 2026-05-24

Recent flights last 47

DateFlightRouteTakeoffLandingDuration
2026-05-24 MMD1096 CPH → AGP May 24, 08:40 UTCMay 24, 11:50 UTC3h 10m
2026-05-22 MMD6865 VIE → OPO May 22, 14:55 UTCMay 22, 15:50 UTC55m
2026-05-22 MMD6865 VIE → OPO May 22, 12:35 UTCMay 22, 14:35 UTC2h 0m
2026-05-22 MMD6865 VIE → OPO May 22, 09:20 UTCMay 22, 10:45 UTC1h 25m
2026-05-21 MMD6675 CGN → LTN May 21, 17:35 UTCMay 21, 18:20 UTC45m
2026-05-21 MMD6675 CGN → LTN May 21, 13:10 UTCMay 21, 17:00 UTC3h 50m
2026-05-18 MMD6675 CGN → LTN May 18, 07:55 UTCMay 18, 11:40 UTC3h 45m
2026-05-17 MMD1123 CPH → MAD May 17, 13:20 UTCMay 17, 14:10 UTC50m
2026-05-17 MMD1123 CPH → MAD May 17, 09:10 UTCMay 17, 12:20 UTC3h 10m
2026-05-14 MMD1123 CPH → MAD May 14, 10:40 UTCMay 14, 11:25 UTC45m
2026-05-13 MMD6848 CIW → LBG May 13, 19:00 UTCMay 13, 19:55 UTC55m
2026-05-13 MMD6848 CIW → LBG May 13, 15:35 UTCMay 13, 17:15 UTC1h 40m
2026-05-12 MMD6848 CIW → LBG May 12, 12:20 UTCMay 12, 14:25 UTC2h 5m
2026-05-12 MMD1123 CPH → MAD May 12, 07:50 UTCMay 12, 10:50 UTC3h 0m
2026-05-10 MMD6821 GYD → LTN May 10, 11:45 UTCMay 10, 12:40 UTC55m
2026-05-10 MMD6821 GYD → LTN May 10, 09:40 UTCMay 10, 10:24 UTC45m
2026-05-08 MMD1121 CPH → EMA May 8, 17:00 UTCMay 8, 17:50 UTC50m
2026-05-08 MMD1121 CPH → EMA May 8, 14:40 UTCMay 8, 16:35 UTC1h 55m
2026-05-08 MMD1121 CPH → EMA May 8, 07:04 UTCMay 8, 08:40 UTC1h 35m
2026-05-07 MMD6838 BOD → SGD May 7, 14:00 UTCMay 7, 17:00 UTC3h 0m
2026-05-07 MMD6838 BOD → SGD May 7, 06:20 UTCMay 7, 08:05 UTC1h 45m
2026-05-06 MMD6838 BOD → SGD May 6, 15:05 UTCMay 6, 16:45 UTC1h 40m
2026-05-04 MMD6771 TEB → FAB May 4, 19:35 UTCMay 4, 20:25 UTC50m
2026-05-04 MMD6771 TEB → FAB May 4, 14:30 UTCMay 4, 19:30 UTC5h 1m
2026-05-04 MMD6771 TEB → FAB May 4, 13:20 UTCMay 4, 13:35 UTC15m
2026-05-03 MMD6771 TEB → FAB May 3, 12:45 UTCMay 3, 13:05 UTC20m
2026-05-03 MMD6771 TEB → FAB May 3, 07:25 UTCMay 3, 11:25 UTC4h 0m
2026-05-03 MMD6771 TEB → FAB May 3, 05:05 UTCMay 3, 05:55 UTC50m
2026-04-30 MMD6811 CPH → GVA Apr 30, 16:25 UTCApr 30, 17:50 UTC1h 25m
2026-04-30 MMD6811 CPH → GVA Apr 30, 13:40 UTCApr 30, 15:50 UTC2h 10m
2026-04-29 MMD6811 CPH → GVA Apr 29, 18:20 UTCApr 29, 19:55 UTC1h 35m
2026-04-28 MMD6811 CPH → GVA Apr 28, 15:25 UTCApr 28, 16:55 UTC1h 30m
2026-04-27 MMD6811 CPH → GVA Apr 27, 07:50 UTCApr 27, 09:15 UTC1h 25m
2026-04-27 MMD6811 CPH → GVA Apr 27, 04:45 UTCApr 27, 06:25 UTC1h 40m
2026-04-26 MMD6798 BLL → INN Apr 26, 15:15 UTCApr 26, 17:10 UTC1h 55m
2026-04-23 MMD6798 BLL → INN Apr 23, 08:40 UTCApr 23, 10:50 UTC2h 10m
2026-04-21 MMD1126 - Apr 21, 09:30 UTCApr 21, 11:40 UTC2h 10m
2026-04-20 MMD1126 - Apr 20, 06:55 UTCApr 20, 09:05 UTC2h 10m
2026-04-16 MMD6791 LUX → ARN Apr 16, 07:54 UTCApr 16, 08:15 UTC20m
2026-04-16 MMD6791 LUX → ARN Apr 16, 07:09 UTCApr 16, 07:24 UTC15m
2026-04-16 MMD6791 LUX → ARN Apr 16, 06:25 UTCApr 16, 07:05 UTC40m
2026-04-15 MMD6789 CPH → NCE Apr 15, 15:05 UTCApr 15, 15:30 UTC25m
2026-04-15 MMD6789 CPH → NCE Apr 15, 14:30 UTCApr 15, 14:55 UTC24m
2026-04-14 MMD6789 CPH → NCE Apr 14, 15:25 UTCApr 14, 16:20 UTC55m
2026-04-14 MMD6789 CPH → NCE Apr 14, 10:50 UTCApr 14, 11:25 UTC35m
2026-04-14 MMD6789 CPH → NCE Apr 14, 10:35 UTCApr 14, 11:05 UTC30m
2026-04-14 MMD6789 CPH → NCE Apr 14, 08:05 UTCApr 14, 08:35 UTC30m

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

Mode-S 45B4EF frequently asked

What is Mode-S code 45B4EF?
45B4EF is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-MGO.
Where is Mode-S 45B4EF registered?
Mode-S code 45B4EF is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45B4EF broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45B4EF, octal 21332357, decimal 4,568,303.
What flights does 45B4EF operate?
Mode-S 45B4EF has broadcast 14 distinct callsigns, including MMD6811, MMD6789, MMD6771, MMD1123, MMD6865.